ET MALWARE Base64 Encoded Windows Command Prompt (Outbound)

Query · suricata

flow:established,to_server;
content:"TWljcm9zb2Z0IFdpbmRvd3MgW1ZlcnNpb24"; fast_pattern;
pcre:"/(?:TWljcm9zb2Z0IENvcnBvcmF0aW9uL|1pY3Jvc29mdCBDb3Jwb3JhdGlvbi|NaWNyb3NvZnQgQ29ycG9yYXRpb24u)[a-zA-Z0-9\x2f\x2b]{25,35}(?:Cg0KQzpc|oNCkM6XD|KDQpDOlw\x2b)/R";
Raw source ET MALWARE Base64 Encoded Windows Command Prompt (Outbound) · 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 tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Base64 Encoded Windows Command Prompt (Outbound)";
    flow:established,to_server;
    content:"TWljcm9zb2Z0IFdpbmRvd3MgW1ZlcnNpb24"; fast_pattern;
    pcre:"/(?:TWljcm9zb2Z0IENvcnBvcmF0aW9uL|1pY3Jvc29mdCBDb3Jwb3JhdGlvbi|NaWNyb3NvZnQgQ29ycG9yYXRpb24u)[a-zA-Z0-9\x2f\x2b]{25,35}(?:Cg0KQzpc|oNCkM6XD|KDQpDOlw\x2b)/R";
    reference:url,twitter.com/RedDrip7/status/1537389704374431744;
    reference:md5,29b6b195cf0671901b75b7d2ac6814f6;
    classtype:command-and-control;
    sid:2037018; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_06_16, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_16;
)

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