ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/images/L._SX2_.jpg"; bsize:19;
http.host;
content:"static.mhysl.org"; bsize:24; fast_pattern;
http.user_agent;
content:"Mozilla/5.0|20|(Windows|20|NT|20|6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0)|20|like|20|Gecko"; bsize:68;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Cobalt Strike Activity (GET) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/images/L._SX2_.jpg"; bsize:19;
    http.host;
    content:"static.mhysl.org"; bsize:24; fast_pattern;
    http.user_agent;
    content:"Mozilla/5.0|20|(Windows|20|NT|20|6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0)|20|like|20|Gecko"; bsize:68;
    http.header_names;
    content:!"Referer";
    reference:url,www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/new-apt-group-chamelgang/;
    classtype:trojan-activity;
    sid:2034082; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_10_01, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_10_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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