Worm:Win32/Nuqel.A (Microsoft); Trojan.Win32.Agent.ydn (Kaspersky); Backdoor.Trojan (Symantec); W32/YahLover.worm.gen (Nai); W32/Sohana-AO (Sophos); Trojan.Win32.AutoIT.gen (Sunbelt); Virus.Worm.AutoRun (Ikarus); Win32/Hakaglan.AG worm (NOD32)
Windows 2000, Windows XP, Windows Server 2003
This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.
It disables Task Manager, Registry Editor, and Folder Options.
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It may arrive via network shares.
It 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:
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.)
It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.
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
Yahoo Messengger = "%System%\RVHOST.exe"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe RVHOST.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
The scheduled task executes the malware at the following period:
Other System Modifications
This worm adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
WorkgroupCrawler\Shares
shared = "\{hostname}\{shared folder}\New Folder.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Schedule
AtTaskMaxHours = "0"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NofolderOptions = "1"
Propagation
This worm searches for folders in all physical and removable drives then drops copies of itself inside the folder as {folder name}.EXE.
It uses the following file names for the copies it drops into shared networks:
Other Details
This worm connects to the following possibly malicious URL:
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
Identify and delete files detected as WORM_SOHANAD.SP using either the Startup Disk or Recovery Console
Step 3
To enable Registry Editor, Task Manager, and Folder options:
Step 4
Delete this registry value
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.
Step 5
Restore this modified registry value
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.
Step 6
Search and delete these files
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_SOHANAD.SP. 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.