Rule History

SID: 2049263 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 2 • Nov 20, 2023, 12:00 PM

Message:

ET MALWARE Suspected Malicious JS Loader Activity (GET)

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Malicious JS Loader Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[a-z]{8,12}$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern; bsize:57; http.header_names; content:!"Referer"; target:src_ip; reference:md5,93419e7818759ebd01e65a84f4c6535d; classtype:trojan-activity; sid:2049263; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_11_20, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_31; target:src_ip;)

Created:

Nov 20, 2023, 12:00 PM

Updated:

Jan 31, 2024, 12:00 PM

DB Created:

Nov 20, 2023, 11:00 PM

DB Updated:

Aug 18, 2025, 8:35 PM

Filename:

rules/emerging-malware.rules