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
23/03/2025, 05:15
Behavioral task
behavioral1
Sample
yea.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
yea.exe
Resource
win10v2004-20250313-en
General
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Target
yea.exe
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Size
27KB
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MD5
d0fedfe9df8f5440847a57e531262e0e
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SHA1
78ffb5eaa655ba8d4e7f869d012f347a07d1eaa6
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SHA256
fbc39e38d112f99731151a8e2dc19765cdc18150109064c0df6f6a61bbbdf4e5
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SHA512
94941cbd9dd1ca3aef125ae502368a5bf9f8a193662f621e12736047db1b31b9b09646b48e4a3a5114da125b22436adb276ff92ebac339269f1084f22c14ecf7
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SSDEEP
384:LtWZPzzxAm1vS5ZooqYEWx0noBeuBb6llVOy5o91Ep+82vz:C7zxAmOS/Y70nWeu1Cho9uw82L
Malware Config
Extracted
C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\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/2736-1-0x00000000012C0000-0x00000000012CE000-memory.dmp family_chaos behavioral1/files/0x000a0000000122ce-6.dat family_chaos behavioral1/memory/2344-8-0x00000000003A0000-0x00000000003AE000-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 2352 bcdedit.exe 1448 bcdedit.exe -
pid Process 684 wbadmin.exe -
Disables Task Manager via registry modification
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Drops startup file 2 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 2344 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\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Public\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\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\U8F4PBMO\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\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\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\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\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\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\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\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\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\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\Windows PowerShell\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\Favorites\Links for United States\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\YPLB435F\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\Videos\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\Ringtones\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\Admin\Favorites\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\Default\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\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Public\Downloads\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\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\Temporary Internet Files\Content.IE5\CUMHXU73\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\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\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\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\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\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\Burn\Burn\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini 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 2816 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 864 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2344 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2736 yea.exe 2736 yea.exe 2736 yea.exe 2344 svchost.exe 2344 svchost.exe 2344 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2736 yea.exe Token: SeDebugPrivilege 2344 svchost.exe Token: SeBackupPrivilege 2564 vssvc.exe Token: SeRestorePrivilege 2564 vssvc.exe Token: SeAuditPrivilege 2564 vssvc.exe Token: SeIncreaseQuotaPrivilege 1876 WMIC.exe Token: SeSecurityPrivilege 1876 WMIC.exe Token: SeTakeOwnershipPrivilege 1876 WMIC.exe Token: SeLoadDriverPrivilege 1876 WMIC.exe Token: SeSystemProfilePrivilege 1876 WMIC.exe Token: SeSystemtimePrivilege 1876 WMIC.exe Token: SeProfSingleProcessPrivilege 1876 WMIC.exe Token: SeIncBasePriorityPrivilege 1876 WMIC.exe Token: SeCreatePagefilePrivilege 1876 WMIC.exe Token: SeBackupPrivilege 1876 WMIC.exe Token: SeRestorePrivilege 1876 WMIC.exe Token: SeShutdownPrivilege 1876 WMIC.exe Token: SeDebugPrivilege 1876 WMIC.exe Token: SeSystemEnvironmentPrivilege 1876 WMIC.exe Token: SeRemoteShutdownPrivilege 1876 WMIC.exe Token: SeUndockPrivilege 1876 WMIC.exe Token: SeManageVolumePrivilege 1876 WMIC.exe Token: 33 1876 WMIC.exe Token: 34 1876 WMIC.exe Token: 35 1876 WMIC.exe Token: SeIncreaseQuotaPrivilege 1876 WMIC.exe Token: SeSecurityPrivilege 1876 WMIC.exe Token: SeTakeOwnershipPrivilege 1876 WMIC.exe Token: SeLoadDriverPrivilege 1876 WMIC.exe Token: SeSystemProfilePrivilege 1876 WMIC.exe Token: SeSystemtimePrivilege 1876 WMIC.exe Token: SeProfSingleProcessPrivilege 1876 WMIC.exe Token: SeIncBasePriorityPrivilege 1876 WMIC.exe Token: SeCreatePagefilePrivilege 1876 WMIC.exe Token: SeBackupPrivilege 1876 WMIC.exe Token: SeRestorePrivilege 1876 WMIC.exe Token: SeShutdownPrivilege 1876 WMIC.exe Token: SeDebugPrivilege 1876 WMIC.exe Token: SeSystemEnvironmentPrivilege 1876 WMIC.exe Token: SeRemoteShutdownPrivilege 1876 WMIC.exe Token: SeUndockPrivilege 1876 WMIC.exe Token: SeManageVolumePrivilege 1876 WMIC.exe Token: 33 1876 WMIC.exe Token: 34 1876 WMIC.exe Token: 35 1876 WMIC.exe Token: SeBackupPrivilege 1644 wbengine.exe Token: SeRestorePrivilege 1644 wbengine.exe Token: SeSecurityPrivilege 1644 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2736 wrote to memory of 2344 2736 yea.exe 31 PID 2736 wrote to memory of 2344 2736 yea.exe 31 PID 2736 wrote to memory of 2344 2736 yea.exe 31 PID 2344 wrote to memory of 1648 2344 svchost.exe 32 PID 2344 wrote to memory of 1648 2344 svchost.exe 32 PID 2344 wrote to memory of 1648 2344 svchost.exe 32 PID 1648 wrote to memory of 2816 1648 cmd.exe 34 PID 1648 wrote to memory of 2816 1648 cmd.exe 34 PID 1648 wrote to memory of 2816 1648 cmd.exe 34 PID 1648 wrote to memory of 1876 1648 cmd.exe 37 PID 1648 wrote to memory of 1876 1648 cmd.exe 37 PID 1648 wrote to memory of 1876 1648 cmd.exe 37 PID 2344 wrote to memory of 2796 2344 svchost.exe 39 PID 2344 wrote to memory of 2796 2344 svchost.exe 39 PID 2344 wrote to memory of 2796 2344 svchost.exe 39 PID 2796 wrote to memory of 2352 2796 cmd.exe 41 PID 2796 wrote to memory of 2352 2796 cmd.exe 41 PID 2796 wrote to memory of 2352 2796 cmd.exe 41 PID 2796 wrote to memory of 1448 2796 cmd.exe 42 PID 2796 wrote to memory of 1448 2796 cmd.exe 42 PID 2796 wrote to memory of 1448 2796 cmd.exe 42 PID 2344 wrote to memory of 760 2344 svchost.exe 43 PID 2344 wrote to memory of 760 2344 svchost.exe 43 PID 2344 wrote to memory of 760 2344 svchost.exe 43 PID 760 wrote to memory of 684 760 cmd.exe 45 PID 760 wrote to memory of 684 760 cmd.exe 45 PID 760 wrote to memory of 684 760 cmd.exe 45 PID 2344 wrote to memory of 864 2344 svchost.exe 50 PID 2344 wrote to memory of 864 2344 svchost.exe 50 PID 2344 wrote to memory of 864 2344 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\yea.exe"C:\Users\Admin\AppData\Local\Temp\yea.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2736 -
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)
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2344 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1648 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2816
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1876
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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:2796 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2352
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1448
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:760 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:684
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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:864
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2564
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1644
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2800
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2732
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
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
27KB
MD5d0fedfe9df8f5440847a57e531262e0e
SHA178ffb5eaa655ba8d4e7f869d012f347a07d1eaa6
SHA256fbc39e38d112f99731151a8e2dc19765cdc18150109064c0df6f6a61bbbdf4e5
SHA51294941cbd9dd1ca3aef125ae502368a5bf9f8a193662f621e12736047db1b31b9b09646b48e4a3a5114da125b22436adb276ff92ebac339269f1084f22c14ecf7
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Filesize
582B
MD5ed5cc52876db869de48a4783069c2a5e
SHA1a9d51ceaeff715ace430f9462ab2ee4e7f33e70e
SHA25645726f2f29967ef016f8d556fb6468a577307d67388cc4530295a9ca10fdfa36
SHA5121745aefb9b4db4cdd7c08ee3a7d133db08f35a336fd18b598211519b481ef25ac84a3e8a3da3db06caef9f531288d1cf0ca8d4b2560637945e7953e8b45421f5
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0