We discovered a malware that uses three different online services — including Slack and GitHub– as part of its routine. Analysis of the attacker’s tools, techniques, and procedures lead us to believe that this might be a targeted attack from very capable threat actors.
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In early April of this year a zero-day exploit (designated as CVE-2016-1019) was found in Adobe Flash Player. This particular flaw was soon used by the Magnitude Exploit Kit, which led to an Adobe out-of-cycle patch. This flaw was being used to lead to drive-by download attacks with Locky ransomware as the payload.
However, this did not end the threat for users. We recently saw a new variant of this attack that added an unusual twist. On top of the Flash exploit, an old escalation of privileges exploit in Windows (CVE-2015-1701) was used to bypass sandbox technologies.
Read MoreOur analysis of the win32k.sys vulnerability used in a recent targeted attack reveals that it opens up an easy way to bypass the sandbox, making it a bigger threat than originally thought. As mentioned in Microsoft security bulletin MS15-051, CVE-2015-1701 is an elevation of privilege vulnerability that exists when the Win32k.sys kernel-mode driver improperly handles…
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