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Merge pull request #1 from qtc-de/dev
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Merging dev to master [PowerUp]
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@qtc-de
qtc-de authored Apr 18, 2020
2 parents c7985c9 + f37a3d1 commit 866b43f
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172 changes: 86 additions & 86 deletions AntivirusBypass/Find-AVSignature.ps1
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Original file line number Diff line number Diff line change
Expand Up @@ -5,11 +5,11 @@ function Find-AVSignature
Locate tiny AV signatures.
PowerSploit Function: Find-AVSignature
Authors: Chris Campbell (@obscuresec) & Matt Graeber (@mattifestation)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
PowerSploit Function: Find-AVSignature
Authors: Chris Campbell (@obscuresec) & Matt Graeber (@mattifestation)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.DESCRIPTION
Expand Down Expand Up @@ -37,19 +37,19 @@ Optionally specifies the directory to write the binaries to.
.PARAMETER BufferLen
Specifies the length of the file read buffer . Defaults to 64KB.
Specifies the length of the file read buffer . Defaults to 64KB.
.PARAMETER Force
Forces the script to continue without confirmation.
Forces the script to continue without confirmation.
.EXAMPLE
PS C:\> Find-AVSignature -Startbyte 0 -Endbyte max -Interval 10000 -Path c:\test\exempt\nc.exe
PS C:\> Find-AVSignature -StartByte 10000 -EndByte 20000 -Interval 1000 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run2 -Verbose
PS C:\> Find-AVSignature -StartByte 16000 -EndByte 17000 -Interval 100 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run3 -Verbose
PS C:\> Find-AVSignature -StartByte 16800 -EndByte 16900 -Interval 10 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run4 -Verbose
PS C:\> Find-AVSignature -StartByte 16890 -EndByte 16900 -Interval 1 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run5 -Verbose
Find-AVSignature -Startbyte 0 -Endbyte max -Interval 10000 -Path c:\test\exempt\nc.exe
Find-AVSignature -StartByte 10000 -EndByte 20000 -Interval 1000 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run2 -Verbose
Find-AVSignature -StartByte 16000 -EndByte 17000 -Interval 100 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run3 -Verbose
Find-AVSignature -StartByte 16800 -EndByte 16900 -Interval 10 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run4 -Verbose
Find-AVSignature -StartByte 16890 -EndByte 16900 -Interval 1 -Path C:\test\exempt\nc.exe -OutPath c:\test\output\run5 -Verbose
.NOTES
Expand All @@ -63,10 +63,12 @@ http://www.exploit-monday.com/
http://heapoverflow.com/f0rums/project.php?issueid=34&filter=changes&page=2
#>

[CmdletBinding()] Param(
[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSShouldProcess', '')]
[CmdletBinding()]
Param(
[Parameter(Mandatory = $True)]
[ValidateRange(0,4294967295)]
[UInt32]
[UInt32]
$StartByte,

[Parameter(Mandatory = $True)]
Expand All @@ -75,112 +77,110 @@ http://heapoverflow.com/f0rums/project.php?issueid=34&filter=changes&page=2

[Parameter(Mandatory = $True)]
[ValidateRange(0,4294967295)]
[UInt32]
[UInt32]
$Interval,

[String]
[ValidateScript({Test-Path $_ })]
[ValidateScript({Test-Path $_ })]
$Path = ($pwd.path),

[String]
$OutPath = ($pwd),


[ValidateRange(1,2097152)]
[UInt32]
$BufferLen = 65536,


[ValidateRange(1,2097152)]
[UInt32]
$BufferLen = 65536,

[Switch] $Force

)

#test variables
if (!(Test-Path $Path)) {Throw "File path not found"}
$Response = $True
if (!(Test-Path $OutPath)) {
if ($Force -or ($Response = $psCmdlet.ShouldContinue("The `"$OutPath`" does not exist! Do you want to create the directory?",""))){new-item ($OutPath)-type directory}
}
}
if (!$Response) {Throw "Output path not found"}
if (!(Get-ChildItem $Path).Exists) {Throw "File not found"}
[Int32] $FileSize = (Get-ChildItem $Path).Length
if ($StartByte -gt ($FileSize - 1) -or $StartByte -lt 0) {Throw "StartByte range must be between 0 and $Filesize"}
[Int32] $MaximumByte = (($FileSize) - 1)
if ($EndByte -ceq "max") {$EndByte = $MaximumByte}
#Recast $Endbyte into an Integer so that it can be compared properly.
[Int32]$EndByte = $EndByte
#If $Endbyte is greater than the file Length, use $MaximumByte.

#Recast $Endbyte into an Integer so that it can be compared properly.
[Int32]$EndByte = $EndByte

#If $Endbyte is greater than the file Length, use $MaximumByte.
if ($EndByte -gt $FileSize) {$EndByte = $MaximumByte}

#If $Endbyte is less than the $StartByte, use 1 Interval past $StartByte.
if ($EndByte -lt $StartByte) {$EndByte = $StartByte + $Interval}

Write-Verbose "StartByte: $StartByte"
Write-Verbose "EndByte: $EndByte"

#If $Endbyte is less than the $StartByte, use 1 Interval past $StartByte.
if ($EndByte -lt $StartByte) {$EndByte = $StartByte + $Interval}

Write-Verbose "StartByte: $StartByte"
Write-Verbose "EndByte: $EndByte"

#find the filename for the output name
[String] $FileName = (Split-Path $Path -leaf).Split('.')[0]

#Calculate the number of binaries
[Int32] $ResultNumber = [Math]::Floor(($EndByte - $StartByte) / $Interval)
if (((($EndByte - $StartByte) % $Interval)) -gt 0) {$ResultNumber = ($ResultNumber + 1)}

#Prompt user to verify parameters to avoid writing binaries to the wrong directory
$Response = $True
if ( $Force -or ( $Response = $psCmdlet.ShouldContinue("This script will result in $ResultNumber binaries being written to `"$OutPath`"!",
"Do you want to continue?"))){}
if (!$Response) {Return}
Write-Verbose "This script will now write $ResultNumber binaries to `"$OutPath`"."

Write-Verbose "This script will now write $ResultNumber binaries to `"$OutPath`"."
[Int32] $Number = [Math]::Floor($Endbyte/$Interval)

#Create a Read Buffer and Stream.
#Note: The Filestream class takes advantage of internal .NET Buffering. We set the default internal buffer to 64KB per http://research.microsoft.com/pubs/64538/tr-2004-136.doc.
[Byte[]] $ReadBuffer=New-Object byte[] $BufferLen
[System.IO.FileStream] $ReadStream = New-Object System.IO.FileStream($Path, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read, [System.IO.FileShare]::Read, $BufferLen)

#write out the calculated number of binaries
[Int32] $i = 0
for ($i -eq 0; $i -lt $ResultNumber + 1 ; $i++)
{
# If this is the Final Binary, use $EndBytes, Otherwise calculate based on the Interval
if ($i -eq $ResultNumber) {[Int32]$SplitByte = $EndByte}
else {[Int32] $SplitByte = (($StartByte) + (($Interval) * ($i)))}

Write-Verbose "Byte 0 -> $($SplitByte)"

#Reset ReadStream to beginning of file
$ReadStream.Seek(0, [System.IO.SeekOrigin]::Begin) | Out-Null

#Build a new FileStream for Writing
[String] $outfile = Join-Path $OutPath "$($FileName)_$($SplitByte).bin"
[System.IO.FileStream] $WriteStream = New-Object System.IO.FileStream($outfile, [System.IO.FileMode]::Create, [System.IO.FileAccess]::Write, [System.IO.FileShare]::None, $BufferLen)

[Int32] $BytesLeft = $SplitByte
Write-Verbose "$($WriteStream.name)"

#Write Buffer Length to the Writing Stream until the bytes left is smaller than the buffer
while ($BytesLeft -gt $BufferLen){
[Int32]$count = $ReadStream.Read($ReadBuffer, 0, $BufferLen)
$WriteStream.Write($ReadBuffer, 0, $count)
$BytesLeft = $BytesLeft - $count
}

#Write the remaining bytes to the file
do {
[Int32]$count = $ReadStream.Read($ReadBuffer, 0, $BytesLeft)
$WriteStream.Write($ReadBuffer, 0, $count)
$BytesLeft = $BytesLeft - $count
}
until ($BytesLeft -eq 0)
$WriteStream.Close()
$WriteStream.Dispose()

#Create a Read Buffer and Stream.
#Note: The Filestream class takes advantage of internal .NET Buffering. We set the default internal buffer to 64KB per http://research.microsoft.com/pubs/64538/tr-2004-136.doc.
[Byte[]] $ReadBuffer=New-Object byte[] $BufferLen
[System.IO.FileStream] $ReadStream = New-Object System.IO.FileStream($Path, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read, [System.IO.FileShare]::Read, $BufferLen)

#write out the calculated number of binaries
[Int32] $i = 0
for ($i -eq 0; $i -lt $ResultNumber + 1 ; $i++)
{
# If this is the Final Binary, use $EndBytes, Otherwise calculate based on the Interval
if ($i -eq $ResultNumber) {[Int32]$SplitByte = $EndByte}
else {[Int32] $SplitByte = (($StartByte) + (($Interval) * ($i)))}

Write-Verbose "Byte 0 -> $($SplitByte)"

#Reset ReadStream to beginning of file
$ReadStream.Seek(0, [System.IO.SeekOrigin]::Begin) | Out-Null

#Build a new FileStream for Writing
[String] $outfile = Join-Path $OutPath "$($FileName)_$($SplitByte).bin"
[System.IO.FileStream] $WriteStream = New-Object System.IO.FileStream($outfile, [System.IO.FileMode]::Create, [System.IO.FileAccess]::Write, [System.IO.FileShare]::None, $BufferLen)

[Int32] $BytesLeft = $SplitByte
Write-Verbose "$($WriteStream.name)"

#Write Buffer Length to the Writing Stream until the bytes left is smaller than the buffer
while ($BytesLeft -gt $BufferLen){
[Int32]$count = $ReadStream.Read($ReadBuffer, 0, $BufferLen)
$WriteStream.Write($ReadBuffer, 0, $count)
$BytesLeft = $BytesLeft - $count
}

#Write the remaining bytes to the file
do {
[Int32]$count = $ReadStream.Read($ReadBuffer, 0, $BytesLeft)
$WriteStream.Write($ReadBuffer, 0, $count)
$BytesLeft = $BytesLeft - $count
}
Write-Verbose "Files written to disk. Flushing memory."
$ReadStream.Dispose()

#During testing using large binaries, memory usage was excessive so lets fix that
[System.GC]::Collect()
Write-Verbose "Completed!"
until ($BytesLeft -eq 0)
$WriteStream.Close()
$WriteStream.Dispose()
}
Write-Verbose "Files written to disk. Flushing memory."
$ReadStream.Dispose()

#During testing using large binaries, memory usage was excessive so lets fix that
[System.GC]::Collect()
Write-Verbose "Completed!"
}
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