alert http $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE Win32/Qakbot CnC Activity (POST)"; flow:to_server,established; urilen:3; http.method; content:"POST"; http.uri; content:"/t5"; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|WOW64|3b 20|Trident|2f|7|2e|0|3b 20|Touch|3b 20|rv|3a|11|2e|0|29 20|like|20|Gecko"; bsize:76; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.header_names; content:!"Referer"; http.accept; content:"application|2f|x|2d|shockwave|2d|flash|2c 20|image|2f|gif|2c 20|image|2f|jpeg|2c 20|image|2f|pjpeg|2c 20 2a 2f 2a|"; bsize:70; fast_pattern; reference:url,blog.eclecticiq.com/qakbot-malware-used-unpatched-vulnerability-to-bypass-windows-os-security-feature; classtype:trojan-activity; sid:2043333; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_18, deployment Perimeter, malware_family Win32_Qakbot, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_18, reviewed_at 2025_10_24;)