Re: Zebrocy family sigs

[Phillip Lee <phillile () 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,
Phil Lee
Cisco Talos

> On Apr 27, 2018, at 10:03 AM, Y M via Snort-sigs <snort-sigs () lists snort org> wrote:
>
> Hi,
>
> The below rules are based on the information provided by the reference. The traffic from the hashes listed below was 
> tested against the rules. Pcap are available.
>
> # Title: Sednit update: Analysis of Zebrocy
> # Reference: https://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/ 
> <https://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/>
> # Tests: pcap
> # Hashes: 54b14fc84f152b43c63babc46f2597b053e94627 (Delf Downloader), d379b94a3eb4fd9c9a973f64d436d7fc2e9d6762 
> (AutoIt Downloader), 4ccbe222bd97dc229b36efaf52520939da9d51c8 (Delf Backdoor), 
> cdf9c24b86bc9a872035dcf3f53f380c904ed98b (Delf Backdoor)
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zebrocy family Delphi downloader 
> outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"?fort="; fast_pattern:only; 
> http_uri; content:"pol="; http_client_body; content:"Accept-Encoding|3A 20|identity|0D 0A|"; http_header; 
> pcre:"/\.(php|dat)\x3ffort\x3d[A-Z0-9]{8,16}/U"; metadata:ruleset community, service http; 
> reference:url,www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/ 
> <http://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/>; classtype:trojan-activity; sid:8000022; 
> rev:1;)
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zebrocy family Delphi downloader 
> outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"/protocol.php"; 
> fast_pattern:only; http_uri; content:"porg="; http_client_body; content:!"User-Agent"; http_header; metadata:ruleset 
> community, service http; reference:url,www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/ 
> <http://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/>; classtype:trojan-activity; sid:8000023; 
> rev:1;)
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zebrocy family AutoIt downloader 
> outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"dbgate="; fast_pattern:only; 
> http_client_body; content:"win32="; http_client_body; metadata:ruleset community, service http; 
> reference:url,www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/ 
> <http://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/>; classtype:trojan-activity; sid:8000024; 
> rev:1;)
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zebrocy family Delphi backdoor 
> outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"Content-Disposition: 
> form-data|3B| name=|22|userfile|22 3B| filename=|22|"; fast_pattern:only; http_client_body; 
> content:"Accept-Encoding|3A 20|identity|0D 0A|"; http_header; metadata:ruleset community, service http; 
> reference:url,www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/ 
> <http://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/>; classtype:trojan-activity; sid:8000025; 
> rev:1;)
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zebrocy family bad known 
> user-agent"; flow:to_server,established; content:"User-Agent|3A 20|Mozilla v"; fast_pattern:only; http_header; 
> pcre:"/User-Agent\x3a\x20Mozilla\x20v[0-9]/Hi"; metadata:ruleset community, service http; 
> reference:url,www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/ 
> <http://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/>; classtype:trojan-activity; sid:8000026; 
> rev:1;)
>
> Thanks
> YM
>
>
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