Re: Backdoor OSCelestial 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.

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

Sincerely,

Tyler Montier
Cisco Talos

On Mon, Mar 6, 2017 at 6:06 AM, Y M <snort () outlook com> wrote:

> Hello,
>
>
> The below rules are for the OSCelestial RAT. I left the OS (Win, Osx,
> etc.) at the beginning of the rules' messages since the sample in
> question seems to be targeting multiple OSes. The sample was successfully
> tested on Windows, OS X, and Linux (Ubuntu). Other OSes were not tested.
>
>
> The last rule may be an overkill but the pattern was obvious to be missed
> out. Pcap is available.
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE-CNC
> Backdoor.OSCelestial variant outbound connection";
> flow:to_server,established; content:"|70 73 72 00|"; content:"|17|com.net.LoginDataPacket";
> distance:0; within:24; metadata:ruleset community; reference:url,
> www.virustotal.com/en/file/9b4843ff0181af15a6c8478ca00aaf
> d4296592a2985a480575810f4f64442742/analysis/; classtype:trojan-activity;
> sid:1000867; rev:1;)
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE-CNC
> Backdoor.OSCelestial variant outbound connection";
> flow:to_server,established; content:"|70 73 72 00|"; content:"|11|com.net.LoginData";
> distance:0; within:18; content:"|0E|identification";
> content:"|08|maccaddr"; distance:7; within:9;
> content:"|0F|operatingsystem"; distance:7; within:16; content:"|06|pcname";
> distance:7; within:7; content:"|08|username"; distance:7; within:9;
> content:"|07|version"; distance:7; within:8; metadata:ruleset community;
> reference:url,www.virustotal.com/en/file/9b4843ff0181af15a6c8478ca00aaf
> d4296592a2985a480575810f4f64442742/analysis/; classtype:trojan-activity;
> sid:1000868; rev:1;)
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE-CNC
> Backdoor.OSCelestial variant inbound connection";
> flow:to_client,established; dsize:>800; content:"|1B|com.net.DynamicPluginPacket";
> fast_pattern:only; content:"|00 14|com.oscp.client.HRDP"; content:"|00
> 26|net.oscp.client.networking.OpenWebsite"; content:"|00 28|";
> distance:1; content:".UploadExecute"; distance:25; within:15; content:"|00
> 27|"; distance:1; content:".ReverseProxy"; distance:25; within:14;
> content:"|00 2A|"; distance:1; content:".DownloadExecute"; distance:25;
> within:17; content:"|00 29|"; distance:1; content:".KeystrokeLogger";
> distance:24; within:17; content:"|00 27|"; distance:1;
> content:".JarInjector"; distance:26; within:13; content:"|00 2B|";
> distance:1; content:".JarInjectUpload"; distance:26; within:17;
> content:"|00 21|"; distance:1; content:".Explorer"; distance:24; within:10;
> content:"|00 25|"; distance:1; content:".RemoteChat"; distance:25;
> within:12; content:"|00 25|"; distance:1; content:".MessageBox";
> distance:25; within:12; content:"|00 23|"; distance:1;
> content:".DesktopView"; distance:22; within:13; content:"|00 29|";
> distance:1; content:".PasswordRecovery"; distance:23; within:18;
> content:"|00 21|"; distance:1; content:".WebcamView"; distance:21;
> within:12; content:"|00 27|"; content:".Terminal"; distance:23; within:10;
> metadata:ruleset community; reference:url,www.virustotal.com/en/file/
> 9b4843ff0181af15a6c8478ca00aafd4296592a2985a480575810f4f64442742/analysis/;
> classtype:trojan-activity; sid:1000869; rev:1;)
>
> Thank you.
>
> YM
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> Snort-sigs mailing list
> Snort-sigs () lists sourceforge net
> https://lists.sourceforge.net/lists/listinfo/snort-sigs
>
> http://www.snort.org
>
> Please visit http://blog.snort.org for the latest news about Snort!
>
> Visit the Snort.org to subscribe to the official Snort ruleset, make sure
> to stay up to date to catch the most <a href="
> https://snort.org/downloads/#rule-downloads";>emerging threats</a>!
------------------------------------------------------------------------------
Announcing the Oxford Dictionaries API! The API offers world-renowned
dictionary content that is easy and intuitive to access. Sign up for an
account today to start using our lexical data to power your apps and
projects. Get started today and enter our developer competition.
http://sdm.link/oxford

_______________________________________________
Snort-sigs mailing list
Snort-sigs () lists sourceforge net
https://lists.sourceforge.net/lists/listinfo/snort-sigs

http://www.snort.org

Please visit http://blog.snort.org for the latest news about Snort!

Visit the Snort.org to subscribe to the official Snort ruleset, make sure to stay up to date to catch the most <a 
href=" https://snort.org/downloads/#rule-downloads";>emerging threats</a>!