Rule History

SID: 2038605 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 2 • Aug 24, 2022, 12:00 PM

Message:

ET ATTACK_RESPONSE Nishang Invoke-PowerShellTcp Shell Prompt Outbound

Rule:

alert tcp-pkt $HOME_NET any -> any any (msg:"ET ATTACK_RESPONSE Nishang Invoke-PowerShellTcp Shell Prompt Outbound"; flow:established,to_server; stream_size:server,<,5; content:"Windows PowerShell running as user"; startswith; fast_pattern; content:"|20|on|20|"; within:258; reference:url,github.com/samratashok/nishang/blob/master/Shells/Invoke-PowerShellTcp.ps1; classtype:bad-unknown; sid:2038605; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_08_24, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_12;)

Created:

Aug 24, 2022, 12:00 PM

Updated:

Dec 12, 2024, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 1, 2025, 8:35 PM

Filename:

rules/emerging-attack_response.rules