Trojan.Win32.Dialer.ahbg (Kaspersky), W32/Dialer.AHBG!tr (Fortinet), Trojan-Dropper.Agent (Ikarus),
Windows 2000, Windows XP, Windows Server 2003
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.
However, as of this writing, the said sites are inaccessible.
Arrival Details
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.
Installation
This backdoor drops the following copies of itself into the affected system:
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It creates the following folders:
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
XXXXXXD0F7D4A7 = "%Windows%\XXXXXXD0F7D4A7\svchsot.exe"
Other Details
This backdoor connects to the following possibly malicious URL:
However, as of this writing, the said sites are inaccessible.
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
Identify and terminate files detected as BKDR_GHOSTNET.J
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.
Step 4
Search and delete these folders
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_GHOSTNET.J. 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.