[Snort-sigs] Win.Trojan.yty

Phillip Lee phillile at sourcefire.com
Wed Mar 28 14:29:07 EDT 2018


Dear Yaser,
These rules have been reviewed and added to the community ruleset (SID: 46066-46070).  I made several edits based on PCAPs I created during runtime of the different downloaders and based on additional static analysis of the binaries.

Submitted Rules:
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty second stage downloader initial outbound connection"; flow:to_server,established; content:"/football/goal"; fast_pattern:only; http_uri; content:"ball="; http_client_body; content:"score="; http_client_body; metadata:impact_flag red, policy balanced-ips drop, policy max-detect-ips drop, policy security-ips drop, ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/; classtype:trojan-activity; sid:46066; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty plugin downloader initial outbound connection"; flow:to_server,established; content:"Expect: 100-continue"; fast_pattern:only; http_header; content:"pc="; http_client_body; content:"pc_data="; http_client_body; metadata:impact_flag red, policy balanced-ips drop, policy max-detect-ips drop, policy security-ips drop, ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/; classtype:trojan-activity; sid:46067; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty module download request"; flow:to_server,established; content:"/football/download/"; depth:19; http_uri; content:!"User-Agent|3A|"; nocase; http_header; content:!"Accept|3A|"; nocase; http_header; metadata:impact_flag red, policy balanced-ips drop, policy max-detect-ips drop, policy security-ips drop, ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/; classtype:trojan-activity; sid:46068; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty module request"; flow:to_server,established; content:"Expect: 100-continue"; fast_pattern:only; http_header; content:"cnumber="; http_uri; content:"orname="; http_uri; metadata:impact_flag red, policy balanced-ips drop, policy max-detect-ips drop, policy security-ips drop, ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/; classtype:trojan-activity; sid:46069; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty file exfiltraion outbound request"; flow:to_server,established; content:"Expect: 100-continue"; fast_pattern:only; http_header; content:"id="; http_client_body; content:"pc="; http_client_body; metadata:impact_flag red, policy balanced-ips drop, policy max-detect-ips drop, policy security-ips drop, ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/; classtype:trojan-activity; sid:46070; rev:1;)

Thank you for your contribution.

Sincerely,
Phil Lee
Cisco Talos

> On Mar 14, 2018, at 2:46 PM, Phillip Lee <phillile at sourcefire.com> wrote:
> 
> Yaser,
> 
> Thanks for your submission. We will review the rules and get back to you when they're finished. 
> 
> Regards,
> Phil Lee
> Cisco Talos
> 
>> On Mar 14, 2018, at 2:38 PM, Y M via Snort-sigs <snort-sigs at lists.snort.org <mailto:snort-sigs at lists.snort.org>> wrote:
>> 
>> Hi 
>> 
>> The below rules are based of the research posted at the resource link. Unfortunately, no pcaps available.
>> 
>> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty initial outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"score=Name|3A|"; fast_pattern:only; http_client_body; content:">Caption|3A|"; http_client_body; content:">SerialNumber|3A|"; http_client_body; content:">VM|3A|"; http_client_body; metadata:ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/ <http://www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/>; classtype:trojan-activity; sid:9000043; rev:1;)
>> 
>> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty retrieve modules outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"pc="; http_client_body; content:"&whi="; http_client_body; fast_pattern:only; content:"&pc_data=<div class=|27|pcinfo|27|>"; http_client_body; metadata:ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/ <http://www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/>; classtype:trojan-activity; sid:9000044; rev:1;)
>> 
>> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.yty exfiltration outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"/file_upload?"; http_uri; fast_pattern:only; content:"status="; http_uri; content:"&path="; http_uri; content:"&pc="; http_uri; content:"&type="; http_uri; content:"&fname="; http_uri; content:"&cnumber="; http_uri; content:"&orname="; http_uri; content:"&ofid="; http_uri; metadata:ruleset community, service http; reference:url,www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/ <http://www.arbornetworks.com/blog/asert/donot-team-leverages-new-modular-malware-framework-south-asia/>; classtype:trojan-activity; sid:9000045; rev:1;)
>> 
>> Thanks.
>> YM
>> 
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