ET MALWARE Win32/BlackCarat XORed (0x77) CnC Checkin

Query · suricata

flow:established,to_server;
dsize:>800;
content:"|77 77|"; offset:2; depth:2;
content:"|77|"; distance:1; within:1;
content:"|77 77 77 77 77 77 77 77 77 77 77 77 77|"; distance:1; within:13;
content:"|20 77 1e 77 19 77 13 77 18 77 00 77 04|"; distance:0; fast_pattern;
content:!"|00 00 00 00 00 00|";
Raw source ET MALWARE Win32/BlackCarat XORed (0x77) CnC Checkin · 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 !80 -> $EXTERNAL_NET [!25,!445,!1500] (
    msg:"ET MALWARE Win32/BlackCarat XORed (0x77) CnC Checkin";
    flow:established,to_server;
    dsize:>800;
    content:"|77 77|"; offset:2; depth:2;
    content:"|77|"; distance:1; within:1;
    content:"|77 77 77 77 77 77 77 77 77 77 77 77 77|"; distance:1; within:13;
    content:"|20 77 1e 77 19 77 13 77 18 77 00 77 04|"; distance:0; fast_pattern;
    content:!"|00 00 00 00 00 00|";
    reference:md5,514AB639CD556CEBD78107B4A68A202A;
    reference:url,www.virusbulletin.com/uploads/pdf/conference_slides/2018/AncelKuprins-VB2018-WolfSheep.pdf;
    classtype:command-and-control;
    sid:2026525; rev:7;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_18, deployment Perimeter, malware_family BlackCarat, performance_impact Low, confidence High, signature_severity Major, tag RAT, updated_at 2019_07_26;
)

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