Analysis by: John Karlo Agon
ALIASES:

Backdoor:MSIL/Tzeebot.B (Microsoft), a variant of MSIL/Spy.TzeeBot.A (ESET-NOD32), TzeeBot.D (Norman), Backdoor.MSIL.Tnzbt.AY (Baidu-International), MSIL:Tzeebot-B [Trj] (Avast)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

It steals certain information from the system and/or the user.

  TECHNICAL DETAILS

File Size: 100,352 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 18 Aug 2015
Payload: Steals information

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Copy Files
  • Delete Files
  • Upload Files
  • Create and terminate processes
  • Delete Folders

Information Theft

This backdoor steals the following information:

  • IP address
  • Keystroke logs

NOTES:

This backdoor does not perform its intended routine since the compiled code has not initialized some variables.

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.862.04
FIRST VSAPI PATTERN DATE: 18 Aug 2015
VSAPI OPR PATTERN File: 11.863.00
VSAPI OPR PATTERN Date: 19 Aug 2015

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

Scan your computer with your Trend Micro product to delete files detected as BKDR_TZEEBOT.JK. 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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