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BKDR_RUNAGRY.F

December 06, 2012
 Analysis by: Mark Joseph Manahan
 ALIASES:

TrojanDownloader:Win32/Troxen!rts (Microsoft), a variant of Win32/TrojanDownloader.Adload.NHT trojan (Eset), Backdoor.Trojan (Symantec)

 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:

  • In the wild: Yes

  OVERVIEW

This backdoor 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:

244,736 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

01 Jul 2010

Arrival Details

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Default} = "{Malware Path and Filename}"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{Default} = "{Malware Path and Filename}"

Other System Modifications

This backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software\{random}
lld = "{Date of Infection}"

It adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\{random}

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://stop.{BLOCKED}biddenerror.com/log{number}.php?cpid={value}
  • http://stop.{BLOCKED}biddenerror.com/gnome.php?cpid={value}
  • http://404.{BLOCKED}ebsitedatabase.com/gnome.php?cpid={value}
  • http://kr.yahoo.com
  • http://www.daum.net
  • http://www.microsoft.com
  • http://search.11st.co.kr/searchprdaction.tmall?
  • http://kr.search.yahoo.com/search?
  • http://search.msn.co.kr/results.aspx?
  • http://www.google.co.kr/search?
  • http://kr.altavista.com/web/results?
  • http://search.daum.net/search?
  • http://sp3.yousee.com
  • http://r{BLOCKED}00.com

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

7.278.12

FIRST VSAPI PATTERN DATE:

01 Jul 2010

VSAPI OPR PATTERN File:

7.279.00

VSAPI OPR PATTERN Date:

02 Jul 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and terminate files detected as BKDR_RUNAGRY.F

[ 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

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_CURRENT_USER\Software
    • {random}

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
    • {Default} = "{Malware Path and Filename}"
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • {Default} = "{Malware Path and Filename}"

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_RUNAGRY.F 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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