Trojan.Downloader.Gen.ATN
Trojan.Downloader.Gen.ATN is a generic detection name used to identify a type of Trojan horse malware classified as a downloader. Threats detected under this generic name typically share common malicious code patterns or behaviors associated with programs designed to secretly download and install additional malicious files onto a victim's computer. Because it is a generic detection, a specific machine infected with Trojan.Downloader.Gen.ATN could be running any number of variants that behave in slightly different ways, but the core purpose remains the same: to act as a gateway for further infection.
Table of Contents
What This Threat Does
As is typical for Trojan downloaders, Trojan.Downloader.Gen.ATN is not designed to cause direct, visible damage on its own. Instead, its primary job is to quietly connect to a remote server controlled by cybercriminals and retrieve other malicious payloads. These payloads can include additional Trojans, ransomware, spyware, adware, or other unwanted programs. Once the additional malware is downloaded, the Trojan typically installs it silently, often without any visible prompts or warnings, allowing the secondary threats to carry out their own damaging activities, such as stealing data, encrypting files, or hijacking system resources.
Trojans in this category often attempt to establish persistence on the infected system, meaning they try to ensure they continue running even after the computer is restarted. They may also attempt to disable or evade security software to avoid detection and removal, which is a common trait among downloader-type Trojans.
How It Usually Gets Onto Computers
Like most Trojans, this threat typically relies on deception rather than exploiting technical vulnerabilities alone. Common infection methods for Trojan downloaders include malicious email attachments disguised as legitimate documents or invoices, bundled downloads from unofficial or pirated software sources, fake software updates, and deceptive links on compromised or malicious websites. Users are often tricked into opening or running the infected file themselves, believing it to be harmless or useful software.
Risks for the User
The presence of a Trojan downloader on a system poses significant risk because it opens the door to further, potentially more damaging infections. Users may experience data theft, financial loss, identity theft, system instability, or a complete compromise of their personal and sensitive information depending on what additional malware is delivered. Because the downloaded payloads can vary, the full extent of the damage is often unpredictable at the time of initial infection.
Signs of Infection
Since Trojan downloaders are designed to operate covertly, visible symptoms may be minimal or absent. However, users might notice unusual network activity, unexpected slowdowns in system performance, unfamiliar programs appearing on the system, increased pop-ups or browser redirects, or security software being unexpectedly disabled. Any of these signs could indicate the presence of this or a similar threat.
How to Stay Protected
To reduce the risk of infection, users should avoid downloading software from untrustworthy or unofficial sources, exercise caution with email attachments and links from unknown senders, and keep their operating system and applications updated with the latest security patches. Maintaining regular backups of important data and using reputable security tools to scan for threats can also help detect and remove such Trojans before they can download additional malicious payloads. Staying cautious and informed remains one of the most effective defenses against this type of threat.
Analysis Report
General information
| Family Name: | Trojan.Downloader.Gen.ATN |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
63c9f9f9f300984dd59791f1c589e98c
SHA1:
dcf0da520e51f2b7a432ab4a5be2b222148cae1c
SHA256:
DB13C42B90DE58E9E12A98D6FEE80DE1B41846D065F06791CD06E6DEF110DC30
File Size:
476.16 KB, 476160 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 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)
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- 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 | Flavor=Retail |
| Company Name | Microsoft Corporation |
| File Description | ClickOnce |
| File Version | 4.8.4084.0 built by: NET48REL1 |
| Internal Name | dfsvc.exe |
| Legal Copyright | © Microsoft Corporation. All rights reserved. |
| Original Filename | dfsvc.exe |
| Private Build | DDBLD502 |
| Product Name | Microsoft® .NET Framework |
| Product Version | 4.8.4084.0 |
File Traits
- fptable
- 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: | 1,972 |
|---|---|
| Potentially Malicious Blocks: | 104 |
| Whitelisted Blocks: | 1,833 |
| Unknown Blocks: | 35 |
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.- Trojan.Downloader.Gen.ATN
- Trojan.Downloader.Gen.ATY
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\kk1aegld7g\pipe\srvsvc | Generic Read,Write Data,Write Attributes,Write extended,Append data |
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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| Anti Debug |
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| User Data Access |
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| Other Suspicious |
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