Analysis by: Christopher Daniel So
ALIASES:

TrojanSpy:MSIL/Tzeebot (Microsoft), Trojan-Cleaver (McAfee), Trojan.Tzeebot (Symantec), MSIL/Spy.TzeeBot.C (ESET), MSIL:Tzeebot-A [Trj] (Avast)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This backdoor may be dropped by other malware.

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

It exports functions used by other malware. It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: Varies
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 10 Dec 2015

Arrival Details

This backdoor may be dropped by other malware.

Backdoor Routine

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

  • Copy a file
  • Delete a file
  • Terminate self
  • Upload a file
  • Compute the MD5 hash of a file
  • Capture screenshot
  • Update configuration file
  • Restart self
  • Execute a program

Other Details

This backdoor exports functions used by other malware.

It requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.334.02
FIRST VSAPI PATTERN DATE: 10 Dec 2015
VSAPI OPR PATTERN File: 11.335.00
VSAPI OPR PATTERN Date: 11 Dec 2015

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