alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Gasti.tm Checkin Activity"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"form|2d|data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|blob|22 0d 0a|"; fast_pattern; content:"name|3d 22|blob|5f|num|22 0d 0a|"; distance:0; content:"name|3d 22|blob|5f|num|22|name|3d 22|total|5f|blob|5f|num|22 0d 0a|"; distance:0; content:"name|3d 22|hashCode|22 0d 0a 0d 0a|"; content:"|0d 0a 2d 2d|"; distance:32; within:4; reference:md5,0b7504c8770d109f0bc326c1dd4cbee4; classtype:command-and-control; sid:2034678; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_13, deployment Perimeter, malware_family Win32_Gasti_tm, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_13;)