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Trojan:Win32/Kovter is a well-known click-fraud malware which is challenging to detect and remove because of its file-less persistence on infected PCs. In this blog, we will share some technical details about the latest changes we have seen in Kovter’s persistence method and some updates on their latest malvertising campaigns. New persistence method Since June 2016,…
Read MoreThe latest Nemucod campaign shows the malware distributing a spam email attachment with a .wsf extension, specifically ..wsf (with a double dot) extension. It is a variation of what has been observed since last year (2015) – the TrojanDownloader:JS/Nemucod malware downloader using JScript. It still spreads through spam email attachment, typically inside a .zip file,…
Read MoreAs part of our ongoing effort to provide better malware protection, the August 2016 release of the Microsoft Malicious Software Removal Tool (MSRT) includes detections for BrowserModifier: Win32/Neobar, unwanted software, and Win32/Rovnix, a trojan malware family. This blog discusses BrowserModifier:Win32/Neobar and its inclusion in MSRT supports our unwanted software family detections in Windows Defender, along…
Read MoreThe DUBNIUM campaign in December involved one exploit in-the-wild that affected Adobe Flash Player. In this blog, we’re going to examine the technical details of the exploit that targeted vulnerability CVE-2015-8651. For more details on this vulnerability, see Adobe Security Bulletin APSB16-01. Note that Microsoft Edge on Windows 10 was protected from this attack due…
Read MoreAs part of our ongoing effort to provide better malware protection, the July 2016 release of the Microsoft Malicious Software Removal Tool (MSRT) includes detection for Win32/Cerber, a prevalent ransomware family. The inclusion in MSRT complements our Cerber-specific family detections in Windows Defender, and our ransomware-dedicated cloud protection features. We started seeing Cerber in February…
Read MoreWe at the MMPC are constantly tracking new and emerging ransomware threats so we can be one step ahead of active campaigns and help protect our users. As part of these efforts, we recently came across a new variant of the Win32/Troldesh ransomware family. Ransomware, like most malware, is constantly trying to change itself in…
Read MoreRecently, we blogged about the basic functionality and features of the DUBNIUM advanced persistent threat (APT) activity group Stage 1 binary and Adobe Flash exploit used during the December 2015 incident (Part 1, Part 2). In this blog, we will go through the overall infection chain structure and the Stage 2 executable details. Stage 2 executables…
Read MoreWe are alerting Windows users of a new type of ransomware that exhibits worm-like behavior. This ransom leverages removable and network drives to propagate itself and affect more users. We detect this ransomware as Ransom:Win32/ZCryptor.A. Infection vector Ransom:Win32/ZCryptor.A is distributed through the spam email infection vector. It also gets installed in your machine through…
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