New Office 0day (CVE-2017-11826) Exploited in the Wild
On September 28, 2017, Qihoo 360 Core Security (@360CoreSec) detected an in-the-wild attack that leveraged CVE-2017-11826, an office 0day vulnerability. This vulnerability exists in all the supported office versions. The attack only targeted limited customers. The attacker embedded malicious .docx in the RTF files. Through reversing analysis of the sample C&C, we found that the attack was initiated in August and the launch date of the attack can be dated back to September. It was in this time window that the vulnerability has been exploited as a 0day. Qihoo 360 Core Security has been the first security vendor to share the details of the vulnerability and coordinated with Microsoft to disclose the news, as well as a timely patch to resolve the Office 0day vulnerability within a week. The latest versions of 360 security products could detect and prevent exploitation of this vulnerability and are available for download. In the meanwhile, we also highly suggest users to update Microsoft Patch in time.