Analysis
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max time kernel
120s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
25-12-2024 17:01
Behavioral task
behavioral1
Sample
RansomewareBuilder.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
RansomewareBuilder.exe
Resource
win10v2004-20241007-en
General
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Target
RansomewareBuilder.exe
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Size
5.4MB
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MD5
e326e0bb654c0c28d1683c3f740e9a9d
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SHA1
9c1cbd909ab5897532c11be445cf8384f71ee9b7
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SHA256
aad594c4d58ad64350c4e9b4314dcf7fa5b8bb70eb41b0d20f6a0c49a058086c
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SHA512
86c01e92a90ee6573e2f0e384191f0b4ee56ddb92ad9bd8023cbf86a4566d999d56e186eacdfc0ce6f0bb3c4960def13beacb067444a1a229ad7d58d81ba5f91
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SSDEEP
49152:NuKIx29kk3sN2rEt/U964aKjSEvoYY+A2N:
Malware Config
Extracted
C:\ProgramData\Adobe\Updater6\read_it.txt
https://tox.chat/download.html
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/3056-1-0x0000000000970000-0x0000000000EDE000-memory.dmp family_chaos behavioral1/files/0x00080000000120f9-6.dat family_chaos behavioral1/memory/776-10-0x0000000001010000-0x000000000157E000-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 680 bcdedit.exe 900 bcdedit.exe -
Renames multiple (198) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 2924 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 776 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-1-5-21-3063565911-2056067323-3330884624-1000\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\Public\Recorded TV\Sample Media\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\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\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\39RANI6K\desktop.ini svchost.exe File opened for modification C:\Users\Public\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\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\AppData\Roaming\Microsoft\Windows\Start Menu\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\Feeds Cache\U3EGUGI8\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\Admin\Favorites\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\Feeds Cache\QMPQWRBT\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\T1DP8V76\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\Games\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\Public\Recorded TV\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\AppData\Local\Microsoft\Windows\History\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\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\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\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\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\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\Temporary Internet Files\Content.IE5\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\Sample Music\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\Links\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\Internet Explorer\Quick Launch\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\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\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\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\BY17T927\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\MT4W94IX\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\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\Public\Videos\Sample Videos\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\Admin\AppData\Local\Microsoft\Feeds Cache\AQYH36ZT\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3063565911-2056067323-3330884624-1000\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\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\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\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\Saved Games\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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\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\Internet Explorer\Quick Launch\User Pinned\TaskBar\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\Public\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\UGWF8QWZ\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\9lka465er.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 2244 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2028 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 3056 RansomewareBuilder.exe 776 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 3056 RansomewareBuilder.exe 3056 RansomewareBuilder.exe 3056 RansomewareBuilder.exe 776 svchost.exe 776 svchost.exe 776 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 3056 RansomewareBuilder.exe Token: SeDebugPrivilege 776 svchost.exe Token: SeBackupPrivilege 2840 vssvc.exe Token: SeRestorePrivilege 2840 vssvc.exe Token: SeAuditPrivilege 2840 vssvc.exe Token: SeIncreaseQuotaPrivilege 2684 WMIC.exe Token: SeSecurityPrivilege 2684 WMIC.exe Token: SeTakeOwnershipPrivilege 2684 WMIC.exe Token: SeLoadDriverPrivilege 2684 WMIC.exe Token: SeSystemProfilePrivilege 2684 WMIC.exe Token: SeSystemtimePrivilege 2684 WMIC.exe Token: SeProfSingleProcessPrivilege 2684 WMIC.exe Token: SeIncBasePriorityPrivilege 2684 WMIC.exe Token: SeCreatePagefilePrivilege 2684 WMIC.exe Token: SeBackupPrivilege 2684 WMIC.exe Token: SeRestorePrivilege 2684 WMIC.exe Token: SeShutdownPrivilege 2684 WMIC.exe Token: SeDebugPrivilege 2684 WMIC.exe Token: SeSystemEnvironmentPrivilege 2684 WMIC.exe Token: SeRemoteShutdownPrivilege 2684 WMIC.exe Token: SeUndockPrivilege 2684 WMIC.exe Token: SeManageVolumePrivilege 2684 WMIC.exe Token: 33 2684 WMIC.exe Token: 34 2684 WMIC.exe Token: 35 2684 WMIC.exe Token: SeIncreaseQuotaPrivilege 2684 WMIC.exe Token: SeSecurityPrivilege 2684 WMIC.exe Token: SeTakeOwnershipPrivilege 2684 WMIC.exe Token: SeLoadDriverPrivilege 2684 WMIC.exe Token: SeSystemProfilePrivilege 2684 WMIC.exe Token: SeSystemtimePrivilege 2684 WMIC.exe Token: SeProfSingleProcessPrivilege 2684 WMIC.exe Token: SeIncBasePriorityPrivilege 2684 WMIC.exe Token: SeCreatePagefilePrivilege 2684 WMIC.exe Token: SeBackupPrivilege 2684 WMIC.exe Token: SeRestorePrivilege 2684 WMIC.exe Token: SeShutdownPrivilege 2684 WMIC.exe Token: SeDebugPrivilege 2684 WMIC.exe Token: SeSystemEnvironmentPrivilege 2684 WMIC.exe Token: SeRemoteShutdownPrivilege 2684 WMIC.exe Token: SeUndockPrivilege 2684 WMIC.exe Token: SeManageVolumePrivilege 2684 WMIC.exe Token: 33 2684 WMIC.exe Token: 34 2684 WMIC.exe Token: 35 2684 WMIC.exe Token: SeBackupPrivilege 768 wbengine.exe Token: SeRestorePrivilege 768 wbengine.exe Token: SeSecurityPrivilege 768 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 3056 wrote to memory of 776 3056 RansomewareBuilder.exe 30 PID 3056 wrote to memory of 776 3056 RansomewareBuilder.exe 30 PID 3056 wrote to memory of 776 3056 RansomewareBuilder.exe 30 PID 776 wrote to memory of 2880 776 svchost.exe 31 PID 776 wrote to memory of 2880 776 svchost.exe 31 PID 776 wrote to memory of 2880 776 svchost.exe 31 PID 2880 wrote to memory of 2244 2880 cmd.exe 33 PID 2880 wrote to memory of 2244 2880 cmd.exe 33 PID 2880 wrote to memory of 2244 2880 cmd.exe 33 PID 2880 wrote to memory of 2684 2880 cmd.exe 36 PID 2880 wrote to memory of 2684 2880 cmd.exe 36 PID 2880 wrote to memory of 2684 2880 cmd.exe 36 PID 776 wrote to memory of 1340 776 svchost.exe 38 PID 776 wrote to memory of 1340 776 svchost.exe 38 PID 776 wrote to memory of 1340 776 svchost.exe 38 PID 1340 wrote to memory of 680 1340 cmd.exe 40 PID 1340 wrote to memory of 680 1340 cmd.exe 40 PID 1340 wrote to memory of 680 1340 cmd.exe 40 PID 1340 wrote to memory of 900 1340 cmd.exe 41 PID 1340 wrote to memory of 900 1340 cmd.exe 41 PID 1340 wrote to memory of 900 1340 cmd.exe 41 PID 776 wrote to memory of 1020 776 svchost.exe 42 PID 776 wrote to memory of 1020 776 svchost.exe 42 PID 776 wrote to memory of 1020 776 svchost.exe 42 PID 1020 wrote to memory of 2924 1020 cmd.exe 44 PID 1020 wrote to memory of 2924 1020 cmd.exe 44 PID 1020 wrote to memory of 2924 1020 cmd.exe 44 PID 776 wrote to memory of 2028 776 svchost.exe 49 PID 776 wrote to memory of 2028 776 svchost.exe 49 PID 776 wrote to memory of 2028 776 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\RansomewareBuilder.exe"C:\Users\Admin\AppData\Local\Temp\RansomewareBuilder.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3056 -
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:776 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2880 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2244
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2684
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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:1340 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:680
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:900
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:1020 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2924
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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:2028
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2840
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:768
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2816
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2356
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
1KB
MD5989c56f4275e6e04986ce8d7557519b4
SHA14e291831db153b00f3a8829a633fdbbe43cf9838
SHA256169545482fca28799ea6fb239991d8e6dbee49e22efa25c81d5240fe5252ebf6
SHA51237f3ee52a840b7b5ab53e515400f7d888c794640c0d327f224ae921dcfd5cc537b10de6d34e944e0a0460e518d4e721a92a417fed2824ab77533e8048ce1383d
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Filesize
5.4MB
MD5e326e0bb654c0c28d1683c3f740e9a9d
SHA19c1cbd909ab5897532c11be445cf8384f71ee9b7
SHA256aad594c4d58ad64350c4e9b4314dcf7fa5b8bb70eb41b0d20f6a0c49a058086c
SHA51286c01e92a90ee6573e2f0e384191f0b4ee56ddb92ad9bd8023cbf86a4566d999d56e186eacdfc0ce6f0bb3c4960def13beacb067444a1a229ad7d58d81ba5f91
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0