alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Agent.AAIB Variant CnC"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".jpg"; endswith; http.user_agent; content:"WinHttpClient"; bsize:13; http.header_names; content:"|0d 0a|Connection|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; fast_pattern; reference:md5,0e3b41da52382744e5b2c1c38be00f04; reference:url,www.blackberry.com/content/dam/blackberry-com/asset/enterprise/pdf/direct/report-bb-decade-of-the-rats.pdf; classtype:command-and-control; sid:2029893; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_04_13, deployment Perimeter, malware_family Win32_Agent_AAIB, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_16;)