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;)