TSPY_URELAS.AC

 Analysis by: Rhena Inocencio

 ALIASES:

Trojan:Win32/Comisproc (Microsoft), Trojan.Win32.Wecod.pfa (Kaspersky)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

1,160,192 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 May 2013

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This spyware drops the following component file(s):

  • {malware path}\$$WindowsXp.bat
    • It used to delete the initial malware copy. This file is deleted after execution

It drops the following copies of itself into the affected system:

  • %Program Files%\Primary Interop Assemblies\Window system32\MSO\ SH123\ad0002.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This spyware 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\ControlSet001\
Services\ServiceHost SH123
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123
ImagePath = "%Program Files%\Primary Interop Assemblies\Window system32\MSO\ SH123\ad0002.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123
DisplayName = "Remote Access Connection Locate Host SH123_20111108"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Enum\Root\LEGACY_SERVICEHOST_SH123
NextInstance = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123\
0000\Control
ActiveService = "ServiceHost SH123"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123\
0000
DeviceDesc = "Remote Access Connection Locate Host SH123_20111108"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123\Enum
0 = "Root\LEGACY_SERVICEHOST_SH123\0000"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123\
0000
Class = "LegacyDriver"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123\
0000
ConfigFlags = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123\
0000
Legacy = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123\
0000
Service = "ServiceHost SH123"

It starts the following services:

  • ServiceName: ServiceHost SH123
    DisplayName: Remote Access Connection Locate Host SH123_20111108
    ImagePath: %Program Files%\Primary Interop Assemblies\Window system32\MSO\ SH123\ad0002.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other System Modifications

This spyware adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ServiceHost SH123

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SERVICEHOST_SH123

Information Theft

This spyware gathers the following data:

  • Game screenshots
  • Operating system version
  • Computer name

Other Details

This spyware deletes the initially executed copy of itself

NOTES:

This spyware captures screenshots by monitoring the following game-related processes:

  • Baduki.exe
  • DuelPoker.exe
  • HOOLA3.EXE
  • LASPOKER.exe
  • PMClient.EXE
  • highlow2.exe
  • poker7.exe

It sends the information it gathers to the following remote site:

  • {BLOCKED}.166.177

  SOLUTION

Minimum Scan Engine:

9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • ServiceHost SH123
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root
    • LEGACY_SERVICEHOST_SH123

Step 4

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