Re: Win.Trojan.Bitter RAT

[Tyler Montier <tmontier () sourcefire com>]

Yaser,

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

Can you send along the pcaps that you have?

Regards,
Tyler Montier
Cisco Talos

On Fri, Feb 2, 2018 at 10:35 AM, Y M via Snort-sigs <
snort-sigs () lists snort org> wrote:

> Hi,
>
>
> Below rules are for detecting two variants of the Bitter RAT. Pcaps for
> one variant only are available.
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC
> Win.Trojan.Bitter RAT variant outbound connection attempt";
> flow:to_server,established; content:"GET"; http_method;
> content:".php?TIe="; fast_pattern:only; http_uri; content:"Connection|3A
> 20|close|0D 0A|"; http_header; content:!"User-Agent"; http_header;
> content:!"Accept"; http_header; content:!"Referer"; http_header;
> metadata:ruleset community, service http; reference:url,community.rsa.
> com/community/products/netwitness/blog/2018/01/10/
> malspam-delivers-bitter-rat-07-01-2018; reference:url,community.rsa.
> com/thread/185482; reference:url,blogs.forcepoint.com/security-labs/
> bitter-targeted-attack-against-pakistan; classtype:trojan-activity;
> sid:9000021; rev:1;)
>
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.Bitter RAT variant inbound connection attempt";
> flow:to_client,established; file_data; content:"POF: #"; fast_pattern:only;
> content:"|0D 0A|SIZE: #"; content:"|0D 0A|SRE: #"; metadata:ruleset
> community, service http; reference:url,community.rsa.
> com/community/products/netwitness/blog/2018/01/10/
> malspam-delivers-bitter-rat-07-01-2018; reference:url,community.rsa.
> com/thread/185482; reference:url,blogs.forcepoint.com/security-labs/
> bitter-targeted-attack-against-pakistan; classtype:trojan-activity;
> sid:9000022; rev:1;)
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC
> Win.Trojan.Bitter RAT variant outbound connection attempt";
> flow:to_server,established; content:"GET"; http_method;
> content:".php?cId="; fast_pattern:only; http_uri; content:"&osInfo=";
> http_uri; content:"Connection|3A 20|close|0D 0A|"; http_header;
> content:!"User-Agent"; http_header; content:!"Accept"; http_header;
> content:!"Referer"; http_header; metadata:ruleset community, service http;
> reference:url,community.rsa.com/community/products/
> netwitness/blog/2018/01/10/malspam-delivers-bitter-rat-07-01-2018;
> reference:url,community.rsa.com/thread/185482; reference:url,blogs.
> forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan;
> reference:url,www.virustotal.com/#/file/bad124a847b10641214300317d3f17
> 06a025d57f779428f1fbcc7b4a3b2e9160/detection; classtype:trojan-activity;
> sid:9000023; rev:1;)
>
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.Bitter RAT variant inbound connection attempt";
> flow:to_client,established; file_data; content:"EXE: #"; fast_pattern:only;
> content:"SIZE: #"; metadata:ruleset community, service http; reference:url,
> community.rsa.com/community/products/netwitness/blog/2018/01/10/
> malspam-delivers-bitter-rat-07-01-2018; reference:url,community.rsa.
> com/thread/185482; reference:url,blogs.forcepoint.com/security-labs/
> bitter-targeted-attack-against-pakistan; reference:url,www.virustotal.
> com/#/file/bad124a847b10641214300317d3f1706a025d57f779428f1fbcc7b4a3b2e
> 9160/detection; classtype:trojan-activity; sid:9000024; rev:1;)
>
>
> Thanks.
>
> Yaser
>
>
>
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href=" https://snort.org/downloads/#rule-downloads";>emerging threats</a>!