NeedyMantis encryptbase64.ps1 shellcode loader (ROR-11 API hashing)
Detects the NeedyMantis second-stage loader, typically encountered as a malicious script (e.g., encryptbase64.ps1). The detection identifies raw shellcode residing in files that exhibit specific traits: PEB-walking for API resolution using a ROR(11) hashing algorithm, the inclusion of the 'RtlDecompressBuffer' API for payload expansion, and the absence of standard PowerShell script headers at the start of the file.
YARA
