alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SoulSearcher Checkin M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/msn-msn/log/2/debug?tim="; startswith; fast_pattern; http.host; content:"trc.taboola.com"; http.request_body; content:"|00 00 00 11|"; startswith; byte_jump:4,8,relative,little,post_offset -1; isdataat:!2,relative; content:"|78 9c|"; offset:16; depth:2; reference:url,www.fortinet.com/blog/threat-research/unraveling-the-evolution-of-the-soul-searcher-malware; reference:md5,9a32e5a45336e705d23adc865bd30704; classtype:command-and-control; sid:2035415; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_09, deployment Perimeter, malware_family SoulSearcher, performance_impact Low, confidence High, signature_severity Major, tag c2, updated_at 2022_03_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)