PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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: 567,065 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 04 May 2020

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 adds the following processes:

  • "%User Temp%\nsi6B80.tmp\ns6BEE.tmp" cmd /c cd %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700 & copy /b df + dff927fa + dff + dff92 + dff927f + dff9 + 91dfc04 + 91dfc04a + 91 + 91df 7z.exe
  • "%User Temp%\nsi6B80.tmp\ns718A.tmp" cmd /c cd %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700 & copy /b 388f + 2c + 33 + c0952 + 2e8defc + 2e8def 7z.dll
  • "%User Temp%\nsi6B80.tmp\ns7497.tmp" cmd /c cd %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700 & 7z.exe x -pbd250c2d9f9e23da6c69c042f0c48995 e6aea
  • "%User Temp%\nsi6B80.tmp\ns8126.tmp" cmd /c cd %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700 & wscript /b /nologo /E:javascript 40733d2572baf34e923a2dc1750d2d0e.js
  • 7z.exe x -pbd250c2d9f9e23da6c69c042f0c48995 e6aea
  • wscript /b /nologo /E:javascript 40733d2572baf34e923a2dc1750d2d0e.js
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\undefined /c "cd %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\ &undefined /b /nologo /E:javascript undefined start 243dd426e6bf48d30545354d5d35e512"

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Trojan deletes the following folders:

  • %User Temp%\nsi6B80.tmp

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Dropping Routine

This Trojan drops the following files:

  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\undefined
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\388f
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\c0952
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\2c
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\2e8defc
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff927f
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\2e8def
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91dfc04a
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\40733d2572baf34e923a2dc1750d2d0e.js
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\e6aea
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff9
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\windrv.exe
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\33
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff927fa
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\7z.dll
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91dfc04
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91df
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\df
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff92
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\7z.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Trojan.Win32.NEMUCOD.AJ

[ 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

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\undefined
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\388f
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\c0952
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\2c
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\2e8defc
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff927f
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\2e8def
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91dfc04a
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\40733d2572baf34e923a2dc1750d2d0e.js
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\e6aea
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff9
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\windrv.exe
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\33
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff927fa
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\7z.dll
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91dfc04
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\91df
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\df
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\dff92
  • %Application Data%\AppCache_bd250c2d9f9e23da6c69c042f0c48700\7z.exe

Step 4

Search and delete this folder

[ 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%\AppCache_bd250c2d9f9e23da6c69c042f0c48700

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.NEMUCOD.AJ. 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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