WastedLocker Ransomware

WastedLocker is a newly observed ransomware tool believed to have been created but the TA505 advanced persistent threat group for use in their own campaigns.

Threat ID:: CC-3515
Category:: Ransomware
Threat Severity:: Low
Threat Vector:
Published:: 25 June 2020 12:00 AM

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

Summary

WastedLocker is a newly observed ransomware tool believed to have been created but the TA505 advanced persistent threat group for use in their own campaigns.

Affected platforms

The following platforms are known to be affected:

Microsoft Windows

Microsoft Windows - All versions

Threat details

As with other TA505 tools, WastedLocker is delivered via fake software updates displayed on compromised sites using the Domen exploit kit. When a user interacts with one of these sites a Cobalt Strike payload is delivered to act as an initial foothold on the target network. TA505 then use this foothold to propagate across the network before deploying WastedLocker.

Once delivered, WastedLocker will attempt to Doppelpaymer, WastedLocker does not appear to extract data before encryption

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

Filepaths

[file_name].info
%AppData%\Service:bin
%AppData%\Arbiters:bin

Last edited: 10 January 2022 2:57 pm