Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

  TECHNICAL DETAILS

File Size: 74,240 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 05 Sep 2012
Payload: Compromises system security

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_DATCAEN.A

Installation

This backdoor is injected into the following processes running in memory:

  • SVCHOST.EXE

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:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
Type = 20

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
ImagePath = %SystemRoot%\System32\svchost.exe -k netsvcs

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
DisplayName = "Portable Media Connect Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp
Description = "Retrace the removable broadcast connected to your computer. If this service is stopped, online broadcast might not be available."

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSp\Parameters
ServiceDll = %System%\datac1en.dll

Backdoor Routine

This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}l.{BLOCKED}fy.com/8jwpc/odw3ux

NOTES:
It also tries to download a possibly malicious file from the following web site:

  • http://{BLOCKED}l.{BLOCKED}fy.com/oi2c/wlc3/{Host Name}:{MAC Address}/ij83d

However, the said site is inaccessible.

  SOLUTION

Minimum Scan Engine: 9.200

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_DATCAEN.A

    TROJ_DATCAEN.A

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
    • WmdmPmSp

Step 5

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