WORM_RETADUP.SMNH
Troj/AutoIt-CFN (SOPHOS_LITE); Win32/AutoHK.NAP trojan (NOD32)
Windows
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.
It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.
TECHNICAL DETAILS
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 creates the following folders:
- {Drive Letter}:\{Infected Folder}\{Random 21 Characters}
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
{Random 21 Characters} = {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt
It drops the following files:
- {Drive Letter}:\{Infected Folder}\{Infected Folder Name} copy {Random 3 Characters}.lnk
- {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe
Propagation
This Worm drops the following copy of itself in all physical and removable drives:
- {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt
Other Details
This Worm connects to the following possibly malicious URL:
- http://{BLOCKED}ha.{BLOCKED}oob.com:9898
- http://{BLOCKED}lpha.{BLOCKED}age.com:9898
- http://{BLOCKED}lpha.{BLOCKED}ersage.com:3333
- http://{BLOCKED}ha.{BLOCKED}gamezer.com:9333
- http://{BLOCKED}ha.{BLOCKED}oob.com:9999
- http://{BLOCKED}ner.{BLOCKED}vm.com:9898
It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.
It adds the following scheduled tasks:
- Task Name: {Random 21 Characters}
Schedule: Every 1 minute
Task to be executed: "{Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt"
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
Restart in Safe Mode
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
- {Random 21 Characters} = {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt
- {Random 21 Characters} = {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt
Step 5
Deleting Scheduled Tasks
The following {Task Name} - {Task to be run} listed should be used in the steps identified below:
- {Random 21 Characters} - {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.exe {Drive Letter}:\{Infected Folder}\{Random 21 Characters}\{Random 21 Characters}.txt
For Windows 2000, Windows XP, and Windows Server 2003:
- Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
System Tools>Scheduled Tasks. - Locate each {Task Name} values listed above in the Name column.
- Right-click on the said file(s) with the aforementioned value.
- Click on Properties. In the Run field, check for the listed {Task to be run}.
- If the strings match the list above, delete the task.
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open the Windows Task Scheduler. To do this:
• On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
• On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter. - In the left panel, click Task Scheduler Library.
- In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
- In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
- If the said string is found, delete the task.
Step 6
Search and delete this folder
Step 7
Search and delete these files
- {Drive Letter}:\{Infected Folder}\{Infected Folder Name} copy {Random 3 Characters}.lnk
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_RETADUP.SMNH. 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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