Written by Robert Bailey

What is Trojan:Win32/Occamy.C91 infection?

In this short article you will certainly discover concerning the interpretation of Trojan:Win32/Occamy.C91 and also its adverse influence on your computer. Such ransomware are a type of malware that is specified by on-line fraudulences to demand paying the ransom money by a victim.

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Most of the situations, Trojan:Win32/Occamy.C91 virus will certainly advise its sufferers to start funds move for the function of counteracting the changes that the Trojan infection has actually introduced to the victim’s gadget.

Trojan:Win32/Occamy.C91 Summary

These modifications can be as adheres to:

  • Expresses interest in specific running processes;
  • 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.
  • 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;
  • Uses Windows utilities for basic functionality;
  • 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
  • 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.
  • Creates a copy of itself;
  • Ciphering the files located on the sufferer’s hard disk drive — so the target can no more make use of the data;
  • Preventing normal 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.


One of the most common networks where Trojan:Win32/Occamy.C91 are injected are:

  • By ways of phishing e-mails;
  • As an effect of individual winding up on a source that holds a harmful software;

As soon as the Trojan is successfully injected, it will certainly either cipher the data on the victim’s PC or prevent the device from functioning in a correct way – while additionally placing a ransom note that mentions the requirement for the targets to impact the payment for the purpose of decrypting the papers or recovering the file system back to the preliminary condition. In a lot of instances, the ransom note will turn up when the client reboots the PC after the system has already been damaged.

Trojan:Win32/Occamy.C91 distribution networks.

In various corners of the globe, Trojan:Win32/Occamy.C91 expands by leaps and also bounds. However, the ransom notes as well as techniques of obtaining the ransom quantity may differ relying on specific local (local) setups. The ransom money notes and also tricks of obtaining the ransom quantity may vary depending on specific regional (local) setups.

Ransomware injection

As an example:

    Faulty alerts concerning unlicensed software.

    In particular locations, the Trojans typically wrongfully report having actually detected some unlicensed applications enabled on the victim’s device. The sharp after that demands the individual to pay the ransom.

    Faulty statements regarding illegal content.

    In nations where software piracy is less prominent, this approach is not as efficient for the cyber frauds. Alternatively, the Trojan:Win32/Occamy.C91 popup alert might incorrectly declare to be stemming from a law enforcement institution and also will report having situated kid porn or various other illegal information on the device.

    Trojan:Win32/Occamy.C91 popup alert may falsely claim to be acquiring from a legislation enforcement organization and also will report having located kid porn or other illegal data on the gadget. The alert will likewise include a requirement for the individual to pay the ransom money.

Technical details

File Info:

crc32: BE982B99
md5: 206279b5de70dcc19febb085e0895564
name: 206279B5DE70DCC19FEBB085E0895564.mlw
sha1: f1dab5a3c0eb8777b4486758e3ce312b6dee3095
sha256: 916904d3760aec7712975b2aac1a72a28c1c6e03ed0995f6c8c7d1695723538a
sha512: 6c225c99ea02ed24a0fb9ed8df68f2896a208c7e1cab1899e87e35cf44578096ec1e808ddfba6242b6c82a9a8514deabcbf79431befbd0aab525561c799e53ae
ssdeep: 12288:vrOJNY4UV767UResWayXSC5lrzf9imcl6t8UdFeSmKfZ72WjuTTTTTTTT:si764esWaiNf9ibAnwKR2jTTTTTTTT
type: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressed

Version Info:

0: [No Data]

Trojan:Win32/Occamy.C91 also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
Elastic malicious (high confidence)
Cynet Malicious (score: 100)
ALYac Gen:Variant.Ransom.District.1
Cylance Unsafe
Zillya Trojan.Agent.Win32.896284
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_90% (W)
Cybereason malicious.5de70d
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/CrthRazy.G
APEX Malicious
Avast Win32:Malware-gen
Kaspersky HEUR:Trojan.Win32.Razy.gen
BitDefender Gen:Variant.Ransom.District.1
NANO-Antivirus Trojan.Win32.Graftor.famdxr
MicroWorld-eScan Gen:Variant.Ransom.District.1
Tencent Win32.Trojan.Razy.Hoek
Ad-Aware Gen:Variant.Ransom.District.1
Sophos Generic ML PUA (PUA)
Comodo Application.Win32.Linkury.BO@8jyytq
BitDefenderTheta Gen:NN.ZexaF.34678.KmHfaSYvHfhi
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition BehavesLike.Win32.Dropper.hc
Emsisoft Gen:Variant.Ransom.District.1 (B)
SentinelOne Static AI – Malicious PE
Avira HEUR/AGEN.1122969
Microsoft Trojan:Win32/Occamy.C91
AegisLab Trojan.Win32.Generic.4!c
GData Gen:Variant.Ransom.District.1
AhnLab-V3 Malware/Win32.Generic.C2845375
McAfee Artemis!206279B5DE70
MAX malware (ai score=97)
Malwarebytes Malware.AI.3428555217
Panda Trj/GdSda.A
Rising Trojan.Agent!8.B1E (CLOUD)
Ikarus Trojan.Win32.Agent
MaxSecure Trojan.Malware.21919250.susgen
Fortinet W32/Agent.VBY!tr
AVG Win32:Malware-gen
Qihoo-360 Win32/Trojan.Razy.HwsBHoEA

How to remove Trojan:Win32/Occamy.C91 ransomware?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft2.

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 setup-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:Win32/Occamy.C91 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:

Full version of GridinSoft

Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove Trojan:Win32/Occamy.C91 you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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About the author

Robert Bailey

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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