![]() ![]() X86_64-w64-mingw32-gcc -m64 -Os src-common/patch.c src-common/bypass-template.c src-main/main.c -Wall -mwindows -o temp.exe -DDATA_SIZE =271360 Let’s take a look at the compilation command for the 64-bit stageless executable: The kit also contains a build script that uses mingw-gcc to cross-compile the artifacts on linux systems. For those following along at home, we will be sticking to the basic template. Once obtained, the artifact kit comes with one basic template and 3 implementations that attempt to bypass AV sandboxes in some way. Given the prominence of host-based detection systems, executable files come under great scrutiny and customising these payloads can help greatly in staying undetected or delaying the incident response. This means that any time the default psexec lateral movement technique is used, for example, a payload from the artifact kit can be used. The kit can be used to create custom payloads that will be employed by CobaltStrike whenever a payload such as a dll, regular exe or service exe is required. Raphael Mudge, the creator of CobaltStrike, offers a great introduction to the use of the Artifact kit in this video. This kit is available to licensed CobaltStrike users and can be obtained at. One of these options is the use of the Artifact kit to customise the payloads CobaltStrike generates. The Artifact kitĬobaltStrike offers many options for customisation. As such, there will be no associated repo. ![]() As Syswhispers uses MASM syntax for the generated assembly, we will be working through the minor changes required to compile the artifact kit on Windows using Visual Studio.Īs the CobaltStrike Artifact kit is not available for public download but requires a license to access, I will not be sharing any of the source code of the kit, but will be limiting myself to a more general approach for this post. Specifically I will be implementing the excellent Syswhispers tool by jthuraisamy. In this blog post I will try and give a basic introduction to the CobaltStrike Artifact kit, as well as detail the implementation of using direct syscalls over Windows API functions to bypass EDR solutions. ![]()
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