Trojan.Downloader.Agent

What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

What is Trojan.Downloader.Agent infection?

In this article you will certainly find about the definition of Trojan.Downloader.Agent and also its negative effect on your computer system. Such ransomware are a kind of malware that is clarified by on-line frauds to require paying the ransom money by a victim.

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Most of the cases, Trojan.Downloader.Agent virus will instruct its victims to launch funds move for the objective of neutralizing the modifications that the Trojan infection has presented to the sufferer’s device.

Trojan.Downloader.Agent Summary

These alterations can be as follows:

  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • Attempts to connect to a dead IP:Port (905 unique times);
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • A process created a hidden window;
  • 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.
  • HTTP traffic contains suspicious features which may be indicative of malware related traffic;
  • Performs some HTTP requests;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses Windows utilities for basic functionality;
  • Attempts to stop active services;
  • Steals private information from local Internet browsers;
  • 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
  • Exhibits possible ransomware file modification behavior;
  • Ciphering the records found on the victim’s hard disk — so the victim can no longer use the information;
  • Preventing normal access to the sufferer’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.

Trojan.Downloader.Agent

The most typical channels where Trojan.Downloader.Agent are injected are:

  • By means of phishing emails;
  • As a consequence of customer ending up on a source that holds a malicious software;

As quickly as the Trojan is efficiently infused, it will certainly either cipher the information on the victim’s PC or protect against the tool from operating in an appropriate fashion – while likewise positioning a ransom note that states the requirement for the sufferers to effect the settlement for the function of decrypting the records or bring back the documents system back to the preliminary problem. In most circumstances, the ransom note will certainly turn up when the client restarts the PC after the system has actually currently been harmed.

Trojan.Downloader.Agent circulation channels.

In different edges of the world, Trojan.Downloader.Agent expands by jumps and also bounds. However, the ransom money notes and also methods of extorting the ransom money amount might vary depending upon certain regional (local) settings. The ransom notes and tricks of obtaining the ransom money quantity may differ depending on specific neighborhood (local) setups.

Ransomware injection

For example:

    Faulty notifies about unlicensed software.

    In specific locations, the Trojans usually wrongfully report having actually spotted some unlicensed applications made it possible for on the sufferer’s tool. The alert then demands the individual to pay the ransom money.

    Faulty statements about illegal web content.

    In nations where software piracy is much less prominent, this technique is not as effective for the cyber scams. Alternatively, the Trojan.Downloader.Agent popup alert may incorrectly claim to be stemming from a police organization as well as will report having situated child pornography or other illegal data on the gadget.

    Trojan.Downloader.Agent popup alert might incorrectly declare to be acquiring from a legislation enforcement institution and will certainly report having located child porn or various other illegal information on the gadget. The alert will likewise consist of a need for the customer to pay the ransom.

Technical details

File Info:

crc32: 582EBC6C
md5: 680d9c8bb70e38d3727753430c655699
name: down.txt
sha1: 5e72192360bbe436a3f4048717320409fb1a8009
sha256: ddfd1d60ffea333a1565b0707a7adca601dafdd7ec29c61d622732117416545f
sha512: 789e9b295d91229f376840296a3f4680894fd99db574a1d44a5758f0d67d2afd3080b6bff296471928caa815572abf8bf5b3c99fa10c844c897dea3c7782693b
ssdeep: 1536:jALz/A04ZIgZY/zY7lJXST6irxfA9t4lm42OSu4W4UvaEJZLyF:cLECLsxQrrSylT2OSfQvJG
type: MS-DOS executable, MZ for MS-DOS

Version Info:

0: [No Data]

Trojan.Downloader.Agent also known as:

GridinSoft Trojan.Ransom.Gen
MicroWorld-eScan Gen:Trojan.Downloader.fmqaa08eR0ii
CMC Virus.Win32.Sality!O
CAT-QuickHeal Trojandownloader.Generic
McAfee Generic Trojan.KT
Malwarebytes Trojan.Downloader
Sangfor Malware
CrowdStrike win/malicious_confidence_100% (W)
BitDefender Gen:Trojan.Downloader.fmqaa08eR0ii
K7GW Riskware ( 0040eff71 )
K7AntiVirus Riskware ( 0040eff71 )
Arcabit Trojan.Downloader.fmqaa08eR0ii
Invincea heuristic
BitDefenderTheta AI:Packer.C9BEE6111F
Symantec Downloader
ESET-NOD32 Win32/TrojanDownloader.Agent.EXU
APEX Malicious
Paloalto generic.ml
GData Gen:Trojan.Downloader.fmqaa08eR0ii
Kaspersky HEUR:Trojan-Downloader.Win32.Generic
Alibaba TrojanDownloader:Win32/Huskfim.afe17c61
AegisLab Trojan.Win32.Generic.a!c
Tencent Win32.Trojan-downloader.Generic.Wmsz
Endgame malicious (high confidence)
Emsisoft Gen:Trojan.Downloader.fmqaa08eR0ii (B)
F-Secure Trojan.TR/Dropper.Gen
DrWeb Trojan.DownLoader32.46970
VIPRE Trojan.Win32.Generic!BT
TrendMicro TROJ_GEN.R002C0DAE20
McAfee-GW-Edition BehavesLike.Win32.Backdoor.mc
MaxSecure Trojan.Malware.73828041.susgen
Trapmine malicious.high.ml.score
FireEye Generic.mg.680d9c8bb70e38d3
Sophos Mal/Generic-S
SentinelOne DFI – Malicious PE
Cyren W32/Downloader.IVWY-0564
Jiangmin TrojanSpy.Stealer.hn
Webroot W32.Trojan.Gen
Avira TR/Dropper.Gen
Microsoft TrojanDownloader:Win32/Huskfim.A
ZoneAlarm HEUR:Trojan-Downloader.Win32.Generic
Acronis suspicious
ALYac Trojan.Downloader.Agent
MAX malware (ai score=82)
VBA32 suspected of Trojan.Downloader.gen.h
Cylance Unsafe
Panda Trj/CI.A
TrendMicro-HouseCall TROJ_GEN.R002C0DAE20
Rising Dropper.Generic!8.35E (CLOUD)
Ikarus Trojan.Dropper
eGambit Unsafe.AI_Score_99%
Fortinet W32/Generic.EXU!tr.ransom
Ad-Aware Gen:Trojan.Downloader.fmqaa08eR0ii
AVG Win32:Malware-gen
Cybereason malicious.bb70e3
Avast Win32:Malware-gen
Qihoo-360 Generic/HEUR/QVM18.1.8053.Malware.Gen

How to remove Trojan.Downloader.Agent ransomware?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft1

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:

Run 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.

Run Setup.exe

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.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for Trojan.Downloader.Agent 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.

GridinSoft Anti-Malware Scanning

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.

GridinSoft Anti-Malware Scan Result

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:

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If the guide doesn’t help you to remove Trojan.Downloader.Agent you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/comparison

About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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