alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [PTsecurity] MSIL/Biskvit.A Check-in"; flow:established,to_server; urilen:15; http.method; content:"POST"; http.uri; content:"/api/auth/token"; http.header; header_lowercase; content:"authorization|3a 20 0d 0a|"; depth:18; fast_pattern; content:"expect|3a 20|100-continue"; http.request_body; content:"{|22|ApiKey|22 3a 22|"; startswith; isdataat:!100,relative; http.connection; content:"Keep-Alive"; startswith; http.content_type; content:"application/json"; startswith; http.header_names; strip_pseudo_headers; to_lowercase; content:"|0d 0a|authorization|0d 0a|"; startswith; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|user-agent|0d 0a|"; reference:url,www.fortinet.com/blog/threat-research/russian-army-exhibition-decoy-leads-to-new-biskvit-malware.html; classtype:trojan-activity; sid:2026007; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_08_22, deployment Perimeter, malware_family MSIL_Biskvit_A, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_01;)