ET MALWARE Observed Karen Ransomware Powershell Loader

Query · suricata

http.method;
content:"GET";
http.uri;
content:"|2f|loader|2f|loader2.ps1"; fast_pattern;
http.host;
content:"karen|2e|"; startswith;
http.user_agent;
content:"Go|2d|http|2d|client";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Observed Karen Ransomware Powershell Loader · Suricata
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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 Observed Karen Ransomware Powershell Loader";
    http.method;
    content:"GET";
    http.uri;
    content:"|2f|loader|2f|loader2.ps1"; fast_pattern;
    http.host;
    content:"karen|2e|"; startswith;
    http.user_agent;
    content:"Go|2d|http|2d|client";
    http.header_names;
    content:!"Referer";
    reference:md5,f155ec35d67f746593ce8cc4e64d33e5;
    reference:url,twitter.com/fbgwls245/status/1427610307283677186;
    classtype:trojan-activity;
    sid:2033773; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_23, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_23, reviewed_at 2024_06_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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