Analysis
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max time kernel
118s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20230831-en -
resource tags
arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system -
submitted
06/09/2023, 17:37
Behavioral task
behavioral1
Sample
WinRAR_JC.exe
Resource
win7-20230831-en
Behavioral task
behavioral2
Sample
WinRAR_JC.exe
Resource
win10v2004-20230831-en
General
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Target
WinRAR_JC.exe
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Size
270KB
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MD5
14ea366be5cb691078be2c302590f435
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SHA1
84e562bb99249a58849f6f82b29a7746dd144900
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SHA256
82e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a
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SHA512
9be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9
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SSDEEP
6144:r02q9t3hysg2+00aHYHjdCoD5oa+S/dIm:Aj3hBg/00aHYDd3DCO/dI
Malware Config
Extracted
C:\ProgramData\Adobe\Updater6\NOTE!.txt
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 5 IoCs
resource yara_rule behavioral1/memory/2408-0-0x00000000011E0000-0x0000000001228000-memory.dmp family_chaos behavioral1/memory/2408-2-0x000000001AAB0000-0x000000001AB30000-memory.dmp family_chaos behavioral1/files/0x000b00000001223f-5.dat family_chaos behavioral1/files/0x000b00000001223f-7.dat family_chaos behavioral1/memory/2692-8-0x00000000013B0000-0x00000000013F8000-memory.dmp family_chaos -
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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pid Process 2216 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 WinRAR.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\NOTE!.txt WinRAR.exe -
Executes dropped EXE 1 IoCs
pid Process 2692 WinRAR.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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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000\Software\Microsoft\Windows\CurrentVersion\Run\UpdateTask = "C:\\Users\\Admin\\AppData\\Roaming\\WinRAR.exe" WinRAR.exe -
Drops desktop.ini file(s) 64 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Pictures\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\47XKHVXL\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\498NH330\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\KRO4ET95\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Downloads\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Videos\desktop.ini WinRAR.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3513876443-2771975297-1923446376-1000\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\74K2RCMQ\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Tablet PC\Desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Music\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\O8C6W9KQ\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Libraries\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Links\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\3BNCR2DX\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Games\Desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\7QQDM6BV\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Music\Sample Music\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Videos\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Documents\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Recorded TV\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Searches\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\History.IE5\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Documents\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Music\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini WinRAR.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini WinRAR.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\desktop.ini WinRAR.exe File opened for modification C:\Users\Public\Desktop\desktop.ini WinRAR.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini WinRAR.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3513876443-2771975297-1923446376-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\dgjjbeb8m.jpg" WinRAR.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2656 vssadmin.exe -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2408 WinRAR_JC.exe 2692 WinRAR.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2408 WinRAR_JC.exe 2408 WinRAR_JC.exe 2692 WinRAR.exe 2692 WinRAR.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2408 WinRAR_JC.exe Token: SeDebugPrivilege 2692 WinRAR.exe Token: SeBackupPrivilege 2636 vssvc.exe Token: SeRestorePrivilege 2636 vssvc.exe Token: SeAuditPrivilege 2636 vssvc.exe Token: SeIncreaseQuotaPrivilege 2404 WMIC.exe Token: SeSecurityPrivilege 2404 WMIC.exe Token: SeTakeOwnershipPrivilege 2404 WMIC.exe Token: SeLoadDriverPrivilege 2404 WMIC.exe Token: SeSystemProfilePrivilege 2404 WMIC.exe Token: SeSystemtimePrivilege 2404 WMIC.exe Token: SeProfSingleProcessPrivilege 2404 WMIC.exe Token: SeIncBasePriorityPrivilege 2404 WMIC.exe Token: SeCreatePagefilePrivilege 2404 WMIC.exe Token: SeBackupPrivilege 2404 WMIC.exe Token: SeRestorePrivilege 2404 WMIC.exe Token: SeShutdownPrivilege 2404 WMIC.exe Token: SeDebugPrivilege 2404 WMIC.exe Token: SeSystemEnvironmentPrivilege 2404 WMIC.exe Token: SeRemoteShutdownPrivilege 2404 WMIC.exe Token: SeUndockPrivilege 2404 WMIC.exe Token: SeManageVolumePrivilege 2404 WMIC.exe Token: 33 2404 WMIC.exe Token: 34 2404 WMIC.exe Token: 35 2404 WMIC.exe Token: SeIncreaseQuotaPrivilege 2404 WMIC.exe Token: SeSecurityPrivilege 2404 WMIC.exe Token: SeTakeOwnershipPrivilege 2404 WMIC.exe Token: SeLoadDriverPrivilege 2404 WMIC.exe Token: SeSystemProfilePrivilege 2404 WMIC.exe Token: SeSystemtimePrivilege 2404 WMIC.exe Token: SeProfSingleProcessPrivilege 2404 WMIC.exe Token: SeIncBasePriorityPrivilege 2404 WMIC.exe Token: SeCreatePagefilePrivilege 2404 WMIC.exe Token: SeBackupPrivilege 2404 WMIC.exe Token: SeRestorePrivilege 2404 WMIC.exe Token: SeShutdownPrivilege 2404 WMIC.exe Token: SeDebugPrivilege 2404 WMIC.exe Token: SeSystemEnvironmentPrivilege 2404 WMIC.exe Token: SeRemoteShutdownPrivilege 2404 WMIC.exe Token: SeUndockPrivilege 2404 WMIC.exe Token: SeManageVolumePrivilege 2404 WMIC.exe Token: 33 2404 WMIC.exe Token: 34 2404 WMIC.exe Token: 35 2404 WMIC.exe Token: SeBackupPrivilege 1428 wbengine.exe Token: SeRestorePrivilege 1428 wbengine.exe Token: SeSecurityPrivilege 1428 wbengine.exe -
Suspicious use of WriteProcessMemory 21 IoCs
description pid Process procid_target PID 2408 wrote to memory of 2692 2408 WinRAR_JC.exe 28 PID 2408 wrote to memory of 2692 2408 WinRAR_JC.exe 28 PID 2408 wrote to memory of 2692 2408 WinRAR_JC.exe 28 PID 2692 wrote to memory of 828 2692 WinRAR.exe 29 PID 2692 wrote to memory of 828 2692 WinRAR.exe 29 PID 2692 wrote to memory of 828 2692 WinRAR.exe 29 PID 828 wrote to memory of 2656 828 cmd.exe 31 PID 828 wrote to memory of 2656 828 cmd.exe 31 PID 828 wrote to memory of 2656 828 cmd.exe 31 PID 828 wrote to memory of 2404 828 cmd.exe 34 PID 828 wrote to memory of 2404 828 cmd.exe 34 PID 828 wrote to memory of 2404 828 cmd.exe 34 PID 2692 wrote to memory of 2964 2692 WinRAR.exe 36 PID 2692 wrote to memory of 2964 2692 WinRAR.exe 36 PID 2692 wrote to memory of 2964 2692 WinRAR.exe 36 PID 2964 wrote to memory of 2216 2964 cmd.exe 38 PID 2964 wrote to memory of 2216 2964 cmd.exe 38 PID 2964 wrote to memory of 2216 2964 cmd.exe 38 PID 2692 wrote to memory of 2176 2692 WinRAR.exe 44 PID 2692 wrote to memory of 2176 2692 WinRAR.exe 44 PID 2692 wrote to memory of 2176 2692 WinRAR.exe 44 -
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\WinRAR_JC.exe"C:\Users\Admin\AppData\Local\Temp\WinRAR_JC.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2408 -
C:\Users\Admin\AppData\Roaming\WinRAR.exe"C:\Users\Admin\AppData\Roaming\WinRAR.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:2692 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:828 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2656
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2404
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2964 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2216
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\NOTE!.txt3⤵PID:2176
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2636
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1428
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1736
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2712
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
595B
MD57cff3b94ef1413349cdf9d4742f9cd77
SHA10569d834acc4a41e0b47bc1d03dcf27430106096
SHA256bb6cdcdbb8d8b17243cce8bc7c9d7eee1872b63313640e5d63c63619712ddd8d
SHA5121425864a3944742df1f4f849455c3224e2ee281b4c19dbc46af180efaaa1fb35dc14ef047faa02ba92e3d8b5a33ad60cc65c7b4ea9e1182a5b91d01e9edd2873
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Filesize
595B
MD57cff3b94ef1413349cdf9d4742f9cd77
SHA10569d834acc4a41e0b47bc1d03dcf27430106096
SHA256bb6cdcdbb8d8b17243cce8bc7c9d7eee1872b63313640e5d63c63619712ddd8d
SHA5121425864a3944742df1f4f849455c3224e2ee281b4c19dbc46af180efaaa1fb35dc14ef047faa02ba92e3d8b5a33ad60cc65c7b4ea9e1182a5b91d01e9edd2873
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Filesize
270KB
MD514ea366be5cb691078be2c302590f435
SHA184e562bb99249a58849f6f82b29a7746dd144900
SHA25682e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a
SHA5129be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9
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Filesize
270KB
MD514ea366be5cb691078be2c302590f435
SHA184e562bb99249a58849f6f82b29a7746dd144900
SHA25682e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a
SHA5129be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0