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BKDR_GRAYBIRD.AAA

November 12, 2016
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

Trojan.Win32.Mepaow.apnn (Kaspersky), Trojan:Win32/Provis!rts (Microsoft), a variant of Win32/Spy.VB.NIL (ESET-NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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 listens on port(s). It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

405,504 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Nov 2016

Payload:

Steals information, Logs keystrokes, Executes files

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.

Installation

This backdoor drops the following file(s)/component(s):

  • {Malware Path}\atraxce.dat
  • {Malware Path}\comnctt.xdc
  • {Malware Path}\expand.dat
  • {Malware Path}\expiorer.ocx
  • {Malware Path}\gcdb.dsn
  • {Malware Path}\gcdb_file.dsn
  • {Malware Path}\msvbvm5.dat

Backdoor Routine

This backdoor listens on the following port(s):

  • 8150

It executes the following commands from a remote malicious user:

  • Log Keystrokes
  • Get System Information
  • Get Operating System
  • List Software/Hardware
  • Download Files
  • Execute Files
  • Capture Screen
  • Capture Device
  • List/Kill Processes
  • List Windows
  • Lock/Unlock Desktop
  • Create/Copy/Rename/Delete Files
  • Create/Copy/Rename/Delete Folders
  • Shutdown
  • Restart
  • Remove Partitions
  • Uninstall
  • Monitor Chat Applications

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.892.06

FIRST VSAPI PATTERN DATE:

11 Nov 2016

VSAPI OPR PATTERN File:

12.893.00

VSAPI OPR PATTERN Date:

12 Nov 2016

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

Identify and terminate files detected as BKDR_GRAYBIRD.AAA

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_GRAYBIRD.AAA. 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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