Microsoft’s September Patch Tuesday covered 80 CVEs, 17 of which were rated critical, and included patches for Azure DevOps Server, Chakra Scripting engine, and Microsoft SharePoint. Sixty-two were labeled as important and included patches for Microsoft Excel, Microsoft Edge, and Microsoft Exchange. Only one was rated as moderate.
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This new iteration of Purple Fox that we came across, also being delivered by Rig, has a few new tricks up its sleeve. It retains its rootkit component by abusing publicly available code. It now also eschews its use of NSIS in favor of abusing PowerShell, making Purple Fox capable of fileless infection. It also incorporated additional exploits to its infection chain, most likely as a foolproof mechanism to ensure that it can still infect the system. Purple Fox is a downloader malware; besides retrieving and executing cryptocurrency-mining threats, it can also deliver other kinds of malware.
Read MoreAfter looking into the recent variant of the Glupteba dropper delivered from a malvertising attack, we found that the dropper downloaded two undocumented components aside from the Glupteba malware—a browser stealer and a router exploiter. Another notable feature is that the malware can now also update its command and control server address using data from bitcoin transactions.
Read More While none of the vulnerabilities were listed as under active attack at the time of August Patch Tuesday release, a few of the bugs addressed this month fall under the “wormable” category, namely remote code execution (RCE) vulnerabilities in the Remote Desktop Services. This month’s Patch Tuesday also disables the scripting language VBScript by default on Internet Explorer on Windows 7, 8, and 8.1.
Read More Critical patches covered in the release include fixes for Windows DHCP Server, Azure DevOps Server and Team Foundation Server, and .NET Framework, namely assigned as CVE-2019-0785, CVE-2019-1072, and CVE-2019-1113. Elevation of privilege vulnerabilities in Microsoft splwow64 (CVE-2019-0880) and Win32k (CVE-2019-1132), which were reported as being exploited, have also been patched.
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