TROJ_SMALLTRO.SU
[00198c9a.EXE]:generic!bg.ffj (McAfee); ARC:EmbeddedEXE, PAK:[data0000]:UPX, [data0000]:Trojan-Downloader.Win32.Agent.dfsm (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Agent.16827 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
1,764,720 bytes
EXE
No
05 Apr 2012
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\
ExeLock
HKEY_CLASSES_ROOT\exefile\shell\
PWLock1
HKEY_CLASSES_ROOT\exefile\shell\
PWLock1\command
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\
ExeLock
RunOnly = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\
ExeLock
Backup = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\
ExeLock
Context = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\
ExeLock
RunOnlyUser = "Administrator"
HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\
ExeLock
PasswordPrompt = "Please enter password"
This report is generated via an automated analysis system.
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
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\SOFTWARE\Salfeld
- ExeLock
- In HKEY_CLASSES_ROOT\exefile\shell
- PWLock1
- In HKEY_CLASSES_ROOT\exefile\shell\PWLock1
- command
Step 3
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\Salfeld\ExeLock
- RunOnly = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\ExeLock
- Backup = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\ExeLock
- Context = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\ExeLock
- RunOnlyUser = "Administrator"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Salfeld\ExeLock
- PasswordPrompt = "Please enter password"
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_SMALLTRO.SU. 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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