AVAST Software a.s. - 0.054% Detection Rate *

Did you just stumble upon a download or a file on your computer that has a digital signature from AVAST Software a.s.? If so, please read on.

You'll typically notice AVAST Software a.s. when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

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

You can view the additional details from the AVAST Software a.s. digital signature with the following procedure:

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

Here is a screencap of a file that has been digitally signed by AVAST Software a.s.:

Screenshot of the AVAST Software a.s. certificate

As you can see in the screenshot above, the Windows OS states that "This digital signature is OK". This means that the file has been published by AVAST Software a.s. 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 examine the address for AVAST Software a.s., such as the street name, city and country.

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

AVAST Software a.s. Files

These are the AVAST Software a.s. files I have gathered, thanks to the FreeFixer users.

The FreeFixer tool treats files from AVAST Software a.s. as safe, which means that the AVAST Software a.s. 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 a.s. file(s). My guess is that those detections are incorrect and that the files are safe. It is unlikely that AVAST Software a.s. would ship a malware file.

Detection RatioFile Name
1/57AvastEmUpdate.exe
1/54aswBoot.exe
1/46AvastBCL-Sfx.exe
1/54aswHds.dll
2/54Sf.bin
1/56AvastEmUpdate.exe
1/55aswsnx.sys
1/57aswsnx.sys
1/54AvastEmUpdate.exe
1/55backup.exe
1/54AvastEmUpdate.exe
1/55aswsp.sys
1/56aswsnx.sys
1/54aswsp.sys
1/47Sf.bin
1/49aswAux.dll
1/55aswsp.sys
1/54aswsp.sys
1/57aswHds.dll
1/56aswsp.sys
1/57aswsp.sys
1/57PushPin.dll
1/55aswAR.dll
0/47instup.exe
0/50aswWebRepIE64.dll
0/49aswmonfl%USERNAME%.sys
0/51ngtool.exe
0/49aswWebRepIE.dll
0/47aswkbd.sys
0/53aswWebRepIE.dll
0/55vboxaswdrv.sys
0/57aswWebRepIE64.dll
0/54aswWebRepIE64.dll

Scanner and Detection Names

Here is the detection names for the AVAST Software a.s. 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 a.s. would ship a malware file.

ScannerDetection Names
AegisLabDeepscan.Generic.Malware!c
Antiy-AVLTrojan/Win32.SGeneric, Trojan[Backdoor:HEUR]/Win64.AGeneric
BkavW32.MegaSearchZ.Adware, W32.eHeur.Downloader
ByteHeroTrojan.Win32.Heur.098, Trojan.Win32.Native.Heur.Gen
EmsisoftGen:Trojan.Heur.GM.0004048024 (B)
MicroWorld-eScanGen:Trojan.Heur.ru2@YkigLEmG
RisingPE:PUF.Clicker.Pimpo!1.9C67, PE:Malware.RDM.38!5.2C[F1]
VBA32Malware-Cryptor.Win32.General.4

* How the Detection Percentage is Calculated

The detection percentage is based on that I have collected 44282 scan results for the AVAST Software a.s. files. 24 of these scan reports came up with some sort of detection. You can view the full details of the scan reports by examining the files listed above.

Analysis Details

The analysis has been done on certificates with the following serial numbers:

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