ET INFO ScreenConnect/ConnectWise Initial Checkin Packet M3

Query · suricata

dsize:<600;
stream_size:server,<,5;
content:"|87 12 10 00 00 00 00 00 00 00 00 00 00 00 00 00|"; startswith; fast_pattern;
content:"|01|"; distance:7; within:1;
byte_jump:1,0,relative;
content:"|01|"; within:1;
target:src_ip;
Raw source ET INFO ScreenConnect/ConnectWise Initial Checkin Packet M3 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp [$HOME_NET,$HTTP_SERVERS] any -> any any (
    msg:"ET INFO ScreenConnect/ConnectWise Initial Checkin Packet M3";
    dsize:<600;
    stream_size:server,<,5;
    content:"|87 12 10 00 00 00 00 00 00 00 00 00 00 00 00 00|"; startswith; fast_pattern;
    content:"|01|"; distance:7; within:1;
    byte_jump:1,0,relative;
    content:"|01|"; within:1;
    reference:md5,2a90199b9386d9aafbab41a7972398c9;
    classtype:misc-activity;
    sid:2048143; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_09_21, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Informational, tag RemoteAccessTool, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_21, reviewed_at 2023_09_21;
    target:src_ip;
)

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