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TROJ_DROPR.AEG

July 04, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

Trojan.Win32.Monder.gen(Sunbelt), W32/Monder.QNS!tr(Fortinet), Trojan-Dropper.Agent(Ikarus), probably a variant of Win32/TrojanDropper.Agent.NUE trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as a component bundled with malware/grayware packages.

  TECHNICAL DETAILS

File Size:

128,000 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

27 Jun 2013

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

Installation

This Trojan drops the following files:

  • %Windows%\msus.dll
  • %Windows%\update_srv.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Autostart Technique

This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Update Service = "%Windows%\update_srv.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\msdx
DLLName = "%Windows%\msdx.dll"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\msdx

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\msdx
Logon = "Logon"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\msdx
Logoff = "Logoff"

Other Details

This Trojan requires the existence of the following files to properly run:

  • %Windows%\msdx.dll

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)