Worm.Conficker.A
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: | 50 % (Medium) |
| Infected Computers: | 100 |
| First Seen: | October 25, 2018 |
| Last Seen: | October 24, 2025 |
| OS(es) Affected: | Windows |
Worm.Conficker.A is a self-replicating piece of malware that targets computers running the Windows operating system. It belongs to the broader family of Conficker worms, one of the most widely recognized worm outbreaks in the history of malware, and it continues to be detected on vulnerable systems even years after it first appeared. Security monitoring has logged activity tied to this threat from its first detection in late 2018 through to more recent sightings, showing that older worms like this can still linger on unpatched or poorly protected machines.
As with other members of the worm category, Worm.Conficker.A is built to spread on its own, without requiring a user to open an infected file or click a malicious link every time it moves to a new machine. Worms in this family are known for mutating and replacing their own code, which makes them harder to detect using simple signature checks and harder to remove completely once they have taken hold. Unlike a typical virus that inserts itself into existing files, a worm like this one tends to replace or overwrite files and processes, spreading further copies of itself across a network or to other reachable computers.
Table of Contents
How It Typically Spreads
Worms of this type commonly spread by exploiting weaknesses in network services, taking advantage of shared folders, removable drives, or unpatched software vulnerabilities on Windows systems. A typical worm may also replicate by sending copies of itself to contacts found in an infected user's address book or by scanning local networks for other reachable machines to infect. Because this kind of malware does not rely solely on user interaction, a single infected computer on a network can quickly lead to multiple infected systems.
Risks for the User
Worm.Conficker.A is rated as a moderate-to-significant risk, with a danger level that reflects its ability to disrupt normal computer operations and spread without obvious warning signs. Once active, a worm of this kind can degrade system performance, consume network bandwidth as it searches for new targets, and potentially open the door for additional malicious components to be delivered to the infected machine. Its self-mutating nature means that traces of the infection can be difficult to fully eliminate, and remnants may persist or reactivate if not addressed thoroughly.
Signs of Infection
Users dealing with a worm infection like this one may notice unusual network activity, slower-than-normal system or internet performance, unexpected account lockouts, or security tools being disabled or failing to update properly. Some infected systems may also show signs of unauthorized access attempts or unusual outbound connections as the worm attempts to locate and infect additional devices.
Staying Protected
Protecting a Windows computer from threats like Worm.Conficker.A starts with keeping the operating system and all installed software fully updated, since worms frequently rely on known, unpatched vulnerabilities to spread. Using strong, unique passwords, disabling unnecessary shared network resources, and being cautious with removable media such as USB drives can also reduce exposure. Regularly scanning systems with up-to-date security software, maintaining backups of important files, and monitoring for unusual network behavior are all practical steps that help both prevent infection and catch a worm infection early before it can spread further across a home or business network.
Analysis Report
General information
| Family Name: | Worm.Conficker.A |
|---|---|
| Packers: | UPX! |
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
7503573453e6817b68ceca9ffa0e32cc
SHA1:
24061c654ec4526e07eddc018aa5687fe69f5648
SHA256:
50CD3D261DDE2D67223DDF01119E7EC98067E9C977109884C953F1E1404A2A29
File Size:
168.51 KB, 168509 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 resources
- File doesn't have security information
- File has been packed
- 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)
Show More
- IMAGE_FILE_DLL is not set inside PE header (Executable)
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Traits
- big overlay
- dll
- HighEntropy
- packed
- 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: | 347 |
|---|---|
| Potentially Malicious Blocks: | 314 |
| Whitelisted Blocks: | 33 |
| 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.- Conficker.A
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 |
Show More
|
| Process Manipulation Evasion |
|
| Process Shell Execute |
|
| Anti Debug |
|
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\24061c654ec4526e07eddc018aa5687fe69f5648_0000168509.,LiQMAxHB
|
