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It never ends


MICROSOFT SAYS WINDOWS UNDER ATTACK FROM CHINESE THREAT ACTORS USING STEALTH
MALWARE

Microsoft wants you to stay ahead of the curve when it comes to Hafnium's
activities.
Robert Carnevale
12 Apr 2022 3

Source: Daniel Rubino / Windows Central




WHAT YOU NEED TO KNOW

 * China-based state-sponsored threat actor group Hafnium is stirring the pot
   once again.
 * You may remember Hafnium from the Microsoft Exchange server drama of early
   2021.
 * Now, Hafnium is utilizing malware to evade Windows defenses and ensure
   compromised environments remain vulnerable.

Microsoft is once again sounding the alarm so that you, the user, stay informed
about the latest malware campaigns and cyber threats. This time, the alert is
for Tarrask, a "defense evasion malware" that uses Windows Task Scheduler to
hide a device's compromised status from itself.

The attack comes from Hafnium, the state-sponsored, China-based group that you
may recall to be a big deal because of its involvement in the Microsoft Exchange
meltdown of 2021. The data gathered during that ordeal has been speculated to be
fuel for AI innovations by the Chinese government.

Microsoft is currently tracking Hafnium's activity when it comes to novel
exploits of the Windows subsystem. Hafnium is using Tarrask malware to ensure
that compromised PCs remain vulnerable, employing a Windows Task Scheduler bug
to clean up trails and make sure that on-disk artifacts of Tarrask's activities
don't stick around to reveal what's going on.



This is Tarrask hiding its tracks.Source: Microsoft

Microsoft has high-level recommendations for how to combat Tarrask, which you
can check out at the company's blog post on the subject (via BleepingComputer).
Cyber resistance guidance in this case includes modifying audit policies,
checking for scheduled tasks without SD (security descriptor) values, and more.

If you find these sorts of Microsoft PSAs to be useful, be sure to check out the
company's security summit on May 12, wherein it will explore the latest
cybersecurity threats in-depth and give you a chance to ask Redmond's in-house
experts questions live.

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