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Change log for definition version 1.287.616.0 
This page lists what has changed in the most recent definitions update for Windows Defender Antivirus and Microsoft Security Essentials.
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Select change log
The following tables list the new and updated definitions for the version you select here. You can choose from the 20 latest updates, and the most recent update is shown by default:
Definition available date: Feb 23,2019 03:57 PM UTC
New definitions
Updated definitions
| Adware:Win32/Filetour | high |
| BrowserModifier:Win32/Foxiebro | high |
| HackTool:PowerShell/PsAttack.B | high |
| Backdoor:MSIL/Bladabindi!rfn | severe |
| Backdoor:MSIL/Bladabindi.BN | severe |
| Backdoor:PHP/WebShell | severe |
| Exploit:O97M/CVE-2017-11882.F | severe |
| Exploit:O97M/CVE-2017-11882.L | severe |
| Exploit:O97M/CVE-2017-8570.B | severe |
| PWS:Win32/Primarypass.A | severe |
| Trojan:O97M/Obfuse.H | severe |
| Trojan:PDF/Phish | severe |
| Trojan:Win32/Bluteal!rfn | severe |
| Trojan:Win32/Casdet!rfn | severe |
| Trojan:Win32/CryptInject | severe |
| Trojan:Win32/Crysteb!rfn | severe |
| Trojan:Win32/Dynamer!rfn | severe |
| Trojan:Win32/Emotet.AC!bit | severe |
| Trojan:Win32/Kryptomix | severe |
| Trojan:Win32/Occamy.A | severe |
| Trojan:Win32/Occamy.C | severe |
| Trojan:Win32/Skeeyah.A!rfn | severe |
| Trojan:Win32/Skeeyah.B!rfn | severe |
| Trojan:Win32/Suloc.A | severe |
| Trojan:Win32/Tiggre!rfn | severe |
| TrojanDownloader:O97M/Donoff | severe |
| TrojanDownloader:O97M/Obfuse!rfn | severe |
| TrojanSpy:Win32/SocStealer!rfn | severe |
