BKDR64_BEDEP.B
Backdoor:Win64/Bedep.A (Microsoft)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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 arrives as a component bundled with malware/grayware packages.
It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
As of this writing, the said sites are inaccessible.
It requires its main component to successfully perform its intended routine.
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.
It arrives as a component bundled with malware/grayware packages.
Installation
This backdoor injects codes into the following process(es):
- explorer.exe
- iexplore.exe
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- download and execute arbitrary files
- update self
It connects to the following websites to send and receive information:
- {BLOCKED}hgfrhicr.com
It posts the following information to its command and control (C&C) server:
- buildId
- botId
- processor (32 or 64-bit)
- OS version
As of this writing, the said sites are inaccessible.
Download Routine
This backdoor accesses the following websites to download files:
- http://{BLOCKED}askolfa.com/ads.php?sid={build id}
As of this writing, the said sites are inaccessible.
Other Details
This backdoor requires its main component to successfully perform its intended routine.
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
Scan your computer with your Trend Micro product and note files detected as BKDR64_BEDEP.B
Step 3
Restart in Safe Mode
Step 4
Search and delete the files detected as BKDR64_BEDEP.B
*Note: Some component files may be 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.
To stop the malware/grayware from running when certain files are opened:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type the name of the file that was detected earlier.
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012 (R2):
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
- In the Search Computer/This PC input box, type the name of the file that was detected earlier.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR64_BEDEP.B. 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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