Re: Win.Trojan.KopiLuwak Turla JS

[Tyler Montier <tmontier () sourcefire com>]

Yaser,

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

Sincerely,

Tyler Montier
Cisco Talos

On Tue, Feb 14, 2017 at 5:30 AM, Y M <snort () outlook com> wrote:

> Hello,
>
>
> The below signatures were derived from the article in the reference. Since
> there are no pcaps available, the below assumptions/thoughts were made.
>
>
> 1. For the first rule, it is assumed that the custom User-Agent ends with
> \x0d\x0a. It also may be a better idea to have the pcre as
> "[A-Z0-9a-z]{32}", but it written to avoid ambi
>
> 2. To avoid pcre, individual signatures were created per HTTP response.
> Perhaps it is better to combine all of them with pcre.
>
> 3. The HTTP response body does not end/contain any line terminators.
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALAWARE-CNC
> Win.Trojan.KopiLuwak JS outbound request"; flow:to_server,established;
> content:"POST"; http_method; content:".php"; http_uri; content:"Mozilla/5.0
> (Windows NT 6.1|3B| Win64|3B| x64)|3B| "; fast_pattern:only; http_header;
> pcre:"/[0-9]{16}[A-Z0-9a-z]{16}\x0d\x0a$/mR";
> flowbits:set,kopiluwak.js.out; flowbits:noalert; metadata:ruleset
> community, service http; reference:url,securelist.com/
> blog/research/77429/kopiluwak-a-new-javascript-payload-from-turla/;
> classtype:trojan-activity; sid:1000828; rev:1;)
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.KopiLuwak JS inbound response"; flow:to_client,established;
> flowbits:isset,kopiluwak.js.out; content:"Content-Length|3A 20|4|0D 0A|";
> http_header; file_data; content:"good"; depth:4; isdataat:!0,relative;
> metadata:ruleset community, service http; reference:url,securelist.com/
> blog/research/77429/kopiluwak-a-new-javascript-payload-from-turla/;
> classtype:trojan-activity; sid:1000829; rev:1;)
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.KopiLuwak JS inbound response"; flow:to_client,established;
> flowbits:isset,kopiluwak.js.out; content:"Content-Length|3A 20|4|0D 0A|";
> http_header; file_data; content:"exit"; depth:4; isdataat:!0,relative;
> metadata:ruleset community, service http; reference:url,securelist.com/
> blog/research/77429/kopiluwak-a-new-javascript-payload-from-turla/;
> classtype:trojan-activity; sid:1000830; rev:1;)
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.KopiLuwak JS inbound response"; flow:to_client,established;
> flowbits:isset,kopiluwak.js.out; content:"Content-Length|3A 20|4|0D 0A|";
> http_header; file_data; content:"work"; depth:4; isdataat:!0,relative;
> metadata:ruleset community, service http; reference:url,securelist.com/
> blog/research/77429/kopiluwak-a-new-javascript-payload-from-turla/;
> classtype:trojan-activity; sid:1000831; rev:1;)
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.KopiLuwak JS inbound response"; flow:to_client,established;
> flowbits:isset,kopiluwak.js.out; content:"Content-Length|3A 20|4|0D 0A|";
> http_header; file_data; content:"fail"; depth:4; isdataat:!0,relative;
> metadata:ruleset community, service http; reference:url,securelist.com/
> blog/research/77429/kopiluwak-a-new-javascript-payload-from-turla/;
> classtype:trojan-activity; sid:1000832; rev:1;)
>
> Thanks.
>
> YM
>
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