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Microsoft Security Intelligence
7 entries found.
Updated on Nov 10, 2010

Windows Defender detects and removes this threat.

Win32/FakeSysdef is a family of programs that claim to scan for hardware defects related to system memory, hard drives and over-all system performance. They scan the system, show fake hardware problems, and offer a solution to defrag the hard drives and optimize the system performance. They then inform the user that they need to pay money to download the fix module and to register the software in order to repair these non-existent hardware problems. One of the first variants was distributed as program named "HDD Defragmenter" hence the name "FakeSysdef" or "Fake System Defragmenter".

NOTE: On March 31, 2017, an incorrect detection for our cloud-based protection for Trojan:Win32/FakeSysdef was identified and immediately fixed.

To ensure that this issue is remediated, you can do a forced daily update to download your Microsoft antimalware and antispyware software. The fix has been deployed in signature build 1.239.530.0 on March 31, 2017, 2:50 PM PDT.

See Updating your Microsoft antimalware and antispyware software for more information.

 

Alert level: severe
Updated on Aug 04, 2011
Alert level: severe
Updated on Nov 09, 2010
Alert level: severe
Updated on Mar 07, 2015
Alert level: severe
Updated on Mar 15, 2022
Alert level: severe
Updated on Apr 25, 2012
Alert level: severe
Updated on Apr 20, 2022
Alert level: severe