Virus.Win32.LAMER.F
Virus.Win32.Lamer.cb (KASPERSKY)
Windows
Threat Type: Virus
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Virus arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It prepends its codes to target files.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It does not have any backdoor routine.
It does not have any downloading capability.
It does not have any information-stealing capability.
TECHNICAL DETAILS
1,098,760 bytes
EXE
Delphi
Yes
04 Nov 2021
Drops files
Arrival Details
This Virus 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 Virus drops the following copies of itself into the affected system:
- %System%\HelpMe.exe
- {Drive Letter}\AutoRun.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following processes:
- %System%\HelpMe.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This Virus adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = Explorer.exe HelpMe.exe
It adds the following lines or registry entries as part of its routine:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- CheckedValue = 0
It drops the following file(s) in the Startup Items folder to enable its automatic execution at every system startup:
- %User Startup%\Soft.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
File Infection
This Virus prepends its codes to target files.
It avoids infecting the following files:
- %System%\HelpMe.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Propagation
This Virus drops copies of itself in the following drives:
- Fixed
- Network
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
open=AutoRun.exe
shell\1=Open
shell\1\Command=AutoRun.exe
shell\2\=Browser
shell\2\Command=AutoRun.exe
shellexecute=AutoRun.exe
Backdoor Routine
This Virus does not have any backdoor routine.
Rootkit Capabilities
This Virus does not have rootkit capabilities.
Download Routine
This Virus does not have any downloading capability.
Information Theft
This Virus does not have any information-stealing capability.
Other Details
This Virus does not exploit any vulnerability.
SOLUTION
9.800
17.174.02
05 Nov 2021
17.175.00
06 Nov 2021
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- TROJ.Win32.TRX.XXPE50FFF050
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 3
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 4
Restart in Safe Mode
Step 5
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- Shell = Explorer.exe HelpMe.exe
- Shell = Explorer.exe HelpMe.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- CheckedValue = 0
- CheckedValue = 0
Step 6
Search and delete these files
- %System%\HelpMe.exe
- %User Startup%\Soft.lnk
- {Drive Letter}\AutoRun.exe
Step 7
Search and delete AUTORUN.INF files created by Virus.Win32.LAMER.F that contain these strings
- open=AutoRun.exe
- shell\1=Open
- shell\1\Command=AutoRun.exe
- shell\2\=Browser
- shell\2\Command=AutoRun.exe
- shellexecute=AutoRun.exe
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Virus.Win32.LAMER.F. 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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