Win.Trojan.NeutrinoBot

[Y M <snort () outlook com>]

Hello,

The below rules were derived from the reference article. Reviewing the existing signature sid:32670, it may hit on the 
initial outbound connection. Subsequent traffic may not trigger the rule given the HTTP headers differences. No pcap is 
available for this one. If these rules seem redundant, please ignore them.

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.NeutrinoBot initial outbound 
connection"; flow:to_server,established; content:"POST"; http_method; content:"/tasks.php"; fast_pattern:only; 
http_uri; content:"Cookie|3A 20|auth="; http_header; content:"ZW50ZXI="; http_client_body; content:!"Connection"; 
http_header; content:!"Accept"; http_header; metadata:ruleset community, service http; 
reference:url,blog.malwarebytes.com/threat-analysis/2017/02/new-neutrino-bot-comes-in-a-protective-loader/; 
reference:url,www.virustotal.com/en/file/45abc50e837a3e0c4df842fe8c3aa54e103d690d67f89d78059878bd3acc67ab/analysis/; 
classtype:trojan-activity; sid:1000873; rev:1;)

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC Win.Trojan.NeutrinoBot success inbound 
connection"; flow:to_client,established; content:"404"; http_stat_code; file_data; content:"<!---c3VjY2Vzcw==--->"; 
metadata:ruleset community, service http; 
reference:url,blog.malwarebytes.com/threat-analysis/2017/02/new-neutrino-bot-comes-in-a-protective-loader/; 
reference:url,www.virustotal.com/en/file/45abc50e837a3e0c4df842fe8c3aa54e103d690d67f89d78059878bd3acc67ab/analysis/; 
classtype:trojan-activity; sid:1000874; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.NeutrinoBot outbound connection"; 
flow:to_server,established; content:"POST"; http_method; content:"/tasks.php"; fast_pattern:only; http_uri; 
content:"Cookie|3A 20|auth="; http_header; content:"Connection|3A 20|close|0D 0A|"; http_header; 
content:"|20|form-data|3B|name=|22|fname|22|"; content:"|20|form-data|3B 20|name=|22|data|22|"; content:!"Accept"; 
http_header; content:!"Referer"; http_header; metadata:ruleset community, service http; 
reference:url,blog.malwarebytes.com/threat-analysis/2017/02/new-neutrino-bot-comes-in-a-protective-loader/; 
reference:url,www.virustotal.com/en/file/45abc50e837a3e0c4df842fe8c3aa54e103d690d67f89d78059878bd3acc67ab/analysis/; 
classtype:trojan-activity; sid:1000875; rev:1;)

Thanks.
YM

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