Resubmissions
18-04-2024 16:18
240418-tr7fwsae6x 1013-04-2024 06:33
240413-hbqbwseg9z 1012-04-2024 09:47
240412-lr6klacd6s 10Analysis
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max time kernel
119s -
max time network
117s -
platform
windows7_x64 -
resource
win7-20240215-en -
resource tags
arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system -
submitted
18-04-2024 16:18
Behavioral task
behavioral1
Sample
Antivirus.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
Antivirus.exe
Resource
win10v2004-20240412-en
Behavioral task
behavioral3
Sample
decryptor-decrypter/Decrypter.exe
Resource
win7-20240221-en
Behavioral task
behavioral4
Sample
decryptor-decrypter/Decrypter.exe
Resource
win10v2004-20240412-en
General
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Target
Antivirus.exe
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Size
111KB
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MD5
df1ce61fb4869963a1e95a917adef9d0
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SHA1
bcf132651a5bd948e758441e4733519d1502c8bf
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SHA256
e58bf0a81866c21e25dbe8f85fd74304259be3e1b53019f857c2354e23f71b1e
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SHA512
d2867e1b00900098674f1a87653a9f016911649162c66f0eab67336f758a6611a497bc21a6cbe336bbc2464212bfec59e991b99aa92777ad2250e72b4e17888b
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SSDEEP
3072:CB7q9NKEXUrQlGRSAMHsEwGYMl9AYGywOjvOjJ:CB7q9CQ8hMs7GpKPOaj
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/memory/3028-0-0x0000000000350000-0x0000000000372000-memory.dmp family_chaos behavioral1/files/0x000a000000012252-6.dat family_chaos behavioral1/memory/2852-8-0x0000000000EE0000-0x0000000000F02000-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 2920 bcdedit.exe 2980 bcdedit.exe -
Renames multiple (187) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 2764 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\hehehe.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 2852 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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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\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\Maintenance\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\Pictures\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\Favorites\Links for United States\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\Videos\Sample Videos\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\Feeds Cache\EY0DVRIO\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\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\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\P1KETFJO\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\Windows\Temporary Internet Files\desktop.ini svchost.exe File opened for modification C:\Users\Public\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\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\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\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\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\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\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\Local\Microsoft\Feeds Cache\F5ZW0CRZ\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\1MQ01HTG\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\Local\Microsoft\Windows\History\History.IE5\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\Internet Explorer\Quick Launch\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\Admin\Favorites\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\Admin\AppData\Local\Microsoft\Feeds Cache\P56GQFE8\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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\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\Public\Downloads\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\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\IF692Q5Y\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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\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\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\FA862KXF\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\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\Admin\AppData\Local\Microsoft\Feeds Cache\K03K2CA5\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\Games\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\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\Libraries\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\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\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\thtcer53f.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 2608 vssadmin.exe -
Modifies registry class 8 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software\Microsoft\Windows\GameUX solitaire.exe Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software\Microsoft\Windows\GameUX\GameStats solitaire.exe Set value (int) \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software\Microsoft\Windows\GameUX\GameStats\{8669ECE8-D1C3-4345-8310-E60F6D44FDAF}\LastPlayed = "0" solitaire.exe Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software\Microsoft\Windows\GameUX\GameStats\{8669ECE8-D1C3-4345-8310-E60F6D44FDAF} solitaire.exe Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings solitaire.exe Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software solitaire.exe Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software\Microsoft solitaire.exe Key created \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000_CLASSES\Local Settings\Software\Microsoft\Windows solitaire.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1548 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 3028 Antivirus.exe 2852 svchost.exe -
Suspicious behavior: EnumeratesProcesses 5 IoCs
pid Process 3028 Antivirus.exe 3028 Antivirus.exe 2852 svchost.exe 2852 svchost.exe 2852 svchost.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 3000 solitaire.exe -
Suspicious use of AdjustPrivilegeToken 52 IoCs
description pid Process Token: SeDebugPrivilege 3028 Antivirus.exe Token: SeDebugPrivilege 2852 svchost.exe Token: SeBackupPrivilege 2060 vssvc.exe Token: SeRestorePrivilege 2060 vssvc.exe Token: SeAuditPrivilege 2060 vssvc.exe Token: SeIncreaseQuotaPrivilege 2956 WMIC.exe Token: SeSecurityPrivilege 2956 WMIC.exe Token: SeTakeOwnershipPrivilege 2956 WMIC.exe Token: SeLoadDriverPrivilege 2956 WMIC.exe Token: SeSystemProfilePrivilege 2956 WMIC.exe Token: SeSystemtimePrivilege 2956 WMIC.exe Token: SeProfSingleProcessPrivilege 2956 WMIC.exe Token: SeIncBasePriorityPrivilege 2956 WMIC.exe Token: SeCreatePagefilePrivilege 2956 WMIC.exe Token: SeBackupPrivilege 2956 WMIC.exe Token: SeRestorePrivilege 2956 WMIC.exe Token: SeShutdownPrivilege 2956 WMIC.exe Token: SeDebugPrivilege 2956 WMIC.exe Token: SeSystemEnvironmentPrivilege 2956 WMIC.exe Token: SeRemoteShutdownPrivilege 2956 WMIC.exe Token: SeUndockPrivilege 2956 WMIC.exe Token: SeManageVolumePrivilege 2956 WMIC.exe Token: 33 2956 WMIC.exe Token: 34 2956 WMIC.exe Token: 35 2956 WMIC.exe Token: SeIncreaseQuotaPrivilege 2956 WMIC.exe Token: SeSecurityPrivilege 2956 WMIC.exe Token: SeTakeOwnershipPrivilege 2956 WMIC.exe Token: SeLoadDriverPrivilege 2956 WMIC.exe Token: SeSystemProfilePrivilege 2956 WMIC.exe Token: SeSystemtimePrivilege 2956 WMIC.exe Token: SeProfSingleProcessPrivilege 2956 WMIC.exe Token: SeIncBasePriorityPrivilege 2956 WMIC.exe Token: SeCreatePagefilePrivilege 2956 WMIC.exe Token: SeBackupPrivilege 2956 WMIC.exe Token: SeRestorePrivilege 2956 WMIC.exe Token: SeShutdownPrivilege 2956 WMIC.exe Token: SeDebugPrivilege 2956 WMIC.exe Token: SeSystemEnvironmentPrivilege 2956 WMIC.exe Token: SeRemoteShutdownPrivilege 2956 WMIC.exe Token: SeUndockPrivilege 2956 WMIC.exe Token: SeManageVolumePrivilege 2956 WMIC.exe Token: 33 2956 WMIC.exe Token: 34 2956 WMIC.exe Token: 35 2956 WMIC.exe Token: SeBackupPrivilege 2428 wbengine.exe Token: SeRestorePrivilege 2428 wbengine.exe Token: SeSecurityPrivilege 2428 wbengine.exe Token: 33 2340 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 2340 AUDIODG.EXE Token: 33 2340 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 2340 AUDIODG.EXE -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 3028 wrote to memory of 2852 3028 Antivirus.exe 28 PID 3028 wrote to memory of 2852 3028 Antivirus.exe 28 PID 3028 wrote to memory of 2852 3028 Antivirus.exe 28 PID 2852 wrote to memory of 2676 2852 svchost.exe 29 PID 2852 wrote to memory of 2676 2852 svchost.exe 29 PID 2852 wrote to memory of 2676 2852 svchost.exe 29 PID 2676 wrote to memory of 2608 2676 cmd.exe 31 PID 2676 wrote to memory of 2608 2676 cmd.exe 31 PID 2676 wrote to memory of 2608 2676 cmd.exe 31 PID 2676 wrote to memory of 2956 2676 cmd.exe 34 PID 2676 wrote to memory of 2956 2676 cmd.exe 34 PID 2676 wrote to memory of 2956 2676 cmd.exe 34 PID 2852 wrote to memory of 2820 2852 svchost.exe 36 PID 2852 wrote to memory of 2820 2852 svchost.exe 36 PID 2852 wrote to memory of 2820 2852 svchost.exe 36 PID 2820 wrote to memory of 2920 2820 cmd.exe 38 PID 2820 wrote to memory of 2920 2820 cmd.exe 38 PID 2820 wrote to memory of 2920 2820 cmd.exe 38 PID 2820 wrote to memory of 2980 2820 cmd.exe 39 PID 2820 wrote to memory of 2980 2820 cmd.exe 39 PID 2820 wrote to memory of 2980 2820 cmd.exe 39 PID 2852 wrote to memory of 2936 2852 svchost.exe 40 PID 2852 wrote to memory of 2936 2852 svchost.exe 40 PID 2852 wrote to memory of 2936 2852 svchost.exe 40 PID 2936 wrote to memory of 2764 2936 cmd.exe 42 PID 2936 wrote to memory of 2764 2936 cmd.exe 42 PID 2936 wrote to memory of 2764 2936 cmd.exe 42 PID 2852 wrote to memory of 1548 2852 svchost.exe 48 PID 2852 wrote to memory of 1548 2852 svchost.exe 48 PID 2852 wrote to memory of 1548 2852 svchost.exe 48 -
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\Antivirus.exe"C:\Users\Admin\AppData\Local\Temp\Antivirus.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3028 -
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:2852 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2676 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2608
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2956
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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:2820 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2920
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2980
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2936 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2764
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\hehehe.txt3⤵
- Opens file in notepad (likely ransom note)
PID:1548
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2060
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2428
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2760
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:1988
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C:\Program Files\Microsoft Games\solitaire\solitaire.exe"C:\Program Files\Microsoft Games\solitaire\solitaire.exe"1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
PID:3000
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x5801⤵
- Suspicious use of AdjustPrivilegeToken
PID:2340
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
52B
MD5f8f5b009780aaaed87e3da3eac18755f
SHA11139582169a36844b8a637bdff2c99e5e187f779
SHA256f0b0870127af4f58da5dbc9c87bb5f63284c56d471647437dabff5bd051217c7
SHA512355107f39f82d6f01aeba045b74bb37716374ba710e0f895b5a98a531a8133b601aba830dbfbf3650495b8780455c6933cc0502c3832733e2005f298b51bd7af
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Filesize
111KB
MD5df1ce61fb4869963a1e95a917adef9d0
SHA1bcf132651a5bd948e758441e4733519d1502c8bf
SHA256e58bf0a81866c21e25dbe8f85fd74304259be3e1b53019f857c2354e23f71b1e
SHA512d2867e1b00900098674f1a87653a9f016911649162c66f0eab67336f758a6611a497bc21a6cbe336bbc2464212bfec59e991b99aa92777ad2250e72b4e17888b
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0