➔
search
✕

BACKDOOR.WIN32.PACAVI.THABAGAH

January 15, 2019
 Analysis by: John Rey Canon
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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 connects to a website to send and receive information.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size:

688,640 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

17 Dec 2018

Payload:

Modifies system registry, Connects to URLs/IPs, Collects system information, Steals information, Others

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.

This malware arrives via the following means:

Installation

This Backdoor adds the following processes:

  • %System%\svchost.exe -k

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It injects codes into the following process(es):

  • Created svchost.exe

Autostart Technique

This Backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
222 = %Application Data%\TeamViewer\TeamViewer.exe

Other System Modifications

This Backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software\Google\
Update
DataC = {BLOCKED}.{BLOCKED}.144.220:443

HKEY_CURRENT_USER\Software\Google\
Common\Rlz\Events
vp = {Random Numbers}

Backdoor Routine

This Backdoor connects to the following websites to send and receive information:

  • {BLOCKED}.{BLOCKED}.144.220:443

Information Theft

This Backdoor gathers the following information on the affected computer:

  • Computer Username
  • Primary Disk Name and Serial ID

Other Details

This Backdoor does the following:

  • It is capable of the following:
    • Remote access/control

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.752.03

FIRST VSAPI PATTERN DATE:

15 Jan 2019

VSAPI OPR PATTERN File:

14.753.00

VSAPI OPR PATTERN Date:

16 Jan 2019

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • 222 = %Application Data%\TeamViewer\TeamViewer.exe
  • HKEY_CURRENT_USER\Software\Google\Update
  • DataC = 185.206.144.220:443
  • HKEY_CURRENT_USER\Software\Google\Common\Rlz\Events
  • vp = {Random Numbers}

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BACKDOOR.WIN32.PACAVI.THABAGAH. 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.


Did this description help? Tell us how we did.