AVAST Software s.r.o. - 0.035% Detection Rate *

Did you just run into a file that has a digital signature from AVAST Software s.r.o.? If that's the case, please read on.

You will probably see AVAST Software s.r.o. when double-clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

Screenshot where AVAST Software s.r.o. appears as the verified publisher in the UAC dialog

You can also view the AVAST Software s.r.o. certificate with the following procedure:

  1. Open up Windows Explorer and locate the AVAST Software s.r.o. file
  2. Right-click on the file and select Properties
  3. Click on the Digital Signatures tab
  4. Click the View Certificate button

Here's a screencap of a file that has been signed by AVAST Software s.r.o.:

Screenshot of the AVAST Software s.r.o. certificate

As you can see in the screenshot above, the Windows OS states that "This digital signature is OK". This implies that the file has been published by AVAST Software s.r.o. and that the file has not been tampered with.

If you click the View Certificate button shown in the screenshot above, you can examine all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also view the address for AVAST Software s.r.o., such as the street name, city and country.

DigiCert High Assurance Code Signing CA-1 and DigiCert SHA2 Assured ID Code Signing CA has issued the AVAST Software s.r.o. certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.

AVAST Software s.r.o. Files

These are the AVAST Software s.r.o. files I've collected, thanks to the FreeFixer users.

The FreeFixer tool treats files from AVAST Software s.r.o. as trusted, which means that the AVAST Software s.r.o. files will appear with a green background and that there's no removal checkbox for the file. However, as you can see in the scan results below, a few of the anti-virus scanners detects the AVAST Software s.r.o. file(s). My guess is that those detections are false positives and that the files are safe. It's unlikely that AVAST Software s.r.o. would ship a malware file.

Detection RatioFile Name
1/59AvEmUpdate.exe
1/61AvEmUpdate.exe
1/61AvEmUpdate.exe
1/61AvEmUpdate.exe
1/64AvEmUpdate.exe
1/65AvLaunch.exe
1/70aswBoot.exe
1/59aswCleanerDLL.dll
1/68CCUpdate.exe
1/71AvastBrowser.exe
2/61aswOfferTool.exe
1/60AvEmUpdate.exe
1/64aswHdsKe.sys
1/64AavmRpch.dll
1/65Sf2.dll
1/64vaarclient.dll
1/69TuneupUI.exe
1/70avast_free_antivirus_setup_online.exe
0/57asw5B9E.tmp
0/59AvLaunch.exe
0/66overseer.exe
0/59aswhooka.dll
0/57aswsp.sys
0/56SZBrowser.exe
0/56aswbidsha.sys
0/57aswWebRepIE.dll
0/57aswhookx.dll
0/57aswWebRepIE64.dll

Scanner and Detection Names

Here is the detection names for the AVAST Software s.r.o. files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.

As mentioned above, I think these detections are incorrect since it is very unlikely that AVAST Software s.r.o. would ship a malware file.

ScannerDetection Names
APEXMalicious
Antiy-AVLTrojan/Win32.Shelma
BaiduWin32.Trojan.WisdomEyes.16070401.9500.9514
CrowdStrikewin/malicious_confidence_60% (D), win/malicious_confidence_80% (D)
CylanceUnsafe
JiangminTrojan.CHS.g
MAXmalware (ai score=18)
RisingPUA.Google!8.387 (cloud:ZbPg7m6MRPO) , HiddenF.Malware.Generic(Thunder)!1.A1C4 (tfe:2:AGFau7v89VJ)
TrendMicro-HouseCallSuspicious_GEN.F47V0715
VBA32BScope.Trojan-Dropper.Injector

* How the Detection Percentage is Calculated

The detection percentage is based on the fact that I have collected 53753 scan reports for the AVAST Software s.r.o. files. 19 of these scan results came up with some sort of detection. You can review the full details of the scan reports by examining the files listed above.

Analysis Details

In the analysis on this page I grouped all certificates where the signer name is set to upper and lower case variants of AVAST Software s.r.o.. These are the signer names:

The analysis is done on certificates with the following serial numbers:

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