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BKDR_URSNIF.FJ

April 08, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

TrojanSpy:Win32/Ursnif(Microsoft), Trojan-Spy.Win32.Ursnif(Ikarus)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This backdoor may be dropped by other malware. It arrives as a component bundled with malware/grayware packages.

It connects to certain websites to send and receive information. It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

65,024 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

03 Apr 2013

Payload:

Compromises system security, Connects to URLs/IPs, Steals information

Arrival Details

This backdoor may be dropped by other malware.

It arrives as a component bundled with malware/grayware packages.

Other System Modifications

This backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\Internet Explorer\
Security\AntiPhishing\{GUID}
ID = {random value}

HKEY_CRRENT_USER\Software\AppDataLow\
Software\Microsoft\Internet Explorer\
Security\AntiPhishing\{GUID}
Group = {random value}

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Archive and upload file(s)
  • Capture screenshot
  • Clear cookies
  • Download a configuration file
  • Download file(s)
  • Open a SOCKS proxy
  • Reboot the affected system
  • Steal certificates
  • Steal cookies
  • Update configuration file
  • Upload a log file which contains stolen information

It connects to the following website to send and receive information:

  • {BLOCKED}serv.com
  • {BLOCKED}tic.com

It requires its main component to successfully perform its intended routine.

NOTES:

This spyware attempts to download a configuration file which may contain a list of targeted websites from which it will steal information.

It injects code into running processes to accomplish the aforementioned routine:

  • chrome.exe
  • explorer.exe
  • firefox.exe
  • iexplore.exe
  • opera.exe
  • safari.exe

Injected codes are patched in the following APIs to steal any information passed to hooked APIs:

  • HttpOpenRequestA
  • HttpOpenRequestW
  • HttpSendRequestA
  • HttpSendRequestW
  • InternetConnectW
  • InternetQueryDataAvailableInternetConnectA
  • InternetReadFileExA
  • InternetReadFile
  • InternetReadFileExW

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.840.05

FIRST VSAPI PATTERN DATE:

06 Apr 2013

VSAPI OPR PATTERN File:

9.841.00

VSAPI OPR PATTERN Date:

07 Apr 2013

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

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\AppDataLow\Software\Microsoft\Internet Explorer\Security\AntiPhishing\{GUID}
    • ID = {random value}
  • In HKEY_CURRENT_USER\Software\AppDataLow\Software\Microsoft\Internet Explorer\Security\AntiPhishing\{GUID}
    • Group = {random value}

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_URSNIF.FJ . 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.


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