Ransomware operators such as Magniber and Vice Culture are actively exploiting vulnerabilities in Windows Print Spooler to compromise victims and unfold laterally across a victim’s network to deploy file-encrypting payloads on qualified systems.
“Various, distinct threat actors look at this vulnerability as desirable to use for the duration of their attacks and may perhaps suggest that this vulnerability will continue on to see a lot more common adoption and incorporation by various adversaries going forward,” Cisco Talos explained in a report posted Thursday, corroborating an independent evaluation from CrowdStrike, which observed scenarios of Magniber ransomware infections targeting entities in South Korea.
Though Magniber ransomware was to start with spotted in late 2017 singling out victims in South Korea by way of malvertising campaigns, Vice Society is a new entrant that emerged on the ransomware landscape in mid-2021, primarily concentrating on community college districts and other instructional institutions. The attacks are stated to have taken area considering that at the very least July 13.
Considering the fact that June, a collection of “PrintNightmare” issues impacting the Windows print spooler provider has come to gentle that could help remote code execution when the component performs privileged file functions –
- CVE-2021-1675 – Windows Print Spooler Distant Code Execution Vulnerability (Patched on June 8)
- CVE-2021-34527 – Windows Print Spooler Distant Code Execution Vulnerability (Patched on July 6-7)
- CVE-2021-34481 – Windows Print Spooler Distant Code Execution Vulnerability (Patched on August 10)
- CVE-2021-36936 – Windows Print Spooler Remote Code Execution Vulnerability (Patched on August 10)
- CVE-2021-36947 – Windows Print Spooler Distant Code Execution Vulnerability (Patched on August 10)
- CVE-2021-34483 – Windows Print Spooler Elevation of Privilege Vulnerability (Patched on August 10)
- CVE-2021-36958 – Windows Print Spooler Remote Code Execution Vulnerability (Unpatched)
CrowdStrike noted it was in a position to correctly prevent tries manufactured by the Magniber ransomware gang at exploiting the PrintNightmare vulnerability.
Vice Culture, on the other hand, leveraged a selection of methods to carry out put up-compromise discovery and reconnaissance prior to bypassing native Windows protections for credential theft and privilege escalation.
Particularly, the attacker is considered to have made use of a malicious library associated with the PrintNightmare flaw (CVE-2021-34527) to pivot to several methods throughout the setting and extract credentials from the sufferer.
“Adversaries are continually refining their strategy to the ransomware attack lifecycle as they strive to run more successfully, efficiently, and evasively,” the scientists explained. “The use of the vulnerability recognised as PrintNightmare reveals that adversaries are paying out near focus and will immediately incorporate new equipment that they discover beneficial for a variety of applications all through their attacks.”
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