{
	"id": "7c5ec864-d640-4fa3-b992-b886df196079",
	"created_at": "2026-04-06T00:06:50.965724Z",
	"updated_at": "2026-04-10T03:21:53.318322Z",
	"deleted_at": null,
	"sha1_hash": "badd87edd00ec9a7afdead78f6827124a2c02fa0",
	"title": ".harma (Ouroboros) Ransomware",
	"llm_title": "",
	"authors": "",
	"file_creation_date": "0001-01-01T00:00:00Z",
	"file_modification_date": "0001-01-01T00:00:00Z",
	"file_size": 4434484,
	"plain_text": ".harma (Ouroboros) Ransomware\r\nBy Tomas Meskauskas\r\nPublished: 2021-09-16 · Archived: 2026-04-05 23:22:53 UTC\r\nWhat is .harma (Ouroboros)?\r\nDiscovered by malware researcher S!Ri, .harma (Ouroboros) is a ransomware-type malicious program belonging\r\nto the Ouroboros malware family. Systems infected with this software have data encrypted and victims receive\r\nransom demands for decryption tools/software.\r\nDuring the encryption process, all affected files are renamed with the \".harma\" extension, which has been used by\r\nother ransomware from the Dharma family.\r\nTo elaborate on how files appear following encryption, a filename like \"1.jpg\" would appear as \"1.jpg.harma\".\r\nAfter this process is complete, two files (\"INFO.exe\" and \"ReadMe.txt\") containing the ransom messages are\r\nstored on the desktop.\r\nThe text file informs victims that their data has been encrypted. To restore files, users are instructed to establish\r\ncontact with the ransomware developers via the email addresses provided. The subject line of their messages must\r\ninclude their unique IDs and personal keys.\r\nThe pop-up window (opened by \"INFO.exe\") is a more detailed ransom message, which repeats the information\r\nwithin \"ReadMe.txt\" and adds that victims can test decryption by sending one encrypted file to the cyber criminals\r\nbehind .harma (Ouroboros).\r\nThis test file cannot exceed 1 MB or contain valuable information (e.g. databases, backups, large excel sheets or\r\nsimilar). The ransom size is not stated, however, it must be paid in the Bitcoin cryptocurrency. This message also\r\nlists links to websites detailing how to and from where to acquire Bitcoins.\r\nIt warns users that renaming the compromised files and attempting decryption with third party software can lead\r\nto permanent data loss. Unfortunately, in most cases of ransomware infections, decryption is impossible without\r\nthe involvement of the criminals responsible, unless the malware is still in development and/or has bugs/flaws.\r\nWhatever the case, you are strongly advised against meeting the ransom demands of cyber criminals. Despite\r\npaying, victims often receive none of the promised decryption tools/software. Therefore, their files remain\r\nencrypted and they also experience significant financial loss.\r\nTo prevent .harma (Ouroboros) ransomware from further encryption, it must be removed from the operating\r\nsystem, however, removal will not restore already affected data. The only solution is to recover files from a\r\nbackup, if one was created prior to the infection and was stored in a different location.\r\nScreenshot of a message encouraging users to pay a ransom to decrypt their compromised data:\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 1 of 29\n\nRagnarok, Devos, and Nosu are some examples of other ransomware infections. These malicious programs are\r\ndesigned to encrypt data and demand payment for decryption. Main differences include the cryptographic\r\nalgorithm used (symmetric or asymmetric) for encryption and ransom size.\r\nThe latter typically ranges between three and four digit sums (in USD). Digital currencies (mainly\r\ncryptocurrencies) are preferred by cyber criminals, since these transactions are difficult/impossible to trace. To\r\nensure data safety, you are advised to keep backups on remote servers and/or unplugged storage devices.\r\nHow did ransomware infect my computer?\r\nRansomware and malware are primarily spread through trojans, spam campaigns, illegal activation tools\r\n(\"cracks\"), fake updaters and untrusted download sources. Trojans are malware programs designed to cause chain\r\ninfections (i.e. download/install additional malicious programs).\r\nSpam campaigns are used to send deceptive emails on a mass scale. The mail is usually disguised as \"official\",\r\n\"urgent\", \"important\" and so on. The messages have infectious files attached (or contain links leading to them).\r\nThe attachments come in various formats (e.g. archive and executable files, PDF and Microsoft Office documents,\r\nJavaScript, etc.).\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 2 of 29\n\nWhen they are opened, the infection process starts. Software \"cracking\" (activation) tools can download/install\r\nmalware.\r\nFake updaters infect systems by misusing weaknesses in outdated programs or simply by installing malware rather\r\nthan the updates. Untrustworthy download sources (e.g. unofficial and free file-hosting websites, Peer-to-Peer\r\nsharing networks and other third party downloaders) can offer malicious content presented as normal software\r\nand/or bundled with it.\r\nThreat Summary:\r\nName .harma (Ouroboros) virus\r\nThreat Type Ransomware, Crypto Virus, Files locker.\r\nEncrypted\r\nFiles\r\nExtension\r\n.harma\r\nRansom\r\nDemand\r\nMessage\r\nINFO.exe and ReadMe.txt\r\nCyber\r\nCriminal\r\nContact\r\nencryptor2020@protonmail.com and encryptor1996@protonmail.com\r\nDetection\r\nNames\r\nFortinet (MSIL/Kryptik.QBJ!tr), McAfee (Artemis!01816325E9CB), ESET-NOD32 (A\r\nVariant Of MSIL/Kryptik.QBJ), Kaspersky (Trojan.Win32.DelShad.cgn), Full List Of\r\nDetections (VirusTotal)\r\nSymptoms\r\nCannot open files stored on your computer, previously functional files now have a\r\ndifferent extension (for example, my.docx.locked). A ransom demand message is\r\ndisplayed on your desktop. Cyber criminals demand payment of a ransom (usually in\r\nbitcoins) to unlock your files.\r\nAdditional\r\nInformation\r\nThe added extension (.harma) has been used by ransomware from the Dharma malware\r\nfamily.\r\nDistribution\r\nmethods\r\nInfected email attachments (macros), torrent websites, malicious ads.\r\nDamage\r\nAll files are encrypted and cannot be opened without paying a ransom. Additional\r\npassword-stealing trojans and malware infections can be installed together with a\r\nransomware infection.\r\nMalware\r\nRemoval\r\n(Windows)\r\nTo eliminate possible malware infections, scan your computer with legitimate antivirus\r\nsoftware. Our security researchers recommend using Combo Cleaner.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 3 of 29\n\nDownload Combo Cleaner\r\nTo use full-featured product, you have to purchase a license for Combo Cleaner. 7 days\r\nfree trial available. Combo Cleaner is owned and operated by RCS LT, the parent company\r\nof PCRisk.com.\r\nHow to protect yourself from ransomware infections\r\nSuspicious and/or irrelevant emails should not be opened, especially those received from unknown addresses. Any\r\nattachments or links found in dubious mail must never be opened, since doing so can trigger an infection. Use\r\nofficial and verified download channels.\r\nAll programs should be activated and updated with tools/functions provided by legitimate developers. Illegal\r\nactivation tools (\"cracks\") and third party updaters carry a high risk of malware installation and should not be\r\nused. Have a reputable anti-virus/anti-spyware suite installed and kept updated.\r\nThis software should be used for regular system scans and removal of detected/potential threats. If your computer\r\nis already infected with .harma (Ouroboros), we recommend running a scan with Combo Cleaner Antivirus for\r\nWindows to automatically eliminate this ransomware.\r\nText presented in .harma (Ouroboros) ransomware pop-up (\"INFO.exe\"):\r\nYour Files Has Been Encrypted\r\nHow To Recover :\r\nYour Data Has Been Encrypted Due The Security Problem\r\nIf You Want To Restore Your Files Send Email to Us\r\nBefore Paying You Can Send 1MB file For Decryption Test to guarantee that your Files Can Be\r\nRestored\r\nTest File Should Not Contain Valuable Data ( Databases Large Excels , Backups )\r\nDo Not Rename Files or Do Not Try Decrypt Files With 3rd Party Softwares , It May Damage Your\r\nFiles\r\nAnd Increase Decryption Price\r\nYour ID : 1E857D00\r\nOur Email :  encryptor2020@protonmail.com Or encryptor1996@protonmail.com\r\nHow To Buy Bitcoin :\r\nPayment Should Be With Bitcoin\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 4 of 29\n\nYou Can learn how To Buy Bitcoin From This Links :\r\nhxxps://localbitcoins.com/buy_bitcoins\r\nhxxps://www.coindesk.com/information/how-can-i-buy-bitcoins\r\nScreenshot of .harma (Ouroboros) text file (\"ReadMe.txt\"):\r\nText presented in this file:\r\n[+] All Your Files Have Been Encrypted [+]\r\n [-] Do You Really Want To Restore Your Files?\r\n [+] Write Us To The E-Mail : encryptor1996@protonmail.com\r\n [+] If you did not get any response until 24 hours later,Write to this E-Mail :\r\nencryptor2020@protonmail.com\r\n [-] Write Your Unique-ID In The Title Of Your Message.\r\n [+] Unique-ID : 1E857D00\r\n [+] Personal Key:\r\n [+] Please send this to our email\r\n [+] Your Personal KEY: -\r\nScreenshot of files encrypted by .harma (Ouroboros) (\".harma\" extension):\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 5 of 29\n\n.harma (Ouroboros) ransomware removal:\r\nInstant automatic malware removal:\r\nManual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo\r\nCleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it\r\nby clicking the button below:\r\n DOWNLOAD Combo Cleaner\r\nBy downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use\r\nfull-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo\r\nCleaner is owned and operated by RCS LT, the parent company of PCRisk.com.\r\nVideo suggesting what steps should be taken in case of a ransomware infection:\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 6 of 29\n\nEtt fel inträffade.\r\nDet går inte att köra JavaScript.\r\nQuick menu:\r\nWhat is .harma (Ouroboros) virus?\r\nSTEP 1. Reporting ransomware to authorities.\r\nSTEP 2. Isolating the infected device.\r\nSTEP 3. Identifying the ransomware infection.\r\nSTEP 4. Searching for ransomware decryption tools.\r\nSTEP 5. Restoring files with data recovery tools.\r\nSTEP 6. Creating data backups.\r\nReporting ransomware to authorities:\r\nIf you are a victim of a ransomware attack we recommend reporting this incident to authorities. By providing\r\ninformation to law enforcement agencies you will help track cybercrime and potentially assist in the prosecution\r\nof the attackers. Here's a list of authorities where you should report a ransomware attack. For the complete list of\r\nlocal cybersecurity centers and information on why you should report ransomware attacks, read this article.\r\nList of local authorities where ransomware attacks should be reported (choose one depending on your residence\r\naddress):\r\nIsolating the infected device:\r\nSome ransomware-type infections are designed to encrypt files within external storage devices, infect them, and\r\neven spread throughout the entire local network. For this reason, it is very important to isolate the infected device\r\n(computer) as soon as possible.\r\nStep 1: Disconnect from the internet.\r\nThe easiest way to disconnect a computer from the internet is to unplug the Ethernet cable from the motherboard,\r\nhowever, some devices are connected via a wireless network and for some users (especially those who are not\r\nparticularly tech-savvy), disconnecting cables may seem troublesome. Therefore, you can also disconnect the\r\nsystem manually via Control Panel:\r\nNavigate to the \"Control Panel\", click the search bar in the upper-right corner of the screen, enter \"Network and\r\nSharing Center\" and select search result:\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 7 of 29\n\nClick the \"Change adapter settings\" option in the upper-left corner of the window:\r\nRight-click on each connection point and select \"Disable\". Once disabled, the system will no longer be connected\r\nto the internet. To re-enable the connection points, simply right-click again and select \"Enable\".\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 8 of 29\n\nStep 2: Unplug all storage devices.\r\nAs mentioned above, ransomware might encrypt data and infiltrate all storage devices that are connected to the\r\ncomputer. For this reason, all external storage devices (flash drives, portable hard drives, etc.) should be\r\ndisconnected immediately, however, we strongly advise you to eject each device before disconnecting to prevent\r\ndata corruption:\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 9 of 29\n\nNavigate to \"My Computer\", right-click on each connected device, and select \"Eject\":\r\nStep 3: Log-out of cloud storage accounts.\r\nSome ransomware-type might be able to hijack software that handles data stored within \"the Cloud\". Therefore,\r\nthe data could be corrupted/encrypted. For this reason, you should log-out of all cloud storage accounts within\r\nbrowsers and other related software. You should also consider temporarily uninstalling the cloud-management\r\nsoftware until the infection is completely removed.\r\nIdentify the ransomware infection:\r\nTo properly handle an infection, one must first identify it. Some ransomware infections use ransom-demand\r\nmessages as an introduction (see the WALDO ransomware text file below).\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 10 of 29\n\nThis, however, is rare. In most cases, ransomware infections deliver more direct messages simply stating that data\r\nis encrypted and that victims must pay some sort of ransom. Note that ransomware-type infections typically\r\ngenerate messages with different file names (for example, \"_readme.txt\", \"READ-ME.txt\",\r\n\"DECRYPTION_INSTRUCTIONS.txt\", \"DECRYPT_FILES.html\", etc.). Therefore, using the name of a\r\nransom message may seem like a good way to identify the infection. The problem is that most of these names are\r\ngeneric and some infections use the same names, even though the delivered messages are different and the\r\ninfections themselves are unrelated. Therefore, using the message filename alone can be ineffective and even lead\r\nto permanent data loss (for example, by attempting to decrypt data using tools designed for different ransomware\r\ninfections, users are likely to end up permanently damaging files and decryption will no longer be possible even\r\nwith the correct tool).\r\nAnother way to identify a ransomware infection is to check the file extension, which is appended to each\r\nencrypted file. Ransomware infections are often named by the extensions they append (see files encrypted by\r\nQewe ransomware below).\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 11 of 29\n\nThis method is only effective, however, when the appended extension is unique - many ransomware infections\r\nappend a generic extension (for example, \".encrypted\", \".enc\", \".crypted\", \".locked\", etc.). In these cases,\r\nidentifying ransomware by its appended extension becomes impossible.\r\nOne of the easiest and quickest ways to identify a ransomware infection is to use the ID Ransomware website.\r\nThis service supports most existing ransomware infections. Victims simply upload a ransom message and/or one\r\nencrypted file (we advise you to upload both if possible).\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 12 of 29\n\nThe ransomware will be identified within seconds and you will be provided with various details, such as the name\r\nof the malware family to which the infection belongs, whether it is decryptable, and so on.\r\nExample 1 (Qewe [Stop/Djvu] ransomware):\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 13 of 29\n\nExample 2 (.iso [Phobos] ransomware):\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 14 of 29\n\nIf your data happens to be encrypted by ransomware that is not supported by ID Ransomware, you can always try\r\nsearching the internet by using certain keywords (for example, a ransom message title, file extension, provided\r\ncontact emails, crypto wallet addresses, etc.).\r\nSearch for ransomware decryption tools:\r\nEncryption algorithms used by most ransomware-type infections are extremely sophisticated and, if the encryption\r\nis performed properly, only the developer is capable of restoring data. This is because decryption requires a\r\nspecific key, which is generated during the encryption. Restoring data without the key is impossible. In most\r\ncases, cybercriminals store keys on a remote server, rather than using the infected machine as a host. Dharma\r\n(CrySis), Phobos, and other families of high-end ransomware infections are virtually flawless, and thus restoring\r\ndata encrypted without the developers' involvement is simply impossible. Despite this, there are dozens of\r\nransomware-type infections that are poorly developed and contain a number of flaws (for example, the use of\r\nidentical encryption/decryption keys for each victim, keys stored locally, etc.). Therefore, always check for\r\navailable decryption tools for any ransomware that infiltrates your computer.\r\nFinding the correct decryption tool on the internet can be very frustrating. For this reason, we recommend that you\r\nuse the No More Ransom Project and this is where identifying the ransomware infection is useful. The No More\r\nRansom Project website contains a \"Decryption Tools\" section with a search bar. Enter the name of the identified\r\nransomware, and all available decryptors (if there are any) will be listed.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 15 of 29\n\nRestore files with data recovery tools:\r\nDepending on the situation (quality of ransomware infection, type of encryption algorithm used, etc.), restoring\r\ndata with certain third-party tools might be possible. Therefore, we advise you to use the Recuva tool developed\r\nby CCleaner. This tool supports over a thousand data types (graphics, video, audio, documents, etc.) and it is very\r\nintuitive (little knowledge is necessary to recover data). In addition, the recovery feature is completely free.\r\nStep 1: Perform a scan.\r\nRun the Recuva application and follow the wizard. You will be prompted with several windows allowing you to\r\nchoose what file types to look for, which locations should be scanned, etc. All you need to do is select the options\r\nyou're looking for and start the scan. We advise you to enable the \"Deep Scan\" before starting, otherwise, the\r\napplication's scanning capabilities will be restricted.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 16 of 29\n\nWait for Recuva to complete the scan. The scanning duration depends on the volume of files (both in quantity and\r\nsize) that you are scanning (for example, several hundred gigabytes could take over an hour to scan). Therefore,\r\nbe patient during the scanning process. We also advise against modifying or deleting existing files, since this\r\nmight interfere with the scan. If you add additional data (for example, downloading files/content) while scanning,\r\nthis will prolong the process:\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 17 of 29\n\nStep 2: Recover data.\r\nOnce the process is complete, select the folders/files you wish to restore and simply click \"Recover\". Note that\r\nsome free space on your storage drive is necessary to restore data:\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 18 of 29\n\nCreate data backups:\r\nProper file management and creating backups is essential for data security. Therefore, always be very careful and\r\nthink ahead.\r\nPartition management: We recommend that you store your data in multiple partitions and avoid storing\r\nimportant files within the partition that contains the entire operating system. If you fall into a situation whereby\r\nyou cannot boot the system and are forced to format the disk on which the operating system is installed (in most\r\ncases, this is where malware infections hide), you will lose all data stored within that drive. This is the advantage\r\nof having multiple partitions: if you have the entire storage device assigned to a single partition, you will be\r\nforced to delete everything, however, creating multiple partitions and allocating the data properly allows you to\r\nprevent such problems. You can easily format a single partition without affecting the others - therefore, one will be\r\ncleaned and the others will remain untouched, and your data will be saved. Managing partitions is quite simple\r\nand you can find all the necessary information on Microsoft's documentation web page.\r\nData backups: One of the most reliable backup methods is to use an external storage device and keep it\r\nunplugged. Copy your data to an external hard drive, flash (thumb) drive, SSD, HDD, or any other storage device,\r\nunplug it and store it in a dry place away from the sun and extreme temperatures. This method is, however, quite\r\ninefficient, since data backups and updates need to be made regularly. You can also use a cloud service or remote\r\nserver. Here, an internet connection is required and there is always the chance of a security breach, although it's a\r\nreally rare occasion.\r\nWe recommend using Microsoft OneDrive for backing up your files. OneDrive lets you store your personal files\r\nand data in the cloud, sync files across computers and mobile devices, allowing you to access and edit your files\r\nfrom all of your Windows devices. OneDrive lets you save, share and preview files, access download history,\r\nmove, delete, and rename files, as well as create new folders, and much more.\r\nYou can back up your most important folders and files on your PC (your Desktop, Documents, and Pictures\r\nfolders). Some of OneDrive’s more notable features include file versioning, which keeps older versions of files for\r\nup to 30 days. OneDrive features a recycling bin in which all of your deleted files are stored for a limited time.\r\nDeleted files are not counted as part of the user’s allocation.\r\nThe service is built using HTML5 technologies and allows you to upload files up to 300 MB via drag and drop\r\ninto the web browser or up to 10 GB via the OneDrive desktop application. With OneDrive, you can download\r\nentire folders as a single ZIP file with up to 10,000 files, although it can’t exceed 15 GB per single download.\r\nOneDrive comes with 5 GB of free storage out of the box, with an additional 100 GB, 1 TB, and 6 TB storage\r\noptions available for a subscription-based fee. You can get one of these storage plans by either purchasing\r\nadditional storage separately or with Office 365 subscription.\r\nCreating a data backup:\r\nThe backup process is the same for all file types and folders. Here’s how you can back up your files using\r\nMicrosoft OneDrive\r\nStep 1: Choose the files/folders you want to backup.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 19 of 29\n\nClick the OneDrive cloud icon to open the OneDrive menu. While in this menu, you can customize your file\r\nbackup settings.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 20 of 29\n\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 21 of 29\n\nClick Help \u0026 Settings and then select Settings from the drop-down menu.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 22 of 29\n\nGo to the Backup tab and click Manage backup.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 23 of 29\n\nIn this menu, you can choose to backup the Desktop and all of the files on it, and Documents and Pictures\r\nfolders, again, with all of the files in them. Click Start backup.\r\nNow, when you add a file or folder in the Desktop and Documents and Pictures folders, they will be automatically\r\nbacked up on OneDrive.\r\nTo add folders and files, not in the locations shown above, you have to add them manually.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 24 of 29\n\nOpen File Explorer and navigate to the location of the folder/file you want to backup. Select the item, right-click it, and click Copy.\r\nThen, navigate to OneDrive, right-click anywhere in the window and click Paste. Alternatively, you can just\r\ndrag and drop a file into OneDrive. OneDrive will automatically create a backup of the folder/file.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 25 of 29\n\nAll of the files added to the OneDrive folder are backed up in the cloud automatically. The green circle with the\r\ncheckmark in it indicates that the file is available both locally and on OneDrive and that the file version is the\r\nsame on both. The blue cloud icon indicates that the file has not been synced and is available only on OneDrive.\r\nThe sync icon indicates that the file is currently syncing.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 26 of 29\n\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 27 of 29\n\nTo access files only located on OneDrive online, go to the Help \u0026 Settings drop-down menu and select View\r\nonline.\r\nStep 2: Restore corrupted files.\r\nOneDrive makes sure that the files stay in sync, so the version of the file on the computer is the same version on\r\nthe cloud. However, if ransomware has encrypted your files, you can take advantage of OneDrive’s Version\r\nhistory feature that will allow you to restore the file versions prior to encryption.\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 28 of 29\n\nMicrosoft 365 has a ransomware detection feature that notifies you when your OneDrive files have been attacked\r\nand guide you through the process of restoring your files. It must be noted, however, that if you don’t have a paid\r\nMicrosoft 365 subscription, you only get one detection and file recovery for free.\r\nIf your OneDrive files get deleted, corrupted, or infected by malware, you can restore your entire OneDrive to a\r\nprevious state. Here’s how you can restore your entire OneDrive:\r\n1. If you're signed in with a personal account, click the Settings cog at the top of the page. Then, click Options\r\nand select Restore your OneDrive.\r\nIf you're signed in with a work or school account,  click the Settings cog at the top of the page. Then, click\r\nRestore your OneDrive.\r\n2. On the Restore your OneDrive page, select a date from the drop-down list. Note that if you're restoring your\r\nfiles after automatic ransomware detection, a restore date will be selected for you.\r\n3. After configuring all of the file restoration options, click Restore to undo all the activities you selected.\r\nThe best way to avoid damage from ransomware infections is to maintain regular up-to-date backups.\r\nSource: https://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nhttps://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware\r\nPage 29 of 29",
	"extraction_quality": 1,
	"language": "EN",
	"sources": [
		"Malpedia"
	],
	"references": [
		"https://www.pcrisk.com/removal-guides/16844-harma-ouroboros-ransomware"
	],
	"report_names": [
		"16844-harma-ouroboros-ransomware"
	],
	"threat_actors": [
		{
			"id": "d90307b6-14a9-4d0b-9156-89e453d6eb13",
			"created_at": "2022-10-25T16:07:23.773944Z",
			"updated_at": "2026-04-10T02:00:04.746188Z",
			"deleted_at": null,
			"main_name": "Lead",
			"aliases": [
				"Casper",
				"TG-3279"
			],
			"source_name": "ETDA:Lead",
			"tools": [
				"Agentemis",
				"BleDoor",
				"Cobalt Strike",
				"CobaltStrike",
				"RbDoor",
				"RibDoor",
				"Winnti",
				"cobeacon"
			],
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