alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED DRIVEBY Blackhole - Payload Download - calc.exe"; flow:established,from_server; content:"attachment|3b|"; http_header; content:"calc."; http_header; distance:0; fast_pattern; content:"|0d 0a|"; http_header; within:6; pcre:"/attachment\x3b[^\r\n]*?calc\.(dll|exe)[\x22\x27]?\r?$/Hmi"; classtype:bad-unknown; sid:2014237; rev:7; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Any, attack_target Client_Endpoint, created_at 2012_02_18, deployment Perimeter, malware_family Blackhole, signature_severity Critical, tag DriveBy, tag Blackhole, tag Exploit_Kit, updated_at 2019_07_26;)