Overview
overview
10Static
static
10BOB SILVER...10.exe
windows7-x64
10BOB SILVER...10.exe
windows10-2004-x64
10BOB SILVER...11.exe
windows7-x64
10BOB SILVER...11.exe
windows10-2004-x64
10BOB SILVER...12.exe
windows7-x64
10BOB SILVER...12.exe
windows10-2004-x64
10BOB SILVER...13.exe
windows7-x64
10BOB SILVER...13.exe
windows10-2004-x64
10BOB SILVER...14.exe
windows7-x64
10BOB SILVER...14.exe
windows10-2004-x64
10BOB SILVER...15.exe
windows7-x64
10BOB SILVER...15.exe
windows10-2004-x64
10BOB SILVER...16.exe
windows7-x64
10BOB SILVER...16.exe
windows10-2004-x64
10BOB SILVER...17.exe
windows7-x64
10BOB SILVER...17.exe
windows10-2004-x64
10BOB SILVER...18.exe
windows7-x64
10BOB SILVER...18.exe
windows10-2004-x64
10BOB SILVER...19.exe
windows7-x64
10BOB SILVER...19.exe
windows10-2004-x64
10BOB SILVER... 2.exe
windows7-x64
10BOB SILVER... 2.exe
windows10-2004-x64
10BOB SILVER...20.exe
windows7-x64
10BOB SILVER...20.exe
windows10-2004-x64
10BOB SILVER...21.exe
windows7-x64
10BOB SILVER...21.exe
windows10-2004-x64
10BOB SILVER...22.exe
windows7-x64
10BOB SILVER...22.exe
windows10-2004-x64
10BOB SILVER...23.exe
windows7-x64
10BOB SILVER...23.exe
windows10-2004-x64
10BOB SILVER...24.exe
windows7-x64
10BOB SILVER...24.exe
windows10-2004-x64
10Analysis
-
max time kernel
430s -
max time network
431s -
platform
windows10-2004_x64 -
resource
win10v2004-20250217-ja -
resource tags
arch:x64arch:x86image:win10v2004-20250217-jalocale:ja-jpos:windows10-2004-x64systemwindows -
submitted
08/03/2025, 20:02
Behavioral task
behavioral1
Sample
BOB SILVER CLIENTS GO BRRRRR/V 10.exe
Resource
win7-20240903-ja
Behavioral task
behavioral2
Sample
BOB SILVER CLIENTS GO BRRRRR/V 10.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral3
Sample
BOB SILVER CLIENTS GO BRRRRR/V 11.exe
Resource
win7-20241023-ja
Behavioral task
behavioral4
Sample
BOB SILVER CLIENTS GO BRRRRR/V 11.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral5
Sample
BOB SILVER CLIENTS GO BRRRRR/V 12.exe
Resource
win7-20240903-ja
Behavioral task
behavioral6
Sample
BOB SILVER CLIENTS GO BRRRRR/V 12.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral7
Sample
BOB SILVER CLIENTS GO BRRRRR/V 13.exe
Resource
win7-20250207-ja
Behavioral task
behavioral8
Sample
BOB SILVER CLIENTS GO BRRRRR/V 13.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral9
Sample
BOB SILVER CLIENTS GO BRRRRR/V 14.exe
Resource
win7-20240903-ja
Behavioral task
behavioral10
Sample
BOB SILVER CLIENTS GO BRRRRR/V 14.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral11
Sample
BOB SILVER CLIENTS GO BRRRRR/V 15.exe
Resource
win7-20240903-ja
Behavioral task
behavioral12
Sample
BOB SILVER CLIENTS GO BRRRRR/V 15.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral13
Sample
BOB SILVER CLIENTS GO BRRRRR/V 16.exe
Resource
win7-20240903-ja
Behavioral task
behavioral14
Sample
BOB SILVER CLIENTS GO BRRRRR/V 16.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral15
Sample
BOB SILVER CLIENTS GO BRRRRR/V 17.exe
Resource
win7-20240903-ja
Behavioral task
behavioral16
Sample
BOB SILVER CLIENTS GO BRRRRR/V 17.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral17
Sample
BOB SILVER CLIENTS GO BRRRRR/V 18.exe
Resource
win7-20241010-ja
Behavioral task
behavioral18
Sample
BOB SILVER CLIENTS GO BRRRRR/V 18.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral19
Sample
BOB SILVER CLIENTS GO BRRRRR/V 19.exe
Resource
win7-20241010-ja
Behavioral task
behavioral20
Sample
BOB SILVER CLIENTS GO BRRRRR/V 19.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral21
Sample
BOB SILVER CLIENTS GO BRRRRR/V 2.exe
Resource
win7-20241010-ja
Behavioral task
behavioral22
Sample
BOB SILVER CLIENTS GO BRRRRR/V 2.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral23
Sample
BOB SILVER CLIENTS GO BRRRRR/V 20.exe
Resource
win7-20241023-ja
Behavioral task
behavioral24
Sample
BOB SILVER CLIENTS GO BRRRRR/V 20.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral25
Sample
BOB SILVER CLIENTS GO BRRRRR/V 21.exe
Resource
win7-20241010-ja
Behavioral task
behavioral26
Sample
BOB SILVER CLIENTS GO BRRRRR/V 21.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral27
Sample
BOB SILVER CLIENTS GO BRRRRR/V 22.exe
Resource
win7-20240903-ja
Behavioral task
behavioral28
Sample
BOB SILVER CLIENTS GO BRRRRR/V 22.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral29
Sample
BOB SILVER CLIENTS GO BRRRRR/V 23.exe
Resource
win7-20241010-ja
Behavioral task
behavioral30
Sample
BOB SILVER CLIENTS GO BRRRRR/V 23.exe
Resource
win10v2004-20250217-ja
Behavioral task
behavioral31
Sample
BOB SILVER CLIENTS GO BRRRRR/V 24.exe
Resource
win7-20241010-ja
Behavioral task
behavioral32
Sample
BOB SILVER CLIENTS GO BRRRRR/V 24.exe
Resource
win10v2004-20250217-ja
General
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Target
BOB SILVER CLIENTS GO BRRRRR/V 21.exe
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Size
45KB
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MD5
1cf8d6e0acaa084d9b4201f11a1a04a8
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SHA1
7cc576ff7a096e14a6e83836bfd3cd29f7164392
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SHA256
c7c78f431c21c05d2963fb7635b73d969b7dada294252ef1d2b634b030a2375f
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SHA512
de6889cffba397b9a95b02d3271b14c9abbe543fb2a4415182cb24e9a3cf152bfb1ae5d3237eacac613f411fc278d120191f45c5cb1c4ca5135f393b57c0527a
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SSDEEP
768:iqzAMCV2799XtzcyyMjtjRULQD9PpnUz1QB6S9RVvr0/bE:iqzAM8qfzcMjGsD9K1QoyRVA/bE
Malware Config
Extracted
silverrat
1.0.0.0
if-eventually.gl.at.ply.gg:17094
lAxDBRhAFu
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certificate
MIIE4DCCAsigAwIBAgIQAKQYOfZd86J2BfNjhG4CWTANBgkqhkiG9w0BAQ0FADARMQ8wDQYDVQQDDAZTaWx2ZXIwIBcNMjIwODI2MTkwMTA4WhgPOTk5OTEyMzEyMzU5NTlaMBExDzANBgNVBAMMBlNpbHZlcjCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAPbpOWfhZTuOfEaqqImTTe5dNHAAry7/mf00DCoI4lPZfypsc1tYraxSPFeayGu09a3qdhkWKSVIgwnu2n4GLQNOCY9fh/1oyrX4Iir3BIkYeU7pKTWgjhUlAmFAUAaNr0ca23Ku2kN79jrDzRznOgE2DEW4p7OiM4Mb097ma9lzu7MyssHbY4VCteAhj9HZiplqBxaC1vXDmzxqG+gUZ1aLcyG7ssdkOjtWVBgT3gD/gOl7KchRzCFB1egDC/vD9WZCG35U3Ngi+IkTznoXR1R06cq4v0UnGjE37R2vcB21qb0ZYNiZJXZHv5i9+R7xoPeNoLda5PqnfGGbhPvNEdD56mdcOKlzGIuyemLkUo8texdpiBWKbtc3JZf5VsKxjJtHDK3xW6gDGI+PAirzGkFPmwcf8WgsblvzLg8OZpVxVs8rmKWoi6qIrf4CXnyl73J4lgzW+ir7PjANAQXwLNGdNnvdMeLeo/muGQPdeNpr6OczGGnkWA4qniHeL51/Gx0a8A+jP9zKiyu+qHcsP2IotgWDH/KlzJVr7IAum+DV92uV8poTDcUNcHaKvhHA65KmEtsvLbK6lFZcAMC0eWC0VgpW44T1/16rOaaky5mP6rTMc3nSyOl/lU/XgAgGGQPe22bRLWYzd3WVeEpI1WnHYXS+tL9IOe4kJP+pYsWDAgMBAAGjMjAwMB0GA1UdDgQWBBR32TJj2LeUx9L+RcSOvmFV6VJq6TAPBgNVHRMBAf8EBTADAQH/MA0GCSqGSIb3DQEBDQUAA4ICAQA+qucSOi7ov7Q1FmAjMf925KuvKuCNwJiu3Sqo3FDGVAD1fAwAi2FdyuXEO2VIUPZCkalFcBna5rqyrc6tcS4T0IL2TsYLrsuGir7PWP7CAcft1urYS1HpNpHxeH/nixwnQaQs/MuRmdm2TeCj6G21P5BTW55U5y9sMPSYwhbD2N7XLgnSQd5Y+80TR7FUiye/k3D37fI9PRhSQGbfYFRQQTmxj84dPTnY5CVgaY9d8fNiFZkyjaZdf+mibK0xQTf+xLVVj+toDNCkc1F462TdmFhCrHd4PoMo0yLDNv4SC6NLRq4haWDRtORw6gd5GYIoCQ3m3oQvNlNxXhhIjsOyxkxOrkCD0c+57PIc7EmKXieJa/XxnkcIVxO8dvTY/vijuz/VaZYl/lPu9ckuqgJ1wRvvsHl70Trv4Mn4X5uCIqRFFlK/mSOZbLIguGkDN3QIZABvej89vlZMhrVfZOG2oawe23FskHjv7thF/WzOXtWw6RUVC1V+hCwbuxFNUjZmmOTUwdXHnus7I2AuiG6Jz1+y9aYiXBcVTdSljxjHRRmiRaAnY94h58vN8NJ4hKL2GVCo6LxkpuplmcntJN0cKraKTPxSXcCRrqWxX9qoIbfvBcUU4vH1jPJCCLNCuDyD3lgQkpPVvq0EMU1a2HFGgMEQMjpYpb38rcadDhT5ag==
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decrypted_key
-|S.S.S|-
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discord
https://discord.com/api/webhooks/1335679503938355221/lGcOUDspps04wapqxq013W8uYGPSCcmnxl9Q1xnWdBn45Ul8QBT-Qs2mjsdVNXfOtTCe
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key
yy6zDjAUmbB09pKvo5Hhug==
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key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
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payload_url
https://g.top4top.io/p_2522c7w8u1.png
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reconnect_delay
4
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server_signature
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
Signatures
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Silverrat family
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Sets file to hidden 1 TTPs 2 IoCs
Modifies file attributes to stop it showing in Explorer etc.
pid Process 3608 attrib.exe 3044 attrib.exe -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-925314154-1797147466-1467878628-1000\Control Panel\International\Geo\Nation V 21.exe Key value queried \REGISTRY\USER\S-1-5-21-925314154-1797147466-1467878628-1000\Control Panel\International\Geo\Nation $77Runtime Broker.exe -
Executes dropped EXE 1 IoCs
pid Process 2988 $77Runtime Broker.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Templates\\WinTask\\$77Runtime Broker.exe\"" V 21.exe -
pid Process 1948 powershell.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
flow ioc 26 discord.com 25 discord.com -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Delays execution with timeout.exe 1 IoCs
pid Process 1712 timeout.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 1636 schtasks.exe 3884 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 30 IoCs
pid Process 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 4536 V 21.exe 1948 powershell.exe 1948 powershell.exe 1948 powershell.exe 2988 $77Runtime Broker.exe 2988 $77Runtime Broker.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
description pid Process Token: SeBackupPrivilege 2704 vssvc.exe Token: SeRestorePrivilege 2704 vssvc.exe Token: SeAuditPrivilege 2704 vssvc.exe Token: SeDebugPrivilege 4536 V 21.exe Token: SeDebugPrivilege 2988 $77Runtime Broker.exe Token: SeDebugPrivilege 1948 powershell.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2988 $77Runtime Broker.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 4536 wrote to memory of 3608 4536 V 21.exe 90 PID 4536 wrote to memory of 3608 4536 V 21.exe 90 PID 4536 wrote to memory of 3044 4536 V 21.exe 92 PID 4536 wrote to memory of 3044 4536 V 21.exe 92 PID 4536 wrote to memory of 2328 4536 V 21.exe 101 PID 4536 wrote to memory of 2328 4536 V 21.exe 101 PID 2328 wrote to memory of 1712 2328 cmd.exe 103 PID 2328 wrote to memory of 1712 2328 cmd.exe 103 PID 2328 wrote to memory of 2988 2328 cmd.exe 104 PID 2328 wrote to memory of 2988 2328 cmd.exe 104 PID 2988 wrote to memory of 348 2988 $77Runtime Broker.exe 106 PID 2988 wrote to memory of 348 2988 $77Runtime Broker.exe 106 PID 2988 wrote to memory of 1636 2988 $77Runtime Broker.exe 108 PID 2988 wrote to memory of 1636 2988 $77Runtime Broker.exe 108 PID 2988 wrote to memory of 3572 2988 $77Runtime Broker.exe 110 PID 2988 wrote to memory of 3572 2988 $77Runtime Broker.exe 110 PID 2988 wrote to memory of 1948 2988 $77Runtime Broker.exe 112 PID 2988 wrote to memory of 1948 2988 $77Runtime Broker.exe 112 PID 2988 wrote to memory of 3884 2988 $77Runtime Broker.exe 113 PID 2988 wrote to memory of 3884 2988 $77Runtime Broker.exe 113 -
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.
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Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
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Views/modifies file attributes 1 TTPs 2 IoCs
pid Process 3608 attrib.exe 3044 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\BOB SILVER CLIENTS GO BRRRRR\V 21.exe"C:\Users\Admin\AppData\Local\Temp\BOB SILVER CLIENTS GO BRRRRR\V 21.exe"1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4536 -
C:\Windows\System32\attrib.exe"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"2⤵
- Sets file to hidden
- Views/modifies file attributes
PID:3608
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C:\Windows\System32\attrib.exe"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"2⤵
- Sets file to hidden
- Views/modifies file attributes
PID:3044
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE7D0.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
PID:2328 -
C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
PID:1712
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C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2988 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks.exe" /query /TN $77Runtime Broker.exe4⤵PID:348
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C:\Windows\SYSTEM32\schtasks.exe"schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST4⤵
- Scheduled Task/Job: Scheduled Task
PID:1636
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C:\Windows\SYSTEM32\schtasks.exe"schtasks.exe" /query /TN $77Runtime Broker.exe4⤵PID:3572
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1948
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C:\Windows\System32\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "Runtime Broker_Task-HOURLY-01" /tr "%MyFile%" /st 00:004⤵
- Scheduled Task/Job: Scheduled Task
PID:3884
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2704
Network
MITRE ATT&CK Enterprise v15
Execution
Command and Scripting Interpreter
1PowerShell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
197B
MD5f960b5c868ef594bfead60002423deab
SHA18dd1cae3916de6daddd5220e7a5802c26966a8aa
SHA256cbb95288a0ba5af9fa4f713840ccab03016cc989374b55ad61d13f0d879a1819
SHA5122cc4cb7f608d307dd2f7238331b8499308706115feea17a7b1ef914cdb0c6bb64733a873341ae64c2c8bf7519f596fb79a06eb5cf85c8be543d9e69727161200
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Filesize
45KB
MD51cf8d6e0acaa084d9b4201f11a1a04a8
SHA17cc576ff7a096e14a6e83836bfd3cd29f7164392
SHA256c7c78f431c21c05d2963fb7635b73d969b7dada294252ef1d2b634b030a2375f
SHA512de6889cffba397b9a95b02d3271b14c9abbe543fb2a4415182cb24e9a3cf152bfb1ae5d3237eacac613f411fc278d120191f45c5cb1c4ca5135f393b57c0527a