This article provides a detailed overview of how to bypass modern detections such as EDR solutions and antivirus software using a highly customized and advanced Cobalt Strike profile. It begins by discussing the importance of the sleep_mask option, which enables Cobalt Strike to XOR the heap and image sections of its beacon prior to sleeping, making it undetectable by memory scanners like BeaconEye and Hunt-Sleeping-Beacons. It then explains how the obfuscate option can be used to remove most of the strings stored in the beacon’s heap, but that it is not enough to bypass static signatures. It then explains how different compilers can be used to tailor the output for specific use cases, and how Clang++ can be used to bypass Windows Defender.
The article then explains how the profile can be modified to remove suspicious strings, and how the prepend option can be used to append opcodes to the generated raw Shellcode. It also explains how the rich_header option can be used to make the beacon look more legitimate, and how it can be used to bypass YARA rules. It then moves on to improving the Post Exploitation stage by updating the profile to include options such as
set pipename "Winsock2\CatalogChangeListener-###-0"
set spawnto_x86 "%windir%\syswow64\wbem\wmiprvse.exe -Embedding"
set spawnto_x64 "%windir%\sysnative\wbem\wmiprvse.exe -Embedding"
set obfuscate "true"
set smartinject "true"
set amsi_disable "false"
and set keylogger "GetAsyncKeyState"
It then explains how to bypass the Sophos, by enabling the option set magic_pe "EA" and adding a prepend of NOPs instructions.
The article concludes by discussing how the scripts and final profiles used for bypasses are published in the Github repository and how, with the ability to tailor the Cobalt Strike profile to specific environments, threat actors gain a powerful advantage in bypassing traditional security measures. By following the steps outlined in the article, users can create an OPSEC-safe profile that can evade detection. This article provides a comprehensive overview of how to use Malleable C2 profiles to bypass memory scanners, static signatures, and YARA rules, as well as how to tailor the output for specific use cases and
📓 Bypassing EDR with Cobalt Strike Profiles 👉🏽 Detailed overview of bypassing modern detections like EDR solutions and antivirus software. 👉🏽 Importance of the sleep_mask option to make Cobalt Strike undetectable by memory scanners. 👉🏽 Using the obfuscate option to remove strings in the beacon's heap. 👉🏽 Different compilers for tailoring output and using Clang++ to bypass Windows Defender. 👉🏽 Modifying the profile to remove suspicious strings and appending opcodes to shellcode. 👉🏽 Using the rich_header option to make the beacon look legitimate and bypass YARA rules. 👉🏽 Updating the profile to enhance Post Exploitation stage with various options. 👉🏽 Bypassing Sophos by enabling set magic_pe option and adding NOPs instructions. 👉🏽 Scripts and final profiles available in the Github repository. 👉🏽 Creating an OPSEC-safe profile to evade detection and gain advantage over traditional security measures.
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