Yontoo Layers

There have been many reports of computer systems showing constant advertisements due to a Yontoo adware infection. Although these kinds of applications are often installed with the full knowledge that they will display advertisements, ESG security analysts have also received reports of severe virus and Trojan infections contracted from advertisements that Yontoo displays. Basically, the Yontoo application will be installed as part of a requirement for installing an application known as PageRage, designed to overlay designs on top of Facebook's profile pages, in essence allowing computer users to customize and make more attractive their Facebook wall, profile and Timeline.

PageRage's manufacturers claim that Yontoo is a legitimate way of supporting their software, although it is up to computer users to decide whether the advertisements that Yontoo delivers to the computer system are worth being able to tweak the appearance of a Facebook profile. There are several reasons why Yontoo is a form of adware, although this kind of infection may be worth the risk for some computer users. The main issue of installing Yontoo on your computer is the fact that advertisements that Yontoo displays may lead to undesirable sites. Yontoo also has some behaviors that are not compatible with good applications acting in good faith. For example, Yontoo Adware has several tracking and data-recollection components that are embedded and may be difficult to disable, as well as the fact that Yontoo is not entirely honest about what Yontoo does when installed on the computer user's system. While Yontoo Layers is limited to your web browser and can be easily quarantined by most security applications, some of the advertisements that Yontoo displays contain questionable content.

SpyHunter Detects & Remove Yontoo Layers

Analysis Report

General information

Family Name:	Yontoo Layers
Signature status:	No Signature

Known Samples

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Known Samples

This section lists other file samples believed to be associated with this family.

MD5: 87bc5a7b14f0436bb116d5a009f383d1 SHA1: 47e8debf5f501005bfef070b2ceefa73751eebf0 SHA256: 2ADE387BAA8504CBDB323C5D866E7E8F68971B57B205AE824E04B5AEDC8AE51E File Size: 444.93 KB, 444928 bytes

MD5: f28bb19bc5427697320c63e15e257395 SHA1: 0ca964209f8e51995111386779861dbb9291835c SHA256: D68844A496C93F4D061E0B403803FD03A2556129D4E0ED972F3184C11983D1E1 File Size: 482.30 KB, 482304 bytes

MD5: c16826bf2284dc278421706aeb91e29e SHA1: 5e2eed086d7ed79e4ca9ff8927c6c13f1169daeb SHA256: AC237E13D5437F4B04C8BBCD7EE3D11FF193A8F145BDC70E10A113C1A9DE2DFC File Size: 190.08 KB, 190082 bytes

Windows Portable Executable Attributes

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Windows Portable Executable Attributes

This section lists file attributes found within family samples. These attributes are extracted from the files’ Windows PE (Portable Executable) specification and various system flags. Portable Executable Attributes give malware researchers insight into a file’s functionality, executable details, platform and runtime environment.

• File doesn't have "Rich" header
• File doesn't have debug information
• File doesn't have exports table
• File doesn't have relocations information
• File doesn't have security information
• File has exports table
• File is 32-bit executable
• File is either console or GUI application
• File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
• File is Native application (NOT .NET application)

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• File is not packed
• IMAGE_FILE_DLL is not set inside PE header (Executable)
• IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Icons

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File Icons

This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.

File Traits

• dll
• x86

Files Modified

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Files Modified

This section lists files that were created, modified, moved and/or deleted by samples in this family. File system activity can provide valuable insight into how malware functions on the operating system.

File	Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\1clogo.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\accept.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\accept1.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\accept2.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\accept3.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\anon.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\decline.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\gc0	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\getcountry	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\inetc3.dll	Generic Write,Read Attributes

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c:\users\user\appdata\local\temp\nssc178.tmp\install_macintosh_drivers_for_windows_xp_exe.magnet	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\mainpackfull.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\nsdialogs.dll	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\nsisdl.dll	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\save.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\skip.bmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nssc178.tmp\system.dll	Generic Write,Read Attributes

Registry Modifications

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Registry Modifications

This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.

Key::Value	Data	API Name
HKCU\ware\1clickdownloadware\1clickdownload::uid	319481074	RegNtPreCreateKey
HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::proxybypass		RegNtPreCreateKey
HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::intranetname		RegNtPreCreateKey
HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::uncasintranet		RegNtPreCreateKey
HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::autodetect		RegNtPreCreateKey

Windows API Usage

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Windows API Usage

This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.

Category	API
Syscall Use	ntdll.dll!NtAlpcSendWaitReceivePort ntdll.dll!NtClose ntdll.dll!NtCreateFile ntdll.dll!NtCreateSection ntdll.dll!NtFreeVirtualMemory ntdll.dll!NtMapViewOfSection ntdll.dll!NtOpenFile ntdll.dll!NtOpenKey ntdll.dll!NtOpenProcessToken ntdll.dll!NtProtectVirtualMemory Show More ntdll.dll!NtQueryAttributesFile ntdll.dll!NtQueryDebugFilterState ntdll.dll!NtQueryInformationProcess ntdll.dll!NtQueryInformationThread ntdll.dll!NtQueryInformationToken ntdll.dll!NtQuerySystemInformationEx ntdll.dll!NtQueryValueKey ntdll.dll!NtQueryVirtualMemory ntdll.dll!NtQueryVolumeInformationFile ntdll.dll!NtReadFile ntdll.dll!NtSetEvent ntdll.dll!NtSetInformationFile ntdll.dll!NtSetInformationProcess ntdll.dll!NtSetInformationVirtualMemory ntdll.dll!NtSetInformationWorkerFactory ntdll.dll!NtTestAlert ntdll.dll!NtTraceControl ntdll.dll!NtUnmapViewOfSection ntdll.dll!NtWaitForSingleObject ntdll.dll!NtWriteFile ntdll.dll!NtWriteVirtualMemory win32u.dll!NtUserGetKeyboardLayout win32u.dll!NtUserGetThreadState
Process Shell Execute	CreateProcess
Anti Debug	NtQuerySystemInformation
Process Manipulation Evasion	NtUnmapViewOfSection
Network Winsock2	WSAStartup
Network Winsock	closesocket gethostbyname inet_addr socket
Network Wininet	HttpOpenRequest HttpQueryInfo HttpSendRequest InternetConnect InternetOpen InternetQueryOption InternetReadFile

Shell Command Execution

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Shell Command Execution

This section lists Windows shell commands that are run by the samples in this family. Windows Shell commands are often leveraged by malware for nefarious purposes and can be used to elevate security privileges, download and launch other malware, exploit vulnerabilities, collect and exfiltrate data, and hide malicious activity.

C:\WINDOWS\SysWOW64\rundll32.exe C:\WINDOWS\system32\rundll32.exe c:\users\user\downloads\47e8debf5f501005bfef070b2ceefa73751eebf0_0000444928.,LiQMAxHB

C:\WINDOWS\SysWOW64\rundll32.exe C:\WINDOWS\system32\rundll32.exe c:\users\user\downloads\0ca964209f8e51995111386779861dbb9291835c_0000482304.,LiQMAxHB