Detectionhightest

PowerShell ShellCode

Detects Base64 encoded Shellcode

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

David Ledbetter (shellcode), Florian Roth (Nextron Systems)Created Sat Nov 17Updated Thu Jan 2516b37b70-6fcf-4814-a092-c36bd3aafcbdwindows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic

detection:
    selection:
        ScriptBlockText|contains:
            - 'OiCAAAAYInlM'
            - 'OiJAAAAYInlM'
    condition: selection

False Positives

Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References

MITRE ATT&CK

Tactics

Techniques

Sub-techniques

Rule Metadata

Rule ID

16b37b70-6fcf-4814-a092-c36bd3aafcbd

Status

test

Level

high

Type

Detection

Created

Sat Nov 17

Modified

Thu Jan 25

Author

Path

rules/windows/powershell/powershell_script/posh_ps_shellcode_b64.yml

Raw Tags

attack.defense-evasionattack.privilege-escalationattack.t1055attack.executionattack.t1059.001