alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Likely APT29 Retrieving Payload Embedded In PNG 2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".png"; endswith; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|MSIE 10.0|3b 20|Windows NT 6.1|3b 20|Trident/6.0)"; fast_pattern; bsize:64; http.protocol; content:"HTTP/1.1"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; content:!"Pragma|0d 0a|"; content:!"Cache-Control|0d 0a|"; reference:url,researchcenter.paloaltonetworks.com/2016/09/unit42-the-dukes-rd-finds-a-new-anti-analysis-technique/; classtype:targeted-activity; sid:2044213; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_09_08, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2023_02_16, former_sid 2822055;)