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BACKDOOR.WIN32.QUSARRAT.B

January 15, 2019
 Analysis by: Arvin Roi Macaraeg
 ALIASES:

N/A

 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:

Dropped by other malware, 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 executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

321,552 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

21 Dec 2018

Payload:

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

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 files:

  • %System Root%\temp\CEgibifi.tmp

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

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • MUTEX_6MGBmCAheeMzx6khOwZVu789

Backdoor Routine

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

  • Update itself via Local file or URL
  • Reconnect or Disconnect itself
  • Remote Desktop
  • Access on Network Devices connected
  • Uninstall itself
  • Remote Shell
  • Search, Create, Modify, Rename and Delete Registry
  • Download and upload a File
  • Keylogger (Mouse and Keyboard)
  • Modify and Delete (Path and Files)
  • View TCP Connections
  • Attempt to Elevate Client Permissions
  • Shutdown/Restart/Sleep
  • View Passwords
  • Remote Execute a Local File or URL
  • View System Information:
    • Operating System
    • Architecture: x86 (32-bit), or x64 (64-bit)
    • Processor (CPU) Name
    • Memory (RAM)
    • Video Card (GPU) Name
    • Username
    • Computer Name
    • Domain Name
    • Host Name
    • System Drive and Directory
    • Device Up time
    • MAC Address
    • LAN IP Address
    • WAN IP Address
    • Antivirus Installed
    • Firewall Installed
    • Time zone
    • Country
    • ISP
  • Reverse Proxy Feature
  • Kill Process
  • Start Process
  • Install Plugin

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.{BLOCKED}.179:443

Other Details

This Backdoor does the following:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.728.02

FIRST VSAPI PATTERN DATE:

03 Jan 2019

VSAPI OPR PATTERN File:

14.729.00

VSAPI OPR PATTERN Date:

04 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

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %System Root%\temp\CEgibifi.tmp

Step 5

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