Fun4us
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: | 5,853 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 20,848 |
| First Seen: | April 24, 2015 |
| Last Seen: | October 11, 2025 |
| OS(es) Affected: | Windows |
The Fun4us program has versions for Google Chrome and Mozilla Firefox that are used by adware developers to promote sponsored products and services and earn pay-per-click revenue. The modus operandi of Fun4us provides evidence for security experts to classify Fun4us as adware. The Fun4us adware acts similarly to SensePlus, Deal Finder and Winter Web that are known to prevent users from enjoying the Internet. The Fun4us adware is dispersed among computer users by using freeware setup files as vessels. You might want to use the 'Advanced' or 'Custom' option the next time you install a free application in order to avoid installing the Fun4us adware on your PC. Users infected with the Fun4us adware report a torrent of commercials in their web browser, and you may be provided with links to potentially harmful locations. Security experts note that the Fun4us adware might display pop-up windows, banners and ad boxes that may cover your browser surface. Moreover, the Fun4us adware may use tracking cookies and DOM storage data to generate tailor-suited ads. Web surfers that value their online privacy might wish to use a reputable anti-malware tool to remove the Fun4us adware from their machine.
Table of Contents
Analysis Report
General information
| Family Name: | Trojan.Kryptik.BO |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
c515b28b0a907341b1177c3ab8506daf
SHA1:
acd1438afcacb30b2ff7fee2fdcf18ce11980b09
File Size:
466.43 KB, 466432 bytes
|
|
MD5:
967a08d4b080993fc7b1eddafce89073
SHA1:
be1b26580389beed900cd4b4d37d853fb43e8dd5
File Size:
1.57 MB, 1568768 bytes
|
|
MD5:
a928ff6fc100606c996e06c2b39e266a
SHA1:
ff6cfe9473d393e38c1c85968bbeda4d6727f247
SHA256:
B662BBFF1C4A77B1D781AE534281999A617AE215D2F34CFD3CEB9EB05E7E595E
File Size:
3.52 MB, 3518464 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 security information
- 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
Show More
- 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 |
|---|---|
| Comments | http://flylinkdc.blogspot.com/ |
| Company Name | FlylinkDC++ Team |
| File Description |
|
| File Version | 6, 9, 386, 1928 |
| Internal Name | FlylinkDC++ |
| Legal Copyright |
|
| Original Filename |
|
| Product Name |
|
| Product Version | 6.9.386.1928 |
| Production Version | 81.73.44.61 |
| Products Version | 9.68.10.78 |
File Traits
- HighEntropy
- No Version Info
- 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: | 6,650 |
|---|---|
| Potentially Malicious Blocks: | 44 |
| Whitelisted Blocks: | 3,056 |
| Unknown Blocks: | 3,550 |
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Data truncated
0 - Probable Safe Block
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x - Potentially Malicious Block
? - Unknown Block
x - Potentially Malicious Block
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 |
|---|---|
| c:\users\user\downloads\settings\flylinkdc.sqlite | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\downloads\settings\flylinkdc_log.sqlite | 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\classes\dchub:: | URL:Direct Connect Protocol | RegNtPreCreateKey |
| HKLM\software\classes\dchub::url protocol | RegNtPreCreateKey | |
| HKLM\software\classes\dchub\shell\open\command:: | "c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464" /magnet %1 | RegNtPreCreateKey |
| HKLM\software\classes\dchub\defaulticon:: | c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464 | RegNtPreCreateKey |
| HKLM\software\classes\adc:: | URL:Direct Connect Protocol | RegNtPreCreateKey |
| HKLM\software\classes\adc::url protocol | RegNtPreCreateKey | |
| HKLM\software\classes\adc\shell\open\command:: | "c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464" /magnet %1 | RegNtPreCreateKey |
| HKLM\software\classes\adc\defaulticon:: | c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464 | RegNtPreCreateKey |
| HKLM\software\classes\magnet:: | URL:MAGNET URI | RegNtPreCreateKey |
| HKLM\software\classes\magnet::url protocol | (NULL) | RegNtPreCreateKey |
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| HKLM\software\classes\magnet\defaulticon:: | "c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464" /magnet | RegNtPreCreateKey |
| HKLM\software\classes\magnet\shell\open\command:: | "c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464" /magnet %1 | RegNtPreCreateKey |
| HKLM\software\wow6432node\magnet\handlers\dc++:: | FlylinkDC++ | RegNtPreCreateKey |
| HKLM\software\wow6432node\magnet\handlers\dc++::description | Download files from the Direct Connect network | RegNtPreCreateKey |
| HKLM\software\wow6432node\magnet\handlers\dc++::shellexecute | "c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464" /magnet %URL | RegNtPreCreateKey |
| HKLM\software\wow6432node\magnet\handlers\dc++::defaulticon | "c:\users\user\downloads\ff6cfe9473d393e38c1c85968bbeda4d6727f247_0003518464" | RegNtPreCreateKey |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::urn:bitprint | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::urn:tigertree | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::urn:tree:tiger | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::urn:tree:tiger/ | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::urn:tree:tiger/1024 | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::bitprint | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::tigertree | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::tree:tiger | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::tree:tiger/ | RegNtPreCreateKey | |
| HKLM\software\wow6432node\magnet\handlers\dc++\type::tree:tiger/1024 | 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 |
|---|---|
| Network Winsock2 |
|
| Anti Debug |
|
| User Data Access |
|
| Network Winsock |
|
| Keyboard Access |
|
