Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 141,035 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 13 Apr 2012
Payload: Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_PIDIEF.KFR

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\~temp.exe - BKDR_INJECT.KFR

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.200

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 the malware/grayware file that dropped/downloaded JS_DROPPR.KFR

Step 3

Remove malware files dropped/downloaded by JS_DROPPR.KFR

    • BKDR_INJECT.KFR

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_DROPPR.KFR. 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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