alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Modi RAT CnC Checkin (DesktopPreview)"; flow:established,to_server; content:"DesktopPreview|7c 7c|"; depth:16; fast_pattern; isdataat:1000,relative; reference:md5,ca075cb808eb6f69ab5ea82d7acb3f39; classtype:command-and-control; sid:2029698; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_23, deployment Perimeter, malware_family ModiRAT, confidence High, signature_severity Major, updated_at 2020_03_23;)