Analysis
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max time kernel
121s -
max time network
124s -
platform
windows7_x64 -
resource
win7-20240708-en -
resource tags
arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system -
submitted
12-08-2024 21:38
Behavioral task
behavioral1
Sample
SolaraBootstrapper.exe
Resource
win7-20240708-en
Behavioral task
behavioral2
Sample
SolaraBootstrapper.exe
Resource
win10v2004-20240802-en
General
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Target
SolaraBootstrapper.exe
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Size
3.2MB
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MD5
a9f17939e061e0511410aaf77087b02d
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SHA1
554dc5ce2b0af194364833ea517a4089794fe97e
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SHA256
19b98f9d5364599c870fa967e544634a635c358b3ed7208d5fc563c95a26e7e2
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SHA512
4320694375b559ddcb6722d445e9509076f384271aa4445116f5b72a824a33df0aad1d29354b046964050a9676ce6e04e806046870064fe9b70512d99896adc4
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SSDEEP
24576:7u+wImf9OPXCQYpd0naDrvqjo44E9gzfyYVGSyF+ZjyFJX/oekGTP/JCF1eQ8uW:TO9OPXCYPD4mgRVIJ/vNQ8
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad\read_it.txt
chaos
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/1688-1-0x00000000010F0000-0x0000000001426000-memory.dmp family_chaos behavioral1/files/0x00090000000175cc-5.dat family_chaos behavioral1/memory/2472-7-0x0000000000B20000-0x0000000000E56000-memory.dmp family_chaos -
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 2172 bcdedit.exe 1880 bcdedit.exe -
Renames multiple (214) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 1172 wbadmin.exe -
Disables Task Manager via registry modification
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Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url svchost.exe 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 2472 svchost.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Drops desktop.ini file(s) 64 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\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 F:\$RECYCLE.BIN\S-1-5-21-2958949473-3205530200-1453100116-1000\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\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\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\All Users\Microsoft\Windows\Ringtones\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\Accessories\Tablet PC\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\Public\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\0JY8H21Z\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\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\Admin\Videos\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\C906A748\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\M720ATCO\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\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\Public\Recorded TV\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\ZO1X14N3\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\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\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\Default\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\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\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\V8SGIH7I\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\Roaming\Microsoft\Windows\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\MN6S8FGK\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\Favorites\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\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\N7ZQRMOO\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\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\Sample Music\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\Sample Videos\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\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\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\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2958949473-3205530200-1453100116-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Pictures\\My Wallpaper.jpg" svchost.exe Set value (str) \REGISTRY\USER\S-1-5-21-2958949473-3205530200-1453100116-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\0mnyjjrw3.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 1632 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1628 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2472 svchost.exe -
Suspicious behavior: EnumeratesProcesses 7 IoCs
pid Process 1688 SolaraBootstrapper.exe 1688 SolaraBootstrapper.exe 1688 SolaraBootstrapper.exe 2472 svchost.exe 2472 svchost.exe 2472 svchost.exe 2472 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 1688 SolaraBootstrapper.exe Token: SeDebugPrivilege 2472 svchost.exe Token: SeBackupPrivilege 2796 vssvc.exe Token: SeRestorePrivilege 2796 vssvc.exe Token: SeAuditPrivilege 2796 vssvc.exe Token: SeIncreaseQuotaPrivilege 2708 WMIC.exe Token: SeSecurityPrivilege 2708 WMIC.exe Token: SeTakeOwnershipPrivilege 2708 WMIC.exe Token: SeLoadDriverPrivilege 2708 WMIC.exe Token: SeSystemProfilePrivilege 2708 WMIC.exe Token: SeSystemtimePrivilege 2708 WMIC.exe Token: SeProfSingleProcessPrivilege 2708 WMIC.exe Token: SeIncBasePriorityPrivilege 2708 WMIC.exe Token: SeCreatePagefilePrivilege 2708 WMIC.exe Token: SeBackupPrivilege 2708 WMIC.exe Token: SeRestorePrivilege 2708 WMIC.exe Token: SeShutdownPrivilege 2708 WMIC.exe Token: SeDebugPrivilege 2708 WMIC.exe Token: SeSystemEnvironmentPrivilege 2708 WMIC.exe Token: SeRemoteShutdownPrivilege 2708 WMIC.exe Token: SeUndockPrivilege 2708 WMIC.exe Token: SeManageVolumePrivilege 2708 WMIC.exe Token: 33 2708 WMIC.exe Token: 34 2708 WMIC.exe Token: 35 2708 WMIC.exe Token: SeIncreaseQuotaPrivilege 2708 WMIC.exe Token: SeSecurityPrivilege 2708 WMIC.exe Token: SeTakeOwnershipPrivilege 2708 WMIC.exe Token: SeLoadDriverPrivilege 2708 WMIC.exe Token: SeSystemProfilePrivilege 2708 WMIC.exe Token: SeSystemtimePrivilege 2708 WMIC.exe Token: SeProfSingleProcessPrivilege 2708 WMIC.exe Token: SeIncBasePriorityPrivilege 2708 WMIC.exe Token: SeCreatePagefilePrivilege 2708 WMIC.exe Token: SeBackupPrivilege 2708 WMIC.exe Token: SeRestorePrivilege 2708 WMIC.exe Token: SeShutdownPrivilege 2708 WMIC.exe Token: SeDebugPrivilege 2708 WMIC.exe Token: SeSystemEnvironmentPrivilege 2708 WMIC.exe Token: SeRemoteShutdownPrivilege 2708 WMIC.exe Token: SeUndockPrivilege 2708 WMIC.exe Token: SeManageVolumePrivilege 2708 WMIC.exe Token: 33 2708 WMIC.exe Token: 34 2708 WMIC.exe Token: 35 2708 WMIC.exe Token: SeBackupPrivilege 1336 wbengine.exe Token: SeRestorePrivilege 1336 wbengine.exe Token: SeSecurityPrivilege 1336 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 1688 wrote to memory of 2472 1688 SolaraBootstrapper.exe 31 PID 1688 wrote to memory of 2472 1688 SolaraBootstrapper.exe 31 PID 1688 wrote to memory of 2472 1688 SolaraBootstrapper.exe 31 PID 2472 wrote to memory of 2784 2472 svchost.exe 32 PID 2472 wrote to memory of 2784 2472 svchost.exe 32 PID 2472 wrote to memory of 2784 2472 svchost.exe 32 PID 2784 wrote to memory of 1632 2784 cmd.exe 34 PID 2784 wrote to memory of 1632 2784 cmd.exe 34 PID 2784 wrote to memory of 1632 2784 cmd.exe 34 PID 2784 wrote to memory of 2708 2784 cmd.exe 37 PID 2784 wrote to memory of 2708 2784 cmd.exe 37 PID 2784 wrote to memory of 2708 2784 cmd.exe 37 PID 2472 wrote to memory of 2320 2472 svchost.exe 39 PID 2472 wrote to memory of 2320 2472 svchost.exe 39 PID 2472 wrote to memory of 2320 2472 svchost.exe 39 PID 2320 wrote to memory of 2172 2320 cmd.exe 41 PID 2320 wrote to memory of 2172 2320 cmd.exe 41 PID 2320 wrote to memory of 2172 2320 cmd.exe 41 PID 2320 wrote to memory of 1880 2320 cmd.exe 42 PID 2320 wrote to memory of 1880 2320 cmd.exe 42 PID 2320 wrote to memory of 1880 2320 cmd.exe 42 PID 2472 wrote to memory of 1992 2472 svchost.exe 43 PID 2472 wrote to memory of 1992 2472 svchost.exe 43 PID 2472 wrote to memory of 1992 2472 svchost.exe 43 PID 1992 wrote to memory of 1172 1992 cmd.exe 45 PID 1992 wrote to memory of 1172 1992 cmd.exe 45 PID 1992 wrote to memory of 1172 1992 cmd.exe 45 PID 2472 wrote to memory of 1628 2472 svchost.exe 50 PID 2472 wrote to memory of 1628 2472 svchost.exe 50 PID 2472 wrote to memory of 1628 2472 svchost.exe 50 -
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\SolaraBootstrapper.exe"C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1688 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Drops startup file
- Executes dropped EXE
- 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:2472 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2784 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1632
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2708
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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:2320 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2172
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1880
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:1992 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1172
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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:1628
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2796
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1336
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:444
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2584
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
968B
MD5a002759ee3761361f80907c02df36b32
SHA12c2e99235299b144ef465fa92c0026a37bc0c33c
SHA25605d10453f26758546e434cd5269994f5d72e52560736eee3b3ef73d27fb941b7
SHA51235f8770b3e0475be1b451443e56597d68b145020cdb32a85eac2d94b66327eeccbf95482bddf7bedcb280b1211aed3265cd75bbf3b7a7fb11ebba97168fc860e
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0
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Filesize
3.2MB
MD5a9f17939e061e0511410aaf77087b02d
SHA1554dc5ce2b0af194364833ea517a4089794fe97e
SHA25619b98f9d5364599c870fa967e544634a635c358b3ed7208d5fc563c95a26e7e2
SHA5124320694375b559ddcb6722d445e9509076f384271aa4445116f5b72a824a33df0aad1d29354b046964050a9676ce6e04e806046870064fe9b70512d99896adc4