alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ServHelper CnC Command (Whoami)"; flow:from_server,established; http.stat_code; content:"200"; file.data; content:"shell^whoami"; depth:12; fast_pattern; reference:md5,8efa9d3c901234f24659a8ea9c3fee14; reference:url,www.cybereason.com/blog/threat-actor-ta505-targets-financial-enterprises-using-lolbins-and-a-new-backdoor-malware; classtype:command-and-control; sid:2027303; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_01, deployment Perimeter, confidence High, signature_severity Major, tag ServHelper, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_28;)