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BKDR64_KVNDM.E

March 01, 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:

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 connects to a website to send and receive information. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

105,992,971 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

24 Feb 2017

Payload:

Connects to URLs/IPs

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 mutexes to ensure that only one of its copies runs at any one time:

  • Global\fmaopkf

Backdoor Routine

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

  • Gather System Information
    • System Language
    • Computer Name
    • OS Information (Architecture, Version)
    • Host Name
    • Processor Information
    • Current Memory Usage
    • Administrative Status
    • Driver Information (Letter, Type, Diskspace)
    • User Name
    • Removable Drives Connected
    • Ip Configuration
    • List Of Program Files
    • System Information (from systeminfo.exe)
    • SETAPI.Dev.Log Files
  • Create Arbitrary Processes
  • Execute arbitrary Power shell commands
    • Uses the command: "powershell –encodedcommand {data/code}"
  • Download/Execute Arbitrary Plugins
  • Uninstall itself
    • Drops and executes the following:
      • %User Temp%\xxm{random}.bat <- used to delete itself, deleted afterwards
  • Change the Interval of activity time
  • Change the C&C URL accessed
  • Download and Execute arbitrary files
  • Perform custom mimikatz metasploit commands
  • Use “espia” commands to gather the following information:
    • Clipboard dump
    • Keyboard dump
    • Video/Image dump
  • Use “stdapi” commands to execute the following:
    • Sleep
    • Shell commands
    • List Arbitrary Files/Drives/Directories
    • Upload/Download arbitrary files
    • Create, Delete, and Navigate through Files/Directories

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

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

  • http://{BLOCKED}i.{BLOCKED}n.com/howto/img/index.php?h={random hex value}&o=0&w={hex value based on system information}&a={communication type = (0/1/2)}&y=20000

However, as of this writing, the said sites are inaccessible.

Other Details

This backdoor does the following:

  • The malware has an activity time from 00:00 to 24:00 based from its configuration

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.250.05

FIRST VSAPI PATTERN DATE:

01 Mar 2017

VSAPI OPR PATTERN File:

13.251.00

VSAPI OPR PATTERN Date:

02 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

Identify and terminate files detected as BKDR64_KVNDM.E

[ 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 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.  %Uset Temp%\xxm{random}.bat

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR64_KVNDM.E. 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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