WORM_PIKORMS.G

October 13, 2012
 ALIASES:

Worm:Win32/Jadtre.gen!D (Microsoft); Generic Dropper.uk (McAfee); W32.Wapomi (Symantec); PAK:Petite (Kaspersky); Worm.Win32.Pikorms.B (v) (Sunbelt); Worm.Generic.249733 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size:

71,537 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Aug 2012

Arrival Details

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

Autostart Technique

This worm 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\13DA6D64

Other System Modifications

This worm deletes the following files:

  • %Temp%\177612cd.rar
  • %System%\CatRoot2\edbtmp.log
  • %System%\CatRoot2\edb.log
  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log

(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.. %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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\13DA6D64
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\13DA6D64
Type = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\13DA6D64
ImagePath = "system32\drivers\13DA6D64.sys"

Dropping Routine

This worm drops the following files:

  • %System Root%\Documents and Settings\Infotmp.txt
  • %Temp%\r40170dd3.txt

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}0.1:8080/msdownload/update/v5/redir/wuredir.rar

This report is generated via an automated analysis system.

  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

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
    • 13DA6D64

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\SYSTEM\ControlSet001\Services\13DA6D64
    • Start = "3"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\13DA6D64
    • Type = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\13DA6D64
    • ImagePath = "system32\drivers\13DA6D64.sys"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %System Root%\Documents and Settings\Infotmp.txt
  • %Temp%\r40170dd3.txt

Step 6

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

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Temp%\177612cd.rar
  • %System%\CatRoot2\edbtmp.log
  • %System%\CatRoot2\edb.log
  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log


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