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Win32/Jenxcus
Severe |Detected with Windows Defender Antivirus
Aliases: No associated aliases
Summary
Windows Defender detects and removes this threat.
This threat can give a malicious hacker access and control of your PC. It can also collect your personal information and send it to a malicious hacker.
Typically, this threat gets onto your PC from a drive-by download attack. It can also be installed when you visit a compromised webpage or use an infected removable drive.
Use the following free Microsoft software to detect and remove this threat:
- Windows Defender Antivirus for Windows 10 and Windows 8.1, or Microsoft Security Essentials for Windows 7 and Windows Vista
- Microsoft Safety Scanner
- Microsoft Windows Malicious Software Removal Tool
You should also run a full scan. A full scan might find other, hidden malware.
Protect your sensitive information
This threat tries to steal your sensitive and confidential information. If you think your information has been stolen, see:
You should change your passwords after you've removed this threat:
Disable Autorun
This threat tries to use the Windows Autorun function to spread via removable drives, like USB flash drives. You can disable Autorun to prevent worms from spreading:
Scan removable drives
Remember to scan any removable or portable drives. If you have Microsoft security software, see this topic on our software help page:
Enable MAPS
Enable the Microsoft Active Protection Service (MAPS) on your system to protect your enterprise software security infrastructure in the cloud.
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Check if MAPS is enabled in your Microsoft security product:
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Select Settings and then select MAPS.
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Select Advanced membership, then click Save changes. With the MAPS option enabled, your Microsoft anti-malware security product can take full advantage of Microsoft's cloud protection service.
- Join the Microsoft Active Protection Service Community.
Get more help
You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.
If you’re using Windows XP, see our Windows XP end of support page.
Threat behavior
Installation
Win32/Jenxcus installs itself in one of the following folders:
This threat can be installed with any of these file names:
- njw0rm.exe
- WinAuto.exe
- WinAutoi.exe
It copies itself to the following location to make sure it runs each time you start your PC:
- <startup folder> \"<malware file name>", for example <startup folder>\njw0rm.exe
It changes the following registry entry so that it runs each time you start your PC:
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run or HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "<malware file name>", for example, "njw0rm.exe"
With data: "<malware folder and file name>", for example, "%TEMP%\njw0rm.exe"
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run or HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "<malware file name>", for example, "njw0rm.exe"
With data: "<malware folder and file name>", for example, "%TEMP%\njw0rm.exe"
Spreads via...
Removable drives
If this worm detects a removable drive connected to your PC, it copies itself into the root folder of that drive. It also creates a shortcut link pointing to its copy in the removable drive.
Typically, this threat gets onto your PC from a drive-by download attack. It might also have installed itself onto your PC if you visit a compromised webpage or if you use an infected removable drive.
Payload
Gives a hacker access and control of your PC
Win32/Jenxcus can give a malicious hacker access and control of your PC to:
- Run files
- Steal your online user names and passwords and the website where you entered them
- Update files
- Uninstall itself
It also sends information about your PC to a malicious hacker, such as the following:
- IP addresses visited
- Connected USB drives
- Active windows
- Users
- Operating system
This worm can connect to the following domains using a random port (usually port 1888):
- a.servecounterstrike.com
- eqe.sytes.net
- jnj.redirectme.net
- winlogon.servecounterstrike.com
- 3dmntk.no-ip.biz
Analysis by Zhitao Zhou
Prevention
The following symptoms can indicate that you have this threat on your PC:
- You have these files:
njw0rm.exe
WinAuto.exe
WinAutoi.exe - You see these entries or keys in your registry:
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run or HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "<malware file name>", for example, "njw0rm.exe"
With data: "<malware folder and file name>", for example, "%TEMP%\njw0rm.exe"In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run or HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "<malware file name>", for example, "njw0rm.exe"
With data: "<malware folder and file name>", for example, "%TEMP%\njw0rm.exe"
