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;)