Ransom:Win32/Critroni

What is Ransom:Win32/Critroni infection?

In this post you will certainly discover about the interpretation of Ransom:Win32/Critroni as well as its unfavorable effect on your computer. Such ransomware are a type of malware that is elaborated by online frauds to require paying the ransom by a sufferer.

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In the majority of the cases, Ransom:Win32/Critroni infection will instruct its sufferers to start funds transfer for the purpose of reducing the effects of the modifications that the Trojan infection has actually introduced to the target’s tool.

Ransom:Win32/Critroni Summary

These alterations can be as follows:

  • 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.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • Injection with CreateRemoteThread in a remote process;
  • 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.
  • A process attempted to delay the analysis task.;
  • Expresses interest in specific running processes;
  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • 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.
  • Executed a process and injected code into it, probably while unpacking;
  • Mimics the file times of a Windows system file;
  • 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;
  • 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;
  • Creates a known CTB-Locker ransomware decryption instruction / key file.;
  • Collects information to fingerprint the system. There are behavioral human characteristics that can be used to digitally identify a person to grant access to systems, devices, or data. Unlike passwords and verification codes, fingerprints are fundamental parts of user’s identities. Among the threats blocked on biometric data processing and storage systems is spyware, the malware used in phishing attacks (mostly spyware downloaders and droppers), ransomware, and Banking Trojans as posing the greatest danger.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the documents found on the sufferer’s hard disk — so the sufferer can no more use the data;
  • Preventing regular accessibility to the victim’s workstation;

Ransom:Win32/Critroni

One of the most common networks through which Ransom:Win32/Critroni Ransomware Trojans are infused are:

  • By ways of phishing emails;
  • As a repercussion of individual ending up on a source that hosts a destructive software program;

As soon as the Trojan is efficiently injected, it will either cipher the information on the target’s computer or avoid the device from operating in a proper fashion – while additionally positioning a ransom note that states the requirement for the victims to impact the settlement for the function of decrypting the papers or restoring the documents system back to the initial problem. In a lot of circumstances, the ransom note will certainly come up when the client reboots the COMPUTER after the system has currently been damaged.

Ransom:Win32/Critroni distribution networks.

In numerous edges of the globe, Ransom:Win32/Critroni grows by leaps as well as bounds. Nevertheless, the ransom notes and methods of extorting the ransom money quantity might vary depending upon specific neighborhood (local) settings. The ransom money notes and also tricks of extorting the ransom quantity might differ depending on particular local (local) settings.

Ransomware injection

For example:

    Faulty informs concerning unlicensed software program.

    In specific locations, the Trojans commonly wrongfully report having found some unlicensed applications enabled on the victim’s gadget. The sharp then demands the individual to pay the ransom money.

    Faulty statements regarding prohibited material.

    In countries where software application piracy is much less preferred, this approach is not as effective for the cyber scams. Alternatively, the Ransom:Win32/Critroni popup alert may wrongly claim to be stemming from a police organization and will report having situated kid pornography or various other illegal data on the tool.

    Ransom:Win32/Critroni popup alert might wrongly assert to be obtaining from a law enforcement institution as well as will certainly report having located child pornography or various other illegal information on the device. The alert will in a similar way include a demand for the customer to pay the ransom money.

Technical details

File Info:

crc32: EA410665
md5: 73b5b2675d4391fe6c59cc596bcd2a04
name: 73B5B2675D4391FE6C59CC596BCD2A04.mlw
sha1: 4a598519786f3646d459ede621337e08d67c1b3f
sha256: 34400196b5de7adde8de4f2d8a5aadd350d1ce06910b9d44c1a17969c42b1b69
sha512: 9b0f5bf43ae7b001a40f9d2742c2558e6961e3058bd67ec92108cbe75dc088ec3cbc8afeb3bd88bb0d9042db36b66cc1cff1054235fdb3ae4d1b659f0e86114f
ssdeep: 12288:BDcMXv3/NEK7s37/shbOnMxrUzbtvC0nNr/Bqoo0Pamhyx/iugcGfAAChCJeTlV:VpX/uqs37/s4MKrRZqLWaE6iUSDX2b
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Ransom:Win32/Critroni also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 0055e3ef1 )
Elastic malicious (high confidence)
DrWeb Trojan.Encoder.4356
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.Critroni.A3
ALYac Gen:Heur.PonyStealer.VmW@ciaCTIB
Cylance Unsafe
Zillya Trojan.CTBLocker.Win32.24
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_90% (D)
Alibaba Ransom:Win32/Onion.dbb325bc
K7GW Trojan ( 0055e3ef1 )
Cybereason malicious.75d439
Symantec ML.Attribute.HighConfidence
ESET-NOD32 Win32/Filecoder.CTBLocker.A
APEX Malicious
Avast Win32:Dropper-gen [Drp]
Kaspersky Trojan-Ransom.Win32.Onion.vys
BitDefender Gen:Heur.PonyStealer.VmW@ciaCTIB
NANO-Antivirus Trojan.Win32.Encoder.ecpxih
MicroWorld-eScan Gen:Heur.PonyStealer.VmW@ciaCTIB
Tencent Win32.Trojan.Onion.Ahyj
Ad-Aware Gen:Heur.PonyStealer.VmW@ciaCTIB
Sophos Mal/Generic-S
Comodo Malware@#n7hvqj4401zn
BitDefenderTheta AI:Packer.196D19E41F
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_CRYPCTB.CBQ165I
McAfee-GW-Edition BehavesLike.Win32.Generic.bc
FireEye Generic.mg.73b5b2675d4391fe
Emsisoft Gen:Heur.PonyStealer.VmW@ciaCTIB (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.Onion.da
Webroot Trojan.Dropper.Gen
Avira HEUR/AGEN.1130126
eGambit Generic.Malware
Kingsoft Win32.Troj.GenericKD.v.(kcloud)
Microsoft Ransom:Win32/Critroni
Arcabit Trojan.PonyStealer.E8C619
AegisLab Trojan.Win32.Onion.4!c
GData Gen:Heur.PonyStealer.VmW@ciaCTIB
AhnLab-V3 Trojan/Win32.CTBLocker.C1448150
McAfee RDN/Ransom.am
MAX malware (ai score=100)
VBA32 Hoax.Onion
Malwarebytes Ransom.CTBLocker
Panda Trj/GdSda.A
TrendMicro-HouseCall Ransom_CRYPCTB.CBQ165I
Rising Ransom.Onion!8.478 (CLOUD)
Yandex Trojan.Onion!s3zC4tX+oGY
Ikarus Trojan.Win32.Filecoder
Fortinet W32/CTBLocker.C!tr.ransom
AVG Win32:Dropper-gen [Drp]
Paloalto generic.ml
Qihoo-360 Win32/Ransom.Generic.HwMAEpsA

How to remove Ransom:Win32/Critroni 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

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 Ransom:Win32/Critroni 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 Ransom:Win32/Critroni 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/products/

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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