Rule History

SID: 2035932 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 3 • Apr 13, 2022, 12:00 PM

Message:

ET USER_AGENTS Observed Malicious User-Agent (FastInvoice)

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Observed Malicious User-Agent (FastInvoice)"; flow:established,to_server; http.user_agent; content:"FastInvoice"; bsize:11; startswith; fast_pattern; reference:md5,42218b0ce7fc47f80aa239d4f9e000a1; classtype:bad-unknown; sid:2035932; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_13, deployment Perimeter, deprecation_reason Age, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_02, reviewed_at 2024_12_02;)

Created:

Apr 13, 2022, 12:00 PM

Updated:

Dec 2, 2024, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 3, 2025, 8:34 PM

Filename:

rules/emerging-user_agents.rules