VCrypt Ransomware

VCrypt is a newly observed ransomware tool targeting Western Europe. Unlike most ransomware, VCrypt does not encrypt files.

Threat ID:: CC-3450
Category:: Ransomware
Threat Severity:: Low
Threat Vector:
Published:: 6 May 2020 12:00 AM

Report a cyber attack: call 0300 303 5222 or email [email protected]

Summary

VCrypt is a newly observed ransomware tool targeting Western Europe. Unlike most ransomware, VCrypt does not encrypt files.

Affected platforms

The following platforms are known to be affected:

Microsoft Windows

Microsoft Windows - All versions

Threat details

At the time of publication, it is unclear how VCrypt is distributed, although there are unconfirmed reports indicating it may be delivered via spam email campaigns.

Once installed, VCrypt will unpack an embedded copy of the 7zip archiving utility, which it then uses to create multiple password-protected archives of specific directories. When complete, it attempts to delete all files contained on other drive letters before posting a ransom note

Remediation steps

Type	Step
	If a device on your network becomes infected with ransomware it will begin encrypting files, which may also include remote files on network locations. The only guaranteed way to recover from a ransomware infection is to restore all affected files from their most recent backup. To reduce the likelihood of infection by ransomware, NHS Digital advises that: Secure configurations are applied to all devices. Security updates are applied at the earliest opportunity. Tamper protection settings in security products are enabled where available. Obsolete platforms are segregated from the rest of the network. IT usage policies are reinforced by regular training to ensure all users know not to open unsolicited links or attachments. Multi-factor authentication (MFA) and lockout policies are used where practicable, especially for administrative accounts. Administrative accounts are only used for necessary purposes. Remote administration services use strongly encrypted protocols and only accept connections from authorised users or locations. Systems are continuously monitored, and unusual activity is investigated, so that a compromise of the network can be detected as early as possible. Please note that NCSC maintains guidance for securely configuring a wide range of end user device (EUD) platforms. For further details refer to their end user device security guidance pages. To limit the impact of a ransomware infection, NHS Digital advises that: Critical data is frequently saved in multiple backup locations. At least one backup is kept offline at any time (separated from live systems). Backups and incident recovery plans are tested to ensure that data can be restored when needed. User account permissions for modifying data are regularly reviewed and restricted to the minimum necessary. Infected systems are disconnected from the network and powered down as soon as practicable. Any user account credentials that may have been compromised should be reset on a clean device. Where infected systems cannot be quarantined with confidence, then an affected organisation should disconnect from national networks to limit propagation.

Type

Step

If a device on your network becomes infected with ransomware it will begin encrypting files, which may also include remote files on network locations. The only guaranteed way to recover from a ransomware infection is to restore all affected files from their most recent backup.

To reduce the likelihood of infection by ransomware, NHS Digital advises that:

Secure configurations are applied to all devices.
Security updates are applied at the earliest opportunity.
Tamper protection settings in security products are enabled where available.
Obsolete platforms are segregated from the rest of the network.
IT usage policies are reinforced by regular training to ensure all users know not to open unsolicited links or attachments.
Multi-factor authentication (MFA) and lockout policies are used where practicable, especially for administrative accounts.
Administrative accounts are only used for necessary purposes.
Remote administration services use strongly encrypted protocols and only accept connections from authorised users or locations.
Systems are continuously monitored, and unusual activity is investigated, so that a compromise of the network can be detected as early as possible.

Please note that NCSC maintains guidance for securely configuring a wide range of end user device (EUD) platforms. For further details refer to their end user device security guidance pages.

To limit the impact of a ransomware infection, NHS Digital advises that:

Critical data is frequently saved in multiple backup locations.
At least one backup is kept offline at any time (separated from live systems).
Backups and incident recovery plans are tested to ensure that data can be restored when needed.
User account permissions for modifying data are regularly reviewed and restricted to the minimum necessary.
Infected systems are disconnected from the network and powered down as soon as practicable.
Any user account credentials that may have been compromised should be reset on a clean device.
Where infected systems cannot be quarantined with confidence, then an affected organisation should disconnect from national networks to limit propagation.

Indicators of compromise

Main indicators

Target Directories

%PUBLIC%\Desktop
%PUBLIC%\Documents
%PUBLIC%\Downloads
%PUBLIC%\Music
%PUBLIC%\Pictures
%PUBLIC%\Videos
%USERPROFILE%\Desktop
%USERPROFILE%\Documents
%USERPROFILE%\Downloads
%USERPROFILE%\Music
%USERPROFILE%\Pictures
%USERPROFILE%\Videos

SHA256 File Hashes

e9056b5596854e3473033e3b28577c83a70f1b5be20e4b1cf529688ad7591b70

Last edited: 29 June 2021 12:01 pm