[Snort-sigs] Win.Trojan.Isg

Tyler Montier tmontier at ...435...
Wed Feb 22 16:12:51 EST 2017


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

Since you have pcaps available, can you send them my way?


Tyler Montier
Cisco Talos

On Wed, Feb 22, 2017 at 3:22 PM, Y M <snort at ...3751...> wrote:

> Hello,
> This one is either detected as Zeus or Fareit by AV (because of the
> /gate.php...?). However, the host and network profiles/behavior do not
> match either, as far as I know. I used Yara to help with this and still no
> luck. It is somehow similar to sid:41442 yet different. So I went ahead and
> called it "Isg" based on the HTTP responses. Please feel free in naming
> this one, or if any has seen this traffic before, please do let us know.
> Additional details and pcaps are available.
> Win.Trojan.Isg getconfig request"; flow:to_server,established;
> content:"POST"; http_method; content:"/gate.php"; fast_pattern:only;
> http_uri; content:"WebKitFormBoundary"; http_header;
> content:"|20|form-data|3B 20|name=|22|getconfig|22|"; content:"Referer|3A
> 20|"; http_header; content:"Connection|3A 20|close|0D 0A|"; http_header;
> content:!"Accept"; http_header; metadata:ruleset community, service http;
> classtype:trojan-activity; sid:1000851; rev:1;)
> Win.Trojan.Isg getconfig response"; flow:to_client,established; file_data;
> content:"IS_G_PWDS:"; content:"IS_G_DOUBLE:"; content:"IS_G_BROWSERS:";
> content:"IS_G_COINS:"; content:"IS_G_SKYPE"; content:"IS_G_STEAM:";
> content:"IS_G_DESKTOP"; metadata:ruleset community, service http;
> classtype:trojan-activity; sid:1000852; rev:1;)
> Thanks.
> YM
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