Rule History

SID: 2021724 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 3 • Aug 28, 2015, 12:00 PM

Message:

ET MALWARE Alphacrypt/TeslaCrypt Ransomware CnC Beacon Response

Rule:

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Alphacrypt/TeslaCrypt Ransomware CnC Beacon Response"; flow:established,to_client; file_data; content:"---!!!INSERTED!!!---"; within:20; reference:md5,ee90ec9935c7b8e1a5dad364d4545851; classtype:command-and-control; sid:2021724; rev:3; metadata:attack_target Client_Endpoint, created_at 2015_08_28, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)

Created:

Aug 28, 2015, 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