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Adversaries may communicate using application layer protocols associated with web traffic to avoid detection/network filtering by blending in with existing traffic.
Passed 21 of 23 test cases with the skill, and 12 of 23 without it.
and 11 more in the full report
9 fixed12 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 9 test cases the skill fixed. Same model, same prompt, with and without the skill.
A threat intelligence report cites malware abusing WebSocket channels and legacy HTTP user-agent patterns for C2 channels. Which legacy Opera web browser string is used in standardized C2 emulation tests for this technique?
| Checked | Without skill | With skill |
|---|---|---|
| Includes the Opera/8.81 (Windows NT 6.0; U; en) user-agent string | Missed | Passed |
The instructions your model reads when the skill loads.
Sub-technique of: T1071
Adversaries may communicate using application layer protocols associated with web traffic to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
Protocols such as HTTP/S and WebSocket that carry web traffic may be very common in environments. HTTP/S packets have many fields and headers in which data can be concealed. An adversary may abuse these protocols to communicate with systems under their control within a victim network while also mimicking normal, expected traffic.
Platforms: ESXi, Linux, macOS, Network Devices, Windows
The following tests are from Atomic Red Team and provide actionable ways to test this technique:
This test simulates an infected host beaconing to command and control. Upon execution, no output will be displayed. Use an application such as Wireshark to record the session and observe user agent strings and responses.
Inspired by APTSimulator - https://github.com/NextronSystems/APTSimulator/blob/master/test-sets/command-and-control/malicious-user-agents.bat
Supported Platforms: windows
test cases passed, vs 12 / 23 without
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