alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY NSecSoft Remote Monitoring Update/Download Activity M2"; flow:established,to_server; stream_size:server,=,1; dsize:512; content:"MFjOLrqOLbmPnAKuM7cBwxcPgaqvM7cNcoZKIYmscocPnAOuM7jRJYJy2YBEmEORcoZKLSuscOByLFZL2rZunrfOrFqNJazEJ7GXgYNocF24J8EocoZOgST/Ja3sceRocazuJaOEIYsvnYNsce5ocxkV"; startswith; fast_pattern; reference:md5,9b9f3a3b03831b6f98ca1b935dd0eb51; classtype:bad-unknown; sid:2034178; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_10_12, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_12;)