[Snort-sigs] Win.Ransomware.Sage

Tyler Montier tmontier at ...435...
Fri Feb 10 10:23:06 EST 2017


Dear Yaser,

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

Do you have any pcaps or hashes available?

Sincerely

Tyler Montier
Cisco Talos


On Fri, Feb 10, 2017 at 4:12 AM, Y M <snort at ...3751...> wrote:

> Hello,
>
>
> This one for Sage "2.0" ransomware performing its post-infection C&C.
> There are several samples circulating. I have seen references mentioning
> that Sage is a variant of CryLocker, but some of the samples generate the
> same UDP traffic observed from Cerber. The ransom notes also resembles that
> of Cerber.
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC
> Win.Ransomware.Sage variant outbound connection";
> flow:to_server,established; urilen:1; content:"POST"; http_method;
> content:" / HTTP/1."; content:"Connection|3A 20|close|0D 0A|";
> fast_pattern:only; http_header; content:"Content-Length|3A 20|";
> http_raw_header; byte_test:3,>,160,0,string,dec,relative;
> byte_test:3,<,170,0,string,dec,relative; content:!"User-Agent";
> http_header; content:!"Accept"; http_header; content:!"Referer";
> http_header; metadata:ruleset community, service http;
> classtype:trojan-activity; sid:1000824; rev:1;)
>
>
> Thank you.
>
> YM
>
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