Analysis
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max time kernel
120s -
max time network
126s -
platform
windows7_x64 -
resource
win7-20241010-en -
resource tags
arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system -
submitted
18/03/2025, 21:28
Behavioral task
behavioral1
Sample
FREEROBUX.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
FREEROBUX.exe
Resource
win10v2004-20250314-en
General
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Target
FREEROBUX.exe
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Size
1.6MB
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MD5
4c0e5c4aa3eb66907cf32b7bd869dd8f
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SHA1
2f97ad58991c727a897f4613e00d6b24a3300a85
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SHA256
31aa2f05a7cd0b81002336c0f0b5397415b9ee70250862f91215e2bc4bb571d8
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SHA512
56ddad28ad605fe95b4b8f1ea00a130db1e07e082391ce2a1c8336d4ee6f177d1d9806b8a5e200ddc2bf7319f9ba44f194cb48f52f3e9f2c689e7d9b502eea51
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SSDEEP
24576:T1I8mdFc9nPV3EouDm6BkNEnzC5CW78UV:OFc3C37zCyG
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\read_it.txt
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 3 IoCs
resource yara_rule behavioral1/memory/2004-1-0x0000000000230000-0x00000000003CE000-memory.dmp family_chaos behavioral1/files/0x0030000000018b71-6.dat family_chaos behavioral1/memory/3040-9-0x00000000010A0000-0x000000000123E000-memory.dmp family_chaos -
Chaos family
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Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
pid Process 2856 bcdedit.exe 2524 bcdedit.exe -
pid Process 2232 wbadmin.exe -
Disables Task Manager via registry modification
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Drops startup file 2 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 3040 svchost.exe -
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\UpdateTask = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe" svchost.exe -
Drops desktop.ini file(s) 64 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\5O2ZS8DL\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\BBWU148F\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Tablet PC\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\ADWO43R6\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Games\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\History.IE5\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3692679935-4019334568-335155002-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\1U7Y9BT8\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\4KNYJNXZ\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\4TDQSVWU\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Public\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\SEGJVAZC\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Ringtones\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\fmu50cj1u.jpg" svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2964 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1668 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2004 FREEROBUX.exe 3040 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2004 FREEROBUX.exe 2004 FREEROBUX.exe 2004 FREEROBUX.exe 3040 svchost.exe 3040 svchost.exe 3040 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2004 FREEROBUX.exe Token: SeDebugPrivilege 3040 svchost.exe Token: SeBackupPrivilege 2936 vssvc.exe Token: SeRestorePrivilege 2936 vssvc.exe Token: SeAuditPrivilege 2936 vssvc.exe Token: SeIncreaseQuotaPrivilege 1828 WMIC.exe Token: SeSecurityPrivilege 1828 WMIC.exe Token: SeTakeOwnershipPrivilege 1828 WMIC.exe Token: SeLoadDriverPrivilege 1828 WMIC.exe Token: SeSystemProfilePrivilege 1828 WMIC.exe Token: SeSystemtimePrivilege 1828 WMIC.exe Token: SeProfSingleProcessPrivilege 1828 WMIC.exe Token: SeIncBasePriorityPrivilege 1828 WMIC.exe Token: SeCreatePagefilePrivilege 1828 WMIC.exe Token: SeBackupPrivilege 1828 WMIC.exe Token: SeRestorePrivilege 1828 WMIC.exe Token: SeShutdownPrivilege 1828 WMIC.exe Token: SeDebugPrivilege 1828 WMIC.exe Token: SeSystemEnvironmentPrivilege 1828 WMIC.exe Token: SeRemoteShutdownPrivilege 1828 WMIC.exe Token: SeUndockPrivilege 1828 WMIC.exe Token: SeManageVolumePrivilege 1828 WMIC.exe Token: 33 1828 WMIC.exe Token: 34 1828 WMIC.exe Token: 35 1828 WMIC.exe Token: SeIncreaseQuotaPrivilege 1828 WMIC.exe Token: SeSecurityPrivilege 1828 WMIC.exe Token: SeTakeOwnershipPrivilege 1828 WMIC.exe Token: SeLoadDriverPrivilege 1828 WMIC.exe Token: SeSystemProfilePrivilege 1828 WMIC.exe Token: SeSystemtimePrivilege 1828 WMIC.exe Token: SeProfSingleProcessPrivilege 1828 WMIC.exe Token: SeIncBasePriorityPrivilege 1828 WMIC.exe Token: SeCreatePagefilePrivilege 1828 WMIC.exe Token: SeBackupPrivilege 1828 WMIC.exe Token: SeRestorePrivilege 1828 WMIC.exe Token: SeShutdownPrivilege 1828 WMIC.exe Token: SeDebugPrivilege 1828 WMIC.exe Token: SeSystemEnvironmentPrivilege 1828 WMIC.exe Token: SeRemoteShutdownPrivilege 1828 WMIC.exe Token: SeUndockPrivilege 1828 WMIC.exe Token: SeManageVolumePrivilege 1828 WMIC.exe Token: 33 1828 WMIC.exe Token: 34 1828 WMIC.exe Token: 35 1828 WMIC.exe Token: SeBackupPrivilege 2056 wbengine.exe Token: SeRestorePrivilege 2056 wbengine.exe Token: SeSecurityPrivilege 2056 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2004 wrote to memory of 3040 2004 FREEROBUX.exe 30 PID 2004 wrote to memory of 3040 2004 FREEROBUX.exe 30 PID 2004 wrote to memory of 3040 2004 FREEROBUX.exe 30 PID 3040 wrote to memory of 2924 3040 svchost.exe 31 PID 3040 wrote to memory of 2924 3040 svchost.exe 31 PID 3040 wrote to memory of 2924 3040 svchost.exe 31 PID 2924 wrote to memory of 2964 2924 cmd.exe 33 PID 2924 wrote to memory of 2964 2924 cmd.exe 33 PID 2924 wrote to memory of 2964 2924 cmd.exe 33 PID 2924 wrote to memory of 1828 2924 cmd.exe 36 PID 2924 wrote to memory of 1828 2924 cmd.exe 36 PID 2924 wrote to memory of 1828 2924 cmd.exe 36 PID 3040 wrote to memory of 2244 3040 svchost.exe 38 PID 3040 wrote to memory of 2244 3040 svchost.exe 38 PID 3040 wrote to memory of 2244 3040 svchost.exe 38 PID 2244 wrote to memory of 2856 2244 cmd.exe 40 PID 2244 wrote to memory of 2856 2244 cmd.exe 40 PID 2244 wrote to memory of 2856 2244 cmd.exe 40 PID 2244 wrote to memory of 2524 2244 cmd.exe 41 PID 2244 wrote to memory of 2524 2244 cmd.exe 41 PID 2244 wrote to memory of 2524 2244 cmd.exe 41 PID 3040 wrote to memory of 2504 3040 svchost.exe 42 PID 3040 wrote to memory of 2504 3040 svchost.exe 42 PID 3040 wrote to memory of 2504 3040 svchost.exe 42 PID 2504 wrote to memory of 2232 2504 cmd.exe 44 PID 2504 wrote to memory of 2232 2504 cmd.exe 44 PID 2504 wrote to memory of 2232 2504 cmd.exe 44 PID 3040 wrote to memory of 1668 3040 svchost.exe 49 PID 3040 wrote to memory of 1668 3040 svchost.exe 49 PID 3040 wrote to memory of 1668 3040 svchost.exe 49 -
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.
Processes
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C:\Users\Admin\AppData\Local\Temp\FREEROBUX.exe"C:\Users\Admin\AppData\Local\Temp\FREEROBUX.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2004 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3040 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2924 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2964
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1828
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no3⤵
- Suspicious use of WriteProcessMemory
PID:2244 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2856
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2524
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2504 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2232
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt3⤵
- Opens file in notepad (likely ransom note)
PID:1668
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2936
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2056
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:884
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:3008
Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Defense Evasion
Direct Volume Access
1Indicator Removal
3File Deletion
3Modify Registry
2Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
582B
MD5ed5cc52876db869de48a4783069c2a5e
SHA1a9d51ceaeff715ace430f9462ab2ee4e7f33e70e
SHA25645726f2f29967ef016f8d556fb6468a577307d67388cc4530295a9ca10fdfa36
SHA5121745aefb9b4db4cdd7c08ee3a7d133db08f35a336fd18b598211519b481ef25ac84a3e8a3da3db06caef9f531288d1cf0ca8d4b2560637945e7953e8b45421f5
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Filesize
1.6MB
MD54c0e5c4aa3eb66907cf32b7bd869dd8f
SHA12f97ad58991c727a897f4613e00d6b24a3300a85
SHA25631aa2f05a7cd0b81002336c0f0b5397415b9ee70250862f91215e2bc4bb571d8
SHA51256ddad28ad605fe95b4b8f1ea00a130db1e07e082391ce2a1c8336d4ee6f177d1d9806b8a5e200ddc2bf7319f9ba44f194cb48f52f3e9f2c689e7d9b502eea51
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0