Microsoft first received information about this vulnerability through coordinated vulnerability disclosure. Zero-day was initially found and reported to McAfee by James Forshaw of Google Project Zero.
The vulnerability is publicly known as "Sandworm" and has been exploited by the Chinese against Taiwan.
Vulnerable component: Windows
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to an error when handling malicious Office files. A remote attacker can create a specially crafted Microsoft Office file containing the malicious OLE object, trick the victim into opening it and execute arbitrary code with privileges of the current user.
Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.
Known APT campaigns:
BlackTech group is a cyber espionage group mainly targeting companies in East Asia, particularly Taiwan, and occasionally, Japan and Hong Kong.
The threat group is linked to PLEAD in 2012, Shrouded Crossbow in 2010, and Waterbear cyber operations. To perform attacks BlackTech used a novel right-to-left override (RTLO) technique.
- Microsoft Windows - OLE Package Manager SandWorm Exploit [Exploit-DB]