Threats tagged 'msp targeting'

Starting October 7, 2026, attackers exploited two critical vulnerabilities in AhsayCBS backup utility (CVE-2026-105133 and CVE-2026-105134) to perform unauthenticated remote code execution. They chained these flaws to bypass authentication and execute code with SYSTEM privileges. Post-exploitation, attackers deployed JSP webshells, installed XMRig cryptocurrency miners disguised as Microsoft Edge processes, and used an AI-assisted PowerShell script to hide mining activity by terminating Task Manager. Persistence was maintained via a fake Windows service named MicrosoftEdgeUpdateSvc. Additionally, a vulnerable kernel driver (WinRing0x64.sys) was exploited for kernel-level hardware access to optimize mining. All AhsayCBS versions through 10.3.4 are affected, with managed service providers primarily targeted.

AhsayCBS backup utility versions up to 10.3.4 contain a vulnerability (CVE-2026-105133) that allows unauthenticated remote code execution. Exploitation involves chaining two critical vulnerabilities to bypass authentication and execute code with SYSTEM privileges. Attackers have deployed webshells, cryptocurrency miners disguised as legitimate processes, and persistence mechanisms including fake Windows services and kernel driver exploitation. Managed service providers are primarily targeted.