BKDR_LAPTHO.A

 Analysis by: Cris Nowell Pantanilla

 ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft), Trojan.Win32.Scar.ouqn (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This backdoor connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

455,680 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Aug 2016

Payload:

Connects to URLs/IPs, Logs keystrokes

Arrival Details

This backdoor may be downloaded from the following remote sites:

  • http://{blocked}dhornpark.or.th/2014/upload/slide/mass.exe

Installation

This backdoor drops the following copies of itself into the affected system:

  • %Application Data%\Mins\mieces.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 creates the following folders:

  • %Application Data%\Mins

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

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
wsecor = "%Application Data%\Mins\mieces.exe"

Backdoor Routine

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

  • {blocked}.{blocked}.181.178

Other Details

This backdoor does the following:

  • This backdoor is capable of the following:
    • Create/Modify/Delete/Search Files
    • Create/Modify/Delete/Search Folders
    • Search/Access Drives
    • List/Execute/Terminate Processes
    • Get System Info (OS,Mac Address, Versions)
    • Check Installed Antivirus
    • Log Keystrokes
    • Capture Webcam
    • Capture Mic
    • Capture Screenshot
  • It checks if the following antivirus exist in the affected system:
    • AVG
    • AntiMalware
    • Avast
    • Avira
    • BitDefender
    • FProt
    • FSecure
    • Kaspersky
    • McAfee
    • Microsoft-Security-Essentials
    • NOD32
    • QuickHeal
    • Symantec

  SOLUTION

Minimum Scan Engine:

9.800

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

Identify and terminate files detected as BKDR_LAPTHO.A

[ 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 3

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
    • wsecor = "%Application Data%\Mins\mieces.exe"

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. %Application Data%\Mins

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_LAPTHO.A. 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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