Backdoor:Win32/Nosrawec.A

What is Backdoor:Win32/Nosrawec.A infection?

In this short article you will find about the definition of Backdoor:Win32/Nosrawec.A and also its unfavorable effect on your computer system. Such ransomware are a kind of malware that is specified by online frauds to demand paying the ransom by a sufferer.

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Most of the situations, Backdoor:Win32/Nosrawec.A virus will certainly instruct its sufferers to launch funds transfer for the purpose of counteracting the modifications that the Trojan infection has introduced to the target’s device.

Backdoor:Win32/Nosrawec.A Summary

These adjustments can be as adheres to:

  • Injection (inter-process);
  • Injection (Process Hollowing);
  • 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.
  • A process created a hidden window;
  • 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;
  • 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;
  • Ciphering the documents situated on the victim’s disk drive — so the target can no more use 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.

Backdoor:Win32/Nosrawec.A

One of the most normal networks through which Backdoor:Win32/Nosrawec.A Trojans are injected are:

  • By means of phishing emails;
  • As an effect of customer winding up on a resource that organizes a malicious software program;

As soon as the Trojan is successfully injected, it will certainly either cipher the data on the victim’s PC or avoid the gadget from working in an appropriate way – while additionally placing a ransom note that discusses the demand for the sufferers to effect the payment for the function of decrypting the documents or restoring the documents system back to the first condition. In many circumstances, the ransom note will show up when the customer restarts the PC after the system has actually currently been damaged.

Backdoor:Win32/Nosrawec.A circulation channels.

In various edges of the globe, Backdoor:Win32/Nosrawec.A grows by leaps as well as bounds. Nonetheless, the ransom notes and techniques of obtaining the ransom amount may differ depending on certain regional (regional) settings. The ransom notes and techniques of extorting the ransom amount might vary depending on certain local (regional) setups.

Ransomware injection

For example:

    Faulty signals regarding unlicensed software.

    In certain locations, the Trojans commonly wrongfully report having discovered some unlicensed applications made it possible for on the sufferer’s tool. The alert then demands the user to pay the ransom.

    Faulty statements regarding illegal web content.

    In countries where software program piracy is much less prominent, this approach is not as efficient for the cyber scams. Conversely, the Backdoor:Win32/Nosrawec.A popup alert might wrongly assert to be originating from a law enforcement institution and will certainly report having located child pornography or other illegal information on the gadget.

    Backdoor:Win32/Nosrawec.A popup alert might incorrectly declare to be acquiring from a law enforcement institution as well as will report having located child pornography or other illegal information on the gadget. The alert will in a similar way consist of a need for the user to pay the ransom.

Technical details

File Info:

crc32: 789F07C0
md5: ae25be1b25da22b70921e5aafc9d045e
name: AE25BE1B25DA22B70921E5AAFC9D045E.mlw
sha1: 50030c65eba0cee6c4ba972610901876b1d8acd6
sha256: 0de785ffe4458c9b2c9b578f99f71e027e6890eb05029c37115f6a8ba16f85ad
sha512: 3577a1a890115d79bff37ff3c9e6024854fe0b1a113608ab0a9afdece8a058fef3715a5fa13ea6c366007909495b841bdebfe73104b9b28e5c8954cf9cd08c1c
ssdeep: 24576:u90GFYp/CicmBYgPGpvxJ7miq3oGzXGo24kKARf4m1czQ3ledQL:u0nhmzw3oGzXL24kKTm1p3led6
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Backdoor:Win32/Nosrawec.A also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
K7AntiVirus Spyware ( 002763f91 )
Elastic malicious (high confidence)
DrWeb Trojan.DownLoader11.8541
Cynet Malicious (score: 100)
ALYac Gen:Variant.Jacard.171444
Cylance Unsafe
Zillya Trojan.Buzus.Win32.65620
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Ransom:Win32/Blocker.f45a3f48
K7GW Spyware ( 002763f91 )
Cybereason malicious.b25da2
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Spy.Swisyn.GQ
APEX Malicious
Avast Win32:Injector-AGZ [Trj]
ClamAV Win.Trojan.Buzus-8832
Kaspersky Trojan-Ransom.Win32.Blocker.fdcx
BitDefender Gen:Variant.Jacard.171444
NANO-Antivirus Trojan.Win32.Buzus.dfqys
MicroWorld-eScan Gen:Variant.Jacard.171444
Tencent Malware.Win32.Gencirc.10b9b799
Ad-Aware Gen:Variant.Jacard.171444
Sophos Mal/Generic-S
Comodo TrojWare.Win32.Buzus.fgwo@4msreq
BitDefenderTheta AI:Packer.D0BE677E17
VIPRE Trojan.Win32.Generic.pak!cobra
McAfee-GW-Edition BehavesLike.Win32.Generic.tc
FireEye Generic.mg.ae25be1b25da22b7
Emsisoft Gen:Variant.Jacard.171444 (B)
SentinelOne Static AI – Suspicious PE
Avira DR/Delphi.Gen
eGambit Unsafe.AI_Score_89%
Microsoft Backdoor:Win32/Nosrawec.A
AegisLab Trojan.Win32.Buzus.lnay
GData Gen:Variant.Jacard.171444
TACHYON Ransom/W32.DP-Blocker.1321472
AhnLab-V3 Trojan/Win32.Buzus.C49199
McAfee GenericRXHO-GL!AE25BE1B25DA
MAX malware (ai score=88)
VBA32 BScope.Trojan-Dropper.Injector
Panda Trj/CI.A
Rising Ransom.Blocker!8.12A (CLOUD)
Yandex Trojan.Buzus!AxBogIkG/gs
Ikarus Trojan.Win32.SuspectCRC
Fortinet W32/Injector.MOU!tr
AVG Win32:Injector-AGZ [Trj]
Paloalto generic.ml
Qihoo-360 Win32/Ransom.Blocker.HgIASOYA

How to remove Backdoor:Win32/Nosrawec.A ransomware?

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 Backdoor:Win32/Nosrawec.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:

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If the guide doesn’t help you to remove Backdoor:Win32/Nosrawec.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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