BKDR_DAREMR.A
Troj/Daremr-A (Sophos), Trojan.Win32.Agent.hkpe (Kaspersky), Trojan.Win32.Agent (Ikarus)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit), Windows Server 2008
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
It does not have any downloading capability.
It retrieves specific information from the affected system.
TECHNICAL DETAILS
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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- NamMuexObctSpeSp
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Manage Files
- Manage Processes
- Manage Registries
- Manage Windows
- Perform Remote Shell
It connects to the following websites to send and receive information:
- host.{BLOCKED}c.com:1863
Dropping Routine
This backdoor drops the following files:
- %All Users Profile%\Start Menu\Programs\Startup\Internet Explorer.lnk
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)
Download Routine
This backdoor does not have any downloading capability.
Information Theft
This backdoor retrieves the following information from the affected system:
- OS Version
- Computer Name
- User Name
- Drive Information
NOTES:
This backdoor creates a shortcut file pointing to the malware itself.
It executes the following command:
C:\Windows\system32\cmd.exe /c
"C:\program files\common files\system\msadc\msdaremr.bat"
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Search and delete these files
- %All Users Profile%\Start Menu\Programs\Startup\Internet Explorer.lnk
- %Program Files%\common files\system\msadc\msdaremr.bat
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_DAREMR.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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