Trojan.Downloader.JF
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: | 22,659 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 99 |
| First Seen: | June 12, 2023 |
| Last Seen: | October 18, 2026 |
| OS(es) Affected: | Windows |
Trojan.Downloader.JF is a malicious program classified as a Trojan downloader, designed to quietly infiltrate Windows computers and then fetch and install further malicious components without the user's knowledge. With a danger level rated 8 out of 10, this threat is considered highly dangerous and capable of opening the door to serious compromise of an infected system.
Table of Contents
What Trojan.Downloader.JF Does
Once active on a system, Downloader.JF installs itself stealthily and runs silently in the background, avoiding obvious signs of its presence. Its primary purpose, as its name suggests, is to act as a downloader — a tool that hackers use to deliver additional malicious payloads to an already compromised machine. Beyond downloading extra threats, Downloader.JF may also covertly delete files, install additional unwanted or harmful programs, and carry out other malicious functions behind the scenes. In the worst cases, it may allow attackers to gain complete control over the infected system, effectively giving cybercriminals the same level of access as the legitimate user, or more.
Interestingly, some variants of this Trojan have been observed disguising themselves using file information that mimics legitimate Windows components, such as system utility names and descriptions normally associated with Microsoft. This is a common tactic used by Trojans to appear trustworthy and avoid raising suspicion, since a file that looks like a standard Windows tool is less likely to be questioned by an average user.
How It Usually Gets Onto Computers
Downloader.JF most often spreads by exploiting system vulnerabilities and security flaws. It commonly arrives through software downloaded from malicious or compromised websites, or via email attachments sent from untrusted or unknown sources. These attachments are not limited to obvious executable files like .exe or .pif — attackers have also been known to disguise downloader Trojans as seemingly harmless file types, including .avi or even .jpg files, in order to trick users into opening them.
Risks for the User
Because Downloader.JF can hand over significant control of a system to attackers, the risks associated with an infection are severe. Potential consequences include unauthorized access to personal files and data, installation of additional malware such as spyware, ransomware, or other Trojans, deletion or corruption of important files, and general destabilization of the operating system. Since the Trojan operates silently, users may remain unaware of the compromise for an extended period, giving attackers ample time to cause damage or steal sensitive information.
Signs of Infection
Because downloader Trojans like this one are built to run covertly, obvious symptoms are not always present. However, users may notice unusual system slowdowns, unexpected programs appearing on the computer, unfamiliar processes running in the background, changes to files without explanation, or a general sense that the system is behaving erratically. Any unexpected network activity or unfamiliar files appearing after opening an email attachment or downloading software from an untrusted source should also be treated as a potential warning sign.
How to Stay Protected
To reduce the risk of infection, users should keep their Windows operating system and all installed software fully updated, since Downloader.JF relies on exploiting known vulnerabilities. Avoid downloading software from unofficial or suspicious websites, and never open email attachments from unknown or untrusted senders, regardless of the file extension shown. Regularly backing up important files, exercising caution with unsolicited emails, and using reputable security practices can go a long way toward preventing this and similar Trojan downloader threats from compromising a system.
Analysis Report
General information
| Family Name: | Trojan.Downloader.JF |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
fc611522f31918eb95d4a61381b14ead
SHA1:
14006d7f7603ad19099e857cadd804e5e1c1b5ae
SHA256:
FAE6319279B57C43D4F9CE4BB0B151212861C5902FD538EBB1939E3E02894025
File Size:
732.67 KB, 732672 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- File doesn't have security information
- File is 64-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 |
|---|---|
| Company Name | Microsoft Corporation |
| File Description | Problem Steps Recorder |
| File Version | 6.1.7600.16385 (win7_rtm.090713-1255) |
| Internal Name | psr.exe |
| Legal Copyright | © Microsoft Corporation. All rights reserved. |
| Original Filename | psr.exe |
| Product Name | Microsoft® Windows® Operating System |
| Product Version | 6.1.7600.16385 |
File Traits
- ntdll
- 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: | 523 |
|---|---|
| Potentially Malicious Blocks: | 0 |
| Whitelisted Blocks: | 523 |
| 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.- Downloader.JF
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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