Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (Safebrowse Profile) GET"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/safebrowsing/rd/"; fast_pattern; depth:17; http.accept; content:"text/html,application/xhtml+xml,application/xml|3b|q=0.9,*/*|3b|q=0.8"; bsize:63; http.accept_lang; content:"en-US,en|3b|q=0.5"; bsize:14; http.accept_enc; content:"gzip, deflate"; bsize:13; http.cookie; bsize:264; content:"PREF=ID="; depth:8; pcre:"/^[a-z]{256}$/R"; 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|"; depth:70; content:!"Referer"; http.host; content:!"google.com"; endswith; reference:url,github.com/rsmudge/Malleable-C2-Profiles/blob/master/normal/safebrowsing.profile; classtype:command-and-control; sid:2030347; rev:3; 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, performance_impact Significant, confidence Medium, signature_severity Major, updated_at 2024_04_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)