Created
June 8, 2022 18:16
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$enc = [System.Text.Encoding]::ASCII | |
function encr { | |
param( | |
[Byte[]]$data, | |
[Byte[]]$key | |
) | |
[Byte[]]$buffer = New-Object Byte[] $data.Length | |
$data.CopyTo($buffer, 0) | |
[Byte[]]$s = New-Object Byte[] 256; | |
[Byte[]]$k = New-Object Byte[] 256; | |
for ($i = 0; $i -lt 256; $i++) | |
{ | |
$s[$i] = [Byte]$i; | |
$k[$i] = $key[$i % $key.Length]; | |
} | |
$j = 0; | |
for ($i = 0; $i -lt 256; $i++) | |
{ | |
$j = ($j + $s[$i] + $k[$i]) % 256; | |
$temp = $s[$i]; | |
$s[$i] = $s[$j]; | |
$s[$j] = $temp; | |
} | |
$i = $j = 0; | |
for ($x = 0; $x -lt $buffer.Length; $x++) | |
{ | |
$i = ($i + 1) % 256; | |
$j = ($j + $s[$i]) % 256; | |
$temp = $s[$i]; | |
$s[$i] = $s[$j]; | |
$s[$j] = $temp; | |
[int]$t = ($s[$i] + $s[$j]) % 256; | |
$buffer[$x] = $buffer[$x] -bxor $s[$t]; | |
} | |
return $buffer | |
} | |
function HexToBin { | |
param( | |
[Parameter( | |
Position=0, | |
Mandatory=$true, | |
ValueFromPipeline=$true) | |
] | |
[string]$s) | |
$return = @() | |
for ($i = 0; $i -lt $s.Length ; $i += 2) | |
{ | |
$return += [Byte]::Parse($s.Substring($i, 2), [System.Globalization.NumberStyles]::HexNumber) | |
} | |
Write-Output $return | |
} | |
[Byte[]]$key = $enc.GetBytes("Q0mmpr4B5rvZi3pS"); | |
$encrypted1 = "F844A6035CF27CC4C90DFEAF579398BE6F7D5ED10270BD12A661DAD04191347559B82ED546015B07317000D8909939A4DA7953AED8B83C0FEE4EB6E120372F536BC5DC39" | |
$encrypted2 = "CC19F66A5F3B2E36C9B810FE7CC4D9CE342E8E00138A4F7F5CDD9EED9E09299DD7C6933CF4734E12A906FD9CE1CA57D445DB9CABF850529F5845083F34BA1" | |
$encrypted3 = "C08114AA67EB979D36DC3EFA0F62086B947F672BD8F966305A98EF93AA39076C3726B0EDEBFA10811A15F1CF1BEFC78AFC5E08AD8CACDB323F44B4D" | |
$encrypted4 = "D814EB4E244A153AF8FAA1121A5CCFD0FEAC8DD96A9B31CCF6C3E3E03C1E93626DF5B3E0B141467116CC08F92147F7A0BE0D95B0172A7F34922D6C236BC7DE54D8ACBFA70D1" | |
$encrypted5 = "84AB553E67C743BE696A0AC80C16E2B354C2AE7918EE08A0A3887875C83E44ACA7393F1C579EE41BCB7D336CAF8695266839907F47775F89C1F170562A6B0A01C0F3BC4CB" | |
$encrypted = "$($encrypted1)$($encrypted2)$($encrypted3)$($encrypted4)$($encrypted5)" | |
[Byte[]]$data = HexToBin $encrypted | |
$DecryptedBytes = encr $data $key | |
$DecryptedString = $enc.GetString($DecryptedBytes) | |
$DecryptedString | |
#HTB{g0ld3n_F4ng_1s_n0t_st34lthy_3n0ugh} |
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