ET MALWARE ContEXE Stealer Data Exfiltration Attempt M1

Query · suricata

flow:established,to_server;
xbits:isset,ET.ContEXE_Stealer,track ip_pair;
http.method;
content:"PUT";
http.uri;
content:"/v1/backup/"; startswith;
pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}\x22/R";
content:"/part|3f|name|3d|"; fast_pattern;
pcre:"/^(?:apps|Apps\x5fEdge|Browser\x5fcookies)/R";
http.request_body;
content:"PK|03 04|"; startswith;
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE ContEXE Stealer Data Exfiltration Attempt M1 · 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 ContEXE Stealer Data Exfiltration Attempt M1";
    flow:established,to_server;
    xbits:isset,ET.ContEXE_Stealer,track ip_pair;
    http.method;
    content:"PUT";
    http.uri;
    content:"/v1/backup/"; startswith;
    pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}\x22/R";
    content:"/part|3f|name|3d|"; fast_pattern;
    pcre:"/^(?:apps|Apps\x5fEdge|Browser\x5fcookies)/R";
    http.request_body;
    content:"PK|03 04|"; startswith;
    reference:md5,9c1d8a309c1ef2d781c5503cfcd96f53;
    reference:md5,ccfcb42c83ff8315662d54c560a2c8e2;
    classtype:trojan-activity;
    sid:2072372; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_10_06, deployment Perimeter, deployment SSLDecrypt, malware_family ContEXE_Stealer, performance_impact Low, confidence High, signature_severity Major, tag Stealer, updated_at 2026_10_06, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:src_ip;
)

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