Worm:Win32/Arhost.C

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

What is Worm:Win32/Arhost.C infection?

In this post you will find about the meaning of Worm:Win32/Arhost.C as well as its adverse influence on your computer. Such ransomware are a type of malware that is elaborated by on-line scams to require paying the ransom by a sufferer.

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Most of the instances, Worm:Win32/Arhost.C infection will advise its targets to launch funds move for the objective of reducing the effects of the changes that the Trojan infection has introduced to the sufferer’s tool.

Worm:Win32/Arhost.C Summary

These alterations can be as complies with:

  • 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);
  • Attempts to connect to a dead IP:Port (1 unique times);
  • 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.
  • 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;
  • Executed a process and injected code into it, probably while unpacking;
  • Checks for the presence of known windows from debuggers and forensic tools;
  • 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.
  • Detects VirtualBox through the presence of a registry key;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the documents located on the sufferer’s hard disk — so the sufferer can no longer use the information;
  • Preventing regular accessibility to the sufferer’s workstation;
Similar behavior
Related domains
z.whorecord.xyz Ransom:Win32/Blocker.9b81a272
a.tomx.xyz Ransom:Win32/Blocker.9b81a272

Worm:Win32/Arhost.C

The most typical networks through which Worm:Win32/Arhost.C are infused are:

  • By means of phishing emails;
  • As a repercussion of user ending up on a source that hosts a malicious software;

As quickly as the Trojan is efficiently infused, it will certainly either cipher the information on the victim’s computer or avoid the device from operating in a proper fashion – while likewise placing a ransom money note that points out the requirement for the targets to impact the settlement for the function of decrypting the files or recovering the data system back to the preliminary problem. In most instances, the ransom note will certainly turn up when the client restarts the COMPUTER after the system has already been harmed.

Worm:Win32/Arhost.C distribution channels.

In numerous edges of the globe, Worm:Win32/Arhost.C grows by leaps as well as bounds. Nevertheless, the ransom money notes and also techniques of extorting the ransom money amount may vary relying on particular local (local) settings. The ransom notes and also methods of obtaining the ransom money quantity may differ depending on particular neighborhood (local) settings.

Ransomware injection

For instance:

    Faulty notifies about unlicensed software application.

    In certain areas, the Trojans often wrongfully report having actually identified some unlicensed applications enabled on the target’s gadget. The alert after that requires the user to pay the ransom money.

    Faulty declarations concerning unlawful content.

    In countries where software program piracy is less popular, this approach is not as efficient for the cyber frauds. Alternatively, the Worm:Win32/Arhost.C popup alert might wrongly assert to be deriving from a law enforcement establishment and also will report having situated kid porn or other illegal information on the tool.

    Worm:Win32/Arhost.C popup alert might falsely declare to be acquiring from a law enforcement institution and will report having situated youngster porn or other unlawful information on the device. The alert will in a similar way have a demand for the user to pay the ransom.

Technical details

File Info:

crc32: 58115EE8
md5: f70204d61c2b140cef7216e7c56f1360
name: F70204D61C2B140CEF7216E7C56F1360.mlw
sha1: 8c82877acaaf3db78a34c3717ffd706ab0a87941
sha256: 09d88d461539d9d1f47a1b49ea3267152c5c8d57fceb94688c006610f1901727
sha512: 0601752a7c6fba01fc72aa3a3bb8186c493fda895c917a9af7af63c2466b9f86f4f7ff75ca5c892aed132f9300664f2cbfc81c40a56df6786745298d4c12fe4b
ssdeep: 3072:DRzDVV3vIV06KJpkHtRB+LaDsZWm+sgnhv/88:DpBV3vIVhKJaHtmLF1+Pnhb
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Worm:Win32/Arhost.C also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus EmailWorm ( 003c363a1 )
Elastic malicious (high confidence)
DrWeb BackDoor.HostBooter.2
Cynet Malicious (score: 100)
ALYac Gen:Trojan.ProcessHijack.imX@amgoyKdi
Cylance Unsafe
Zillya Trojan.Blocker.Win32.35157
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (D)
Alibaba Ransom:Win32/Blocker.9b81a272
K7GW EmailWorm ( 003c363a1 )
Cybereason malicious.61c2b1
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Injector.CILU
APEX Malicious
Avast Win32:Dropper-gen [Drp]
ClamAV Win.Worm.Generickdv-9772477-0
Kaspersky Trojan-Ransom.Win32.Blocker.bbis
BitDefender Gen:Trojan.ProcessHijack.imX@amgoyKdi
NANO-Antivirus Trojan.Win32.Blocker.fhcfdt
MicroWorld-eScan Gen:Trojan.ProcessHijack.imX@amgoyKdi
Tencent Malware.Win32.Gencirc.114d331a
Ad-Aware Gen:Trojan.ProcessHijack.imX@amgoyKdi
Sophos ML/PE-A
Comodo Malware@#1fequ8745fnnj
BitDefenderTheta Gen:NN.ZevbaF.34690.imX@amgoyKdi
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition BehavesLike.Win32.VBObfus.cc
FireEye Generic.mg.f70204d61c2b140c
Emsisoft Gen:Trojan.ProcessHijack.imX@amgoyKdi (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.Blocker.ijn
Avira HEUR/AGEN.1126329
eGambit Generic.Malware
Antiy-AVL Trojan/Generic.ASMalwS.168C53
Microsoft Worm:Win32/Arhost.C
GData Gen:Trojan.ProcessHijack.imX@amgoyKdi
AhnLab-V3 Trojan/Win32.Blocker.C166023
McAfee GenericR-CUC!F70204D61C2B
MAX malware (ai score=100)
VBA32 Hoax.Blocker
Panda Trj/Genetic.gen
Rising Trojan.Win32.Generic.14924056 (C64:YzY0OmIl9mwH+C17)
Yandex Trojan.GenAsa!DYTYYeYobh0
Ikarus Worm.Win32.Arhost
MaxSecure Trojan.Malware.300983.susgen
Fortinet W32/Generic.AP.1EADFC!tr
AVG Win32:Dropper-gen [Drp]
Paloalto generic.ml

How to remove Worm:Win32/Arhost.C virus?

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 Worm:Win32/Arhost.C 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 Worm:Win32/Arhost.C 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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