TROJ_FAKEMS.AB
Trojan.Win32.Spy (Ikarus)
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 as a component bundled with malware/grayware packages.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives as a component bundled with malware/grayware packages.
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\Ias
ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Ias
Description = "Internet Authentication Service"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Ias
DisplayName = "Ias Service"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Ias\Parameters
ServiceDll = "{malware path and filename}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Ias
Start = "2"
It adds and runs the following services:
- Ias Service
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\
Enum\Root\LEGACY_IAS
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Ias
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Ias\Parameters
NOTES:
This Trojan requires the following file to run its intended routine:
- %System%\tnsy39.tmp
SOLUTION
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
Restart in Safe Mode
Step 3
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\Enum\Root
- LEGACY_IAS
- LEGACY_IAS
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- Ias
- Ias
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEMS.AB. 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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