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TROJ_DUQU.AA

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

Trojan:WinNT/Duqu.B (Microsoft), Trojan.Win32.Duqu.a (Kaspersky), W32.Duqu (Symantec), PWS-Duqu!rootkit (McAfee), Mal/Duqu-A (Sophos), Backdoor:W32/Duqu.C (Fsecure), Trojan.Win32.Duqu.a (Sunbelt), W32/Duqu.A!tr (Fortinet), W32/Duqu.C (Fprot), Trojan.Win32.Duqu (Ikarus),

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan arrives as a component bundled with malware/grayware packages.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

24,960 bytes

File Type:

SYS

Memory Resident:

Yes

Initial Samples Received Date:

20 Oct 2011

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

Autostart Technique

This Trojan 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\{malware name}
Type = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}
ImagePath = "\??\{malware path}\{malware name}.sys"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}
DisplayName = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}\Security
Security = "{hex value}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}\Enum
0 = "Root\LEGACY_1\0000"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}\Enum
Count = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}\Enum
NextInstance = "1"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}\Security

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{malware name}\Enum

Other Details

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

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.508.11

FIRST VSAPI PATTERN DATE:

20 Oct 2011

VSAPI OPR PATTERN File:

8.509.00

VSAPI OPR PATTERN Date:

20 Oct 2011

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 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
    • {malware name}

Step 3

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