PUP.Ypack.H
Threat Scorecard
EnigmaSoft Threat Scorecard
EnigmaSoft Threat Scorecards are assessment reports for different malware threats which have been collected and analyzed by our research team. EnigmaSoft Threat Scorecards evaluate and rank threats using several metrics including real-world and potential risk factors, trends, frequency, prevalence, and persistence. EnigmaSoft Threat Scorecards are updated regularly based on our research data and metrics and are useful for a wide range of computer users, from end users seeking solutions to remove malware from their systems to security experts analyzing threats.
EnigmaSoft Threat Scorecards display a variety of useful information, including:
Popularity Rank: The ranking of a particular threat in EnigmaSoft’s Threat Database.
Severity Level: The determined severity level of an object, represented numerically, based on our risk modeling process and research, as explained in our Threat Assessment Criteria.
Infected Computers: The number of confirmed and suspected cases of a particular threat detected on infected computers as reported by SpyHunter.
See also Threat Assessment Criteria.
| Popularity Rank: | 2,558 |
| Threat Level: | 10 % (Normal) |
| Infected Computers: | 69 |
| First Seen: | August 21, 2026 |
| Last Seen: | October 15, 2026 |
| OS(es) Affected: | Windows |
PUP.Ypack.H is a detection name used to identify a potentially unwanted program (PUP) that gets installed on Windows systems, often without the user fully realizing it. While it is not classified as highly dangerous, it belongs to a category of software that can change browser settings, push unwanted content, and generally make a computer less pleasant and less secure to use. This detection has been observed with a file that identifies itself internally as "YandexPin," though the presence of this naming does not mean every file flagged this way originates from an official or trustworthy source.
Table of Contents
What Ypack.H Does
Once active on a system, programs in this family typically focus on manipulating the user's web browsing experience. In this case, the detected sample is built to open specific web pages automatically, redirecting the browser to a predetermined address through commands that launch the default browser and load a particular URL. This kind of behavior is commonly used to drive traffic to certain websites, promote search engines, or generate advertising revenue for whoever distributes the program, rather than to provide any real benefit to the user.
Technically, the program is a native 32-bit Windows application that is not packed, meaning its code is not heavily obfuscated. It does, however, use some system-level functions associated with memory manipulation and process handling, which are sometimes leveraged by software to modify how processes run or to launch other applications silently in the background. The file's digital signature chain points to a root certificate that is not trusted, which is a notable red flag — legitimate, trustworthy software is normally signed with certificates that trace back to a trusted root authority.
How It Usually Gets Onto Computers
PUPs like Ypack.H typically spread through software bundling, where they are included as an additional, often pre-selected, component when a user installs a different, seemingly unrelated program. They can also arrive via deceptive advertisements, fake download buttons, or free software download sites that package extra tools alongside the program the user actually wanted. In many cases, users unknowingly consent to the installation by quickly clicking through setup wizards without reviewing optional components.
Risks for the User
Although rated at a low danger level, this type of program can still create real annoyances and minor security concerns. Typical risks include unwanted changes to browser home pages or default search settings, unexpected pop-up windows, redirected web searches, and a general degradation in system performance due to background processes running without clear purpose. In some cases, this kind of software can also open the door to further unwanted installations or expose users to additional advertising networks.
Signs of Infection
Users affected by this type of PUP may notice their browser automatically opening unfamiliar websites, changes to their homepage or default search engine that they did not make themselves, new toolbars or extensions appearing without explanation, and an increase in advertising pop-ups. A general slowdown in browser or system performance can also be a sign of an unwanted program running in the background.
How to Stay Protected
To avoid PUPs like Ypack.H, users should always choose custom or advanced installation options when setting up new software, carefully reviewing each step for pre-checked boxes that offer additional programs. Downloading software only from official or reputable sources, keeping the operating system and browsers updated, and regularly reviewing installed programs and browser extensions can also help catch unwanted software early. Running periodic system scans and staying cautious with suspicious ads or download prompts further reduces the chances of such programs taking hold.
Analysis Report
General information
| Family Name: | PUP.Ypack.H |
|---|---|
| Signature status: | Root Not Trusted |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
fed6fe4a78ed9f64a2d5b15616608243
SHA1:
f4db0db1e67c973d35a03810d5c6ec5efc76affd
SHA256:
126F66BF87CACEC6221DE23EC39FA1464EF9EBE0231382BF8D2DDF53896FB3BB
File Size:
408.77 KB, 408768 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have 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)
- 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
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.
Windows PE Version Information
Windows PE Version Information
This section displays values and attributes that have been set in the Windows file version information data structure for samples within this family. To mislead users, malware actors often add fake version information mimicking legitimate software.| Name | Value |
|---|---|
| File Description | YandexPin |
| File Version | 3.7.9.0 |
| Internal Name | YandexPin |
| Legal Copyright | Copyright (C) Yandex 2019 |
| Original Filename | YandexPin.exe |
| Product Name | YandexPin |
| Product Version | 3.7.9.0 |
Digital Signatures
Digital Signatures
This section lists digital signatures that are attached to samples within this family. When analyzing and verifying digital signatures, it is important to confirm that the signature’s root authority is a well-known and trustworthy entity and that the status of the signature is good. Malware is often signed with non-trustworthy “Self Signed” digital signatures (which can be easily created by a malware author with no verification). Malware may also be signed by legitimate signatures that have an invalid status, and by signatures from questionable root authorities with fake or misleading “Signer” names.| Signer | Root | Status |
|---|---|---|
| YANDEX LLC | GlobalSign Code Signing Root R45 | Root Not Trusted |
File Traits
- x86
Block Information
Block Information
During analysis, EnigmaSoft breaks file samples into logical blocks for classification and comparison with other samples. Blocks can be used to generate malware detection rules and to group file samples into families based on shared source code, functionality and other distinguishing attributes and characteristics. This section lists a summary of this block data, as well as its classification by EnigmaSoft. A visual representation of the block data is also displayed, where available.| Total Blocks: | 984 |
|---|---|
| Potentially Malicious Blocks: | 114 |
| Whitelisted Blocks: | 870 |
| Unknown Blocks: | 0 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
Similar Families
Similar Families
This section lists other families that share similarities with this family, based on EnigmaSoft’s analysis. Many malware families are created from the same malware toolkits and use the same packing and encryption techniques but uniquely extend functionality. Similar families may also share source code, attributes, icons, subcomponents, compromised and/or invalid digital signatures, and network characteristics. Researchers leverage these similarities to rapidly and effectively triage file samples and extend malware detection rules.- Ypack.H
Registry Modifications
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\software\microsoft\windows\currentversion\explorer::slowcontextmenuentries | `$�!�:i�� +00�� � Gs]XM��� "�2� � FX D�' :D��exA-� �LG=�A��J� �C� | RegNtPreCreateKey |
| HKCU\software\microsoft\windows\currentversion\internet settings\5.0\cache\content::cacheprefix | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\5.0\cache\cookies::cacheprefix | Cookie: | RegNtPreCreateKey |
| HKCU\software\microsoft\windows\currentversion\internet settings\5.0\cache\history::cacheprefix | Visited: | RegNtPreCreateKey |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | �n | 8��"ajg�8 �� �v �� T��������%�� Bx #��$kF&� (�(X�(�)�`*J*9*�"-!R1`1�1HO 1��5,]=� @V� A��D�G�IH[uH�pK��N$N� b"hc�w g�Xh�rj�bk`k�ql(�lR p*q�Xr�BtǤvy�w�ny�9 z��{b� | RegNtPreCreateKey |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | �n � 8��"ajg�8 �� �v �� �� T��������%�� Bx #��$kF&� (�(X�(�)�`*J*9*�"-!R1`1�1HO 1��5,]=� @V� A��D�G�IH[uH�pK��N$N� b"hc�w g�Xh�rj�bk`k�ql(�lR p*q�Xr�BtǤvy�w�nx�d y�9 | RegNtPreCreateKey |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | �n � 8��"ajg�8 �� �v �� �� T��������%�� Bx #��$kF&� (�(X�(�)�`*J*9*�"-!R1`1�1HO 1��5,]=� @V� A��D�G�IH[uH�pK��N$N� b"hc�w g�Xh�rj�bk`k�ql(�lR p*q�Xr�BtǤvy�w�nx�d y�9 | RegNtPreCreateKey |
| HKCU\software\microsoft\edge\elfbeacon::version | 153.0.4234.32 | RegNtPreCreateKey |
Windows API Usage
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 |
|---|---|
| Process Manipulation Evasion |
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| Process Shell Execute |
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| Syscall Use |
Show More
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Shell Command Execution
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.
open www.ya.ru?clid=1961774-1
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"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --edge-skip-compat-layer-relaunch --single-argument http://www.ya.ru/?clid=1961774-1
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