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TROJ_DROPPER.ZTAJ-B (DNP)

November 05, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Exp/20120158-A, Exp/20120158-A (Sophos), Exploit-CVE2012-0158 (McAfee)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

329,248 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

31 Oct 2013

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops the following files:

  • %System%\MSI7188L.dll

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Autostart Technique

This Trojan registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Audioclr\Parameters
ServiceDll = "MFI7188L.dll"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Audioclr

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Audioclr\Parameters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Audioclr\Security

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Audioclr\Enum