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TROJ_DROPR.IV

October 08, 2012
 Analysis by: jont
 PLATFORM:

Windows 2000, XP, 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 may be downloaded by other malware/grayware from remote sites.

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

234,141 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Nov 2010

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • WORM_VBNA.CD

Installation

This Trojan drops the following files:

  • %User Profile%\cbsop.exe - detected as TROJ_FAKEAV.SMRZ
  • %User Profile%\xhqour.exe - detected as WORM_VBNA.SMKV

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Dropping Routine

This Trojan executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

Other Details

This Trojan deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.656.03

VSAPI PATTERN Date:

28 Nov 2010

VSAPI PATTERN Date:

11/28/2010 12:00:00 AM

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_DROPR.IV

    TROJ_FAKEAV.SMRZ
    WORM_VBNA.SMKV

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPR.IV. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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