alert http any any -> any any (msg:"ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M1 (set) M2"; flow:established,to_server; flowbits:isnotset,ET.slightpulse; flowbits:noalert; flowbits:set,ET.slightpulseM1; http.method; content:"POST"; http.request_body; content:"md5="; startswith; content:"&cert="; fast_pattern; distance:16; 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:2032909; rev:1; 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;)