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BKDR_MECIV.AD

October 09, 2012
 Modified by: Sabrina Lei Sioting
 ALIASES:

Backdoor:Win32/Meciv.A (Microsoft); Generic BackDoor!1iv (McAfee); ARC:EmbeddedEXE, [data0000]:Backdoor.Win32.Meciv.af (Kaspersky); ERROR (Sunbelt); Gen:Heur.Bodegun.3 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

It modifies files, disabling programs and applications from properly running.

  TECHNICAL DETAILS

File Size:

114,948 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Mar 2012

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.

Other System Modifications

This backdoor modifies the following files:

  • %Windows%\Prefetch\NTOSBOOT-B00DFAAD.pf
  • %Windows%\Prefetch\WUAUCLT.EXE-399A8E72.pf

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It deletes the following files:

  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WmdmPmSN\Parameters
ServiceStartAddr = "{malware path and file name}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WmdmPmSN\Parameters
ServiceDll = "%SystemRoot%\System32\datac1en.dll"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This backdoor drops the following files:

  • %System Root%\datac1en.dll

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://newdelhi.{BLOCKED}alid.com/trandocs/netstat
  • http://newdelhi.{BLOCKED}eport.com/trandocs/netstat
  • http://tibet.{BLOCKED}-sevice.com/trandocs/netstat

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.836.03

FIRST VSAPI PATTERN DATE:

15 Mar 2012

VSAPI OPR PATTERN File:

8.837.00

VSAPI OPR PATTERN Date:

15 Mar 2012

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

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\SYSTEM\ControlSet001\Services\WmdmPmSN\Parameters
    • ServiceStartAddr = "{malware path and file name}"

Step 3

Restore this modified 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\SYSTEM\ControlSet001\Services\WmdmPmSN\Parameters
    • From: ServiceDll = "%SystemRoot%\System32\datac1en.dll"
      To: ServiceDll = ""{random values}""

Step 4

Search and delete this file

[ Learn More ]
There may be some component files 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.
  • %System Root%\datac1en.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_MECIV.AD. 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 deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Windows%\Prefetch\NTOSBOOT-B00DFAAD.pf
    • %Windows%\Prefetch\WUAUCLT.EXE-399A8E72.pf

Step 7

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.

  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log


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