MAR-10303705-1.v1 – Remote Access Trojan: SLOTHFULMEDIA | CISA Published: 2020-10-01 · Archived: 2026-04-05 13:02:27 UTC Notification This report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained herein. The DHS does not endorse any commercial product or service referenced in this bulletin or otherwise. This document is marked TLP:WHITE--Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol (TLP), see http://www.us-cert.gov/tlp. Summary Description This Malware Analysis Report (MAR) is the result of analytic efforts between the Cybersecurity and Infrastructure Security Agency (CISA) and the Cyber National Mission Force (CNMF). The malware variant, known as SlothfulMedia, has been used by a sophisticated cyber actor. CISA and CNMF are distributing this MAR to enable network defense and reduced exposure to malicious activity. This MAR includes suggested response actions and recommended mitigation techniques. The sample is a dropper, which deploys two files when executed. The first is a remote access tool (RAT) named ‘mediaplayer.exe’’, which is designed for command and control (C2) of victim computer systems. Analysis has determined the RAT has the ability to terminate processes, run arbitrary commands, take screen shots, modify the registry, and modify files on victim machines. It appears to communicate with its C2 controller via Hypertext Transfer Protocol (HTTP) over Transmission Control Protocol (TCP). The second file has a random five-character name and deletes the dropper once the RAT has persistence. Persistence is achieved through the creation of a service named “Task Frame”, which ensures the RAT is loaded after a reboot. Users or administrators should flag activity associated with the malware and report the activity to the CISA or the FBI Cyber Watch (CyWatch), and give the activity the highest priority for enhanced mitigation. For more information on malicious cyber activity, please visit https[:]//www[.]us-cert.gov. For a downloadable copy of IOCs, see MAR-10303705-1.v1.stix. Submitted Files (1) 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 (448838B2A60484EE78C2198F2C0C9C...) Additional Files (2) 4186b5beb576aa611b84cbe95781c9dccca6762f260ac7a48f6727840fc057fa (wHPEO.exe) 927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae (mediaplayer.exe) Domains (1) sdvro.net Findings 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 Tags botdropperinformation-stealerkeyloggerremote-access-trojantrojan Details https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 1 of 9 Name 448838B2A60484EE78C2198F2C0C9C85 Size 117760 bytes Type PE32 executable (GUI) Intel 80386, for MS Windows MD5 448838b2a60484ee78c2198f2c0c9c85 SHA1 f2c43a01cabaa694228f5354ea8c6bcf3b7a49b3 SHA256 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 SHA512 9e532af06e5f4764529211e8c5c749baa7b01c72f11b603218c3c08d70cf1e732f8d9d81ec257ca247aaa96d1502150a2f402b1b3914780b6 ssdeep 3072:PGA5q4Xmco7ciR7BiU+q+TESaiQ4RHpxJdW:O0qtUYBiU+qRiQy Entropy 6.156007 Antivirus BitDefender Dropped:Generic.Malware.Fdldg.B04B59A4 Comodo TrojWare.Win32.ButeRat.PP Emsisoft Dropped:Generic.Malware.Fdldg.B04B59A4 (B) Ikarus Trojan-PWS.Win32.Zbot Lavasoft Dropped:Generic.Malware.Fdldg.B04B59A4 YARA Rules No matches found. ssdeep Matches No matches found. PE Metadata Compile Date 2019-04-29 10:19:52-04:00 Import Hash 3e935061f369e95ac9d62c7cbdf4acf1 PE Sections MD5 Name Raw Size Entropy 502dceaf120f990b5118230438102568 header 1024 2.390635 1ec70611505f1cebfc859820b45b6cc3 .text 39424 6.506891 dfebe81d71d56100ac07b85046f07b77 .rdata 12288 4.988754 06f5259aac1a4462eaf12334dc0e8daf .data 59392 6.004077 c2d6c399730fd89b16d2b6d6cec5e393 .rsrc 512 5.105006 1587227ab56ecfb9c5b85aaf24d98454 .reloc 5120 3.993742 Packers/Compilers/Cryptors Relationships 64d78eec46... Dropped 4186b5beb576aa611b84cbe95781c9dccca6762f260ac7a48f6727840fc057fa 64d78eec46... Connected_To sdvro.net 64d78eec46... Dropped 927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 2 of 9 Description This file is a 32-bit Windows executable. When executed, it will drop a file called 'mediaplayer.exe' (927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae) into the path %AppData%\Media\. A link file called 'media.lnk' is also placed in this path. A third file is placed in the path %TEMP% and is given a five character random name with an '.exe' extension, e.g. 'wHPEO.exe' (4186b5beb576aa611b84cbe95781c9dccca6762f260ac7a48f6727840fc057fa). This file is created with a 'hidden' attribute to insure that it is not visible to the user. Next, the program will create a service on the system called "TaskFrame" with the following parameters: --- Begin Service Parameters --- HKLM\System\CurrentControlSet\Services\TaskFrame    Type: 272 HKLM\System\CurrentControlSet\Services\TaskFrame    Start: 2 HKLM\System\CurrentControlSet\Services\TaskFrame    ErrorControl: 1 HKLM\System\CurrentControlSet\Services\TaskFrame    ImagePath: C:\Users\ \AppData\Roaming\Media\mediaplayer.exe HKLM\System\CurrentControlSet\Services\TaskFrame    DisplayName: TaskFrame HKLM\System\CurrentControlSet\Services\TaskFrame    ObjectName: LocalSystem --- End Service Parameters --- This service is used to create persistence on the system and is designed to start the 'mediaplayer.exe' (927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae) program each time the system is started. Next, the program will collect system information to send to the command and control (C2). A unique identifier is created and sent in a POST request along with a Unix timestamp of the time of infection to the domain www[.]sdvro.net. Connection attempts are made via both HTTP and HTTPS. The following is a sample of the POST request: --- Begin POST Request --- POST /v?m=u2fssrqh8cl0&i=1598908417 HTTP/1.1 Accept: application/octet-stream,application/xhtml Content-Length: 436 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Host: www[.]sdvro.net Connection: Keep-Alive Cache-Control: no-cache ..D......!F.1y^.4.&....{ ..f]..Fz...;..H.\L`p..$.H..0A.A(An_8...;..$yH.t..4H...3..K.QvRkX.c..|r r=..V.F.....Hc.H......H. <..tfH....@..uU.@.....uL..D.=o..l!'..D$hH.&.H.f..H.f(..F..n.H..H.\$`H.l$pH..0A_A]A\_^...H.\$.H.t..gH...3..f..K..-. ..|     =../.:.....Hc.H......H.<..tfH....@..uU.r.0.0.[L..t. o..2!v..D hy...p.f..H.f(..F..n.H..H.\$`H.l$pH..0A_A]A\_^...H.\$.H.t$.WH..03..K..K(...3..|$ ;=..........Hc.H......H.:..tWH....@..uU.@.....uL..D. --- End POST Request --- The domain did not resolve to an IP address at the time of analysis. Note: The malware uses the fixed User-Agent string, "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75" in its communication. The following notable strings were found in unreferenced data within the file. The purpose of the strings could not be determined. The strings are not used by the code. --- Begin Notable Strings --- C:\Users\david\AppData\Roaming\Media\mediaplayer.exe david-pc --- End Notable Strings --- sdvro.net Tags command-and-control Ports https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 3 of 9 80 TCP 443 TCP HTTP Sessions POST /v?m=u2fssrqh8cl0&i=1598908417 HTTP/1.1 Accept: application/octet-stream,application/xhtml Content-Length: 436 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Host: www.sdvro.net Connection: Keep-Alive Cache-Control: no-cache ..D......!F.1y^.4.&....{ ..f]..Fz...;..H.\L`p..$.H..0A.A(An_8...;..$yH.t..4H...3..K.QvRkX.c..|r r=..V.F.....Hc.H......H. <..tfH....@..uU.@.....uL..D.=o..l!'..D$hH.&.H.f..H.f(..F..n.H..H.\$`H.l$pH..0A_A]A\_^...H.\$.H.t..gH...3..f..K..-. ..|     =../.:.....Hc.H......H.<..tfH....@..uU.r.0.0.[L..t. o..2!v..D hy...p.f..H.f(..F..n.H..H.\$`H.l$pH..0A_A]A\_^...H.\$.H.t$.WH..03..K..K(...3..|$ ;=..........Hc.H......H.:..tWH....@..uU.@.....uL..D. Whois Domain Name: SDVRO.NET Registry Domain ID: 2371496862_DOMAIN_NET-VRSN Registrar WHOIS Server: whois.west263.com Registrar URL: http://www.west.cn/ Updated Date: 2020-03-31T08:26:43Z Creation Date: 2019-03-21T07:42:43Z Registry Expiry Date: 2021-03-21T07:42:43Z Registrar: Chengdu West Dimension Digital Technology Co., Ltd. Registrar IANA ID: 1556 Registrar Abuse Contact Email: Registrar Abuse Contact Phone: Domain Status: ok https://icann.org/epp#ok Name Server: NS3.MYHOSTADMIN.NET Name Server: NS4.MYHOSTADMIN.NET DNSSEC: unsigned Domain Name: sdvro.net                 Registry Domain ID: whois protect Registrar WHOIS Server: whois.west.cn Registrar URL: www.west.cn Updated Date: 2019-03-21T07:42:42.0Z Creation Date: 2019-03-21T07:42:42.0Z Registrar Registration Expiration Date: 2021-03-21T07:42:42.0Z Registrar: Chengdu west dimension digital technology Co., LTD Registrar IANA ID: 1556 Reseller: Domain Status: ok http://www.icann.org/epp#ok Registry Registrant ID: Not Available From Registry Registrant Name: REDACTED FOR PRIVACY Registrant Organization: REDACTED FOR PRIVACY Registrant Street: REDACTED FOR PRIVACY Registrant City: Chengdu Registrant State/Province: Sichuan Registrant Postal Code: REDACTED FOR PRIVACY Registrant Country: CN Registrant Phone: REDACTED FOR PRIVACY Registrant Phone Ext: Registrant Fax: REDACTED FOR PRIVACY https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 4 of 9 Registrant Fax Ext: Registrant Email: link at https://www.west.cn/web/whoisform?domain=sdvro.net Registry Admin ID: Not Available From Registry Admin Name: REDACTED FOR PRIVACY Admin Organization: REDACTED FOR PRIVACY Admin Street: REDACTED FOR PRIVACY Admin City: Chengdu Admin State/Province: Sichuan Admin Postal Code: REDACTED FOR PRIVACY Admin Country: CN Admin Phone: REDACTED FOR PRIVACY Admin Phone Ext: Admin Fax: REDACTED FOR PRIVACY Admin Fax Ext: Admin Email: link at https://www.west.cn/web/whoisform?domain=sdvro.net Registry Tech ID: Not Available From Registry Tech Name: REDACTED FOR PRIVACY Tech Organization: REDACTED FOR PRIVACY Tech Street: REDACTED FOR PRIVACY Tech City: Chengdu Tech State/Province: Sichuan Tech Postal Code: REDACTED FOR PRIVACY Tech Country: CN Tech Phone: REDACTED FOR PRIVACY Tech Phone Ext: Tech Fax: REDACTED FOR PRIVACY Tech Fax Ext: Tech Email: link at https://www.west.cn/web/whoisform?domain=sdvro.net Name Server: ns3.myhostadmin.net Name Server: ns4.myhostadmin.net DNSSEC: signedDelegation Relationships sdvro.net Connected_From 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 Description This domain did not resolve to an IP address at the time of analysis. 927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae Tags remote-access-trojan Details Name mediaplayer.exe Size 46080 bytes Type PE32 executable (GUI) Intel 80386, for MS Windows MD5 9f23bd89694b66d8a67bb18434da4ee8 SHA1 db8c6ea90b1be5aa560bfbe5a34577eb284243af SHA256 927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae SHA512 72e95a90dc8ee2fd69b26665e88d19b1d36527fe8bbc03e252d4be925cf4acae20a3155dcd7caa50daf6e16d201a16822d77356c91654a6e4 ssdeep 768:NRw4PZcMc8ie9+dZL6DSKdzxSGyCevVcxjw3e3PxKfRXAxo3vhxfFORpa9sxw:NRwaBiU+dZODSKeGHSaxjw3QUfRH/hx7 Entropy 6.320571 https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 5 of 9 Antivirus BitDefender Gen:Variant.Fugrafa.6689 Emsisoft Gen:Variant.Fugrafa.6689 (B) Lavasoft Gen:Variant.Fugrafa.6689 Symantec Heur.AdvML.B YARA Rules No matches found. ssdeep Matches No matches found. PE Metadata Compile Date 2019-04-29 10:18:34-04:00 Import Hash db182005fc9fccab434ec0764ea5a244 Company Name Tdl Corporation File Description Local Security Process Internal Name None Legal Copyright Copyright (C) 2018 Original Filename None Product Name Tdl Corporation Product Version 1.0.0.1 PE Sections MD5 Name Raw Size Entropy faf4cd402ffdb84551c382ea45f2f893 header 1024 2.514929 7e3095c827af75a349f3c206925932cd .text 31232 6.493665 614ccbacb5de6dae94b6af93aa5a83fc .rdata 8192 5.232371 543ffbd535401feb9f37c585d9f161f3 .data 1536 4.679413 7c1584feb039309d7a4307c39adaa54f .rsrc 1024 2.333786 79345fb74e56359cd6eb957ceb52e0ab .reloc 3072 4.519356 Packers/Compilers/Cryptors Relationships 927d945476... Dropped_By 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 Description This file is a 32-bit Windows executable file that is dropped and executed by 448838B2A60484EE78C2198F2C0C9C85. The file is called 'mediaplayer.exe'. When executed, it will look for a file called 'Junk9' and will attempt to delete it. The file 'Junk9' was not available for analysis. Next, it will take a screenshot of the user's desktop and name it 'Filter3.jpg' and store this in the local directory. The program then looks for a service called 'TaskFrame' and attempts to start it. The 'TaskFrame' service is able to delete, add, or modify registry keys, and start and stop a keylogger program on the system. If the 'TaskFrame' service is already installed and running the program will terminate. https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 6 of 9 The malware will create a mutex on the system called 'Global\mukimukix'. The program changes the proxy configuration of the system with the following registry modifications: --- Begin Registry Modification --- HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\    Name: ProxyBypass    Value: 1 HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ Name: IntranetName Value: 1 HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ Name: UNCAsIntranet Value: 1 --- End Registry Modification --- The program collects the computer name, user name, OS version, adapter information, memory usage, and logical drives for the system. This information is concatenated into a string that is hashed and sent as part of the initial POST request to the C2. The program will expect to receive a '200 OK' response from the C2 before it begins transmission. If it receives a '501 Error' the program sleeps for three seconds and attempts another connection. If the initial connection to the C2 is successful, the program will await a command. The program is capable of executing the following tasks from commands issued by the C2: --- Begin Program Capabilities --- 1. Create, Write, and Delete files. 2. Open a Command Line. 3. Move Files. 4. Enumerate Open Ports. 5. Enumerate Drives. 6. Enumerate Processes by ID, Name, or Privileges. 7. Start and Stop Processes. 8. Enumerate Files and Directories. 9. Open a Named Pipe and Send and Receive Data. 10. Take Screenshots. 11. Inject into User Processes. 12. Enumerate Services. 13. Start/Stop Services. 14. Modify the Registry. 15. Open/Close TCP and UDP Sessions. --- End Program Capabilities --- The program will also look for the following paths: \SetupUi, \AppIni, and \ExtInfo. The purpose for this search could not be determined. 4186b5beb576aa611b84cbe95781c9dccca6762f260ac7a48f6727840fc057fa Tags remote-access-trojan Details Name wHPEO.exe Size 7168 bytes Type PE32 executable (GUI) Intel 80386, for MS Windows MD5 92a40c64cea4a87de1c24437612f2e0f SHA1 f52f0685a72d6a8f3e119ce92b7cf1c2c6a83bb9 SHA256 4186b5beb576aa611b84cbe95781c9dccca6762f260ac7a48f6727840fc057fa SHA512 d0714d09dcac070eb8d0971e953ce0c0382658d5682982a8045dcf29da9a729be57dc7d60c4e18f1833966f6c6584e9a883871eef8d1c9f9d ssdeep 192:DcTrBTVdZzgW+mpWpc9aThFJJRmqSA9iu:c7EmpWpc9aThFVviu Entropy 5.395407 https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 7 of 9 Antivirus No matches found. YARA Rules No matches found. ssdeep Matches No matches found. PE Metadata Compile Date 2017-12-04 08:14:24-05:00 Import Hash 6ab19ee53c87a04ccb965f5f658b717a PE Sections MD5 Name Raw Size Entropy d6cd352d657372b25707fed98bc3bd0b header 1024 2.379332 c036d2e814490871e54dd84e8117e044 .text 2560 5.788179 2f2819452977bcfd6dcac4389a2cd193 .rdata 1536 4.849405 afadce14c7f045a0390158515331a054 .data 512 1.342806 554d0cedd69e96ee00c8324ce4da604c .rsrc 1024 5.194460 ed7fec6ad28b233df4676dad7f306c3c .reloc 512 4.741130 Packers/Compilers/Cryptors Relationships 4186b5beb5... Dropped_By 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 Description This artifact is a 32-bit Windows executable that is dropped by 448838B2A60484EE78C2198F2C0C9C85. This program has some anti-forensic capability and is designed to clear indicators of compromise (IOCs) from the system. The program first verifies that the service 'TaskFrame' is running then adds the following key to the registry: --- Begin Registry Modification --- HKLM\System\CurrentControlSet\Control\SessionManager\PendingFileRenameOperations Data: \??\C:\Users\\AppData\Local\Temp\wHPEO.exe --- End Registry Modification --- This modification insures that the file is deleted with the next system restart. The program will also delete the user's 'index.dat' file thus removing the user’s recent Internet history from the system. Relationship Summary 64d78eec46... Dropped 4186b5beb576aa611b84cbe95781c9dccca6762f260ac7a48f6727840fc057fa 64d78eec46... Connected_To sdvro.net 64d78eec46... Dropped 927d945476191a3523884f4c0784fb71c16b7738bd7f2abd1e3a198af403f0ae sdvro.net Connected_From 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 927d945476... Dropped_By 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 4186b5beb5... Dropped_By 64d78eec46c9ddd4b9a366de62ba0f2813267dc4393bc79e4c9a51a9bb7e6273 https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 8 of 9 Recommendations CISA recommends that users and administrators consider using the following best practices to strengthen the security posture of their organization's systems. Any configuration changes should be reviewed by system owners and administrators prior to implementation to avoid unwanted impacts. Maintain up-to-date antivirus signatures and engines. Keep operating system patches up-to-date. Disable File and Printer sharing services. If these services are required, use strong passwords or Active Directory authentication. Restrict users' ability (permissions) to install and run unwanted software applications. Do not add users to the local administrators group unless required. Enforce a strong password policy and implement regular password changes. Exercise caution when opening e-mail attachments even if the attachment is expected and the sender appears to be known. Enable a personal firewall on agency workstations, configured to deny unsolicited connection requests. Disable unnecessary services on agency workstations and servers. Scan for and remove suspicious e-mail attachments; ensure the scanned attachment is its "true file type" (i.e., the extension matches the file header). Monitor users' web browsing habits; restrict access to sites with unfavorable content. Exercise caution when using removable media (e.g., USB thumb drives, external drives, CDs, etc.). Scan all software downloaded from the Internet prior to executing. Maintain situational awareness of the latest threats and implement appropriate Access Control Lists (ACLs). Additional information on malware incident prevention and handling can be found in National Institute of Standards and Technology (NIST) Special Publication 800-83, "Guide to Malware Incident Prevention & Handling for Desktops and Laptops". Contact Information Document FAQ What is a MIFR? A Malware Initial Findings Report (MIFR) is intended to provide organizations with malware analysis in a timely manner. In most instances this report will provide initial indicators for computer and network defense. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis. What is a MAR? A Malware Analysis Report (MAR) is intended to provide organizations with more detailed malware analysis acquired via manual reverse engineering. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis. Can I edit this document? This document is not to be edited in any way by recipients. All comments or questions related to this document should be directed to the CISA at 1-844-Say-CISA or CISA Central . Can I submit malware to CISA? Malware samples can be submitted via three methods: Web: https://malware.us-cert.gov E-Mail: submit@malware.us-cert.gov FTP: ftp.malware.us-cert.gov (anonymous) CISA encourages you to report any suspicious activity, including cybersecurity incidents, possible malicious code, software vulnerabilities, and phishing-related scams. Reporting forms can be found on CISA's homepage at www.cisa.gov. Source: https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a https://us-cert.cisa.gov/ncas/analysis-reports/ar20-275a Page 9 of 9