alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.Win32.VBKrypt.cugq/Umbra Checkin"; flow:established,to_server; http.method; content:"POST"; nocase; http.uri; content:"/bot.php"; nocase; fast_pattern; endswith; http.request_body; content:"mode="; nocase; pcre:"/^\d/Ri"; http.header_names; content:!"Referer"; content:!"Accept"; reference:url,securelist.com/en/descriptions/10316591/Trojan.Win32.VBKrypt.cugq; reference:url,mcafee.com/threat-intelligence/malware/default.aspx?id=456326; reference:url,sophos.com/en-us/threat-center/threat-analyses/viruses-and-spyware/Troj~Agent-RDK/detailed-analysis.aspx; reference:md5,a95dacba360e45fc03769ea55c546a7b; reference:url,arbornetworks.com/asert/2014/06/the-best-of-both-worlds-soraya; classtype:command-and-control; sid:2018518; rev:10; metadata:created_at 2011_04_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_15;)