This technique defeats many encoders and packers that try to hide known bad from signature-based anti-virus products.Ĭobalt Strike’s counter to this is simple. If known bad shows up, the anti-virus product flags the executable or DLL as malicious. With each emulated step of execution, the anti-virus product checks for known bad in the emulated process space. These anti-virus products simulate execution of an executable in a virtual sandbox. Many anti-virus products go a step further. This obfuscation process defeats anti-virus products that use a simple string search to identify malicious code. To defeat this detection, it’s common for an attacker to obfuscate the shellcode in some way and place it in the binary. If we embed our known bad shellcode into an executable, an anti-virus product will recognize the shellcode and flag the executable as malicious. ![]() ![]() Traditional anti-virus products use signatures to identify known bad. ![]() The Artifact Kit is part of the Arsenal Kit, which contains a collection of kits-a source code framework to build executables and DLLs that evade some anti-virus products. Cobalt Strike uses the Artifact Kit to generate its executables and DLLs.
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