Analysis
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max time kernel
198s -
max time network
126s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
09-04-2024 21:00
Static task
static1
1 signatures
Behavioral task
behavioral1
Sample
trabajo escuela.exe
Resource
win7-20240221-en
windows7-x64
19 signatures
300 seconds
Behavioral task
behavioral2
Sample
trabajo escuela.exe
Resource
win10-20240404-en
windows10-1703-x64
26 signatures
300 seconds
Behavioral task
behavioral3
Sample
trabajo escuela.exe
Resource
win10v2004-20240226-en
windows10-2004-x64
22 signatures
300 seconds
Behavioral task
behavioral4
Sample
trabajo escuela.exe
Resource
win11-20240221-en
windows11-21h2-x64
21 signatures
300 seconds
General
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Target
trabajo escuela.exe
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Size
614KB
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MD5
535994874b99eea69b30569bc7176440
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SHA1
e10245fd72b3ff5f219b18fb292fb3b33ae3a3e5
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SHA256
79c0f9223e6861b8bf5f6f3ef860bc517e8fcb544efee34bb5f2cc9867af75a7
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SHA512
12bb6e3737f545ecbef371e079d6764d8e35ff8f940258b430f16e07d34e214c030f6ce0518461639178209fe2da62941a1de763fc25490c0e02e8e064da596f
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SSDEEP
12288:YctEagGmcl4gBF1BRnI6hAVebOe1qOX+t4Z3Fy0RMDbXScaTRM:ZR+cl7X1BRnI6hmebOe1qMuJXifu
Score
10/10
Malware Config
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/files/0x0009000000012265-12.dat family_chaos behavioral1/memory/2288-19-0x00000000003B0000-0x000000000045A000-memory.dmp family_chaos behavioral1/memory/2516-26-0x0000000001360000-0x000000000140A000-memory.dmp family_chaos -
Deletes shadow copies 2 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 1624 bcdedit.exe 2112 bcdedit.exe -
Renames multiple (200) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 836 wbadmin.exe -
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\LEER IMPORTANTE.txt svchost.exe -
Executes dropped EXE 2 IoCs
pid Process 2288 CRYpt0r V3.0.exe 2516 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) 34 IoCs
description ioc Process 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\Public\Desktop\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\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\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\AppData\Roaming\Microsoft\Windows\SendTo\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\Favorites\Links for United States\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\Admin\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 F:\$RECYCLE.BIN\S-1-5-21-2461186416-2307104501-1787948496-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\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\Admin\AppData\Roaming\Microsoft\Windows\Libraries\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\Music\Sample Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\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\Maintenance\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\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\Videos\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\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\Favorites\Links\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\Pictures\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2461186416-2307104501-1787948496-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\rusvw3avf.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 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2756 vssadmin.exe -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2516 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2288 CRYpt0r V3.0.exe 2288 CRYpt0r V3.0.exe 2516 svchost.exe 2516 svchost.exe 2516 svchost.exe 2516 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2288 CRYpt0r V3.0.exe Token: SeDebugPrivilege 2516 svchost.exe Token: SeBackupPrivilege 1532 vssvc.exe Token: SeRestorePrivilege 1532 vssvc.exe Token: SeAuditPrivilege 1532 vssvc.exe Token: SeIncreaseQuotaPrivilege 2296 WMIC.exe Token: SeSecurityPrivilege 2296 WMIC.exe Token: SeTakeOwnershipPrivilege 2296 WMIC.exe Token: SeLoadDriverPrivilege 2296 WMIC.exe Token: SeSystemProfilePrivilege 2296 WMIC.exe Token: SeSystemtimePrivilege 2296 WMIC.exe Token: SeProfSingleProcessPrivilege 2296 WMIC.exe Token: SeIncBasePriorityPrivilege 2296 WMIC.exe Token: SeCreatePagefilePrivilege 2296 WMIC.exe Token: SeBackupPrivilege 2296 WMIC.exe Token: SeRestorePrivilege 2296 WMIC.exe Token: SeShutdownPrivilege 2296 WMIC.exe Token: SeDebugPrivilege 2296 WMIC.exe Token: SeSystemEnvironmentPrivilege 2296 WMIC.exe Token: SeRemoteShutdownPrivilege 2296 WMIC.exe Token: SeUndockPrivilege 2296 WMIC.exe Token: SeManageVolumePrivilege 2296 WMIC.exe Token: 33 2296 WMIC.exe Token: 34 2296 WMIC.exe Token: 35 2296 WMIC.exe Token: SeIncreaseQuotaPrivilege 2296 WMIC.exe Token: SeSecurityPrivilege 2296 WMIC.exe Token: SeTakeOwnershipPrivilege 2296 WMIC.exe Token: SeLoadDriverPrivilege 2296 WMIC.exe Token: SeSystemProfilePrivilege 2296 WMIC.exe Token: SeSystemtimePrivilege 2296 WMIC.exe Token: SeProfSingleProcessPrivilege 2296 WMIC.exe Token: SeIncBasePriorityPrivilege 2296 WMIC.exe Token: SeCreatePagefilePrivilege 2296 WMIC.exe Token: SeBackupPrivilege 2296 WMIC.exe Token: SeRestorePrivilege 2296 WMIC.exe Token: SeShutdownPrivilege 2296 WMIC.exe Token: SeDebugPrivilege 2296 WMIC.exe Token: SeSystemEnvironmentPrivilege 2296 WMIC.exe Token: SeRemoteShutdownPrivilege 2296 WMIC.exe Token: SeUndockPrivilege 2296 WMIC.exe Token: SeManageVolumePrivilege 2296 WMIC.exe Token: 33 2296 WMIC.exe Token: 34 2296 WMIC.exe Token: 35 2296 WMIC.exe Token: SeBackupPrivilege 1032 wbengine.exe Token: SeRestorePrivilege 1032 wbengine.exe Token: SeSecurityPrivilege 1032 wbengine.exe -
Suspicious use of WriteProcessMemory 33 IoCs
description pid Process procid_target PID 896 wrote to memory of 2288 896 trabajo escuela.exe 28 PID 896 wrote to memory of 2288 896 trabajo escuela.exe 28 PID 896 wrote to memory of 2288 896 trabajo escuela.exe 28 PID 2288 wrote to memory of 2516 2288 CRYpt0r V3.0.exe 29 PID 2288 wrote to memory of 2516 2288 CRYpt0r V3.0.exe 29 PID 2288 wrote to memory of 2516 2288 CRYpt0r V3.0.exe 29 PID 2516 wrote to memory of 2816 2516 svchost.exe 31 PID 2516 wrote to memory of 2816 2516 svchost.exe 31 PID 2516 wrote to memory of 2816 2516 svchost.exe 31 PID 2816 wrote to memory of 2756 2816 cmd.exe 33 PID 2816 wrote to memory of 2756 2816 cmd.exe 33 PID 2816 wrote to memory of 2756 2816 cmd.exe 33 PID 2816 wrote to memory of 2296 2816 cmd.exe 37 PID 2816 wrote to memory of 2296 2816 cmd.exe 37 PID 2816 wrote to memory of 2296 2816 cmd.exe 37 PID 2516 wrote to memory of 2200 2516 svchost.exe 39 PID 2516 wrote to memory of 2200 2516 svchost.exe 39 PID 2516 wrote to memory of 2200 2516 svchost.exe 39 PID 2200 wrote to memory of 1624 2200 cmd.exe 41 PID 2200 wrote to memory of 1624 2200 cmd.exe 41 PID 2200 wrote to memory of 1624 2200 cmd.exe 41 PID 2200 wrote to memory of 2112 2200 cmd.exe 42 PID 2200 wrote to memory of 2112 2200 cmd.exe 42 PID 2200 wrote to memory of 2112 2200 cmd.exe 42 PID 2516 wrote to memory of 1876 2516 svchost.exe 43 PID 2516 wrote to memory of 1876 2516 svchost.exe 43 PID 2516 wrote to memory of 1876 2516 svchost.exe 43 PID 1876 wrote to memory of 836 1876 cmd.exe 45 PID 1876 wrote to memory of 836 1876 cmd.exe 45 PID 1876 wrote to memory of 836 1876 cmd.exe 45 PID 2516 wrote to memory of 1084 2516 svchost.exe 49 PID 2516 wrote to memory of 1084 2516 svchost.exe 49 PID 2516 wrote to memory of 1084 2516 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\trabajo escuela.exe"C:\Users\Admin\AppData\Local\Temp\trabajo escuela.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:896 -
C:\Users\Admin\AppData\Local\Temp\CRYpt0r V3.0.exe"C:\Users\Admin\AppData\Local\Temp\CRYpt0r V3.0.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2288 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"3⤵
- 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:2516 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete4⤵
- Suspicious use of WriteProcessMemory
PID:2816 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet5⤵
- Interacts with shadow copies
PID:2756
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete5⤵
- Suspicious use of AdjustPrivilegeToken
PID:2296
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no4⤵
- Suspicious use of WriteProcessMemory
PID:2200 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures5⤵
- Modifies boot configuration data using bcdedit
PID:1624
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no5⤵
- Modifies boot configuration data using bcdedit
PID:2112
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet4⤵
- Suspicious use of WriteProcessMemory
PID:1876 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet5⤵
- Deletes backup catalog
PID:836
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\LEER IMPORTANTE.txt4⤵PID:1084
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1532
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1032
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2032
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2312
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
652KB
MD5f04e2d871aac9bca6b4cbb87a7c4b583
SHA117d06a123d289510e9bbeb9d2ec89da4caa8f9d5
SHA25624761b824fa4baf33ef574f1fff99a72ab5b7e2272aecf365d39b65748b01f6d
SHA512c6624289766aeb87d9a3387130c3afc9c1ddb8f6d1ccc789f14af2d7858303629c1ac75fc89eeceb3069d0e94a0a9242c4ce705f3ec846e8f5be2566f095074a
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Filesize
1KB
MD5c330fe6230777cc10704e18bc35f4b5a
SHA103003156eefe7b2224afc900d58e15ac62f43fea
SHA256fc668aa6ea357639d9cf3320018dededde311a70b8d12932907dfa0416c4dc14
SHA512bd719db8e6e73f8c7feae0fb1b5b4592c789468f34aa7dfb7ce603e2c2fe3f43542687c533fb542e8f6fbf652ab5d8e818f91049d93343971038f648ddb5bc10