Ransomware Gangs Exploiting Home windows Print Spooler Vulnerabilities


Ransomware operators corresponding to Magniber and Vice Society are actively exploiting vulnerabilities in Home windows Print Spooler to compromise victims and unfold laterally throughout a sufferer’s community to deploy file-encrypting payloads on focused methods.

“A number of, distinct risk actors view this vulnerability as enticing to make use of throughout their assaults and will point out that this vulnerability will proceed to see extra widespread adoption and incorporation by numerous adversaries transferring ahead,” Cisco Talos said in a report revealed Thursday, corroborating an independent analysis from CrowdStrike, which noticed situations of Magniber ransomware infections focusing on entities in South Korea.

Stack Overflow Teams

Whereas Magniber ransomware was first noticed in late 2017 singling out victims in South Korea by malvertising campaigns, Vice Society is a brand new entrant that emerged on the ransomware panorama in mid-2021, primarily focusing on public faculty districts and different instructional establishments. The assaults are mentioned to have taken place since no less than July 13.

Since June, a collection of “PrintNightmare” points affecting the Home windows print spooler service has come to mild that might allow distant code execution when the element performs privileged file operations –

  • CVE-2021-1675 – Home windows Print Spooler Distant Code Execution Vulnerability (Patched on June 8)
  • CVE-2021-34527 – Home windows Print Spooler Distant Code Execution Vulnerability (Patched on July 6-7)
  • CVE-2021-34481 – Home windows Print Spooler Distant Code Execution Vulnerability (Patched on August 10)
  • CVE-2021-36936 – Home windows Print Spooler Distant Code Execution Vulnerability (Patched on August 10)
  • CVE-2021-36947 – Home windows Print Spooler Distant Code Execution Vulnerability (Patched on August 10)
  • CVE-2021-34483 – Home windows Print Spooler Elevation of Privilege Vulnerability (Patched on August 10)
  • CVE-2021-36958 – Home windows Print Spooler Distant Code Execution Vulnerability (Unpatched)

CrowdStrike famous it was capable of efficiently stop makes an attempt made by the Magniber ransomware gang at exploiting the PrintNightmare vulnerability.

Prevent Data Breaches

Vice Society, alternatively, leveraged quite a lot of methods to conduct post-compromise discovery and reconnaissance previous to bypassing native Home windows protections for credential theft and privilege escalation.

Ransomware

Particularly, the attacker is believed to have used a malicious library related to the PrintNightmare flaw (CVE-2021-34527) to pivot to a number of methods throughout the setting and extract credentials from the sufferer.

“Adversaries are consistently refining their strategy to the ransomware assault lifecycle as they try to function extra successfully, effectively, and evasively,” the researchers mentioned. “Using the vulnerability often known as PrintNightmare exhibits that adversaries are paying shut consideration and can rapidly incorporate new instruments that they discover helpful for numerous functions throughout their assaults.”





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