ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft); RDN/Generic.grp (McAfee); Trojan.Gen.2 (Symantec); Backdoor.Win32.Androm.naob (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse MSIL11.ATXG (AVG)

 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: 571,936 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 08 May 2017

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 copies of itself into the affected system:

  • %User Temp%\WindowsUpdate\Window Update.exe

(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 creates the following folders:

  • %User Profile%\AppData
  • %User Profile%\AppData\Local
  • %User Profile%\Local\Temp
  • %User Profile%\Temp\WindowsUpdate

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

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\WindowsUpdate\Window Update.exe:Zone.Id entifier
  • %User Profile%\WindowsUpdate\svhost.bat
  • %User Startup%\Window Update.exe:Zone.Id entifier

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

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Temp%\WindowsUpdate\Window Update.exe.lnk "

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\WindowsUpdate\Window Update.exe.lnk
  • %User Startup%\Window Update.exe.lnk
  • %User Profile%\WindowsUpdate\Window Update.exe.bat
  • %User Profile%\Temp\.Identifier

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.125.109

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.8

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

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
    • Load = "%User Temp%\WindowsUpdate\Window Update.exe.lnk "

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.
  • %User Profile%\WindowsUpdate\Window Update.exe.lnk
  • %User Startup%\Window Update.exe.lnk
  • %User Profile%\WindowsUpdate\Window Update.exe.bat
  • %User Profile%\Temp\.Identifier

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.
  • %User Profile%\AppData
  • %User Profile%\AppData\Local
  • %User Profile%\Local\Temp
  • %User Profile%\Temp\WindowsUpdate

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DYNAMER.XYBK. 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.

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\WindowsUpdate\Window Update.exe:Zone.Id entifier
  • %User Profile%\WindowsUpdate\svhost.bat
  • %User Startup%\Window Update.exe:Zone.Id entifier


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