A vulnerability impacting multiple ESET products has been exploited by an APT group to load malicious DLL libraries and silently deploy malware, Kaspersky reports.

The issue, tracked as CVE-2024-11859, is described as a DLL search order hijacking flaw that could be exploited by attackers with administrative privileges for arbitrary code execution.

• Check Point Research (CPR) and Check Point Incident Response Team (CPIRT) encountered a previously unnamed ransomware strain, we dubbed Rorschach, deployed against a US-based company.
  Rorschach ransomware appears to be unique, sharing no overlaps that could easily attribute it to any known ransomware strain. In addition, it does not bear any kind of branding which is a common practice among ransomware groups.
• The ransomware is partly autonomous, carrying out tasks that are usually manually performed during enterprise-wide ransomware deployment, such as creating a domain group policy (GPO). In the past, similar functionality was linked to LockBit 2.0.
• The ransomware is highly customizable and contains technically unique features, such as the use of direct syscalls, rarely observed in ransomware. Moreover, due to different implementation methods, Rorschach is one of the fastest ransomware observed, by the speed of encryption.
• The ransomware was deployed using DLL side-loading of a Cortex XDR Dump Service Tool, a signed commercial security product, a loading method which is not commonly used to load ransomware. The vulnerability was properly reported to Palo Alto Networks.

We recently discovered ransomware, which performs MSDTC service DLL Hijacking to silently execute its payload. We have named this ransomware CatB, based on the contact email that the ransomware group uses. The sample was first uploaded to VT on November 23, 2022 and tagged by the VT community as a possible variant of the Pandora Ransomware. The assumed connection to the Pandora Ransomware was due to some similarities between the CatB and Pandora ransom notes. However, the similarities pretty much end there. The CatB ransomware implements several anti-VM techniques to verify execution on a “real machine”, followed by a malicious DLL drop and DLL hijacking to evade detection.

Raspberry Robin is a worm spread by external drives that leverages Windows Installer to download a malicious DLL.