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New KillDisk variant targets Windows machines in financial organizations in Latin America

CyberWisdom Safe Harbor Commentary:

securityaffairs.co discusses an interesting post that Trend Micro malware researchers have discovered a new variant of the infamous KillDisk disk scavenger malware. This KillDisk variant, known as TROJ_KILLDISK.IUB, is involved in a cyberattack against a Latin American financial institution that is provided by a different piece of malware or may be part of a larger attack.

“We encountered a new variant of KillDisk for Disk Erase for Latin American financial institutions.” Trend Micro released a preliminary analysis.

This latest variant targets Windows machines deleting any file stored on drives, except for system files and folders.

“The malware attempts to wipe \.\PhysicalDrive0 to \.\PhysicalDrive4. It reads the Master Boot Record (MBR) of every device it successfully opens and proceeds to overwrite the first 0x20 sectors of the device with “0x00”. It uses the information from the MBR to do further damage to the partitions it lists.” states Trend Micro. “If the partition it finds is not an extended one, it overwrites the first 0x10 and last sectors of the actual volume. If it finds an extended partition, it will overwrite the Extended Boot Record (EBR) along with the two extra partitions it points to.”

Once the malware has deleted and overwritten files and folders it attempts to terminate several processes to force the machine reboots.

The processed targeted by the malware are:

  • Client/server run-time subsystem (csrss.exe)
  • Windows Start-Up Application (wininit.exe)
  • Windows Logon Application (winlogon.exe)
  • Local Security Authority Subsystem Service (lsass.exe)

Trend Micro is still investigating this news KillDisk variant, meantime it is inviting companies to adopt a “defense in depth” approach securing the perimeters from gateways, endpoints, and networks to servers.

A new variant of the infamous disk-wiper malware KillDisk has been spotted by malware researchers at Trend Micro while targeting financial organizations in Latin America. A new variant of the infamous disk-wiper malware KillDisk has been spotted by malware researchers at Trend Micro. This variant of KillDisk, tracked as TROJ_KILLDISK.IUB, was involved in cyber attacks against financial Engaging post, Read More…

thumbnail courtesy of securityaffairs.co

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