Trojan.Win32.MIRAI.MJZ
Backdoor:Win32/Mirai.A (Microsoft) ; Trojan.Win32.Agentb.jagl (Kaspersky)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
This Trojan 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 the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
TECHNICAL DETAILS
689,664 bytes
EXE
Engima Protector
No
04 Feb 2019
Connects to URLs/IPs, Downloads files
Arrival Details
This Trojan 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 Trojan drops the following files:
- %Windows%\System\msinfo.exe -> Detected as Trojan.Win32.SHELMA.AMC
- %Windows%\System\upslist.txt -> Contains list of URL to download additional files with corresponding file name to save it.
- %Windows%\System\my1.bat -> Contains several commands to be executed for initial machine infection
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It adds the following processes:
- cmd /c sc start xWinWpdSrv&ping 127.0.0.1 -n 10 && del
Other System Modifications
This Trojan modifies the following registry key(s)/entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Tcpip\Parameters\
Interfaces
NameServer = 223.5.5.5,8.8.8.8
Download Routine
This Trojan connects to the following URL(s) to download its component file(s):
- http://{BLOCKED}.{BLOCKED}.6.174/wpd.jpg
- http://{BLOCKED}.{BLOCKED}.247.240/ok/ups.html
- http://{BLOCKED}.{BLOCKED}.6.174/my1.html
- http://{BLOCKED}.{BLOCKED}.6/174/update.txt
It saves the files it downloads using the following names:
- http://{BLOCKED}.{BLOCKED}.6.174/update.txt -> %Windows%\System\upslist.txt
- http://{BLOCKED}.{BLOCKED}.6.174/wpd.jpg -> %Windows%\System\msinfo.exe
- http://{BLOCKED}.{BLOCKED}.6.174/my1.html -> %Windows%\System\my1.bat
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This Trojan does the following:
- It does not proceed with its download routine if the machine is not a server.
SOLUTION
9.850
14.806.03
11 Feb 2019
14.807.00
12 Feb 2019
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
Identify and terminate files detected as Trojan.Win32.MIRAI.MJZ
- 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 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters
- From: NameServer = "223.5.5.5,8.8.8.8"
To: NameServer = ""
- From: NameServer = "223.5.5.5,8.8.8.8"
Step 5
Search and delete these files
- %Windows%\System\my1.bat
- %Windows%\System\mysinfo.exe
- %Windows%\System\upslist.txt
Step 6
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.MIRAI.MJZ. 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 the following Trend Micro Support pages for more information:
Did this description help? Tell us how we did.