Versions (4)
Version DetailsCurrent
Rev: 1 • Mar 23, 2016, 12:00 PMET MALWARE Possible Locky Ransomware Writing Encrypted File over - SMB and SMB-DS v1 ASCII
alert tcp $HOME_NET any -> $EXTERNAL_NET [445,139] (msg:"ET MALWARE Possible Locky Ransomware Writing Encrypted File over - SMB and SMB-DS v1 ASCII"; flow:to_server,established; content:"|ff|SMB|a2|"; offset:4; depth:5; byte_test:1,!&,0x80,6,relative; content:".locky|00|"; nocase; distance:0; fast_pattern; classtype:trojan-activity; sid:2022638; rev:1; metadata:attack_target Client_Endpoint, created_at 2016_03_23, deployment Perimeter, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)
Mar 23, 2016, 12:00 PM
Jul 26, 2019, 12:00 PM
Sep 21, 2024, 3:00 AM
Oct 3, 2025, 8:34 PM
rules/emerging-malware.rules