Win32/Corebot.A

What is Win32/Corebot.A infection?

In this post you will find regarding the meaning of Win32/Corebot.A as well as its adverse influence on your computer system. Such ransomware are a form of malware that is specified by online fraudulences to require paying the ransom by a target.

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When we talk about the intrusion of unfamiliar programs into your computer’s work, the proverb “Forewarned is forearmed” describes the situation as accurately as possible. Gridinsoft Anti-Malware is exactly the tool that is always useful to have in your armory: fast, efficient, up-to-date. It is appropriate to use it as an emergency help at the slightest suspicion of infection.
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In the majority of the situations, Win32/Corebot.A ransomware will certainly advise its victims to launch funds transfer for the purpose of neutralizing the amendments that the Trojan infection has actually presented to the sufferer’s gadget.

Win32/Corebot.A Summary

These adjustments 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);
  • 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.
  • Possible date expiration check, exits too soon after checking local time;
  • A process attempted to delay the analysis task.;
  • At least one IP Address, Domain, or File Name was found in a crypto call;
  • 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;
  • 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 copy of itself;
  • Attempts to create or modify system certificates;
  • Ciphering the documents found on the victim’s disk drive — so the sufferer can no more make use of the data;
  • Preventing regular access to the sufferer’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.

Win32/Corebot.A

One of the most typical networks where Win32/Corebot.A Trojans are injected 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 consequence of individual ending up on a resource that hosts a harmful software program;

As soon as the Trojan is efficiently injected, it will certainly either cipher the data on the victim’s computer or stop the tool from operating in a proper way – while likewise placing a ransom money note that states the need for the targets to effect the repayment for the purpose of decrypting the papers or restoring the data system back to the preliminary condition. In a lot of instances, the ransom note will turn up when the customer reboots the COMPUTER after the system has already been harmed.

Win32/Corebot.A circulation networks.

In different edges of the world, Win32/Corebot.A expands by jumps as well as bounds. Nonetheless, the ransom notes and techniques of extorting the ransom quantity might vary depending upon particular neighborhood (regional) setups. The ransom money notes as well as tricks of extorting the ransom money amount might differ depending on certain local (regional) setups.

Ransomware injection

As an example:

    Faulty signals concerning unlicensed software program.

    In specific areas, the Trojans usually wrongfully report having actually found some unlicensed applications allowed on the target’s tool. The alert after that demands the customer to pay the ransom.

    Faulty statements concerning unlawful content.

    In countries where software program piracy is less preferred, this method is not as reliable for the cyber frauds. Conversely, the Win32/Corebot.A popup alert may incorrectly claim to be deriving from a police organization and also will certainly report having located child pornography or other unlawful data on the tool.

    Win32/Corebot.A popup alert might wrongly declare to be obtaining from a legislation enforcement institution and will certainly report having situated youngster porn or various other prohibited information on the gadget. The alert will similarly contain a need for the customer to pay the ransom.

Technical details

File Info:

crc32: 41614197
md5: 1b65167b85bd773e9082f39350646c61
name: 1B65167B85BD773E9082F39350646C61.mlw
sha1: d2780fd7e95df8a2d2aa7d99ac331d7b007005ad
sha256: d45f578cc3cd36a0a7b9dae83c9b0f5c8c3e4049e725e02fabfd8eafdc7cd781
sha512: f86405c63a16f45310af4dd38f43f51ca1da23230623f48caa4c00703ad0dbb80e162216d6f2ed4559a4a0e5804acb956a82bc562818b2291557f33097a45914
ssdeep: 6144:na+C+C+C+C+C+C+0EO+0UgYQafyIrBpQW:a+C+C+C+C+C+C+0j+5gqy2
type: PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows

Version Info:

0: [No Data]

Win32/Corebot.A also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 005190011 )
Elastic malicious (high confidence)
DrWeb BackDoor.CoreBot.32
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.Cerber.ZZ5
ALYac Gen:Heur.Ransom.Lukitos.1
Cylance Unsafe
Zillya Trojan.Corebot.Win32.1
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba VirTool:Win32/Obfuscator.4776468d
K7GW Trojan ( 005190011 )
Cybereason malicious.b85bd7
Symantec Packed.Generic.493
ESET-NOD32 Win32/Corebot.A
APEX Malicious
Avast Win32:Filecoder-BI [Trj]
ClamAV Win.Packed.Gamarue-7133670-1
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Gen:Heur.Ransom.Lukitos.1
NANO-Antivirus Trojan.Win32.Androm.fukskn
MicroWorld-eScan Gen:Heur.Ransom.Lukitos.1
Tencent Malware.Win32.Gencirc.10ba146c
Ad-Aware Gen:Heur.Ransom.Lukitos.1
Sophos Mal/Generic-R + Mal/Elenoocka-E
Comodo Malware@#3k1yv41krig9u
BitDefenderTheta Gen:NN.ZexaF.34628.oqW@aGrfcag
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_CERBER.SMALY0
McAfee-GW-Edition BehavesLike.Win32.Generic.dc
FireEye Generic.mg.1b65167b85bd773e
Emsisoft Gen:Heur.Ransom.Lukitos.1 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Backdoor.Androm.raw
Avira HEUR/AGEN.1120889
eGambit Unsafe.AI_Score_97%
Microsoft VirTool:Win32/Obfuscator.ARL
AegisLab Trojan.Win32.Generic.4!c
GData Win32.Trojan-Ransom.Locky.EA
AhnLab-V3 Backdoor/Win32.Androm.R206220
Acronis suspicious
McAfee GenericRXCA-LP!1B65167B85BD
MAX malware (ai score=81)
VBA32 Trojan.FakeAV.01657
Malwarebytes Malware.AI.3472099708
Panda Trj/GdSda.A
TrendMicro-HouseCall Ransom_CERBER.SMALY0
Rising Backdoor.Androm!8.113 (TFE:2:FuI8bbaYyPO)
Yandex Trojan.GenAsa!WhRGsH4raVE
Ikarus Trojan.Win32.Corebot
Fortinet W32/GenKryptik.APXF!tr
AVG Win32:Filecoder-BI [Trj]
Qihoo-360 Win32/Ransom.Filecoder.HgIASOkA

How to remove Win32/Corebot.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

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 Win32/Corebot.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 Win32/Corebot.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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