ET MALWARE MSIL/Kryptik.XSY Data Exfil via SMTP

Query · suricata

flow:established,to_server;
content:"|0d 0a|Subject: PW_";
content:"filename|3d 22|PW_";
content:"_"; distance:0;
content:"_"; distance:4; within:1;
content:"_"; distance:2; within:1;
content:"_"; distance:2; within:1;
content:"_"; distance:2; within:1;
content:"_"; distance:2; within:1;
content:".html|22 0d 0a 0d 0a|VGltZTog"; distance:2; within:18; fast_pattern;
Raw source ET MALWARE MSIL/Kryptik.XSY Data Exfil via SMTP · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/Kryptik.XSY Data Exfil via SMTP";
    flow:established,to_server;
    content:"|0d 0a|Subject: PW_";
    content:"filename|3d 22|PW_";
    content:"_"; distance:0;
    content:"_"; distance:4; within:1;
    content:"_"; distance:2; within:1;
    content:"_"; distance:2; within:1;
    content:"_"; distance:2; within:1;
    content:"_"; distance:2; within:1;
    content:".html|22 0d 0a 0d 0a|VGltZTog"; distance:2; within:18; fast_pattern;
    reference:md5,61181c9665789225439d04d6eef5527f;
    classtype:command-and-control;
    sid:2030887; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_09_17, deployment Perimeter, malware_family MSIL_Kryptik_XSY, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.