ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M2 (set) M1

alert http any any -> any any (
    msg:"ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M2 (set) M1";
    flow:established,to_server;
    flowbits:isnotset,ET.slightpulseM2;
    flowbits:noalert;
    flowbits:set,ET.slightpulseM2;
    http.method;
    content:"POST";
    http.request_body;
    content:"img="; startswith; fast_pattern;
    content:"&name=";
    reference:url,github.com/fireeye/pulsesecure_exploitation_countermeasures;
    reference:url,www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html;
    classtype:command-and-control;
    sid:2032910; rev:3;
    metadata:attack_target Server, created_at 2021_05_05, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_05;
)