TROJ_RADMIN.LEK

August 10, 2018
 Analysis by: Michael Jhon Ofiaza
 ALIASES:

Backdoor.Win32.RMS.sd (Kaspersky) ; PUA.Gen.6 (Norton)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

6,782,758 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 Aug 2018

Payload:

Drops files

Arrival Details

This Trojan 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 Trojan drops the following files:

  • %User Temp%\7ZipSfx.000\rms.host6.2ru.mod.msi ->deleted afterwards

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It drops and executes the following files:

  • %User Temp%\7zipSfx.000\install.cmd -> deleted afterwards

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It adds the following processes:

  • chcp 1251
  • %System%\msiexec.exe MsiExec /x {61FFA475-24D5-44FB-A51F-39B699E3D82C} /passive REBOOT=ReallySuppress
  • %System%\msiexec.exe MsiExec /x {B159125C-6EAA-409F-8F12-C5388879372F} /passive REBOOT=ReallySuppress
  • %System%\PING.EXE ping 127.0.0.1
  • %System%\msiexec.exe MsiExec /I "rms.host6.2ru_mod.msi" /qn -> used to install rms.host6.ru_mod.msi quietly and no UI

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.434.05

FIRST VSAPI PATTERN DATE:

10 Aug 2018

VSAPI OPR PATTERN File:

14.435.00

VSAPI OPR PATTERN Date:

11 Aug 2018

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 TROJ_RADMIN.LEK

[ 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

Scan your computer with your Trend Micro product to delete files detected as TROJ_RADMIN.LEK. 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 the following Trend Micro Support pages for more information:


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