ET MALWARE CHERRYSPY.Backdoor Russia APT28 Key Exchange Response

Query · suricata

flow:established,to_client;
flowbits:isset,ET.CherrySpy.Backdoor.KeyExchange;
http.response_body;
content:"|22|TSK_KEY|22 3A|"; fast_pattern;
content:"|22|TSK_IV|22 3A|";
content:"|22|TSK_BODY|22 3A|";
target:dest_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 CHERRYSPY.Backdoor Russia APT28 Key Exchange Response · 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 CHERRYSPY.Backdoor Russia APT28 Key Exchange Response";
    flow:established,to_client;
    flowbits:isset,ET.CherrySpy.Backdoor.KeyExchange;
    http.response_body;
    content:"|22|TSK_KEY|22 3A|"; fast_pattern;
    content:"|22|TSK_IV|22 3A|";
    content:"|22|TSK_BODY|22 3A|";
    reference:url,go.recordedfuture.com/hubfs/reports/CTA-RU-2024-1121.pdf;
    reference:url,cert.gov.ua/article/4697016;
    classtype:trojan-activity;
    sid:2062549; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2025_05_22, deployment Perimeter, malware_family CHERRYSPY, performance_impact Low, confidence High, signature_severity Major, tag APT28, updated_at 2025_05_22, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:dest_ip;
)

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