ET MALWARE Win32/Screenshotter Backdoor CnC Activity (GET)

Query · suricata

flow:to_server,established;
urilen:15;
http.method;
content:"GET";
http.uri;
content:"-ds2"; endswith; fast_pattern;
pcre:"/^\/[0-9]{10}-ds2$/";
http.user_agent;
content:"AutoHotkey"; bsize:10;
http.header;
content:"Cache|2d|Control|3a 20|no|2d|cache";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Win32/Screenshotter Backdoor CnC Activity (GET) · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Screenshotter Backdoor CnC Activity (GET)";
    flow:to_server,established;
    urilen:15;
    http.method;
    content:"GET";
    http.uri;
    content:"-ds2"; endswith; fast_pattern;
    pcre:"/^\/[0-9]{10}-ds2$/";
    http.user_agent;
    content:"AutoHotkey"; bsize:10;
    http.header;
    content:"Cache|2d|Control|3a 20|no|2d|cache";
    http.header_names;
    content:!"Referer";
    reference:url,twitter.com/Unit42_Intel/status/1608567622856998912;
    classtype:trojan-activity;
    sid:2043240; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_09, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_Screenshotter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_09, reviewed_at 2025_10_24;
)

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