BKDR_SARHUST.A - Threat Encyclopedia | Trend Micro (US)
By Analysis by: Abraham Latimer Camba
Archived: 2026-04-05 17:32:58 UTC
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:
TROJ_ARTIEF.PT
Installation
This backdoor drops the following non-malicious files:
%Temp%\Debug.log - malware's log file
%Temp%\wmiprvse.ini
(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:
HUSSARINI
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:
Create files
Read files
Modify files
https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/bkdr_sarhust.a
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Execute files
Get file information
Download additional components
It connects to the following URL(s) to send and receive commands from a remote malicious user:
http://{BLOCKED}i.{BLOCKED}s-mail.com
It posts the following information to its command and control (C&C) server:
User name
Computer name
OS information
CPU information
Other Details
This backdoor creates the following event(s):
HussarCreate
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
Remove the malware/grayware file that dropped/downloaded BKDR_SARHUST.A
TROJ_ARTIEF.PT
Step 3
Identify and terminate files detected as BKDR_SARHUST.A
[ Learn More ]
a. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete
it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
b. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing
the next steps.
Step 4
Delete this registry value
[ Learn More ]
https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/bkdr_sarhust.a
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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_CURRENT_USER\Software\Microsoft
IntervalTime = "{random number}"
In HKEY_CURRENT_USER\Software\Microsoft
ServerID = "{random number}"
Step 5
Search and delete these files
[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and
Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search
result.
%Temp%\Debug.log
%Temp%\wmiprvse.ini
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.
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Source: https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/bkdr_sarhust.a
https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/bkdr_sarhust.a
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