Analysis by: Mark Joseph Manahan
ALIASES:

Troj/Farfli-BO (Sophos) ,Trojan horse Downloader.Generic13.BYVK (AVG) ,W32/Agent.AKL!tr (Fortinet) ,Trojan-Downloader.Win32.Injecter (Ikarus) ,Trojan-Downloader.Win32.Injecter.jiw (Kaspersky) ,RDN/Generic Downloader.x!ji (McAfee) ,Win32/TrojanDownloader.Agent.AKL trojan (Eset) ,Downloader (Symantec) ,Generic (Panda) ,Trojan.Win32.Generic!BT (Sunbelt)

 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: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 11,776 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 26 Mar 2014

Arrival Details

This Trojan may be dropped by the following malware:

  • BKDR_SIMBOTDRP.ZTBD-R

Installation

This Trojan drops the following non-malicious file:

  • %User Temp%\notepad.exe if HKEY_CURRENT_USER\Software\Trendmicro is present

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following processes:

  • notepad.exe

Other Details

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

  • %User Temp%\tmp.dat - TROJ_SIMBOTENC.ZTBD-R (decrypted and injected to notepad.exe)

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.688.05
FIRST VSAPI PATTERN DATE: 26 Mar 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file that dropped/downloaded TROJ_SIMBOTLDR.ZTBC-R. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_SIMBOTLDR.ZTBC-R 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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