Lanczak Enterprises LLC

import tkinter as tk
from tkinter import filedialog, simpledialog, messagebox
import hashlib

def calculate_sha256(file_path):
    sha256_hash = hashlib.sha256()
    with open(file_path, "rb") as f:
        # Read and update hash string value in blocks of 4K
        for byte_block in iter(lambda: f.read(4096), b""):
            sha256_hash.update(byte_block)
    return sha256_hash.hexdigest()

def verify_checksum():
    file_path = filedialog.askopenfilename(title="Select the file to check the SHA256 checksum on", filetypes=[("All Files", "*.*")])

    if file_path:
        # Prompt user for SHA256 checksum
        entered_checksum = simpledialog.askstring("Checksum Verification", "Enter SHA256 checksum:")

        # Calculate the SHA256 checksum of the selected file
        file_checksum = calculate_sha256(file_path)

        # Compare entered checksum with calculated checksum
        if entered_checksum == file_checksum:
            messagebox.showinfo("Verification Result", "Checksum verification successful. The file has not been tampered with.")
        else:
            messagebox.showerror("Verification Result", "Checksum verification failed. The file may have been tampered with.")
    else:
        messagebox.showinfo("File Selection", "File selection cancelled by the user.")

# Create the main application window
root = tk.Tk()
root.withdraw()  # Hide the main window

# Call the verify_checksum function
verify_checksum()

# Start the main loop
root.mainloop()

Don’t scan codes from strangers (if you receive a QR code from an unsolicited message — text, social media, email, or physical — be skeptical and don’t use it!) If it’s a physical QR code — take a look to see if it was tampered with.

https://www.bleepingcomputer.com/news/security/ransomware-gang-files-sec-complaint-over-victims-undisclosed-breach/

# List of remote computer names
$computers = @("Server01", "Server02", "Server03", "Server04", "Server05", "Server06")
 
# Name of the service you want to check
$serviceName = "PrintSpooler"
 
# Loop through the list of remote computers and check the service status
foreach ($computer in $computers) {
    try {
        $serviceStatus = Get-Service -ComputerName $computer -Name $serviceName
        Write-Host "Service $serviceName on $computer is $($serviceStatus.Status)"
    } catch {
        Write-Host "Failed to get service status on" $computer
    }
}

# List of computer names or IP addresses.
# Note: Un-comment the preferred source 
#$computers = @("ServerA", "ServerB")
#$computers = Get-Content -Path "C:\TEMP\AllNodes.txt
 
foreach ($computer in $computers) {
    Write-Host "Users logged on to"$computer":"
    try {
        $loggedOnUsers = query user /server:$computer 2>&1 | ForEach-Object {
            # Split the line into individual pieces of information
            $userDetails = $_ -split '\s+'
            if ($userDetails[1] -ne "USERNAME" -and $userDetails[1] -ne "No") {
                # Filter out header and empty lines
                $userDetails[1]
            }
        }
       
        if ($loggedOnUsers -eq $null) {
            Write-Host "No users are currently logged on to $computer."
        } else {
            $loggedOnUsers
        }
    } catch {
        Write-Host "Error connecting to "$computer": $_"
    }
    Write-Host
}
 

# Define list of nodes to check
$servers = Get-Content -Path "C:\TEMP\AllNodes.txt" 
 
# Query activation status
foreach ($server in $servers) {
    $activation = Get-WmiObject -Query "SELECT * FROM SoftwareLicensingProduct WHERE (PartialProductKey IS NOT NULL)" -ComputerName $server
   
    if ($activation) {
        Write-Host "Server $server is activated."
    } else {
        Write-Host "Server $server is not activated."
    }
}

# This script can be used with SolarWinds SAM to monitor for rate of growth for a specific file

# Globally used variables
$FileToMonitor = "C:\Temp\FileToMonitor.txt"
$CacheFile = "C:\Temp\Cache.txt"
 
# Get Current file size
$FileSize = Get-Item -Path $FileToMonitor | Select-Object -ExpandProperty Length
 
# Write current file size to a cache file
Add-Content $CacheFile $FileSize
 
# Calculate the percent difference and round it to a whole number
$oldValue = Get-Content $CacheFile -First 1
$newValue = Get-Content $CacheFile -Last 1
$percentageDifference = (($newValue - $oldValue) / $oldValue) * 100
$percentageDifference = ([Math]::Round($percentageDifference, 0))
 
# Write to the host for SolarWinds to ingest
Write-Host "Message: File growth was calculated as $percentageDifference%"
Write-Host "Statistic:" $percentageDifference
 
# Keep the cache file clean/small (litterally just keeping 2-lines)
(Get-Content "$CacheFile" -Tail 2) | Set-Content "$CacheFile"
 
# Exit Session
Exit 0;

# Specify the path to the existing text file
$filePath = "C:\TEMP\Rubbish.txt"

# Calculate the size of 2MB in bytes
$additionalDataSize = 2 * 1024 * 1024

# Generate 2MB of random data
$randomText = [byte[]]::new($additionalDataSize)

$random = New-Object System.Random
$random.NextBytes($randomText)

# Open the file in append mode and write the random data
$fileStream = [System.IO.File]::Open($filePath, [System.IO.FileMode]::Append)
$fileStream.Write($randomText, 0, $randomText.Length)
$fileStream.Close()

Write-Host "Added 2MB of random data to $filePath"

Encode

certutil -encode "C:\Wherever\Whatever.whatever" "C:\Wherever.whatever"

Decode

certutil -decode "C:\Wherever\Whatever.whatver" "C:\Wherever\Whatever.Whatever"

From a Microsoft OS command line interface, enter the following:

for /l %i in (1,1,254) do @ping -n 1 -w 100 <first three octets of host network>.%i

Also useful in ping sweep scenerios:

arp -a