alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Suspicious IAT GetComputerName"; flow:established,to_client; content:"MZ"; isdataat:76,relative; content:"This program cannot be run in DOS mode."; distance:0; content:"GetComputerName"; nocase; fast_pattern:only; reference:url,sans.org/reading_room/whitepapers/malicious/rss/_33649; classtype:misc-activity; sid:2012766; rev:6; metadata:created_at 2011_05_03, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_23;)