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This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes commands from a remote malicious user, effectively compromising the affected system.
This backdoor drops the following copies of itself into the affected system:
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
This backdoor modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WinlogonShell = "Explorer.exe %Windows%\ThunderUpdate.exe"
(Note: The default value data of the said registry entry is Explorer.exe.)
This backdoor opens the following port(s) where it listens for remote commands:
It executes the following commands from a remote malicious user:
It connects to the following URL(s) to send and receive commands from a remote malicious user:
This backdoor creates a thread that continuously receives IP addresses from the from a host botnet. It then creates a thread for each IP address received and waits for remote commands.
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Identify and terminate files detected as BKDR_HELOAG.SM
To terminate the malware/grayware/spyware process:
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.
To restore the registry value this malware/grayware modified:
Scan your computer with your Trend Micro product to delete files detected as BKDR_HELOAG.SM. 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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