TROJ_SMALL.NM
Windows 2000, Windows, XP, Windows Server 2003

Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan is a command line application which creates another file in the current directory using the file name specified as parameter.
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
TECHNICAL DETAILS
32,768 bytes
EXE
Yes
02 Dec 2011
Arrival Details
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This Trojan drops and executes the following files:
- %Current Folder%\{parameter}
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AppMgmt\Parameters
ServiceDll = "{parameter}"
(Note: The default value data of the said registry entry is %System Root%\System32\appmgts.dll.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NtmsSvc\Parameters
ServiceDll = "{parameter}"
(Note: The default value data of the said registry entry is %System Root%\System32\ntmssvc.dll.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\HidServ\Parameters
ServiceDll = "{parameter}"
(Note: The default value data of the said registry entry is %System Root%\System32\hidserv.dll.)
NOTES:
It is a command line application which creates another file in the current directory using the file name specified as parameter.
SOLUTION
9.200
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
Scan your computer with your Trend Micro product and note files detected as TROJ_SMALL.NM
Step 3
Restart in Safe Mode
Step 4
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.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AppMgmt\Parameters
- From: ServiceDll = {parameter}
To: ServiceDll = %System Root%\System32\appmgts.dll
- From: ServiceDll = {parameter}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NtmsSvc\Parameters
- From: ServiceDll = {parameter}
To: ServiceDll = %System Root%\System32\ntmssvc.dll
- From: ServiceDll = {parameter}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HidServ\Parameters
- From: ServiceDll = {parameter}
To: ServiceDll = %System Root%\System32\hidserv.dll
- From: ServiceDll = {parameter}
Step 5
Search and delete this file
- %Current Folder%\{parameter}
Step 6
Search and delete the file detected as TROJ_SMALL.NM
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SMALL.NM. 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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