Trojan.Downloader.UPX
Emily Beck
Updated on April 02, 2026
What is Trojan.Downloader.UPX infection?
In this short article you will certainly find concerning the definition of Trojan.Downloader.UPX as well as its unfavorable influence on your computer system. Such ransomware are a type of malware that is elaborated by on-line fraudulences to require paying the ransom by a victim.
Most of the cases, Trojan.Downloader.UPX ransomware will certainly instruct its victims to start funds transfer for the purpose of neutralizing the changes that the Trojan infection has actually presented to the victim’s gadget.
Trojan.Downloader.UPX Summary
These alterations can be as adheres to:
- Executable code extraction. Cybercriminals often use binary packers to hinder the malicious code from reverse-engineered by malware analysts. A packer is a tool that compresses, encrypts, and modifies a malicious file’s format. Sometimes packers can be used for legitimate ends, for example, to protect a program against cracking or copying.
- Drops a binary and executes it. Trojan-Downloader installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional malware onto the infected computer.
- The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
- The executable is compressed using UPX;
- Deletes its original binary from disk;
- Attempts to repeatedly call a single API many times in order to delay analysis time. This significantly complicates the work of the virus analyzer. Typical malware tactics!
- Installs itself for autorun at Windows startup.
There is simple tactic using the Windows startup folder located at:
C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.The registry run keys perform the same action, and can be located in different locations:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
- Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
- Creates a copy of itself;
- Ciphering the files found on the target’s hard disk drive — so the target can no more make use of the data;
- Preventing routine access to the target’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.
| xdx.s4f5er4t5g1df23saadse.club | Trojan-Ransom.HydraCrypt |
| fk.openyourass.club | Trojan-Ransom.HydraCrypt |
Trojan.Downloader.UPX
The most typical channels where Trojan.Downloader.UPX Ransomware are injected are:
- By methods of phishing emails;
- As a repercussion of user ending up on a source that holds a malicious software;
As soon as the Trojan is successfully injected, it will either cipher the data on the target’s PC or avoid the gadget from operating in a proper way – while also putting a ransom money note that points out the demand for the sufferers to impact the payment for the objective of decrypting the files or restoring the file system back to the preliminary condition. In the majority of instances, the ransom money note will turn up when the customer reboots the PC after the system has actually currently been harmed.
Trojan.Downloader.UPX distribution networks.
In numerous corners of the globe, Trojan.Downloader.UPX grows by leaps as well as bounds. Nevertheless, the ransom notes as well as methods of obtaining the ransom money quantity might differ depending upon specific regional (local) settings. The ransom notes and methods of extorting the ransom money amount might differ depending on particular neighborhood (local) settings.
For instance:
Faulty signals about unlicensed software.
In certain areas, the Trojans often wrongfully report having actually identified some unlicensed applications enabled on the victim’s tool. The alert then demands the customer to pay the ransom.
Faulty statements about illegal content.
In nations where software application piracy is less prominent, this method is not as reliable for the cyber fraudulences. Conversely, the Trojan.Downloader.UPX popup alert might incorrectly assert to be originating from a police establishment as well as will report having located youngster pornography or various other prohibited information on the tool.
Trojan.Downloader.UPX popup alert may falsely declare to be obtaining from a law enforcement establishment and also will certainly report having situated kid porn or various other prohibited information on the gadget. The alert will likewise consist of a requirement for the user to pay the ransom money.
Technical details
File Info:
crc32: 83080E73md5: 8a1dc714b39b7a310e1c4d7a25ea5630name: download.exesha1: 57176a4d3322a5f44b69ac94da1ef93421b660e0sha256: 27e556ab69121c7cdaa0e0cca62f5ea8e888fd2958375412d425616660092c77sha512: dbb1d7711a0478f0f90fd55bf8fa024d4dd6fc3250936e829c8bffe42daa13199039782157c9f0708d74b6b6fdc5281915dfa211f8c89c12d4ac0897c6065f63ssdeep: 1536:+SA7zB/dFUHk5xmltOC9rMy9eMhV8jrYFzflez3a498XL8tNZ:+SA7RdaHkzml/rMy9pH8/YFfl43aG8type: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressedVersion Info:
0: [No Data]
Trojan.Downloader.UPX also known as:
| GridinSoft | Trojan.Ransom.Gen |
| DrWeb | Trojan.DownLoader25.10311 |
| MicroWorld-eScan | Gen:Trojan.Downloader.fmGfa8gFUSbj |
| FireEye | Generic.mg.8a1dc714b39b7a31 |
| CAT-QuickHeal | Trojan.Mauvaise.SL1 |
| McAfee | Artemis!8A1DC714B39B |
| Malwarebytes | Trojan.Downloader.UPX |
| VIPRE | Trojan.Win32.Generic!BT |
| Sangfor | Malware |
| CrowdStrike | win/malicious_confidence_90% (W) |
| BitDefender | Gen:Trojan.Downloader.fmGfa8gFUSbj |
| K7GW | Trojan-Downloader ( 0054d9311 ) |
| K7AntiVirus | Trojan-Downloader ( 0054d9311 ) |
| TrendMicro | Backdoor.Win32.ZEGOST.SMS |
| BitDefenderTheta | Gen:NN.ZexaF.33558.fmGfa8gFUSbj |
| F-Prot | W32/Blackmoon.M.gen!Eldorado |
| Symantec | Trojan Horse |
| APEX | Malicious |
| Avast | Win32:DropperX-gen [Drp] |
| ClamAV | Win.Dropper.Gh0stRAT-6989861-0 |
| GData | Win32.Trojan.Agent.WP |
| Kaspersky | Trojan.Win32.Siscos.wgv |
| Alibaba | TrojanDownloader:Win32/Siscos.4978e4b3 |
| NANO-Antivirus | Trojan.Win32.Tiny.gkwjyw |
| ViRobot | Trojan.Win32.Z.Downloader.92160 |
| AegisLab | Trojan.Win32.Siscos.4!c |
| Rising | Backdoor.Zegost!8.177 (TFE:5:GhyWtHWPdCV) |
| Ad-Aware | Gen:Trojan.Downloader.fmGfa8gFUSbj |
| Emsisoft | Trojan-Downloader.Tiny (A) |
| Comodo | Packed.Win32.MUPX.Gen@24tbus |
| F-Secure | |
| Zillya | Trojan.Siscos.Win32.5587 |
| Invincea | heuristic |
| McAfee-GW-Edition | BehavesLike.Win32.Trojan.nc |
| Sophos | Troj/Agent-AWJO |
| Ikarus | Trojan-Ransom.HydraCrypt |
| Cyren | W32/Blackmoon.M.gen!Eldorado |
| Jiangmin | Trojan.Siscos.on |
| Webroot | W32.Trojan.Gen |
| Avira | HEUR/AGEN.1014775 |
| MAX | malware (ai score=100) |
| Antiy-AVL | Trojan/Win32.Wacatac |
| Endgame | malicious (moderate confidence) |
| Arcabit | Trojan.Downloader.fmGfa8gFUSbj |
| ZoneAlarm | Trojan.Win32.Siscos.wgv |
| Microsoft | Trojan:Win32/Occamy.C |
| AhnLab-V3 | Trojan/Win32.Kryptik.R265106 |
| Acronis | suspicious |
| VBA32 | BScope.Backdoor.BlackHole |
| ALYac | Gen:Trojan.Downloader.fmGfa8gFUSbj |
| Cylance | Unsafe |
| Panda | Trj/Genetic.gen |
| ESET-NOD32 | a variant of Win32/TrojanDownloader.Tiny.NQG |
| TrendMicro-HouseCall | Backdoor.Win32.ZEGOST.SMS |
| Yandex | Trojan.Siscos!qvsRSp3UlMg |
| SentinelOne | DFI – Malicious PE |
| eGambit | Unsafe.AI_Score_99% |
| Fortinet | W32/Kryptik.FHSF!tr |
| AVG | Win32:DropperX-gen [Drp] |
| Cybereason | malicious.4b39b7 |
| Paloalto | generic.ml |
| Qihoo-360 | Win32/Trojan.ee5 |
How to remove Trojan.Downloader.UPX ransomware?
The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.">2.
Download GridinSoft Anti-Malware.
You can download GridinSoft Anti-Malware by clicking the button below:
Download GridinSoft Anti-MalwareRun the setup file.
When setup file has finished downloading, double-click on the install-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
Press “Install” button.
Once installed, Anti-Malware will automatically run.
Wait for the Anti-Malware scan to complete.
GridinSoft Anti-Malware will automatically start scanning your system for Trojan.Downloader.UPX files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.
Click on “Clean Now”.
When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
Are Your Protected?
GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:
Full version of GridinSoft Anti-Malware
If the guide doesn’t help you to remove Trojan.Downloader.UPX you can always ask me in the comments for getting help.
References
- GridinSoft Anti-Malware Review from HowToFix site:
- More information about GridinSoft products:
