{ "id": "5baa75f8-bd97-4357-b9a3-4ba73f3087ec", "created_at": "2026-10-14T02:03:48.897372Z", "updated_at": "2026-10-14T02:05:55.06753Z", "deleted_at": null, "sha1_hash": "0dd8fa06e9f31a6850c71bf4778fbe4c7d2655a0", "title": "Flamer: A Recipe for Bluetoothache", "llm_title": "", "authors": "", "file_creation_date": "0001-01-01T00:00:00Z", "file_modification_date": "0001-01-01T00:00:00Z", "file_size": 150358, "plain_text": "https://web.archive.org/web/20120604050149/https://www.symantec.com/connect/blogs/flamer-recipe-bluetoothache\n\nFlamer: A Recipe for Bluetoothache\n\nArchived: 2026-10-14 02:00:50 UTC\n\nW32.Flamer is possibly the only Windows based threat we have encountered which uses Bluetooth. It is yet\n\nanother indicator that W32.Flamer is not only exceptional, but that it is a comprehensive information gathering\n\nand espionage tool. The CrySyS laboratory has previously documented the technical details of Bluetooth in\n\nW32.Flamer. But, what does this actually mean for potential victims targeted by Flamer? What can an attacker\n\naccomplish using Bluetooth?\n\nThe Bluetooth functionality in Flamer is encoded in a module called \"BeetleJuice\". This module is triggered\n\naccording to configuration values set by the attacker. When triggered it performs two primary actions:\n\n1. The first is to scan for all Bluetooth devices in range. When a device is found, its status is queried and the\n\ndetails of the device recorded—including its ID—presumably to be uploaded to the attacker at some point.\n\n2. The second action is to configure itself as a Bluetooth beacon. This means that a computer compromised\n\nby W32.Flamer will appear when any other Bluetooth device scans the local area. And there is more. In\n\naddition to enabling a Bluetooth beacon, Flamer encodes details about the infected computer (see Figure 1)\n\nand then stores these details in a special 'description' field. When any other device scans for Bluetooth-\n\nenabled devices, this description field will be displayed:\n\nThese are the facts of how Flamer uses Bluetooth. And what can the attacker do with this functionality? There are\n\nseveral potential avenues available:\n\nScenario #1 – Identification of victim social networks\n\nBy continuously monitoring the Bluetooth devices within range of a W32.Flamer compromised computer, the\n\nattacker can build a profile of various devices encountered throughout the day. This will be particularly effective if\n\nPage 1 of 4\n\nhttps://web.archive.org/web/20120604050149/https://www.symantec.com/connect/blogs/flamer-recipe-bluetoothache\n\nthe compromised computer is a laptop because the victim is more likely to carry it around. Over time, as the\n\nvictim meets associates and friends, the attackers will catalog the various devices encountered, most likely mobile\n\nphones. This way the attackers can build a map of interactions with various people—and identify the victim's\n\nsocial and professional circles.\n\nScenario #2 – Identification of victim physical locations\n\nWhen compromising a victim's computer, the attacker has determined that this particular victim and their location\n\nis a high-priority target. While the building that the victim resides in can be known, the actual office is not\n\nidentified. The attacker, however, could identify the location of compromised devices using Bluetooth.\n\nBluetooth operates over radio waves. By measuring the strength of a radio wave signal, an attacker can measure if\n\nhe is she is getting closer or further away to a particular device. With the Bluetooth beacon turned on, and with the\n\ndetails of a particular compromised device available in the description field, it is straightforward for the attacker to\n\nidentify the physical location of a W32.Flamer compromised computer or device.\n\nAn alternative to this is that rather than identifying the actual compromised computer, the attacker identifies a\n\nmobile phone which belongs to the victim. The Beetlejuice module already has retrieved a list of all the devices\n\nIDs which are near to the infected computer and so the attacker knows what devices belong to the victim. It is\n\nPage 2 of 4\n\nhttps://web.archive.org/web/20120604050149/https://www.symantec.com/connect/blogs/flamer-recipe-bluetoothache\n\nlikely that one of the devices is a mobile phone which the victim carries most times. Now the attacker has the\n\nability to passively monitor for the victim, without installing or modifying the victim's devices. Bluetooth\n\nmonitoring devices could be placed in airports, train stations, or any transport hub, and listen for the ID values of\n\nany known victim device. Some attacks have even identified Bluetooth devices more than one mile away. The\n\nmore sinister aspect of this passive sniffing is that it allows the attacker to pinpoint a victim and, therefore, more\n\neasily track them in the future.\n\nScenario #3 – Enhanced information gathering\n\nAs described in our previous blog, a substantial part of Flamer’s functionality is implemented in Lua scripts, or\n\n'apps' which are downloaded from the FLAME 'app repository’. It would be trivial for an attacker to upload a new\n\nmalicious Bluetooth Lua app into the FLAME store for download onto a compromised device. With increase\n\nfunctionality an attacker, having identified various Bluetooth devices in range, could perform numerous attacks:\n\nSteal contacts from an address book, steals SMS messages, steals images, and more.\n\nUse a device to eavesdrop. Connect a compromised computer to a nearby device and enable handsfree\n\ncommunication. When the device is brought into a meeting room, or used to make a call, the attackers\n\ncould listen in.\n\nExfiltrate already-stolen data through any nearby device's data connection. This would bypass any firewalls\n\nor network controls. An attacker within one mile of the target could use their own Bluetooth-enabled\n\ndevice for this.\n\nPage 3 of 4\n\nhttps://web.archive.org/web/20120604050149/https://www.symantec.com/connect/blogs/flamer-recipe-bluetoothache\n\nIt is possible that there is undiscovered code within W32.Flamer which already achieves some of these goals. For\n\nexample, although we have not found network code near the 'beacon' code, one compromised computer may\n\nconnect to another computer using Bluetooth. If the second computer is using a secured network and was infected\n\nthrough a USB connection, potentially the only network available would be a Bluetooth connection back to the\n\nfirst compromised computer. The code to achieve this may already exist in Flame.\n\nThe various theories described here are all practical attacks, easily to implement by a skilled attacker. The\n\nsophistication of W32.Flamer indicates that the attackers are certainly technically skilled and such attacks are well\n\nwithin their capabilities.\n\nSource: https://web.archive.org/web/20120604050149/https://www.symantec.com/connect/blogs/flamer-recipe-bluetoothache\n\nPage 4 of 4", "extraction_quality": 1, "language": "EN", "sources": [ "MITRE" ], "origins": [ "web" ], "references": [ "https://web.archive.org/web/20120604050149/https://www.symantec.com/connect/blogs/flamer-recipe-bluetoothache" ], "report_names": [ "flamer-recipe-bluetoothache" ], "threat_actors": [], "ts_created_at": 1791943428, "ts_updated_at": 1791943555, "ts_creation_date": 0, "ts_modification_date": 0, "files": { "pdf": "https://archive.orkl.eu/0dd8fa06e9f31a6850c71bf4778fbe4c7d2655a0.pdf", "text": "https://archive.orkl.eu/0dd8fa06e9f31a6850c71bf4778fbe4c7d2655a0.txt", "img": "https://archive.orkl.eu/0dd8fa06e9f31a6850c71bf4778fbe4c7d2655a0.jpg" } }