Backdoor.Bifrose.C
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: | 21,317 |
| Threat Level: | 60 % (Medium) |
| Infected Computers: | 37 |
| First Seen: | May 9, 2019 |
| Last Seen: | October 18, 2026 |
| OS(es) Affected: | Windows |
Backdoor.Bifrose.C is a malicious program classified as a backdoor, designed to give remote attackers unauthorized access to a Windows computer while trying to stay hidden from the user and from security software. Once active, it quietly opens a channel that cybercriminals can use to control the infected machine, often without any obvious signs that something is wrong. It has been observed targeting Windows systems and is considered a moderate-to-serious threat due to the level of control it can hand over to attackers.
Table of Contents
What Backdoor.Bifrose.C Does
Backdoor.Bifrose.C is built to bypass normal authentication processes on a compromised system, effectively letting an attacker slip past the usual login and security checks. It may disguise itself as a legitimate installed program or component to avoid raising suspicion. Technical analysis shows that this threat is a native Windows executable that can manipulate running processes and use low-level system calls to interact with memory and files, techniques commonly used by malware to maintain stealth and avoid detection by security tools. It has also been seen using anti-debugging behavior, which helps it resist analysis by researchers and evade monitoring tools. In observed cases, the malware has been launched through legitimate Windows utilities such as rundll32.exe, a technique that can help it blend in with normal system activity and make it harder for users or basic security tools to notice.
How It Usually Gets on Computers
Backdoors like Backdoor.Bifrose.C typically spread by exploiting vulnerabilities in software that is already installed on a system, taking advantage of outdated or unpatched programs. It may also arrive bundled with other malicious payloads, such as viruses, worms, or rootkits, or be dropped onto a system after a user is tricked into opening an infected file, often distributed through deceptive downloads, malicious email attachments, or compromised websites. Because it can take the form of what looks like legitimate installed software, users may not realize they have introduced it onto their computer.
Risks for the User
Once installed, Backdoor.Bifrose.C can give attackers remote, unauthorized access to the infected computer. This can lead to a range of harmful outcomes, including theft of personal or financial information, installation of additional malware, unauthorized monitoring of user activity, and misuse of the computer's resources for further attacks. Because backdoors are designed to work covertly, a compromised system can remain under attacker control for an extended period without the user noticing.
Signs of Infection
Backdoors are intentionally designed to avoid detection, so visible symptoms are often minimal or absent. Users should be alert to warning signs such as unexpected slowdowns, unfamiliar processes running in the background, unusual network activity, programs launching without explanation, or security tools being unexpectedly disabled. Any unexplained changes in system behavior should be treated as a potential red flag.
How to Stay Protected
To reduce the risk of infection, keep your operating system and all installed software fully updated, since Backdoor.Bifrose.C and similar threats often rely on unpatched vulnerabilities. Avoid downloading files or programs from untrusted sources, and be cautious with email attachments and links, even if they appear to come from familiar contacts. Regularly back up important data, use a reputable security solution to scan your system, and monitor for unusual process activity. Practicing safe browsing habits and maintaining updated defenses are key steps in protecting your computer from backdoor threats like this one.
Analysis Report
General information
| Family Name: | Backdoor.Bifrose.C |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
3adf466718a21cb121b1b5895f488534
SHA1:
e4a30920d7eef80e0069ccdc437c82b7e7da32fd
SHA256:
6DF80860F39D1A4714CD9189CE931C602C88D0FE1820701CA2FD471990BCD8E2
File Size:
270.34 KB, 270336 bytes
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Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have debug 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)
- File is not packed
- IMAGE_FILE_DLL is not set inside PE header (Executable)
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- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Traits
- 00 section
- dll
- 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: | 499 |
|---|---|
| Potentially Malicious Blocks: | 1 |
| Whitelisted Blocks: | 371 |
| Unknown Blocks: | 127 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
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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| Process Manipulation Evasion |
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| Process Shell Execute |
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| Anti Debug |
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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.
C:\WINDOWS\SysWOW64\rundll32.exe C:\WINDOWS\system32\rundll32.exe c:\users\user\downloads\e4a30920d7eef80e0069ccdc437c82b7e7da32fd_0000270336.,LiQMAxHB
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