MSIL/Kryptik.CUO

Written by Robert Bailey

What is MSIL/Kryptik.CUO infection?

In this article you will locate concerning the meaning of MSIL/Kryptik.CUO as well as its negative impact on your computer. Such ransomware are a kind of malware that is specified by on the internet scams to require paying the ransom by a target.

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In the majority of the cases, MSIL/Kryptik.CUO infection will certainly advise its victims to launch funds move for the purpose of reducing the effects of the changes that the Trojan infection has actually introduced to the sufferer’s tool.

MSIL/Kryptik.CUO Summary

These modifications 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.
  • 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.
  • 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.
  • Uses Windows utilities for basic functionality;
  • Sniffs keystrokes;
  • 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;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the papers situated on the target’s disk drive — so the target can no more utilize the data;
  • Preventing regular access to the victim’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.
Similar behavior
Related domains
z.whorecord.xyz HEUR:Trojan-Ransom.MSIL.Blocker.gen
a.tomx.xyz HEUR:Trojan-Ransom.MSIL.Blocker.gen
west501.ddns.net HEUR:Trojan-Ransom.MSIL.Blocker.gen

MSIL/Kryptik.CUO

One of the most regular channels whereby MSIL/Kryptik.CUO Ransomware Trojans are infused are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a repercussion of user winding up on a resource that hosts a destructive software;

As soon as the Trojan is efficiently infused, it will either cipher the information on the target’s computer or stop the device from functioning in a correct way – while likewise positioning a ransom money note that states the requirement for the victims to impact the payment for the purpose of decrypting the records or bring back the file system back to the initial problem. In many circumstances, the ransom note will certainly come up when the customer restarts the PC after the system has currently been damaged.

MSIL/Kryptik.CUO circulation networks.

In numerous edges of the globe, MSIL/Kryptik.CUO expands by jumps as well as bounds. Nevertheless, the ransom money notes and techniques of obtaining the ransom quantity might differ relying on particular local (local) setups. The ransom notes as well as techniques of obtaining the ransom amount may vary depending on specific regional (regional) setups.

Ransomware injection

For example:

    Faulty informs concerning unlicensed software.

    In specific locations, the Trojans typically wrongfully report having actually spotted some unlicensed applications enabled on the target’s tool. The alert after that demands the user to pay the ransom money.

    Faulty declarations concerning prohibited web content.

    In nations where software program piracy is less popular, this method is not as efficient for the cyber fraudulences. Conversely, the MSIL/Kryptik.CUO popup alert may incorrectly claim to be originating from a law enforcement establishment and will certainly report having situated youngster porn or various other unlawful information on the tool.

    MSIL/Kryptik.CUO popup alert might wrongly claim to be acquiring from a law enforcement establishment and will report having located child pornography or other unlawful data on the gadget. The alert will similarly have a demand for the user to pay the ransom money.

Technical details

File Info:

crc32: 219EA9A5
md5: a7da2fe62c6e9dfd1cac2d030f490464
name: A7DA2FE62C6E9DFD1CAC2D030F490464.mlw
sha1: 1aa0adba2e35aa7c272c2336ec1ef50fb0f6bffb
sha256: 0fa314b5222c86ccb458060180406fe21e70e64d2d9cd75a23f05b97b5b804b0
sha512: 456c43736b448882ac672e4f45e5923dcc5584fb9dffac4586a6d1b0ab52d807906a80925c21f28be5ba064d448f16a9e21b712dfbf121048a1e431c18819580
ssdeep: 1536:ii0XqiEmIobdwjSoRIzXs4G64rlXDt9hZS7s+:iiqbyoAD884G64XDt7ZS77
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

Translation: 0x0000 0x04b0
LegalCopyright: x626x645x639x628x62cx635x632x62dx62cx632
Assembly Version: 1.0.0.0
InternalName: x67ex62cx644x643x6a4x631x6afx633x644x632x64ax633x626x647x632x649x634x62ex645x624x62dx62ax62dx632x637x632x638x624x62cx62ax643x632x646.exe
FileVersion: 1.0.0.0
CompanyName: x626x645x639x628x62cx635x632x62dx62cx632
LegalTrademarks: x626x645x639x628x62cx635x632x62dx62cx632
Comments: x626x645x639x628x62cx635x632x62dx62cx632
ProductName: x626x645x639x628x62cx635x632x62dx62cx632
ProductVersion: 1.0.0.0
FileDescription: x626x645x639x628x62cx635x632x62dx62cx632
OriginalFilename: x67ex62cx644x643x6a4x631x6afx633x644x632x64ax633x626x647x632x649x634x62ex645x624x62dx62ax62dx632x637x632x638x624x62cx62ax643x632x646.exe

MSIL/Kryptik.CUO also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Trojan ( 004c90fe1 )
Elastic malicious (high confidence)
DrWeb BackDoor.Bladabindi.13678
Cynet Malicious (score: 99)
Cylance Unsafe
Zillya Trojan.Blocker.Win32.41499
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_70% (D)
Alibaba Trojan:MSIL/Kryptik.0314db0c
K7GW Trojan ( 004c90fe1 )
Cybereason malicious.62c6e9
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of MSIL/Kryptik.CUO
APEX Malicious
Avast Win32:Trojan-gen
Kaspersky HEUR:Trojan-Ransom.MSIL.Blocker.gen
BitDefender Gen:Heur.MSIL.Bladabindi.1
NANO-Antivirus Trojan.Win32.Ransom.flpfto
MicroWorld-eScan Gen:Heur.MSIL.Bladabindi.1
Tencent Msil.Trojan.Blocker.Lpbm
Ad-Aware Gen:Heur.MSIL.Bladabindi.1
Sophos Mal/Generic-S
BitDefenderTheta Gen:NN.ZemsilF.34690.em0@aOoD3In
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition Artemis!Trojan
FireEye Generic.mg.a7da2fe62c6e9dfd
Emsisoft Gen:Heur.MSIL.Bladabindi.1 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.MSIL.kvwy
Avira TR/Dropper.Gen
Microsoft Backdoor:MSIL/Bladabindi
Arcabit Trojan.MSIL.Bladabindi.1
AegisLab Trojan.MSIL.Blocker.4!c
GData Gen:Heur.MSIL.Bladabindi.1
AhnLab-V3 Malware/RL.Generic.R253100
McAfee Artemis!A7DA2FE62C6E
MAX malware (ai score=86)
Panda Trj/GdSda.A
Rising Ransom.Blocker!8.12A (CLOUD)
Ikarus Trojan.MSIL.Krypt
Fortinet MSIL/GenKryptik.CUIT!tr
AVG Win32:Trojan-gen
Paloalto generic.ml

How to remove MSIL/Kryptik.CUO virus?

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 MSIL/Kryptik.CUO 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 MSIL/Kryptik.CUO 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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