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TROJ_OFICLA.AG

October 08, 2012
 Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan bears the file icons of certain applications to avoid easy detection and consequent removal.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

38,400 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

11 Sep 2010

Installation

This Trojan bears the file icons of the following applications:

  • Microsoft Excel

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\idid

It modifies the following registry key(s)/entry(ies) as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe rundll32.exe yise.ero mpgyjp"

(Note: The default value data of the said registry entry is "Explorer.exe".)

Dropping Routine

This Trojan drops the following files:

  • %System%\yise.ero - detected as TROJ_DLOADR.SMVE

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other Details

This Trojan deletes itself after execution.

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