Change log for definition version 1.283.607.0 RSS feed icon

This page lists what has changed in the most recent definitions update for Windows Defender Antivirus and Microsoft Security Essentials.

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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:

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Definition available date: Dec 14,2018 06:57 PM UTC

New definitions
Exploit:O97M/CVE-2012-11882severe
Trojan:O97M/Dornoe.E!amssevere
Trojan:O97M/Dornoe.F!amssevere
Trojan:O97M/Dornoe.G!amssevere
Trojan:O97M/Obfuse.CCsevere
Trojan:Win32/Kryptsevere
TrojanDownloader:BAT/Elshutilosevere
TrojanDownloader:O97M/Aptshot.Asevere

Updated definitions
Exploit:O97M/CVE-2012-0158severe
MonitoringTool:AndroidOS/AndroRatsevere
Ransom:Win32/Gandcrabsevere
Trojan:O97M/Donoffsevere
Trojan:O97M/Obfuse.CBsevere
Trojan:O97M/Phishsevere
Trojan:PDF/Phishsevere
Trojan:Win32/BITSAbuse.Bsevere
Trojan:Win32/CryptInjectsevere
Trojan:Win32/Injectorsevere
Trojan:Win32/Skeeyah.A!bitsevere
TrojanDownloader:JS/Nemucodsevere
TrojanDownloader:O97M/Donoffsevere