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Understanding the true size of “Fireball”

Keeping tabs on the movement of cybersecurity threats, understanding the size and scope of attacks, and disrupting cybercriminal campaigns through next-gen technologies are fundamental parts of our day-to-day work at Microsoft Windows Defender Research. So when recent reports of the ... continue reading

MSRT June 2017: Removing sneaky Xiazai

In the June release of the Microsoft Malicious Software Removal Tool (MSRT), we’re adding Xiazai, a widespread family of browser modifiers that we have blocked and removed from millions of computers since 2015. Xiazai is a software bundler that can ... continue reading

MSRT February 2017: Chuckenit detection completes MSRT solution for one malware suite

In September 2016, we started adding to Microsoft Malicious Software Removal Tool (MSRT) a malware suite of browser modifiers and other Trojans installed by software bundlers. We documented how the malware in this group install other malware or applications silently, ... continue reading

MSRT December 2016 addresses Clodaconas, which serves unsolicited ads through DNS hijacking

In this month’s Microsoft Malicious Software Removal Tool (MSRT) release, we continue taking down unwanted software, the pesky threats that force onto our computers things that we neither want nor need. BrowserModifier:Win32/Clodaconas, for instance, displays ads when you’re browsing the ... continue reading

MSRT November 2016: Unwanted software has nowhere to hide in this month’s release

We came across a browser modifier that sports rootkit capabilities. Not only does the threat, detected as BrowserModifier:Win32/Soctuseer, cross the line that separates legitimate software from unwanted, it also takes staying under the radar to the next level. Rootkit capabilities, ... continue reading

MSRT November 2016: Unwanted software has nowhere to hide in this month’s release

We came across a browser modifier that sports rootkit capabilities. Not only does the threat, detected as BrowserModifier:Win32/Soctuseer, cross the line that separates legitimate software from unwanted, it also takes staying under the radar to the next level. Rootkit capabilities, ... continue reading

MSRT October 2016 release: Adding more unwanted software detections

Unwanted software often piggy-backs on program downloads, delivered by software bundlers. These bundles, which you might have downloaded, can include software that you do not want, and some that are harmful. The bundled or “extra” software can perform actions on ... continue reading

MSRT September 2016 release feature: Prifou

As part of our ongoing effort to provide better malware protection, the Microsoft Malicious Software Removal Tool (MSRT) release this September includes detections for: BrowserModifier:Win32/Prifou TrojanClicker:Win32/NightClick Trojan:Win32/Suweezy Trojan:Win32/Xadupi This blog discusses BrowserModifier:Win32/Prifou (Prifou). Windows Defender detects this threat because it ... continue reading