PUP.Bulz.LG
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.
| Threat Level: | 10 % (Normal) |
| First Seen: | December 16, 2024 |
| Last Seen: | October 27, 2026 |
| OS(es) Affected: | Windows |
PUP.Bulz.LG is a detection name used to identify a Potentially Unwanted Program (PUP) that targets Windows computers. While it is not classified as highly dangerous, its presence on a system is generally considered undesirable because of the disruptive and sometimes privacy-invasive behaviors associated with this category of software. PUP.Bulz.LG has been observed on Windows systems, with detections recorded from mid-December 2024 through late 2026, indicating it has remained active over an extended period.
Table of Contents
What PUP.Bulz.LG Does
Like other members of the PUP.Bulz family, PUP.Bulz.LG is a native 64-bit Windows application built using the Go programming language, a detail revealed by its file structure. It typically runs as a console application rather than presenting a traditional graphical interface, which means it can operate with little to no visible indication that it is active. The program lacks standard identifying information such as a digital signature, version details, or resource data, all of which can make it harder for users and some security tools to recognize at a glance.
Once active, PUP.Bulz.LG may perform actions typical of this software family, including writing files to temporary directories, establishing network connections, and querying system information such as the computer's name. These behaviors suggest the program may communicate with remote servers and gather basic details about the infected machine. Many PUPs in this category are also known to alter browser settings, install unwanted toolbars or extensions, and display intrusive advertisements, though not every sample necessarily exhibits all of these traits.
How It Usually Gets Onto Computers
PUPs like PUP.Bulz.LG commonly spread through software bundling, where they are packaged alongside free or pirated applications that users intentionally download. During installation, the unwanted component may be included as a pre-selected option that users can easily overlook. In other cases, these programs infiltrate systems via deceptive advertisements, fake software update prompts, or third-party download portals that bundle additional software without clear disclosure.
Risks for the User
Although rated at the lowest danger level, PUP.Bulz.LG can still create problems for affected users. Potential risks include unwanted network activity that consumes bandwidth, exposure of basic system information to remote parties, degraded system performance, and the possibility of additional unwanted software being installed as a result of bundling. Users may also encounter unexpected changes to their browsing experience, such as new toolbars or altered default settings, which are common hallmarks of this software category.
Signs of Infection
Users who have this PUP on their system might notice unfamiliar files appearing in temporary folders, unexpected processes running in the background, slower overall system performance, or unusual network activity. Changes to browser behavior, such as a different homepage or new toolbars that were not intentionally installed, can also be a warning sign.
How to Stay Protected
To reduce the risk of encountering PUP.Bulz.LG and similar programs, users should download software only from official and trusted sources, carefully review installation screens for pre-checked optional offers, and avoid rushing through setup wizards. Keeping the operating system and security software updated, along with performing regular system scans, can help detect and remove unwanted programs before they cause further issues.
Analysis Report
General information
| Family Name: | PUP.Bulz.LG |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
c8820b30c0eddecf1f704cb853456f37
SHA1:
3a935bacdbfb94907100fb07cca98a64d992508a
SHA256:
5618364F596D107AD6ACD4B632A0D351699B7ADF9D7ECD43965157189AEE0958
File Size:
4.47 MB, 4468288 bytes
|
Windows Portable Executable Attributes
- 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 resources
- File doesn't have security information
- File is 64-bit executable
- File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
- File is either console or GUI application
- File is Native application (NOT .NET application)
Show 3 more
- 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 Traits
- golang
- No Version Info
- x64
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: | 545 |
|---|---|
| Potentially Malicious Blocks: | 1 |
| Whitelisted Blocks: | 544 |
| 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.- Bulz.LG
- Bulz.PB
- Go.Agent.B
Files Modified
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 |
|---|---|
| \device\namedpipe\wkssvc | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\appdata\local\temp\overdrive.exe | Generic Read,Write Data,Write Attributes,Write extended,Append data |
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 |
|---|---|---|
| HKLM\software\microsoft\windows\currentversion\run::overdrive | C:\Users\Xreijsud\AppData\Local\Temp\overdrive.exe | 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 |
|---|---|
| Syscall Use |
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| Network Winsock2 |
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| Network Winsock |
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| User Data Access |
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