alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE UNC2628 Malicious MSHTA Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ID-508260156241"; bsize:16; fast_pattern; http.header_names; content:!"Referer"; reference:url,www.fireeye.com/blog/threat-research/2021/06/darkside-affiliate-supply-chain-software-compromise.html; classtype:trojan-activity; sid:2033151; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_17;)