What is Worm:Win32/Prolaco.U infection?

In this article you will find regarding the interpretation of Worm:Win32/Prolaco.U and also its adverse effect on your computer. Such ransomware are a type of malware that is clarified by on the internet scams to require paying the ransom money by a sufferer.

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Most of the situations, Worm:Win32/Prolaco.U virus will instruct its sufferers to initiate funds move for the objective of counteracting the amendments that the Trojan infection has actually presented to the sufferer’s tool.

Worm:Win32/Prolaco.U Summary

These alterations 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.
  • Expresses interest in specific running processes;
  • 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.

  • 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.
  • Unconventionial language used in binary resources: Korean;
  • 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;
  • Attempts to stop active services;
  • 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 identify installed AV products by installation directory;
  • Attempts to identify installed AV products by registry key;
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Operates on local firewall’s policies and settings;
  • Attempts to disable UAC.

    User Account Control or just UAC is a part of the Windows security system which prevents apps from making unwanted changes on PC.

    UAC includes several technologies 1:

    • File and egistry Virtualization;
    • Same-desktop Elevation;
    • Filtered Token;
    • User Interface Privilege Isolation;
    • Protected Mode Internet Explorer;
    • Installer Detection;
  • Harvests information related to installed mail clients;
  • Attempts to modify or disable Security Center warnings;
  • Ciphering the files situated on the target’s hard disk — so the victim can no longer use the information;
  • Preventing routine access to the sufferer’s workstation;


One of the most typical networks whereby Worm:Win32/Prolaco.U Ransomware are infused are:

  • By means of phishing e-mails;
  • As a consequence of customer ending up on a resource that holds a destructive software;

As quickly as the Trojan is effectively injected, it will certainly either cipher the data on the victim’s PC or avoid the tool from working in a proper manner – while additionally placing a ransom money note that discusses the need for the targets to effect the settlement for the objective of decrypting the documents or restoring the documents system back to the first problem. In most circumstances, the ransom money note will show up when the customer reboots the COMPUTER after the system has currently been damaged.

Worm:Win32/Prolaco.U distribution channels.

In numerous edges of the world, Worm:Win32/Prolaco.U expands by leaps as well as bounds. Nevertheless, the ransom money notes as well as tricks of obtaining the ransom quantity may differ depending upon specific local (regional) setups. The ransom notes and tricks of extorting the ransom amount might differ depending on particular regional (local) settings.

Ransomware injection

For example:

    Faulty alerts concerning unlicensed software application.

    In specific areas, the Trojans usually wrongfully report having detected some unlicensed applications allowed on the sufferer’s device. The sharp after that requires the individual to pay the ransom money.

    Faulty declarations regarding prohibited content.

    In countries where software program piracy is less popular, this technique is not as efficient for the cyber frauds. Conversely, the Worm:Win32/Prolaco.U popup alert may falsely assert to be deriving from a law enforcement establishment and will report having situated child porn or various other unlawful information on the tool.

    Worm:Win32/Prolaco.U popup alert may incorrectly declare to be deriving from a regulation enforcement institution and also will certainly report having located child pornography or other unlawful data on the device. The alert will in a similar way contain a requirement for the customer to pay the ransom.

Technical details

File Info:

crc32: ADD16D48
md5: 43fe5b1cfdfb1bf771aa885bd425502c
name: 43FE5B1CFDFB1BF771AA885BD425502C.mlw
sha1: 744ca87e4113737dc9f124e65c0d63d8324caf8b
sha256: 7d7734a8c1c608ec62301529193d2e6774987c6471c160168d4349f36a1e30d6
sha512: 439f579cf19f89c8da317575c656e719e7ad076bc16cc076d1c07b41383422d950a03f4e3430ffb23db54e546f2e0dd1dfa777889ec3d5614c7c9ba4631051d4
ssdeep: 12288:pJ9r582Uza0ewFLWCR7ZsLxH8cS81VCC0kODYdp/PfiON9p62v3zGF80LTZSmUvo:pvavFS/j1VrOcGOYe3zGF3XpTzdd
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: (C)Microsoft Corporation. All rights reserved.
InternalName: Wextract
FileVersion: 6.00.2900.5512 (xpsp.080413-2105)
CompanyName: Microsoft Corporation
ProductName: Microsoft(R) Windows(R) Operating System
ProductVersion: 6.00.2900.5512
FileDescription: Win32 Cabinet Self-Extractor
OriginalFilename: WEXTRACT.EXE
Translation: 0x0412 0x04b0

Worm:Win32/Prolaco.U also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Trojan ( 0055e3991 )
Elastic malicious (high confidence)
DrWeb Win32.HLLW.Autoruner.47592
Cynet Malicious (score: 85)
ALYac Gen:Heur.Mint.Zard.10
Cylance Unsafe
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_60% (D)
Alibaba Worm:Win32/Blocker.fcd1bc9e
K7GW Trojan ( 0055e3991 )
Cybereason malicious.cfdfb1
Cyren W32/Risk.BZVO-5878
Symantec W32.Ackantta@mm
ESET-NOD32 a variant of Win32/Merond.AC
APEX Malicious
TotalDefense Win32/Fruspam!cab
Avast Win32:Malware-gen
ClamAV Win.Malware.Zard-6950572-0
Kaspersky Trojan-Ransom.Win32.Blocker.fqge
BitDefender Gen:Heur.Mint.Zard.10
NANO-Antivirus Trojan.Win32.Typic.btwih
MicroWorld-eScan Gen:Heur.Mint.Zard.10
Tencent Win32.Trojan.Blocker.Peqg
Ad-Aware Gen:Heur.Mint.Zard.10
Sophos ML/PE-A
Comodo Malware@#9x0b435apr0q
BitDefenderTheta AI:Packer.2B05A29E1F
VIPRE Worm.Win32.Prolaco (v)
FireEye Generic.mg.43fe5b1cfdfb1bf7
Emsisoft Gen:Heur.Mint.Zard.10 (B)
SentinelOne Static AI – Suspicious SFX
Jiangmin TrojanDropper.Typic.ph
Webroot W32.Injector.Gen
Avira TR/Dropper.Gen
eGambit Unsafe.AI_Score_70%
Microsoft Worm:Win32/Prolaco.U
GData Win32.Trojan.Prolaco.A
TACHYON Backdoor/W32.Hupigon.924672.W
McAfee Artemis!43FE5B1CFDFB
MAX malware (ai score=100)
VBA32 BScope.Trojan.Wacatac
Malwarebytes Malware.AI.4290381805
Panda Trj/CI.A
TrendMicro-HouseCall WORM_PROLACO.SMA
Rising Ransom.Blocker!8.12A (CLOUD)
Yandex Trojan.GenAsa!VCW6ua3WfJ8
Ikarus P2P-Worm.Win32.BlackControl
Fortinet W32/Merond.O!worm
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Ransom.Blocker.HgIASOQA

How to remove Worm:Win32/Prolaco.U 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 GridinSoft2

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft3.

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/Prolaco.U 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 Worm:Win32/Prolaco.U you can always ask me in the comments for getting help.

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  1. Microsoft Ignite: How to disable User Account Control (UAC) on Windows Server
  2. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  3. 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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