Kaspersky Threats

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-Spy

Trojan-Spy programs are used to spy on a user’s actions (to track data entered by keyboard, make screen shots, retrieve a list of running applications, etc.) The harvested information is then transmitted to the malicious user controlling the Trojan. Email, FTP, the web (including data in a request) and other methods can be used to transmit the data.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Technical Details

Trojan.WebMoney.Wmpatch is a trojan program consisting of two executable Win32 PE-files: DBOLE.EXE and SICKBOY.EXE.These files are downloaded by the trojan program TrojanDownloader.Win32.Small.n. A mass mailing of this trojan program was detected on March 5th, 2003. Message text appears as follows:

From: Greeting cards [greeting_cards@yahoo.com]
Sent: 5 March 2003 8:20 (actual text on this line is in Russian)
To: Ivan Petrov
Subject: You have received a card! (actual text on this line is in Russian)

(Seen here is Russian text analagous to the the text in English just below.)

Hello! 

You've got a postcard! 
To view this postcard, click on the link: http://www.yahoo-greeting-cards.com/*************/viewcard_680fe23d52.asp.scr 

You will be able to see it at anytime within the next 60 days. 

____________________________________________________ 
Favorite postcards on http://www.yahoo-greeting-cards.com

File - DBOLE.EXE
This file is compressed with the PE-Pack utility. It's compressed size is 32,768 bytes and is written in the C programming language. Once the trojan is launched it checks for the presence of the WebMoney program. To do this it looks for the file WMClient.dll in the programs folder and inserts into it new code. The new code creates two files:

c:wmkey.bin c:wmmem.bin

The program creates a report file under the name:

c:wmlog.bin

Next the Trojan installs itself into the Windows registry auto-run key.
The following strings are contained within the file:

kernel32.dll rock the block c:wmkey.bin c:wmmem.bin CreateFileA WriteFile CloseHandle lstrlen CopyFileA DatabaseOLE false SoftwareMicrosoftWindowsCurrentVersionRun Command line: '%s' - Memory allocation failed + Shutting down - Bad file version - File writing error + File written + Prepare to patch + Entry point at %d (%x) + Patch at %d (%x) + Reading ok, %d bytes read - Error reading file + Memory allocation ok File size: %d bytes + Open file ok - WM not installed - Error opening file Patching: %s + Get path ok %s + Starting WMClient.dll SoftwareWebmoneyPath %s c:wmlog.bin

File - SICKBOY.EXE
This file is compressed with the PE-Pack utility, It's compressed size is 28,672 bytes and is written in the C programming language. Upon being launched, this file stays in a victim computer's memory and sends out the following files via email:

"c:wmlog.bin", "c:wmmem.bin", "c:wmkey.bin"

They are sent to the address:

sickboy@centrum.cz

So this program can connect itself to the SMTP server and to form email text it converts binary files into text format.
The file conatains the following strings:

xfm1.txt RegisterServiceProcess kernel32.dll c:wmkey.bin c:wmmem.bin c:wmlog.bin WebMoney Keeper QUIT Subject: %s DATA RCPT TO: MAIL FROM: HELO localhost 62.84.131.172 SOFTWAREWebmoneyOptions file not found Filename plain text: %s %.2x Filename bin: %s

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