Yontoo LLC - 18% Detection Rate *

Did you just find a download or a file on your computer that has been digitally signed by Yontoo LLC? Some of the security products refers to the detected files as Yontoo (v) and Yontoo. The detection rate for the Yontoo LLC files collected here is 18%. Please read on for more details.

You will typically notice Yontoo LLC when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screengrab shows:

Screenshot where Yontoo LLC appears as the verified publisher in the UAC dialog

You can view additional details from the Yontoo LLC certificate with the following procedure:

  1. Open up Windows Explorer and locate the Yontoo LLC file
  2. Right-click the file and select Properties
  3. Click the Digital Signatures tab
  4. Click the View Certificate button

Here's a screencap of a file that has been digitally signed by Yontoo LLC:

Screenshot of the Yontoo LLC certificate

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This implies that the file has been published by Yontoo LLC and that no one has tampered with the file.

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 Yontoo LLC, such as the street name, city and country.

VeriSign Class 3 Code Signing 2010 CA and Go Daddy Secure Certification Authority has issued the Yontoo LLC certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.

Yontoo LLC Files

These are the Yontoo LLC files I have collected, thanks to the FreeFixer users.

Detection RatioFile Name
1/46YontooDesktop.exe
12/48YontooSetup-Silent.exe
9/47YontooDesktop.exe
15/49YontooIEClient.dll
9/50YontooIEClient_2.dll
13/49YontooIEClient.dll
13/47YontooIEClient.dll
8/48YontooIEClient.dll
16/48YontooIEClient.dll
6/46YontooIEClient_2.dll
2/48YontooIEClient.dll
7/48YontooDesktop.exe
4/47Desktop.OS.Plugin.dll
11/47YontooIEClient.dll
15/47YontooIEClient.dll
7/47yontoosetup[1].exe
2/48YontooIEClient.dll
8/47YontooIEClient.dll
14/48YontooIEClient.dll
14/45YontooIEClient.dll
11/47YontooIEClient.dll
3/46YontooIEClient.dll

Scanner and Detection Names

Here is the detection names for the Yontoo LLC files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.

ScannerDetection Names
AVGAdInject.Yontoo
AgnitumAdware.Yontoo!wyndF87Yrz8, Adware.WebCake!, Riskware.Adware!ARfgLWXzRnM, Adware.Yontoo!Hqk5cYxsnSA
AntiVirADWARE/Yontoo.Gen
Antiy-AVLAdWare/Win32.Yontoo.gen, WebToolbar/Win32.Dsearch, AdWare/Win32.WebCake, AdWare/Win32.WebCake.gen
Baidu-InternationalAdware.Win32.Yontoo.gen, Adware.Win32.Yontoo.A, AdWare.Win32.Yontoo.AQg, AdWare.Win32.Yontoo.aPYl, AdWare.Win32.Yontoo.au, Malware.Win32.Yontoo.40, AdWare.Win32.Yontoo.ASQN, Adware.Win32.Yontoo.45, Trojan.Adware.Win32.Yontoo.A, AdWare.Win32.Yontoo.azkW, AdWare.Win32.Yontoo.AV, Adware.Win32.WebCake.Afq
CMCAdWare.Win32.WebCake!O
ClamAVWin.Adware.Yontoo-4
ComodoHeur.Suspicious, Application.Win32.Yontoo.a, UnclassifiedMalware
DrWebAdware.Plugin.8, Adware.Plugin.11, Adware.Siggen.24249
ESET-NOD32a variant of Win32/Adware.Yontoo.B, a variant of MSIL/WebCake.B, a variant of Win32/Adware.Yontoo.A
EmsisoftAdware.Win32.Yontoo.AMN (A)
F-ProtW32/ApplCtnX.Z, W32/Adware.AKRZ
FortinetAdware/Yontoo
IkarusAdWare.Yontoo, not-a-virus:AdWare.Win32.WebCake, AdWare.WebCake
K7AntiVirusAdware, Unwanted-Program ( 00454f261 ), Trojan
K7GWUnwanted-Program ( 00454f261 ), Trojan
Kasperskynot-a-virus:AdWare.Win32.WebCake.a
KingsoftWin32.Troj.Undef.(kcloud), Win32.Troj.Dsearch.f.(kcloud), Win32.Troj.WebCake.a.(kcloud), Win32.Troj.Generic.al.(kcloud)
MalwarebytesAdware.Yontoo
NANO-AntivirusTrojan.Win32.Siggen.cocwct
PCToolsSecurityRisk.Yontoo!rem
Qihoo-360Win32/Trojan.845
RisingTrojan.Win32.Generic.1400B959
SUPERAntiSpywareTrojan.Agent/Gen, Adware.Yontoo
SymantecYontoo
TheHackerTrojan/Adware.Yontoo.a
TrendMicroADW_YONTOO, BKDR_BIFROSE.BMC
TrendMicro-HouseCallADW_YONTOO, TROJ_GEN.RFFFH05K613, BKDR_BIFROSE.BMC
VBA32AdWare.WebCake
VIPREYontoo (v)
ViRobotAdware.Dsearch.42784

* How the Detection Percentage is Calculated

The detection percentage is based on the fact that I've gathered 2084 scan results for the Yontoo LLC files. 383 of these scan reports came up with some sort of detection. You can view the full details of the scan results by examining the files listed above.

Analysis Details

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

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