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BKDR_CHCHES.NAQ

April 14, 2017
 Analysis by: Warren Adam Sto. Tomas
 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


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.

It modifies the Internet Explorer Zone Settings.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size:

6,144 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

11 Apr 2017

Payload:

Connects to URLs/IPs, Steals 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 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
IPHelper.exe = “%ProgramData%\IPHelper\IPHelper.exe "1236"”

It adds and runs the following services:

  • IP Client
    • Path = "C:\ProgramData\IPHelper\IPHelper.exe ""1238"""
    • DisplayName = "IPcache"

Backdoor Routine

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

  • Execute Arbitrary Code(s) received from the C&C
  • List files within a directory
  • Copy, delete, rename, or move files
  • List available drives and its drive type

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

  • {BLOCKED}.{BLOCKED}.13.155:443

Web Browser Home Page and Search Page Modification

This Backdoor modifies the Internet Explorer Zone Settings.

Other Details

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

  • {malware path}\msvcr110.dat

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

  • System information
  • Host name
  • Network adapter
  • User name
  • Computer name

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.334.06

FIRST VSAPI PATTERN DATE:

11 Apr 2017

VSAPI OPR PATTERN File:

13.335.00

VSAPI OPR PATTERN Date:

12 Apr 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 Safe Mode

[ Learn More ]

Step 4

Disable this malware service

[ Learn More ]
  •  
    • IP Client

Step 5

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.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • IPHelper.exe = “%ProgramData%\IPHelper\IPHelper.exe "1236"”

Step 6

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}\msvcr110.dat

Step 7

Reset Internet security settings

[ Learn More ]

Step 8

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