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BKDR_CHCHES.DQJ

March 14, 2017
 Analysis by: Janus Agcaoili
 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:

Spammed via email, 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 does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size:

82,432 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

02 Mar 2017

Payload:

Connects to URLs/IPs, Collects system 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.

Installation

This backdoor adds the following processes:

  • svchost.exe

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

  • 7585489b515e3f7e

It injects codes into the following process(es):

  • created svchost.exe

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

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

  • Execute Arbitrary Code(s) received from the C&C

It connects to the following websites to send and receive information:

  • lennon.{BLOCKED}r.com:443
  • zebra.{BLOCKED}oud.com:443

Other Details

This backdoor requires the existence of the following files to properly run:

  • {Malware path}\qrtfix.bin <- initial encrypted shell code

It does the following:

  • Queries certain machine specific registry entries and account SID in order to locate, load, decrypt and execute its encrypted shellcodes/payloads

It gathers the following information and reports it to its servers:

  • Hostname
  • Account SID
  • System's Temp path
  • Kernel32.dll File Version

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.262.03

FIRST VSAPI PATTERN DATE:

07 Mar 2017

VSAPI OPR PATTERN File:

13.263.00

VSAPI OPR PATTERN Date:

08 Mar 2017

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 normal mode and scan your computer with your Trend Micro product for files detected as BKDR_CHCHES.DQJ. 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.

Step 4

Search and delete these files

[ 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.  {malware path}\qrtfix.bin

Step 5

Restart in Safe Mode

[ Learn More ]

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_CHCHES.DQJ. 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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