[Snort-sigs] Win.Trojan.Kovtar

Tyler Montier tmontier at ...435...
Fri Feb 10 10:15:11 EST 2017


Dear Yaser,

Thanks for your submission. We will review and test the rules and get back
to you when they're finished.

Do you have any pcaps or hashes of the malware available?

Sincerely

Tyler Montier
Cisco Talos


On Fri, Feb 10, 2017 at 4:07 AM, Y M <snort at ...3751...> wrote:

> Hello,
>
>
> Below two signatures detect the initial JS downloader and post-infection
> C&C.
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC
> Win.Trojan.Kovter variant JS downloader outbound connection";
> flow:to_server,established; urilen:<100; content:"GET"; http_method;
> content:"/counter/?"; fast_pattern:only; http_uri; content:"UA-CPU|3A 20|";
> http_header; content:"MSIE 7.0|3B|"; http_header; content:!"Referer";
> http_header; pcre:"/\/counter\/\x3f\w+/U"; metadata:ruleset community,
> service http; classtype:trojan-activity; sid:1000821; rev:1;)
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC
> Win.Trojan.Kovter variant outbound connection"; flow:to_server,established;
> dsize:55<>205; content:!" HTTP/"; content:"|00 00 00|"; offset:1;
> metadata:ruleset community; classtype:trojan-activity; sid:1000822; rev:1;)
>
> Thank you.
>
> YM
>
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