TSPY_URSNIF.UK

June 03, 2015
 ALIASES:

TrojanSpy:Win32/Ursnif (Microsoft); Backdoor.Win32.Androm.gxss (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Crypt4.AIQX (AVG)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

410,624 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

03 Jun 2015

Arrival Details

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

  • %System%\bootbdne.exe

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
cmpbbdur = "%System%\bootbdne.exe"

Other System Modifications

This spyware deletes the following files:

  • %System%\bootbdne.exe:Zone.Identifier

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

It adds the following registry keys:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B

It adds the following registry entries:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B
Install = "{random values}"

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B
Client = "{random values}"

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B
{CB859D1A-AEA0-3570-102F-C23944D3167D} = "{random values}"

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}opildbuilder.com/tjcojfopcq.php?{random characters}
  • {BLOCKED}0.1

It deletes itself after execution.

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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\AppDataLow\Software\Microsoft
    • 7926A403-841D-130B-56BD-F8F7EA41AC1B

Step 4

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
    • cmpbbdur = "%System%\bootbdne.exe"
  • In HKEY_CURRENT_USER\Software\AppDataLow\Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B
    • Install = "{random values}"
  • In HKEY_CURRENT_USER\Software\AppDataLow\Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B
    • Client = "{random values}"
  • In HKEY_CURRENT_USER\Software\AppDataLow\Software\Microsoft\7926A403-841D-130B-56BD-F8F7EA41AC1B
    • {CB859D1A-AEA0-3570-102F-C23944D3167D} = "{random values}"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_URSNIF.UK. 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.

  • %System%\bootbdne.exe:Zone.Identifier


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