Overview
This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.
|
Minimum DAT
5389 (2008-09-22) Updated DAT5389 (2008-09-22) |
Minimum Engine
5.3.00 File Length619389 |
Description Added
2008-09-23 Description Modified2008-09-23 |
Malware Proliferation
Characteristics
| File Property | Property Value |
|---|---|
| FileName | Unavailable |
| McAfee Detection | BackDoor-DSA |
| Length | 619,389 bytes |
| CRC | D81A24B1 |
| MD5 | e2dc1dcda96e9492149f73b2c6d30728 |
| SHA1 | 19C3D9002EEC3D6BEA0B0F3983542598959A0263 |
Avert® Labs has observed the following system activities:
| Activity | Risk Level |
|---|---|
| Enumerates running processes | Medium |
| Writes executable in the windows folder | Low |
| Creates registry keys and data values to persist on OS reboot | Informational |
| Registers DLLs | Informational |
Other detections that have been observed.
| FileName | McAfee Supported |
|---|---|
| %WINDIR%\system32\concp32.exe | BackDoor-DSA |
| %WINDIR%\system32\vcl32.exe | BackDoor-DSA |
| %WINDIR%\system32\msmuk32.exe | BackDoor-DSA |
| %WINDIR%\svchost.exe | BackDoor-DSA |
| %WINDIR%\system32\explorer.exe | BackDoor-DSA |
System Changes
These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files
The following files have been added to the system:
The following registry elements have been created:
- ax = [binary data]
- sm = [binary data]
- u0 = [binary data]
- u1 = [binary data]
- u2 = [binary data]
- v = 3487281
- stubpath = msmuk32.exe
The following registry elements have been changed:
- (default) = c:\windows\system32\concp32.exe "%1" %*
- vcl = vcl32.exe
- vcl = vcl32.exe
Symptoms
This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.
Method of Infection
Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.
Removal
All Users:
Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:
2.Update to current engine and DAT files for detection and removal.
3.Run a complete system scan.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
1. Please go to the Microsoft Recovery Console and restore a clean MBR.
On windows XP:
Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
On Windows Vista and 7:
Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
Variants