Rule History

SID: 2024221 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 2 • Apr 18, 2017, 12:00 PM

Message:

ET MALWARE Possible Malicious Gzip PowerShell over HTTP

Rule:

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible Malicious Gzip PowerShell over HTTP"; flow:established,from_server; file_data; content:"FromBase64String"; content:"H4sIAI"; distance:0; fast_pattern; content:"GzipStream"; nocase; distance:0; classtype:trojan-activity; sid:2024221; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_18, deployment Perimeter, malware_family PowerShell, performance_impact Moderate, confidence Medium, signature_severity Major, tag PowerShell, updated_at 2019_07_26;)

Created:

Apr 18, 2017, 12:00 PM

Updated:

Jul 26, 2019, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

May 30, 2025, 12:04 AM

Filename:

rules/emerging-malware.rules