BKDR_MIRAI.B
Trojan-Downloader.Win32.Agent.silgjq (KASPERSKY); Backdoor:Win32/Mirai (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 executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.
As of this writing, the said sites are inaccessible.
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.
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Display console window
- Start service
- Stop service
- Delete service
- Create service
- Run malware as application
- Run malware as service
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://up.{BLOCKED}s.pw:8888/
However, as of this writing, the said sites are inaccessible.
Download Routine
This Backdoor accesses the following websites to download files:
- http://up.{BLOCKED}s.pw:8888/ver.txt - the malware checks this file to determine if it needs to update itself
- http://up.{BLOCKED}s.pw:8888/update.txt
It saves the files it downloads using the following names:
- %System Root%\windows\system\upslist.txt
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
As of this writing, the said sites are inaccessible.
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Identify and terminate files detected as BKDR_MIRAI.B
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- 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.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 5
Search and delete these files
- %System Root%\windows\system\upslist.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_MIRAI.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.
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_MIRAI.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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