VirTool:Win32/Obfuscator.ACH

What is VirTool:Win32/Obfuscator.ACH infection?

In this article you will certainly find concerning the definition of VirTool:Win32/Obfuscator.ACH as well as its unfavorable effect on your computer. Such ransomware are a type of malware that is clarified by on the internet fraudulences to demand paying the ransom by a target.

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Most of the cases, VirTool:Win32/Obfuscator.ACH ransomware will instruct its victims to initiate funds transfer for the objective of counteracting the changes that the Trojan infection has presented to the sufferer’s gadget.

VirTool:Win32/Obfuscator.ACH 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.
  • Compression (or decompression);
  • 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;
  • Starts servers listening on 0.0.0.0:10791, :0;
  • 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.
  • Uses Windows utilities for basic functionality;
  • Code injection with CreateRemoteThread in a remote process;
  • Attempts to stop active services;
  • Tries to unhook or modify Windows functions monitored by Cuckoo;
  • Creates or sets a registry key to a long series of bytes, possibly to store a binary or malware config;
  • 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 Zeus (Banking Trojan) mutexes;
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Attempts to modify browser security settings;
  • Attempts to interact with an Alternate Data Stream (ADS);
  • Creates a slightly modified copy of itself;
  • 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.
  • Clears web history;
  • Ciphering the papers found on the victim’s hard drive — so the target can no more use the data;
  • Preventing routine access to the sufferer’s workstation;

VirTool:Win32/Obfuscator.ACH

The most typical networks through which VirTool:Win32/Obfuscator.ACH Ransomware are infused are:

  • By ways of phishing e-mails;
  • As an effect of individual ending up on a resource that holds a malicious software program;

As quickly as the Trojan is effectively injected, it will certainly either cipher the data on the sufferer’s PC or protect against the gadget from functioning in an appropriate manner – while also positioning a ransom note that points out the demand for the targets to impact the payment for the function of decrypting the papers or restoring the documents system back to the first problem. In a lot of instances, the ransom money note will come up when the client restarts the PC after the system has actually currently been damaged.

VirTool:Win32/Obfuscator.ACH distribution channels.

In different corners of the globe, VirTool:Win32/Obfuscator.ACH grows by leaps as well as bounds. Nonetheless, the ransom money notes and also tricks of extorting the ransom money amount may differ depending upon specific local (regional) settings. The ransom money notes and tricks of extorting the ransom quantity might differ depending on certain regional (regional) settings.

Ransomware injection

For instance:

    Faulty informs regarding unlicensed software application.

    In certain locations, the Trojans frequently wrongfully report having identified some unlicensed applications allowed on the sufferer’s gadget. The sharp then requires the user to pay the ransom money.

    Faulty declarations concerning illegal web content.

    In nations where software application piracy is much less prominent, this approach is not as efficient for the cyber frauds. Alternatively, the VirTool:Win32/Obfuscator.ACH popup alert may wrongly declare to be deriving from a police organization as well as will report having situated child porn or other illegal data on the tool.

    VirTool:Win32/Obfuscator.ACH popup alert might incorrectly declare to be acquiring from a law enforcement institution and also will report having located youngster porn or other unlawful data on the gadget. The alert will in a similar way have a demand for the customer to pay the ransom money.

Technical details

File Info:

crc32: 72932F7E
md5: 3e2f63be3782c9040833f25aa55facd0
name: 3E2F63BE3782C9040833F25AA55FACD0.mlw
sha1: 3d31cdfe31f37be3a817d4672a0eb51283643cf9
sha256: 7753b7b37b0a8b8b527fb7228b16d8a301f12875eb333b2eb911e528a0fbd27d
sha512: a08f4a285e1c6274b6fc39c23adccf0d10fdef544ad75ec222d9db6f41f1647cb8cc070d14275e8028ccda2a20ce2ce054525a7e285b3b11b052ab2920d0c977
ssdeep: 6144:l3DnH+BD7ggofL6uJRjY8wtNEGwKXk7hva:ZH+BRofVJGXwk7
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: xa9 Microsoft Corporation. All rights reserved.
InternalName: MSRATING
FileVersion: 6.00.2600.0000 (xpclient.010817-1148)
CompanyName: Microsoft Corporation
ProductName: Microsoftxae Windowsxae Operating System
OleSelfRegister:
ProductVersion: 6.00.2600.0000
FileDescription: Internet Ratings and Local User Management DLL
OriginalFilename: MSRATING.DLL
Translation: 0x0409 0x04b0

VirTool:Win32/Obfuscator.ACH also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Spyware ( 000287dc1 )
Elastic malicious (high confidence)
DrWeb Trojan.PWS.Panda.2363
Cynet Malicious (score: 100)
CAT-QuickHeal TrojanPWS.Zbot.Gen
ALYac Trojan.Ransom.Cerber.1
Cylance Unsafe
Zillya Trojan.Yakes.Win32.4888
Sangfor Ransom.Win32.Cerber_67.se
CrowdStrike win/malicious_confidence_100% (D)
Alibaba TrojanSpy:Win32/Obfuscator.3c142a44
K7GW Spyware ( 000287dc1 )
Cybereason malicious.e3782c
Cyren W32/Zbot.IT.gen!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Kryptik.AJGE
APEX Malicious
Avast Win32:Cryptor
Kaspersky Trojan-Spy.Win32.Zbot.elqq
BitDefender Trojan.Ransom.Cerber.1
NANO-Antivirus Trojan.Win32.Zbot.vkqco
SUPERAntiSpyware Trojan.Agent/Gen-Graftor
MicroWorld-eScan Trojan.Ransom.Cerber.1
Tencent Malware.Win32.Gencirc.10b40627
Ad-Aware Trojan.Ransom.Cerber.1
Sophos Mal/Generic-R + Mal/Zbot-IV
Comodo TrojWare.Win32.Spy.Zbot.AJM@4q3hmb
BitDefenderTheta Gen:NN.ZexaF.34628.wq1@au98Sbfi
VIPRE Trojan.Win32.Reveton.a (v)
TrendMicro TROJ_SPNR.30BC13
McAfee-GW-Edition BehavesLike.Win32.ZBot.fh
FireEye Generic.mg.3e2f63be3782c904
Emsisoft Trojan.Ransom.Cerber.1 (B)
SentinelOne Static AI – Malicious PE
Jiangmin TrojanSpy.Zbot.chal
Webroot Trojanspy:Win32/Fitmu.A
Avira TR/Graftor.385561
eGambit Generic.Malware
Kingsoft Win32.Troj.Zbot.(kcloud)
Microsoft VirTool:Win32/Obfuscator.ACH
Arcabit Trojan.Ransom.Cerber.1
AegisLab Trojan.Win32.Generic.lAAF
GData Trojan.Ransom.Cerber.1
TACHYON Trojan-Spy/W32.ZBot.369152.X
AhnLab-V3 Spyware/Win32.Zbot.R53013
Acronis suspicious
McAfee PWS-Zbot.gen.ajj
MAX malware (ai score=100)
VBA32 BScope.Backdoor.Sinowal.5
Panda Trj/Genetic.gen
TrendMicro-HouseCall TROJ_SPNR.30BC13
Rising Spyware.Zbot!8.16B (CLOUD)
Yandex Trojan.GenAsa!oOHKOSm/HH8
Ikarus Trojan.Win32.Yakes
Fortinet W32/Bublik.AM!tr
AVG Win32:Cryptor
Qihoo-360 Win32/Trojan.Zbot.HxQB4b0A

How to remove VirTool:Win32/Obfuscator.ACH 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 VirTool:Win32/Obfuscator.ACH 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 VirTool:Win32/Obfuscator.ACH 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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