ET MALWARE APT/Bitter CnC Exfiltration via TCP

Query · suricata

flow:established,to_server;
stream_size:client,<,200;
content:"|00|"; offset:1; depth:1;
content:"|00|"; distance:1; within:1;
pcre:"/(?:([a-zA-Z0-9]\0){10,})/R";
content:"XXXXXXXXX"; fast_pattern; endswith;
Raw source ET MALWARE APT/Bitter CnC Exfiltration via TCP · Suricata
Esc
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 1024: (
    msg:"ET MALWARE APT/Bitter CnC Exfiltration via TCP";
    flow:established,to_server;
    stream_size:client,<,200;
    content:"|00|"; offset:1; depth:1;
    content:"|00|"; distance:1; within:1;
    pcre:"/(?:([a-zA-Z0-9]\0){10,})/R";
    content:"XXXXXXXXX"; fast_pattern; endswith;
    reference:md5,71e1cfb5e5a515cea2c3537b78325abf;
    reference:url,twitter.com/RedDrip7/status/1536989979229835265;
    classtype:command-and-control;
    sid:2036996; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_15, deployment Perimeter, malware_family Bitter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_04, reviewed_at 2024_01_02;
)

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.