alert http any any -> any any (msg:"ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M2"; flow:established,to_client; flowbits:isset,ET.slightpulseM2; http.stat_code; content:"200"; http.content_type; content:"application/x-download"; bsize:22; http.header; content:"Content-Disposition|3a 20|attachment|3b 20|filename=tmp|0d 0a|"; fast_pattern; 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:trojan-activity; sid:2032912; rev:1; metadata:attack_target Server, created_at 2021_05_05, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_05;)