Versions (3)
Version DetailsCurrent
Rev: 2 • Jan 8, 2026, 12:00 PMET MALWARE MaskGramStealer Host Profile Exfil (POST)
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MaskGramStealer Host Profile Exfil (POST)"; flow:established,to_server; http.method; content:"POST"; http.user_agent; bsize:10; content:"Client/1.0"; http.header_names; content:"|0d 0a|x-filename|0d 0a|x-browser-type|0d 0a|x-profile-name|0d 0a|"; nocase; fast_pattern; reference:md5,25041e230c55fd46e5ef52ab02b3bc6c; classtype:command-and-control; sid:2066625; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_08, deployment Perimeter, deployment SSLDecrypt, malware_family MaskGramStealer, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_05_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)
Jan 8, 2026, 12:00 PM
May 5, 2026, 12:00 PM
Jan 8, 2026, 10:34 PM
May 5, 2026, 9:34 PM
rules/emerging-malware.rules