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Threat Encyclopedia

WORM_DROM.AI


ALIASES:

PWS:Win32/Ceekat.gen!A (Microsoft); W32/Autorun.worm.gen.ah (McAfee); W32.Drom (Symantec); Worm.Win32.AutoRun.xy (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse PSW.OnlineGames.BED (AVG)

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:

23,087 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 May 2013

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.

Installation

This worm drops the following copies of itself into the affected system:

  • %Program Files%\Internet Explorer\msvcrt.bak

(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).)

It creates the following folders:

  • Notfound\ws2_32.dll\!O!0..
  • Notfound\ws2_32.dll
  • Notfound\AntiVirus\ws2_32.dll
  • Notfound\AntiVirus\ws2_32.dll\!O!0..

Autostart Technique

This worm registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{D3626E66-B13B-C628-ACDF-BDABCFA265E1}

Other System Modifications

This worm deletes the following files:

  • E F C?D F E A 6 ñ_CHAR(0x1B)_ì
  • %Program Files%\Internet Explorer\msvcrt.bak
  • ?Úok
  • %System%\drivers\etc\hosts

(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).. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It deletes the following folders:

  • %Program Files%\Internet Explorer\msvcrt.dll
  • %Program Files%\Internet Explorer\msvcrt.bak
  • %Program Files%\Internet Explorer\msvcrt.ebk
  • %User Temp%\smss.exe
  • %User Temp%\csrss.exe
  • %User Temp%\svchost32.exe
  • %User Temp%\svchost.exe
  • %User Temp%\conime.exe
  • %User Temp%\ctfmon.exe
  • %User Temp%\mmc.exe
  • %User Temp%\services.exe
  • %User Temp%\IEXPLORE.EXE
  • %User Temp%\stpgldk.exe
  • %User Temp%\srogm.exe
  • %User Temp%\spglsdr.exe
  • %User Temp%\copypfh.exe
  • %User Temp%\okfile.exe
  • %User Temp%\fyso.exe
  • %User Temp%\jtso.exe
  • %User Temp%\mhso.exe
  • %User Temp%\c~c(iulw
  • %User Temp%\wdso.exe
  • %User Temp%\wgso.exe
  • %User Temp%\wlso.exe
  • %User Temp%\wmso.exe
  • %User Temp%\woso.exe
  • %User Temp%\ztso.exe
  • %User Temp%\daso.exe
  • %User Temp%\tlso.exe
  • %User Temp%\rxso.exe
  • %User Temp%\fyso0.dll
  • %User Temp%\jtso0.dll
  • %User Temp%\mhso0.dll
  • %User Temp%\qjso0.dll
  • %User Temp%\wdso0.dll
  • %User Temp%\wgso0.dll
  • %User Temp%\wlso0.dll
  • %User Temp%\wmso0.dll
  • %User Temp%\woso0.dll
  • %User Temp%\ztso0.dll
  • %User Temp%\tlso0.dll
  • %User Temp%\daso0.dll
  • %User Temp%\rxso0.dll

(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).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{0FAD2E16-C8EF-5AC1-1E6A-AE3FD8EF56B3}

HKEY_CLASSES_ROOT\CLSID\{0FAD2E16-C8EF-5AC1-1E6A-AE3FD8EF56B3}\
InProcServer32

HKEY_CLASSES_ROOT\CLSID\{D3626E66-B13B-C628-ACDF-BDABCFA265E1}

HKEY_CLASSES_ROOT\CLSID\{D3626E66-B13B-C628-ACDF-BDABCFA265E1}\
InProcServer32

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0FAD2E16-C8EF-5AC1-1E6A-AE3FD8EF56B3}\InProcServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D3626E66-B13B-C628-ACDF-BDABCFA265E1}\InProcServer32
ThreadingModel = "Apartment"

Dropping Routine

This worm drops the following files:

  • %Program Files%\Internet Explorer\msvcrt.dll
  • %Program Files%\Common Files\Relive.dll

(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).)

This report is generated via an automated analysis system.

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

Close all opened browser windows

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_CLASSES_ROOT\CLSID
    • {0FAD2E16-C8EF-5AC1-1E6A-AE3FD8EF56B3}
  • In HKEY_CLASSES_ROOT\CLSID\{0FAD2E16-C8EF-5AC1-1E6A-AE3FD8EF56B3}
    • InProcServer32
  • In HKEY_CLASSES_ROOT\CLSID
    • {D3626E66-B13B-C628-ACDF-BDABCFA265E1}
  • In HKEY_CLASSES_ROOT\CLSID\{D3626E66-B13B-C628-ACDF-BDABCFA265E1}
    • InProcServer32

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\Classes\CLSID\{0FAD2E16-C8EF-5AC1-1E6A-AE3FD8EF56B3}\InProcServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D3626E66-B13B-C628-ACDF-BDABCFA265E1}\InProcServer32
    • ThreadingModel = "Apartment"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Program Files%\Internet Explorer\msvcrt.dll
  • %Program Files%\Common Files\Relive.dll

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • Notfound\ws2_32.dll\!O!0..
  • Notfound\ws2_32.dll
  • Notfound\AntiVirus\ws2_32.dll
  • Notfound\AntiVirus\ws2_32.dll\!O!0..

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_DROM.AI. 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 8

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.

  • E F C?D F E A 6 ñ_CHAR(0x1B)_ì
  • %Program Files%\Internet Explorer\msvcrt.bak
  • ?Úok
  • %System%\drivers\etc\hosts


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