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Win32/Reveton


Microsoft security software detects and removes this threat.

This threat locks your PC and displays a full-screen message, commonly called a "lock screen".

It pretends to be from the FBI or a national police force and tries to scare you into paying a fine to unlock your PC.

See the Technical information tab for examples of the lock screen.

Typically, this threat gets on your PC when you visit a hacked webpage.

You can read more about this type onfmalware at the Ransom:Win32/Reveton family description or on our ransomware page.

Find out ways that malware can get on your PC.



What to do now

Microsoft doesn’t recommend you pay the fine.  There is no guarantee that paying the ransom will give you access to your files.

If you've already paid, see our ransomware page for help on what to do now.

Run antivirus or antimalware software

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

Advanced troubleshooting

To restore your PC, you might need to download and run Windows Defender Offline. See our advanced troubleshooting page for more help.

You can also ask for help from other PC users at the Microsoft virus and malware community.

If you’re using Windows XP, see our Windows XP end of support page.

Threat behavior

Win32/Reveton is a family of ransomware that locks your PC and displays a full-screen message (commonly called a "lock screen") pretending to be from the FBI or some other national police force. Then, it tries to convince you to pay a fine to unlock your PC.

Installation

Some Ransom:Win32/Reveton variants copy themselves to your PC using the following naming scheme:

  • %ALLUSERPROFILE%\Application Data\<reverse string of the filename>.<reverse string of extension name>

For example, if the original file name is malware.dll, the copy's name is erawlam.lld.

Other variants copy themselves to the above location using random file names with the extension .cpp, .dat, .jss, or .plz. For example, %ALLUSERPROFILE%\Application Data\6j1fqm4L.plz.

Certain variants make the following changes to the registry so that the ransomware runs each time you start your PC:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "Task Scheduler"
With data: "%ALLUSERPROFILE%\Application Data\task scheduler\task scheduler.exe"

In subkey: HKLM\System\ControlSet001\services\Winmgmt\Parameters
Sets value: "ServiceDll"
With data: "%ALLUSERPROFILE%\Application Data\<random>.plz"

They might also inject themselves into these legitimate Windows processes to hide their actions:

  • explorer.exe
  • regedit.exe - hooks the function RegQueryValueExW in advapi32.dll to hide its registry keys
  • taskmgr.exe - hooks the function ZwQuerySystemInformation in ntdll.dll to hide its processes

These registry entries might be created by a registry file that Reveton drops onto your PC in the %ALLUSERPROFILE%\Application Data directory using a file name that is usually the same as the copied component, but with a .reg extension. For example:

Some new variants drop their files in %ALLUSERPROFILE%\Application Data\2992199f9a\.

This file might be detected as a Ransom:WinREG/Reveton variant, such as Ransom:WinREG/Reveton.A and Ransom:WinREG/Reveton.B.

Some Reveton variants might also add their dropped copy to the Data Execution Prevention (DEP) exception list. The variants do this to bypass certain checks made in Windows that would otherwise prevent the threat from running. The variants do this by making the following registry modification:

In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
Sets value: "%ALLUSERPROFILE%\Application Data\task scheduler\Task Scheduler.exe"
With data: "disablenxshowui"

Some variants of Ransom:Win32/Reveton create the following shortcut file in the <startup folder> to ensure the ransomware loads every time you log on. The ransomware also uses the following names:

  • ctfmon.lnk
  • regmonstd.lnk
  • runctf.lnk
  • task scheduler.lnk

Variants such as Ransom:Win32/Reveton.X and Ransom:Win32/Reveton.Y create the shortcut using a random file name consistent of letters and digits. For example, jw2gf7j6.lnk.

This file is detected as Ransom:Win32/Reveton!lnk.

The ransomware also runs by manually clicking the shortcut.

Some Ransom:Win32/Reveton variants might also drop a copy of rundll32.exe in the %USERPROFILE%\application data directory with the file name lsass.exe. This file is then used to launch the ransomware. For example, lsass.exe <folder path>\<malware file name>.dll, GOF1

Other variants, such as Ransom:Win32/Reveton.X and Ransom:Win32/Reveton.Y launch the ransomware using the original rundll32.exe file located in <system folder>.

In some older variants of Ransom:Win32/Reveton, the ransomware creates a shortcut file with the file name <random file name>.dll.lnk.

Distribution

Typically, Ransom:Win32/Reveton is installed on a PC as a result of a drive-by download attack. For example, an exploit pack (such as Blacole and Axpergle) can install it, or you might encounter it if you visit a compromised webpage.

We have seen Exploit:Win32/Pdfjsc.ADY and Exploit:Win32/Pdfjsc.ADQ download Ransom:Win32/Reveton onto compromised PCs.

Payload

Prevents you from using your PC

As part of its payload, Ransom:Win32/Reveton displays a full-screen webpage that covers all other windows, rendering your PC unusable. The image is a fake warning pretending to be from a legitimate institution which demands the payment of a fine.

Paying the "fine" will not necessarily return your PC to a usable state.

Some examples of localized images that variants of Ransom:Win32/Reveton might display are reproduced here.

An image of a lock screen pretending to be from the United States Department of Homeland Security:

 

An image of a lock screen pretending to be from the Department of Justice, USA:

An image of a lock screen pretending to be from New Scotland Yard, Metropolitan Police and Strathclyde Police:

An image of a lock screen pretending to be from the Bundespolizei, or German Federal Police, National Cyber Crimes Unit:

Images of lock screens pretending to be from the Federal Bureau of Investigation, or FBI:

An image of a lock screen pretending to be from the Computer Crime & Intellectual Property Section of the United States Department of Justice:

 

An image of a lock screen pretending to be from the Cuerpro Nacional De Policia, or National Police Corps of Spain:

An image of a lock screen pretending to be from the Guardia di Finanza, or Italian Financial Guard:

Downloads and runs other malware components

Ransom:Win32/Reveton can download and run customized .dll file payloads, such as the following:

  • Lock.dll, which the ransomware injects into browser process, including the following files, to display the fraudulent message:
    • chrome.exe
    • firefox.exe
    • iexplore.exe
    • opera.exe
  • FileMem.dll, which is an encrypted file that can perform different payloads, including information-stealing routines, and might be detected as PWS:Win32/Reveton

Reveton can also download a .dll file that it stores in a container file with a random name and a .bbr, .bxx, .dat, .fee, .pff, or .pad extension. For example, e8al.pad and rodolcdod.pff.

It puts this file in the %ALLUSERPROFILE%\Application Data or %TEMP% folders. This .dll file is used to display the lock screen message and can be detected as Ransom:Win32/Reveton.U or Ransom:Win32/Reveton.V.

It might load these files into memory, instead of downloading them to a specific location on your PC.

In the wild, variants of Ransom:Win32/Reveton download these .dll files, images, and other bundled malware from the following IP addresses, using port 80 or 443:

  • 37.139.53.204
  • 37.139.53.244
  • 46.165.220.180
  • 58.107.26.174
  • 62.212.82.37
  • 82.192.88.13
  • 85.143.166.132
  • 85.143.166.136
  • 146.185.218.52
  • 146.185.255.194
  • 195.191.56.194
  • 195.208.185.33
  • 199.115.114.209
  • 199.189.105.124
  • 204.45.15.202
  • whatwillber.com<
  • willber.com

Modifies Internet browser settings

Some variants of Ransom:Win32/Reveton might modify Internet Explorer settings by making a number of registry modifications.

Disable Internet Explorer security warnings:

In subkey: HKCU\Software\Microsoft\Internet Explorer\Main
Sets value: "NoProtectedModeBanner"
With data: "1"

Lock the Internet Explorer toolbar:

In subkey: HKCU\Software\Microsoft\Internet Explorer\Toolbar
Sets value: "Locked"
With data: "1"

Lower Internet zone security settings:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
Sets value: "1609"
With data: "0"

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
Sets value: "1609"
With data: "0"

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2
Sets value: "1609"
With data: "0"

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
Sets value: "1609"
With data: "0"

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4
Sets value: "1609"
With data: "0"

Modifies system settings

Some variants might disable the Task Manager by making the following registry modification:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
Sets value: "DisableTaskMgr"
With data: "1"

Some Reveton variants might also prevent icons from displaying on your desktop by making the following registry modification:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Sets value: "HideIcons"
With data: "1"

Ends processes

To prevent you from ending the malware process, some variants of Ransom:Win32/Reveton might end the process taskmgr.exe as soon as it runs.

Additional information

The origin of the name Reveton was taken from the first variant (Ransom:Win32/Reveton.A) that contains the string "NOTEVER". It is the reversed string for "REVETON".

We have observed that Win32/Reveton uses a variety of legitimate payment and financial transfer services, including:

These providers are not affiliated with Win32/Reveton.

If you believe you are a victim of fraud involving one of these services, contact them along with your local authorities.

Related encyclopedia entries

Ransom:Win32/Reveton!lnk

PWS:Win32/Reveton

Analysis by Amir Fouda and Edgardo Diaz


Symptoms

The following can indicate that you have this threat on your PC:
  • You have these files:

    <startup folder>\ctfmon.lnk
    <startup folder>\task scheduler.lnk
    <startup folder>\runctf.lnk
    <startup folder>\<random file name>.dll.lnk
    Lock.dll
    FileMem.dll


  • You see these entries or keys in your registry:

    In subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
    Sets value: "%ALLUSERPROFILE%\Application Data\task scheduler\Task Scheduler.exe"
    With data: "disablenxshowui"

    In subkey: HKCU\Software\Microsoft\Internet Explorer\Main
    Sets value: "NoProtectedModeBanner"
    With data: "1"

    In subkey: HKCU\Software\Microsoft\Internet Explorer\Toolbar
    Sets value: "Locked"
    With data: "1"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    Sets value: "1609"
    With data: "0"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
    Sets value: "1609"
    With data: "0"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2
    Sets value: "1609"
    With data: "0"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    Sets value: "1609"
    With data: "0"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4
    Sets value: "1609"
    With data: "0"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
    Sets value: "DisableTaskMgr"
    With data: "1"

    In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    Sets value: "HideIcons"
    With data: "1"

  • The display of images as shown in the Payload section

Prevention


Alert level: Severe
This entry was first published on: Aug 30, 2012
This entry was updated on: Nov 07, 2014

This threat is also detected as:
  • FBI virus (other)
  • FBI moneypak (other)
  • Lockscreen (other)