Change log for version 1.253.857.0 RSS feed icon

This page shows you what's changed in the most recent definitions update for Microsoft antimalware and antispyware software.

The latest update is:

  • 1.253.857.0

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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: Oct 17,2017 09:18 AM UTC

New definitions


No new threats have been identified in this definition update.

Updated definitions

Adware:Win32/Pirrithigh
BrowserModifier:Win32/Obrypserhigh
BrowserModifier:Win32/Shopperzhigh
SoftwareBundler:MSIL/Wizremhigh
SoftwareBundler:Win32/Dlhelperhigh
SoftwareBundler:Win32/FileTourhigh
SoftwareBundler:Win32/Mizenotahigh
SoftwareBundler:Win32/Prepscramhigh
SoftwareBundler:Win32/Techsnabhigh
Trojan:Win32/Startpagehigh
TrojanDownloader:Win32/Adloadhigh
TrojanDownloader:Win32/Delfhigh
Backdoor:Win32/Cycbot.Bsevere
Backdoor:Win32/Darkmoon.AEsevere
Backdoor:Win32/Delfsevere
Backdoor:Win32/IRCbotsevere
Backdoor:Win32/Kelihossevere
Backdoor:Win32/Kelihos.Fsevere
Backdoor:Win32/Nuclearsevere
Backdoor:Win32/Proratsevere
Backdoor:Win32/Rbotsevere
Backdoor:Win32/Sdbotsevere
PWS:Win32/Fareitsevere
PWS:Win32/Ldpinchsevere
PWS:Win32/Ldpinch!rfnsevere
Rogue:Win32/FakeVimessevere
Rogue:Win32/Vakcunesevere
Rogue:Win32/Winwebsecsevere
Trojan:Win32/Alureonsevere
Trojan:Win32/Alureon!infsevere
Trojan:Win32/Conhook.Dsevere
Trojan:Win32/FakeSysdefsevere
Trojan:Win32/Killavsevere
Trojan:Win32/Matcashsevere
Trojan:Win32/Sirefef.ABsevere
Trojan:Win32/Sirefef.BCsevere
Trojan:Win32/Sirefef.Vsevere
Trojan:Win32/Smallsevere
Trojan:Win32/VBsevere
Trojan:WinNT/Alureon.Hsevere
Trojan:WinNT/Alureon.Lsevere
TrojanDownloader:Win32/Agentsevere
TrojanDownloader:Win32/Dofoil!rfnsevere
TrojanDownloader:Win32/Dofoil.AAsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/Dofoil.Tsevere
TrojanDownloader:Win32/Harnigsevere
TrojanDownloader:Win32/Harnig.Ssevere
TrojanDownloader:Win32/Karagany.Isevere
TrojanDownloader:Win32/Renossevere
TrojanDownloader:Win32/Smallsevere
TrojanDownloader:Win32/Unruy.Hsevere
TrojanDownloader:Win32/Waledac.ALsevere
TrojanDownloader:Win32/Zlobsevere
TrojanDropper:Win32/Sirefefsevere
TrojanDropper:Win32/Sirefef.Bsevere
TrojanSpy:Win32/Bankersevere
Worm:Win32/Dorkbotsevere
Worm:Win32/Dorkbot.Isevere
Worm:Win32/Hamweqsevere
Worm:Win32/Phorpiex.Bsevere
Worm:Win32/Pushbotsevere