Ransom:Win32/Crowti.A

Written by Robert Bailey

What is Ransom:Win32/Crowti.A infection?

In this article you will certainly discover concerning the interpretation of Ransom:Win32/Crowti.A and also its adverse impact on your computer. Such ransomware are a kind of malware that is clarified by online fraudulences to demand paying the ransom money by a sufferer.

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In the majority of the instances, Ransom:Win32/Crowti.A ransomware will advise its targets to initiate funds move for the purpose of counteracting the modifications that the Trojan infection has presented to the target’s device.

Ransom:Win32/Crowti.A Summary

These adjustments 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.
  • 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.
  • Mimics the system’s user agent string for its own requests;
  • Looks up the external IP address;
  • Uses Windows utilities for basic functionality;
  • Executed a process and injected code into it, probably while unpacking;
  • Deletes its original binary from disk;
  • Attempts to delete volume shadow copies;
  • Attempts to stop active services;
  • Modifies boot configuration settings;
  • 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;
  • Attempts to disable System Restore. System Restore function – allows you to revert the computer’s state (system files, applications, and system settings) to that of a previous point in time, which can be used to recover after a virus attack.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the files situated on the victim’s hard disk drive — so the victim can no more use the data;
  • Preventing regular 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.
Similar behavior
Related domains
ip-addr.esW32.Ransomware_LTK.Trojan
myexternalip.comW32.Ransomware_LTK.Trojan
curlmyip.comW32.Ransomware_LTK.Trojan

Ransom:Win32/Crowti.A

The most typical networks through which Ransom:Win32/Crowti.A are injected are:

  • By ways of phishing e-mails;
  • As a repercussion of user winding up on a source that hosts a harmful software program;

As quickly as the Trojan is efficiently injected, it will certainly either cipher the information on the victim’s PC or protect against the device from functioning in a proper fashion – while additionally putting a ransom money note that points out the need for the targets to effect the settlement for the objective of decrypting the files or bring back the file system back to the preliminary condition. In a lot of circumstances, the ransom money note will certainly come up when the customer restarts the PC after the system has actually already been damaged.

Ransom:Win32/Crowti.A distribution networks.

In different edges of the world, Ransom:Win32/Crowti.A expands by leaps and also bounds. However, the ransom money notes as well as tricks of obtaining the ransom amount might differ depending upon particular local (regional) setups. The ransom money notes and methods of obtaining the ransom amount may vary depending on certain local (regional) setups.

Ransomware injection

For example:

    Faulty notifies regarding unlicensed software application.

    In certain areas, the Trojans commonly wrongfully report having detected some unlicensed applications allowed on the victim’s tool. The sharp after that demands the customer to pay the ransom.

    Faulty statements regarding unlawful web content.

    In countries where software program piracy is less prominent, this method is not as effective for the cyber scams. Conversely, the Ransom:Win32/Crowti.A popup alert might incorrectly assert to be deriving from a police institution and will report having situated kid porn or other unlawful data on the device.

    Ransom:Win32/Crowti.A popup alert may falsely declare to be deriving from a law enforcement organization and will report having situated kid pornography or various other prohibited information on the device. The alert will similarly consist of a demand for the individual to pay the ransom.

Technical details

File Info:

crc32: 6BAAAB1E
md5: 47363b94cee907e2b8926c1be61150c7
name: cryptowall.bin
sha1: ca963033b9a285b8cd0044df38146a932c838071
sha256: 45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d
sha512: 93dfaafc183360829448887a112dd49c90ec5fe50dcd7c7bbc06c1c8daa206eeea5577f726d906446322c731d0520e93700d5ff9cefd730fba347c72b7325068
ssdeep: 3072:xkeyloECBch6ZCGBGSmHJ0y5lj6jdojK7+MGOXpXx8z3Lp7Yoq:xGlnCIwMpj6ijKfxx8z3F0V
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Ransom:Win32/Crowti.A also known as:

GridinSoftTrojan.Ransom.Gen
BkavW32.Ransomware_LTK.Trojan
DrWebTrojan.PWS.Panda.7278
MicroWorld-eScanTrojan.GenericKD.2080196
FireEyeGeneric.mg.47363b94cee907e2
CAT-QuickHealRansom.CryptoWall.WR5
Qihoo-360HEUR/QVM10.1.Malware.Gen
ALYacTrojan.Ransom.CryptoWall
CylanceUnsafe
VIPRETrojan.Win32.CryptoWall.gen
SangforMalware
K7AntiVirusTrojan ( 004fdfd41 )
BitDefenderTrojan.GenericKD.2080196
K7GWTrojan ( 004fdfd41 )
CrowdStrikewin/malicious_confidence_100% (W)
Invinceaheuristic
BitDefenderThetaGen:NN.ZexaF.34090.pqW@aS4@OLd
F-ProtW32/Backdoor2.HXGO
TotalDefenseWin32/Tnega.eXKVaVB
APEXMalicious
Paloaltogeneric.ml
ClamAVWin.Trojan.CryptoWall-1
GDataWin32.Trojan.Agent.RCEBUR
KasperskyTrojan.Win32.Agent.ieva
AlibabaTrojan:Win32/Crowti.015b7c81
NANO-AntivirusTrojan.Win32.Panda.dmhzlh
ViRobotTrojan.Win32.Agent.246272.E
AegisLabTrojan.Win32.Agent.4!c
TencentWin32.Trojan.Raas.Auto
Ad-AwareTrojan.GenericKD.2080196
EmsisoftTrojan.GenericKD.2080196 (B)
ComodoMalware@#2ja7v65iox00f
F-SecureTrojan.TR/Crypt.XPACK.134743
ZillyaBackdoor.Androm.Win32.14641
TrendMicroTROJ_CRYPTWALL.F
McAfee-GW-EditionRansom-CWall.c
Trapminemalicious.high.ml.score
SophosTroj/Vawtrak-AN
IkarusTrojan-Ransom.CryptoWall3
CyrenW32/Backdoor.CNGJ-2770
JiangminBackdoor/Androm.ebf
WebrootW32.Malware.gen
AviraTR/Crypt.XPACK.134743
MAXmalware (ai score=100)
Antiy-AVLTrojan[Backdoor]/Win32.Androm
Endgamemalicious (high confidence)
ArcabitTrojan.Generic.D1FBDC4
SUPERAntiSpywareTrojan.Agent/Gen-Injector
ZoneAlarmTrojan.Win32.Agent.ieva
MicrosoftRansom:Win32/Crowti.A
AhnLab-V3Trojan/Win32.MDA.R131384
Acronissuspicious
McAfeeRansom-CWall.c
VBA32Malware-Cryptor.Inject.gen
MalwarebytesTrojan.Zbot.KE
PandaTrj/WLT.B
ZonerTrojan.Win32.61699
ESET-NOD32Win32/Filecoder.CryptoWall.D
TrendMicro-HouseCallTROJ_CRYPTWALL.F
RisingTrojan.Spy.Win32.Crowti.u (CLOUD)
YandexTrojan.Cryptodef!
SentinelOneDFI – Malicious PE
FortinetW32/Vawtrak.AN!tr
AVGWin32:Androp [Drp]
Cybereasonmalicious.4cee90
AvastWin32:Androp [Drp]
MaxSecureTrojan.Malware.8022911.susgen

How to remove Ransom:Win32/Crowti.A 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 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/Crowti.A 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 Ransom:Win32/Crowti.A 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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