Analysis
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max time kernel
121s -
max time network
122s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
29-12-2024 16:28
Behavioral task
behavioral1
Sample
OhioTax.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
OhioTax.exe
Resource
win10v2004-20241007-en
General
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Target
OhioTax.exe
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Size
356KB
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MD5
c7b696a87ebd99919eb5ad685c38e565
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SHA1
b405dc2e87089b0294debdcaeb445a09d3bc2247
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SHA256
608ffc0b1e989e29b454389a9807e3721c075a2334d7d51765b5adad589fa0ef
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SHA512
94e1711f62755e1a838d4c03530111054bd4a5b58b47660d2fc46fe059e1e7997dc6d5042afd8d3273e64d6fd258f0fc3ffd6120308a96fc09a9c0b79973e80e
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SSDEEP
6144:URq9gVZ8CMci9haFy43XbyvtDAwz4e/VE/YbFwrSMiinNzP4U:U7SZciTaw4Hbyhz4uVEgbFQzPx
Malware Config
Extracted
C:\ProgramData\Adobe\Updater6\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/2128-1-0x0000000000390000-0x00000000003F0000-memory.dmp family_chaos behavioral1/files/0x000c000000012260-6.dat family_chaos behavioral1/memory/2372-8-0x0000000000CB0000-0x0000000000D10000-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 2880 bcdedit.exe 2952 bcdedit.exe -
pid Process 1452 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 2372 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-1-5-21-312935884-697965778-3955649944-1000\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\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\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\OM66BHWE\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\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\Accessibility\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\Windows\Start Menu\Programs\Accessories\Accessibility\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\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\T072YXIW\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\Accessories\Tablet PC\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\Content.IE5\98Y29LGS\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\Local\Microsoft\Windows\History\History.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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\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\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-312935884-697965778-3955649944-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\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\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\4DY23DRT\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\Admin\Desktop\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\Maintenance\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\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\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\Music\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\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\R627XHFP\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\Admin\Searches\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\Public\Pictures\Sample Pictures\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\Links\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\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\U8F4PBMO\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\YPLB435F\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\Burn\Burn\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\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\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Public\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\0wiuxo6e4.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 2748 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1708 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2128 OhioTax.exe 2372 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2128 OhioTax.exe 2128 OhioTax.exe 2128 OhioTax.exe 2372 svchost.exe 2372 svchost.exe 2372 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2128 OhioTax.exe Token: SeDebugPrivilege 2372 svchost.exe Token: SeBackupPrivilege 2696 vssvc.exe Token: SeRestorePrivilege 2696 vssvc.exe Token: SeAuditPrivilege 2696 vssvc.exe Token: SeIncreaseQuotaPrivilege 2720 WMIC.exe Token: SeSecurityPrivilege 2720 WMIC.exe Token: SeTakeOwnershipPrivilege 2720 WMIC.exe Token: SeLoadDriverPrivilege 2720 WMIC.exe Token: SeSystemProfilePrivilege 2720 WMIC.exe Token: SeSystemtimePrivilege 2720 WMIC.exe Token: SeProfSingleProcessPrivilege 2720 WMIC.exe Token: SeIncBasePriorityPrivilege 2720 WMIC.exe Token: SeCreatePagefilePrivilege 2720 WMIC.exe Token: SeBackupPrivilege 2720 WMIC.exe Token: SeRestorePrivilege 2720 WMIC.exe Token: SeShutdownPrivilege 2720 WMIC.exe Token: SeDebugPrivilege 2720 WMIC.exe Token: SeSystemEnvironmentPrivilege 2720 WMIC.exe Token: SeRemoteShutdownPrivilege 2720 WMIC.exe Token: SeUndockPrivilege 2720 WMIC.exe Token: SeManageVolumePrivilege 2720 WMIC.exe Token: 33 2720 WMIC.exe Token: 34 2720 WMIC.exe Token: 35 2720 WMIC.exe Token: SeIncreaseQuotaPrivilege 2720 WMIC.exe Token: SeSecurityPrivilege 2720 WMIC.exe Token: SeTakeOwnershipPrivilege 2720 WMIC.exe Token: SeLoadDriverPrivilege 2720 WMIC.exe Token: SeSystemProfilePrivilege 2720 WMIC.exe Token: SeSystemtimePrivilege 2720 WMIC.exe Token: SeProfSingleProcessPrivilege 2720 WMIC.exe Token: SeIncBasePriorityPrivilege 2720 WMIC.exe Token: SeCreatePagefilePrivilege 2720 WMIC.exe Token: SeBackupPrivilege 2720 WMIC.exe Token: SeRestorePrivilege 2720 WMIC.exe Token: SeShutdownPrivilege 2720 WMIC.exe Token: SeDebugPrivilege 2720 WMIC.exe Token: SeSystemEnvironmentPrivilege 2720 WMIC.exe Token: SeRemoteShutdownPrivilege 2720 WMIC.exe Token: SeUndockPrivilege 2720 WMIC.exe Token: SeManageVolumePrivilege 2720 WMIC.exe Token: 33 2720 WMIC.exe Token: 34 2720 WMIC.exe Token: 35 2720 WMIC.exe Token: SeBackupPrivilege 1652 wbengine.exe Token: SeRestorePrivilege 1652 wbengine.exe Token: SeSecurityPrivilege 1652 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2128 wrote to memory of 2372 2128 OhioTax.exe 31 PID 2128 wrote to memory of 2372 2128 OhioTax.exe 31 PID 2128 wrote to memory of 2372 2128 OhioTax.exe 31 PID 2372 wrote to memory of 2708 2372 svchost.exe 32 PID 2372 wrote to memory of 2708 2372 svchost.exe 32 PID 2372 wrote to memory of 2708 2372 svchost.exe 32 PID 2708 wrote to memory of 2748 2708 cmd.exe 34 PID 2708 wrote to memory of 2748 2708 cmd.exe 34 PID 2708 wrote to memory of 2748 2708 cmd.exe 34 PID 2708 wrote to memory of 2720 2708 cmd.exe 37 PID 2708 wrote to memory of 2720 2708 cmd.exe 37 PID 2708 wrote to memory of 2720 2708 cmd.exe 37 PID 2372 wrote to memory of 2536 2372 svchost.exe 39 PID 2372 wrote to memory of 2536 2372 svchost.exe 39 PID 2372 wrote to memory of 2536 2372 svchost.exe 39 PID 2536 wrote to memory of 2880 2536 cmd.exe 41 PID 2536 wrote to memory of 2880 2536 cmd.exe 41 PID 2536 wrote to memory of 2880 2536 cmd.exe 41 PID 2536 wrote to memory of 2952 2536 cmd.exe 42 PID 2536 wrote to memory of 2952 2536 cmd.exe 42 PID 2536 wrote to memory of 2952 2536 cmd.exe 42 PID 2372 wrote to memory of 1932 2372 svchost.exe 43 PID 2372 wrote to memory of 1932 2372 svchost.exe 43 PID 2372 wrote to memory of 1932 2372 svchost.exe 43 PID 1932 wrote to memory of 1452 1932 cmd.exe 45 PID 1932 wrote to memory of 1452 1932 cmd.exe 45 PID 1932 wrote to memory of 1452 1932 cmd.exe 45 PID 2372 wrote to memory of 1708 2372 svchost.exe 49 PID 2372 wrote to memory of 1708 2372 svchost.exe 49 PID 2372 wrote to memory of 1708 2372 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\OhioTax.exe"C:\Users\Admin\AppData\Local\Temp\OhioTax.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2128 -
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:2372 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2708 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2748
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2720
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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:2536 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2880
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2952
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:1932 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1452
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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:1708
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2696
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1652
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2848
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:1916
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
356KB
MD5c7b696a87ebd99919eb5ad685c38e565
SHA1b405dc2e87089b0294debdcaeb445a09d3bc2247
SHA256608ffc0b1e989e29b454389a9807e3721c075a2334d7d51765b5adad589fa0ef
SHA51294e1711f62755e1a838d4c03530111054bd4a5b58b47660d2fc46fe059e1e7997dc6d5042afd8d3273e64d6fd258f0fc3ffd6120308a96fc09a9c0b79973e80e
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0