ET MALWARE Suspected Stitch Variant Backdoor CnC

Query · suricata

flow:established,to_server;
content:"|00 00 00 0f|stitch626hctits"; fast_pattern;
content:!"Referer|3a 20|";
content:!"User-Agent|3a 20|";
content:!"Connection|3a 20|";
content:!"Host|3a 20|";
content:!"Keep-Alive:|3a 20|";
Raw source ET MALWARE Suspected Stitch Variant Backdoor CnC · 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 any (
    msg:"ET MALWARE Suspected Stitch Variant Backdoor CnC";
    flow:established,to_server;
    content:"|00 00 00 0f|stitch626hctits"; fast_pattern;
    content:!"Referer|3a 20|";
    content:!"User-Agent|3a 20|";
    content:!"Connection|3a 20|";
    content:!"Host|3a 20|";
    content:!"Keep-Alive:|3a 20|";
    reference:url,securelist.com/holy-water-ongoing-targeted-water-holing-attack-in-asia/96311/;
    reference:md5,ec993ff561cbc175953502452bfa554a;
    classtype:command-and-control;
    sid:2029794; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2020_04_02, deployment Perimeter, malware_family Stitch, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_09;
)

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