WORM_DUMPY.XXPZ
Worm:Win32/Dumpy.A (Microsoft), a variant of Win32/Agent.NPL worm (Nod32)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives via removable drives. It 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
Arrival Details
This worm arrives via removable drives.
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:
- %System Root%\WinShell\WinSeven.exe
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
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
WinShell = "%System Root%\WinShell\WinSeven.exe"
Propagation
This worm enumerates the following drives of the affected system:
- A: to Y:
It drops the following copy(ies) of itself in all removable drives:
- {drive}\{subfolders}\{folder name}.exe
This worm searches for folders in all removable drives then drops copies of itself inside the folder as {folder name}.exe.
Process Termination
This worm terminates the following processes if found running in the affected system's memory:
- iexplore.exe
- firefox.exe
- notepad.exe
- regedit.exe
- powerpnt.exe
- winword.exe
- taskmgr.exe
SOLUTION
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Identify and terminate files detected as WORM_DUMPY.XXPZ
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- WinShell = "%System Root%\WinShell\WinSeven.exe"
- WinShell = "%System Root%\WinShell\WinSeven.exe"
Step 5
Scan your computer with your Trend Micro product to delete files detected as WORM_DUMPY.XXPZ. 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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