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F-Secure Malware Information Pages: Trojan-Dropper:W32/Agent.REK
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Summary
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| Agent.REK drops and executes other malware applications on the infected system, thus compromising system security. |
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Additional Details
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Upon execution, Agent.REK drops and executes the following files:
- %System%\WinNt32.dll
- %System%\drivers\[Random Filename].sys
Note: %System% represents a path that is typically C:\Windows\System32.
Note: [Random Filename] represents a randomly generated filename used by the trojan at the time of infection, such as Oiv23.sys and Tqy10.sys.
The dropped files are detected as Trojan-Downloader.Win32.Agent.GLH and Trojan-Dropper.Win32.Agent.REK respectively.
This Trojan creates the following registry entries as part of its installation:
- HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\WinNt32
DLLName = "WinNt32.dll"
StartShell = WLEventStartShell - HKLM\SYSTEM\CurrentControlSet\Services\[random filename]
ImagePath = "%System%\drivers\[random filename] - HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\[random filename].sys (default) = Driver
- HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\[random filename].sys (default) = Driver
Trojan-Downloader.Win32.Agent.GLH then attempts to connect to the following IP addresses:
- 208.66.195.15
- 217.170.77.146
- 66.232.113.80
Additional Note
Files detected as Trojan-Dropper.Win32.Agent.slh have the same characteristics as Agent.REK. |
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F-Secure Corporation |
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Last Modified: June 10, 2008
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