ET MALWARE Sage Ransomware Checkin

Query · suricata

flow:established,from_server;
flowbits:isset,ET.Sage.Primer;
http.header;
content:"Content-Length|3a 20|1|0d 0a|";
file.data;
content:"k"; within:1; endswith;

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 Sage Ransomware Checkin · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Sage Ransomware Checkin";
    flow:established,from_server;
    flowbits:isset,ET.Sage.Primer;
    http.header;
    content:"Content-Length|3a 20|1|0d 0a|";
    file.data;
    content:"k"; within:1; endswith;
    reference:url,isc.sans.edu/forums/diary/Sage+20+Ransomware/21959;
    classtype:command-and-control;
    sid:2023767; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_25, deployment Perimeter, malware_family Ransomware, malware_family Sage, confidence High, signature_severity Major, tag Ransomware, updated_at 2020_09_14, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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