Rule History

SID: 2003174 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 8 • Jul 30, 2010, 12:00 PM

Message:

ET SHELLCODE Possible UTF-16 encoded Shellcode Detected

Rule:

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET SHELLCODE Possible UTF-16 encoded Shellcode Detected"; flow:from_server,established; content:"%u"; nocase; isdataat:4; content:!"|0A|"; within:4; content:!"|20|"; within:4; pcre:"/(%U([0-9a-f]{4})){6}/i"; classtype:trojan-activity; sid:2003174; rev:8; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2019_07_26;)

Created:

Jul 30, 2010, 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-shellcode.rules