alert http1 $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Karagany/Kazy Obfuscated Payload Download"; flow:established,to_client; http.header; content:"Content-Disposition|3a 20|"; content:"windows-update-"; fast_pattern; within:100; content:".exe|0d 0a|"; within:100; http.response_body; content:!"MZ"; depth:2; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=TrojanDownloader%3AWin32%2FKaragany.I; reference:url,www.virustotal.com/file/6c7ae03b8b660826f0c58bbec4208bf03e704201131b3b5c5709e5837bfdd218/analysis/1334672726/; classtype:trojan-activity; sid:2014230; rev:7; metadata:created_at 2012_02_16, signature_severity Major, updated_at 2024_04_08, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;)