alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (Safebrowse Profile) POST"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/safebrowsing/rd/"; startswith; http.accept; bsize:63; content:"text/html,application/xhtml+xml,application/xml|3b|q=0.9,*/*|3b|q=0.8"; http.accept_lang; bsize:14; content:"en-US,en|3b|q=0.5"; http.accept_enc; bsize:13; content:"gzip, deflate"; http.cookie; content:"PREF=ID=U="; startswith; fast_pattern; pcre:"/^[a-z0-9]{10,}$/Rsi"; http.header_names; content:"|0d 0a|Accept-Language|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|Cookie|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; startswith; content:!"Referer"; reference:url,github.com/rsmudge/Malleable-C2-Profiles/blob/master/normal/safebrowsing.profile; classtype:command-and-control; sid:2030344; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_16, deployment Perimeter, malware_family Cobalt_Strike, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2024_04_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)