WORM_SOHANAD.VE


 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:

1,105,752 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Sep 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:

  • D:\Windows\System32\dllwm.exe
  • E:\Windows\System32\dllwm.exe
  • A:\Secret.exe
  • A:\sex_xxx.mp4.exe
  • A:\hot Picture.png.exe
  • A:\photo_453.jpg.exe
  • B:\Secret.exe
  • B:\sex_xxx.mp4.exe
  • B:\hot Picture.png.exe
  • B:\photo_453.jpg.exe
  • %System Root%\Secret.exe
  • %System Root%\sex_xxx.mp4.exe
  • %System Root%\hot Picture.png.exe
  • %System Root%\photo_453.jpg.exe
  • D:\Secret.exe
  • D:\sex_xxx.mp4.exe
  • D:\hot Picture.png.exe
  • D:\photo_453.jpg.exe
  • E:\Secret.exe
  • E:\sex_xxx.mp4.exe
  • E:\hot Picture.png.exe
  • E:\photo_453.jpg.exe
  • F:\Secret.exe
  • F:\sex_xxx.mp4.exe
  • F:\hot Picture.png.exe
  • F:\photo_453.jpg.exe
  • G:\Secret.exe
  • G:\sex_xxx.mp4.exe
  • G:\hot Picture.png.exe
  • G:\photo_453.jpg.exe
  • H:\Secret.exe
  • H:\sex_xxx.mp4.exe
  • H:\hot Picture.png.exe
  • H:\photo_453.jpg.exe
  • I:\Secret.exe
  • I:\sex_xxx.mp4.exe
  • I:\hot Picture.png.exe
  • I:\photo_453.jpg.exe
  • J:\Secret.exe
  • J:\sex_xxx.mp4.exe
  • J:\hot Picture.png.exe
  • J:\photo_453.jpg.exe
  • K:\Secret.exe
  • K:\sex_xxx.mp4.exe
  • K:\hot Picture.png.exe
  • K:\photo_453.jpg.exe
  • L:\Secret.exe
  • L:\sex_xxx.mp4.exe
  • L:\hot Picture.png.exe
  • L:\photo_453.jpg.exe
  • M:\Secret.exe
  • M:\sex_xxx.mp4.exe
  • M:\hot Picture.png.exe
  • M:\photo_453.jpg.exe
  • N:\Secret.exe
  • N:\sex_xxx.mp4.exe
  • N:\hot Picture.png.exe
  • N:\photo_453.jpg.exe
  • O:\Secret.exe
  • O:\sex_xxx.mp4.exe
  • O:\hot Picture.png.exe
  • O:\photo_453.jpg.exe
  • P:\Secret.exe
  • P:\sex_xxx.mp4.exe
  • P:\hot Picture.png.exe
  • P:\photo_453.jpg.exe
  • Q:\Secret.exe
  • Q:\sex_xxx.mp4.exe
  • Q:\hot Picture.png.exe
  • Q:\photo_453.jpg.exe
  • R:\Secret.exe
  • R:\sex_xxx.mp4.exe
  • R:\hot Picture.png.exe
  • R:\photo_453.jpg.exe
  • S:\Secret.exe
  • S:\sex_xxx.mp4.exe
  • S:\hot Picture.png.exe
  • S:\photo_453.jpg.exe
  • T:\Secret.exe
  • T:\sex_xxx.mp4.exe
  • T:\hot Picture.png.exe
  • T:\photo_453.jpg.exe
  • U:\Secret.exe
  • U:\sex_xxx.mp4.exe
  • U:\hot Picture.png.exe
  • U:\photo_453.jpg.exe
  • V:\Secret.exe
  • V:\sex_xxx.mp4.exe
  • V:\hot Picture.png.exe
  • V:\photo_453.jpg.exe
  • W:\Secret.exe
  • W:\sex_xxx.mp4.exe
  • W:\hot Picture.png.exe
  • W:\photo_453.jpg.exe
  • X:\Secret.exe
  • X:\sex_xxx.mp4.exe
  • X:\hot Picture.png.exe
  • X:\photo_453.jpg.exe
  • Y:\Secret.exe
  • Y:\sex_xxx.mp4.exe
  • Y:\hot Picture.png.exe
  • Y:\photo_453.jpg.exe
  • Z:\Secret.exe
  • Z:\sex_xxx.mp4.exe
  • Z:\hot Picture.png.exe
  • Z:\photo_453.jpg.exe

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

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Update = "%System%\dllwm.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Updater = "%User Temp%\server.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Control Panel

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\ Policies\
System

HKEY_CURRENT_USER\Software\Yahoo\
pager\View\YMSGR_buzz

HKEY_CURRENT_USER\Software\Yahoo\
pager\View\YMSGR_Launchcast

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion \Run

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
WorkgroupCrawler\Shares
shared = "\dllwm.exe"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Control Panel
Homepage = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\ Policies\
System
DisableTaskMgr = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\ Policies\
System
DisableRegistryTools = "1"

HKEY_CURRENT_USER\Software\Yahoo\
pager\View\YMSGR_buzz
content url = "http://{BLOCKED}o.gl/aEUGfr"

HKEY_CURRENT_USER\Software\Yahoo\
pager\View\YMSGR_Launchcast
content url = "http://{BLOCKED}o.gl/aEUGfr"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion \Run
Task Manager = "%Windows%\taskmng.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Window Title = "Microsoft Internet Explorer"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://{BLOCKED}o.gl/aEUGfr"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

Dropping Routine

This worm drops the following files:

  • %User Temp%\aut1.tmp
  • %System%\dllwm.exe

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

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}o.gl/aEUGfr/dkc.exe

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

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_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer
    • Control Panel
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Policies
    • System
  • In HKEY_CURRENT_USER\Software\Yahoo\pager\View
    • YMSGR_buzz
  • In HKEY_CURRENT_USER\Software\Yahoo\pager\View
    • YMSGR_Launchcast
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
    • Run

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Microsoft Update = "%System%\dllwm.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Windows Updater = "%User Temp%\server.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\WorkgroupCrawler\Shares
    • shared = "\dllwm.exe"
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Control Panel
    • Homepage = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Policies\System
    • DisableTaskMgr = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Policies\System
    • DisableRegistryTools = "1"
  • In HKEY_CURRENT_USER\Software\Yahoo\pager\View\YMSGR_buzz
    • content url = "http://{BLOCKED}o.gl/aEUGfr"
  • In HKEY_CURRENT_USER\Software\Yahoo\pager\View\YMSGR_Launchcast
    • content url = "http://{BLOCKED}o.gl/aEUGfr"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion \Run
    • Task Manager = "%Windows%\taskmng.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Window Title = "Microsoft Internet Explorer"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page = "http://{BLOCKED}o.gl/aEUGfr"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""

Step 6

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.
  • %User Temp%\aut1.tmp
  • %System%\dllwm.exe

Step 7

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