Windows 2000, Windows XP, Windows Server 2003
This backdoor may be dropped by other malware.
It executes commands from a remote malicious user, effectively compromising the affected system.
It creates an event.
Arrival Details
This backdoor may be dropped by the following malware:
Installation
This backdoor drops the following non-malicious files:
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft
IntervalTime = "{random number}"
HKEY_CURRENT_USER\Software\Microsoft
ServerID = "{random number}"
Backdoor Routine
This backdoor 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:
It posts the following information to its command and control (C&C) server:
Other Details
This backdoor creates the following event(s):
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 3
Identify and terminate files detected as BKDR_SARHUST.A
Step 4
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 5
Search and delete these files
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_SARHUST.A. 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.