Categories: PUA

PUP.Optional.Yontoo malicious file

The PUP.Optional.Yontoo is considered dangerous by lots of security experts. When this infection is active, you may notice unwanted processes in Task Manager list. In this case, it is adviced to scan your computer with GridinSoft Anti-Malware.

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What PUP.Optional.Yontoo virus can do?

  • Executable code extraction
  • Attempts to connect to a dead IP:Port (1 unique times)
  • Presents an Authenticode digital signature
  • Creates RWX memory
  • At least one IP Address, Domain, or File Name was found in a crypto call
  • Drops a binary and executes it
  • HTTP traffic contains suspicious features which may be indicative of malware related traffic
  • Performs some HTTP requests
  • Creates a copy of itself

Related domains:

z.whorecord.xyz
s2.symcb.com
sv.symcd.com
a.tomx.xyz
install.sizlsearch.net

How to determine PUP.Optional.Yontoo?


File Info:

crc32: BA660189md5: e4802961f4d1d6e23f33cc18821db07bname: sizlsearchUninstaller.exesha1: 2802629a2fc0c68550ececdb2f06d2d4cec0ff6csha256: d93203136b520a5193e2933902eb34fc8e5b4b9c384f9c855d4da9b2320c6815sha512: f937e4df502178071f5983358400d6181b20cafbd991fe8d5148b3856aadd083e01b60c7cecf7064ecf7a0e6be9e34325e95fe75705771bb80b2b0c30cc8c446ssdeep: 12288:ccYJbZlJWwVkSyN8h5EdSFiZDbH0Zo//o1Qr5nHDc:jSYEFiZHU7Qr5nHDctype: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

Translation: 0x0000 0x04b0LegalCopyright: Assembly Version: 1.0.0.0InternalName: sizlsearch Uninstaller.exeFileVersion: 1.0.0.0ProductVersion: 1.0.0.0FileDescription: OriginalFilename: sizlsearch Uninstaller.exe

PUP.Optional.Yontoo also known as:

Bkav W32.HfsAdware.AB30
MicroWorld-eScan Gen:Variant.Adware.MSILPerseus.1523
CAT-QuickHeal PUA.Intactgate.Gen
ALYac Gen:Variant.Adware.MSILPerseus.1523
VIPRE Trojan.Win32.Generic!BT
K7GW Adware ( 004b88201 )
K7AntiVirus Adware ( 004b88201 )
Invincea heuristic
Baidu Win32.Adware.BrowseFox.s
NANO-Antivirus Riskware.Win32.Yontoo.enxuau
Cyren W32/S-5b40d0e8!Eldorado
Symantec ML.Attribute.HighConfidence
TrendMicro-HouseCall TROJ_GEN.R002H0CEK18
Avast MSIL:BrowseFox-FR [Adw]
Kaspersky not-a-virus:HEUR:AdWare.MSIL.BrowseFox.gen
BitDefender Gen:Variant.Adware.MSILPerseus.1523
Ad-Aware Gen:Variant.Adware.MSILPerseus.1523
Sophos Browse Fox (PUA)
F-Secure Gen:Variant.Adware.MSILPerseus
DrWeb Trojan.Yontoo.4052
Zillya Adware.BrowseFoxCRTD.Win32.4151
McAfee-GW-Edition Artemis!PUP
Emsisoft Application.BrowserExt (A)
SentinelOne static engine – malicious
F-Prot W32/S-5b40d0e8!Eldorado
Webroot Pua.Lucky.Leap
Avira ADWARE/BrowseFox.Gen7
Fortinet Adware/BrowseFox
Antiy-AVL GrayWare[AdWare]/Win32.AGeneric
Endgame malicious (high confidence)
Arcabit Trojan.Adware.MSILPerseus.D5F3
SUPERAntiSpyware PUP.SizlSearch/Variant
ZoneAlarm not-a-virus:HEUR:AdWare.MSIL.BrowseFox.gen
Microsoft BrowserModifier:Win32/Foxiebro
AhnLab-V3 PUP/Win32.BrowseFox.R152414
McAfee Artemis!E4802961F4D1
AVware Trojan.Win32.Generic!BT
MAX malware (ai score=100)
Malwarebytes PUP.Optional.Yontoo
ESET-NOD32 a variant of MSIL/BrowseFox.O potentially unwanted
Tencent Win32.Risk.Adware.Ajuu
Yandex Riskware.Agent!
Ikarus PUA.Multiplug
GData Gen:Variant.Adware.MSILPerseus.1523
AVG MSIL:BrowseFox-FR [Adw]
Qihoo-360 Win32/Virus.Adware.708

How to remove PUP.Optional.Yontoo?

  • Download and install GridinSoft Anti-Malware.
  • Open GridinSoft Anti-Malware and perform a “Standard scan“.
  • Move to quarantine” all items.
  • Open “Tools” tab – Press “Reset Browser Settings“.
  • Select proper browser and options – Click “Reset”.
  • Restart your computer.
Paul Valéry

I'm a cyber security analyst and data science expert with 5+ years of experience with security software contractors.

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