TROJ_BRUTER.CP
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan may arrive bundled with malware packages as a malware component. 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 requires its main component to successfully perform its intended routine.
TECHNICAL DETAILS
45,056 bytes
No
07 Aug 2015
Arrival Details
This Trojan may arrive bundled with malware packages as a malware component.
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 Trojan drops the following files:
- %Temp%\system\wmplog09c.sqm
(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)
It drops the following copies of itself into the affected system:
- %Temp%\system\svchost.exe
(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)
Autostart Technique
This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
Type = "110"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
ImagePath = "%Temp%\system\svchost.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
DisplayName = "Network Access Protection"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
Description = "Allows windows clients to participate in Network Access Protection"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
FailureActions = "{hex values}"
It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napsrv
Other Details
This Trojan requires its main component to successfully perform its intended routine.
SOLUTION
9.750
11.840.02
07 Aug 2015
11.841.00
08 Aug 2015
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 key
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\SYSTEM\CurrentControlSet\Services
- napsrv
- napsrv
Step 5
Search and delete this file
- %Temp%\system\wmplog09c.sqm
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BRUTER.CP. 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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