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BKDR_REDOSDRU.AA

October 08, 2012
 Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This backdoor requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

625,353 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

14 Oct 2010

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\AeLookup
Description = "Microsoft .NET and Windows XP COM+ Integration with SOAP"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AeLookup
DisplayName = "Application Experience Lookup Service"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AeLookup
ImagePath = "%System%\\svchost.exe -k "AeLookup""

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

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AeLookup
Type = 272

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AeLookup
ServiceDll = "{malware path and file name}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
AeLookup = "AeLookup"

Other Details

This backdoor requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.540.08

VSAPI PATTERN Date:

15 Oct 2010

VSAPI PATTERN Date:

10/15/2010 12:00:00 AM

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

Restart in Safe Mode

[ Learn More ]

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.

  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • AeLookup

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
    • AeLookup=AeLookup

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_REDOSDRU.AA. 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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