Kroll has identified two different file exfiltration methodologies leveraged by threat actors, primarily CLOP, during recent engagements involving the exploitation of the MOVEit vulnerability (CVE-2023-34362) throughout May and June 2023. In the vast majority of Kroll’s global MOVEit investigations, the primary data exfiltration method consisted of utilizing the dropped web shell to inject a session or create a malicious account (named Method 1 for this piece).

Ghostscript, an open-source interpreter for the PostScript language and PDF files, recently disclosed a vulnerability prior to the 10.01.2 version. This vulnerability CVE-2023-36664 was assigned a CVSS score of 9.8 that could allow for code execution caused by Ghostscript mishandling permission validation for pipe devices (with the %pipe% or the | pipe character prefix). Debian released a security advisory mentioning possible execution of arbitrary commands.