TROJ_CALELK.SMI
VirTool:Win32/VBInject.gen!FU (Microsoft); PWS-Zbot.gen.ku (McAfee); Trojan.Gen (Symantec); PAK:UPX, Trojan-Ransom.Win32.PornoBlocker.dmr, Trojan-Ransom.Win32.PornoBlocker.dmr (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.114531 (FSecure)
Windows 2000, XP, 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
56,832 bytes
EXE
No
08 Oct 2011
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.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
wuaucldt = "%System%\wuaucldt.exe"
Other System Modifications
This Trojan deletes the following files:
- {malware path and file name}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
wuaucldt = "%User Profile%\wuaucldt.exe"
Dropping Routine
This Trojan drops the following files:
- %System%\wuaucldt.exe
- %User Profile%\wuaucldt.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Restart in Safe Mode
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\Microsoft\Windows\CurrentVersion\Run
- wuaucldt="%System%\wuaucldt.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- wuaucldt="%User Profile%\wuaucldt.exe"
Step 4
Search and delete these components
- %System%\wuaucldt.exe
- %User Profile%\wuaucldt.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CALELK.SMI. 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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