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BKDR_INJECT.EVL

October 09, 2012
 Analysis by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This backdoor may be dropped by other malware.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

07 May 2012

Payload:

Drops files, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_SCRIPBRID.A

Installation

This backdoor drops the following component file(s):

  • %System%\svc32ex.dll - also detected as BKDR_INJECT.EVL

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Its DLL component is injected to the following process(es):

  • svchost.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • allthesam

Autostart Technique

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\6to4\Parameters
ServiceDll = "%System%\svc32ex.dll"

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • http://www.{BLOCKED}ups.com/update/count.asp

NOTES:

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\6to4

It is capable of executing the following commands:

  • Download and execute file(s)
  • Download an updated copy of itself
  • Query/Open/Start/Stop/Delete Service(s)
  • Uninstall itself

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.978.07

FIRST VSAPI PATTERN DATE:

07 May 2012

VSAPI OPR PATTERN File:

8.979.00

VSAPI OPR PATTERN Date:

08 May 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

Remove malware files dropped/downloaded by BKDR_INJECT.EVL

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • 6to4

Step 5

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