TROJ_BUBLIK.YBJ


 ALIASES:

Trojan:Win32/Lethic.I (Microsoft); Trojan.Tracur (Symantec); Trojan.Win32.Bublik.dtyl (Kaspersky); Troj/Wonton-SO (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse SHeur4.CKKA (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:

274,432 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Jul 2015

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 Profile%\WindowsUpdate\MSupdate.exe

(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.)

It creates the following folders:

  • %User Profile%\Application Data\WindowsUpdate
  • C\UPDATE

(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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "%User Profile%\WindowsUpdate\MSupdate.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Update Manager = "%User Profile%\WindowsUpdate\MSupdate.exe"

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\WindowsUpdate\MSupdate.exe

(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.)

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "explorer.exe,%User Profile%\WindowsUpdate\MSupdate.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}6.86.27
  • {BLOCKED}.140.103
  • {BLOCKED}.172.74
  • {BLOCKED}.140.159
  • {BLOCKED}6.82.142
  • {BLOCKED}.142.191
  • {BLOCKED}6.88.225
  • {BLOCKED}.14.106
  • {BLOCKED}6.82.19
  • {BLOCKED}.93.234
  • {BLOCKED}.139.4
  • {BLOCKED}6.89.78
  • {BLOCKED}.7.2
  • {BLOCKED}6.83.100
  • {BLOCKED}.4.152
  • {BLOCKED}.8.15
  • {BLOCKED}.3.105
  • {BLOCKED}.3.204
  • {BLOCKED}.2.221
  • {BLOCKED}6.86.110
  • {BLOCKED}.140.141
  • {BLOCKED}6.88.101
  • {BLOCKED}.140.158
  • {BLOCKED}.140.155
  • {BLOCKED}.4.220
  • {BLOCKED}.172.34
  • {BLOCKED}.129.71
  • {BLOCKED}128.213
  • {BLOCKED}3.1.207

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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 delete files detected as TROJ_BUBLIK.YBJ using either the Startup Disk or Recovery Console

[ Learn More ]

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Taskman = "%User Profile%\WindowsUpdate\MSupdate.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Windows Update Manager = "%User Profile%\WindowsUpdate\MSupdate.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Shell = "explorer.exe,%User Profile%\WindowsUpdate\MSupdate.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.
  • %User Profile%\Application Data\WindowsUpdate
  • C\UPDATE

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_BUBLIK.YBJ. 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\MSupdate.exe


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