ET MALWARE Possible Inbound PowerShell via Invoke-PSImage Stego

Query · suricata

flow:established,to_client;
file_data;
content:"|89 50 4e 47|"; depth:8;
content:"c2FsIGEgTmV3LU9iamVjdDt"; within:75; fast_pattern;
Raw source ET MALWARE Possible Inbound PowerShell via Invoke-PSImage Stego · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible Inbound PowerShell via Invoke-PSImage Stego";
    flow:established,to_client;
    file_data;
    content:"|89 50 4e 47|"; depth:8;
    content:"c2FsIGEgTmV3LU9iamVjdDt"; within:75; fast_pattern;
    reference:url,github.com/peewpw/Invoke-PSImage/blob/master/Invoke-PSImage.ps1;
    classtype:trojan-activity;
    sid:2027085; rev:2;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2019_03_18, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Minor, updated_at 2020_08_19;
)

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.