Analysis
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max time kernel
119s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20230831-en -
resource tags
arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system -
submitted
07/09/2023, 16:30
Behavioral task
behavioral1
Sample
JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe
Resource
win7-20230831-en
Behavioral task
behavioral2
Sample
JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe
Resource
win10v2004-20230831-en
General
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Target
JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe
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Size
109KB
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MD5
b3fe2335d478192118f666c1afb912e2
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SHA1
7589ddded869857c8aefe416f984e68a3c8da99b
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SHA256
8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704
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SHA512
542eba645bc8237470e9eb6bac47462c91737da183321a3a357295c1d05e0bd7a511073280cfc2f562042e7d10b0b907ac4cc852882e415ecf25556488160bb6
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SSDEEP
3072:9oPEplr9YpH1NJ3c2bJf+xN9iQhZhtghulJI2saIrnrsK:dr9YpHDbJENIQhZhGuU2saIjY
Malware Config
Extracted
C:\Users\Admin\Documents\read_me.txt
chaos
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 5 IoCs
resource yara_rule behavioral1/memory/2968-0-0x0000000000F70000-0x0000000000F92000-memory.dmp family_chaos behavioral1/files/0x00070000000120e4-5.dat family_chaos behavioral1/memory/1684-7-0x0000000000980000-0x00000000009A2000-memory.dmp family_chaos behavioral1/files/0x00070000000120e4-6.dat family_chaos behavioral1/memory/1684-10-0x0000000000650000-0x00000000006D0000-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 2020 bcdedit.exe 2564 bcdedit.exe -
Renames multiple (213) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 552 wbadmin.exe -
Drops startup file 3 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_me.txt svchost.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 1684 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\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\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\Administrative Tools\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\Music\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\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\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\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System 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\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\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\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-686452656-3203474025-4140627569-1000\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\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Public\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\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\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\Libraries\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\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-686452656-3203474025-4140627569-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\9ddaew68d.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 1584 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2320 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 1684 svchost.exe -
Suspicious behavior: EnumeratesProcesses 5 IoCs
pid Process 2968 JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 2968 JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 1684 svchost.exe 1684 svchost.exe 1684 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2968 JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe Token: SeDebugPrivilege 1684 svchost.exe Token: SeBackupPrivilege 856 vssvc.exe Token: SeRestorePrivilege 856 vssvc.exe Token: SeAuditPrivilege 856 vssvc.exe Token: SeIncreaseQuotaPrivilege 2752 WMIC.exe Token: SeSecurityPrivilege 2752 WMIC.exe Token: SeTakeOwnershipPrivilege 2752 WMIC.exe Token: SeLoadDriverPrivilege 2752 WMIC.exe Token: SeSystemProfilePrivilege 2752 WMIC.exe Token: SeSystemtimePrivilege 2752 WMIC.exe Token: SeProfSingleProcessPrivilege 2752 WMIC.exe Token: SeIncBasePriorityPrivilege 2752 WMIC.exe Token: SeCreatePagefilePrivilege 2752 WMIC.exe Token: SeBackupPrivilege 2752 WMIC.exe Token: SeRestorePrivilege 2752 WMIC.exe Token: SeShutdownPrivilege 2752 WMIC.exe Token: SeDebugPrivilege 2752 WMIC.exe Token: SeSystemEnvironmentPrivilege 2752 WMIC.exe Token: SeRemoteShutdownPrivilege 2752 WMIC.exe Token: SeUndockPrivilege 2752 WMIC.exe Token: SeManageVolumePrivilege 2752 WMIC.exe Token: 33 2752 WMIC.exe Token: 34 2752 WMIC.exe Token: 35 2752 WMIC.exe Token: SeIncreaseQuotaPrivilege 2752 WMIC.exe Token: SeSecurityPrivilege 2752 WMIC.exe Token: SeTakeOwnershipPrivilege 2752 WMIC.exe Token: SeLoadDriverPrivilege 2752 WMIC.exe Token: SeSystemProfilePrivilege 2752 WMIC.exe Token: SeSystemtimePrivilege 2752 WMIC.exe Token: SeProfSingleProcessPrivilege 2752 WMIC.exe Token: SeIncBasePriorityPrivilege 2752 WMIC.exe Token: SeCreatePagefilePrivilege 2752 WMIC.exe Token: SeBackupPrivilege 2752 WMIC.exe Token: SeRestorePrivilege 2752 WMIC.exe Token: SeShutdownPrivilege 2752 WMIC.exe Token: SeDebugPrivilege 2752 WMIC.exe Token: SeSystemEnvironmentPrivilege 2752 WMIC.exe Token: SeRemoteShutdownPrivilege 2752 WMIC.exe Token: SeUndockPrivilege 2752 WMIC.exe Token: SeManageVolumePrivilege 2752 WMIC.exe Token: 33 2752 WMIC.exe Token: 34 2752 WMIC.exe Token: 35 2752 WMIC.exe Token: SeBackupPrivilege 2884 wbengine.exe Token: SeRestorePrivilege 2884 wbengine.exe Token: SeSecurityPrivilege 2884 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2968 wrote to memory of 1684 2968 JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 28 PID 2968 wrote to memory of 1684 2968 JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 28 PID 2968 wrote to memory of 1684 2968 JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 28 PID 1684 wrote to memory of 1724 1684 svchost.exe 30 PID 1684 wrote to memory of 1724 1684 svchost.exe 30 PID 1684 wrote to memory of 1724 1684 svchost.exe 30 PID 1724 wrote to memory of 1584 1724 cmd.exe 32 PID 1724 wrote to memory of 1584 1724 cmd.exe 32 PID 1724 wrote to memory of 1584 1724 cmd.exe 32 PID 1724 wrote to memory of 2752 1724 cmd.exe 36 PID 1724 wrote to memory of 2752 1724 cmd.exe 36 PID 1724 wrote to memory of 2752 1724 cmd.exe 36 PID 1684 wrote to memory of 2840 1684 svchost.exe 38 PID 1684 wrote to memory of 2840 1684 svchost.exe 38 PID 1684 wrote to memory of 2840 1684 svchost.exe 38 PID 2840 wrote to memory of 2020 2840 cmd.exe 40 PID 2840 wrote to memory of 2020 2840 cmd.exe 40 PID 2840 wrote to memory of 2020 2840 cmd.exe 40 PID 2840 wrote to memory of 2564 2840 cmd.exe 41 PID 2840 wrote to memory of 2564 2840 cmd.exe 41 PID 2840 wrote to memory of 2564 2840 cmd.exe 41 PID 1684 wrote to memory of 2848 1684 svchost.exe 42 PID 1684 wrote to memory of 2848 1684 svchost.exe 42 PID 1684 wrote to memory of 2848 1684 svchost.exe 42 PID 2848 wrote to memory of 552 2848 cmd.exe 44 PID 2848 wrote to memory of 552 2848 cmd.exe 44 PID 2848 wrote to memory of 552 2848 cmd.exe 44 PID 1684 wrote to memory of 2320 1684 svchost.exe 48 PID 1684 wrote to memory of 2320 1684 svchost.exe 48 PID 1684 wrote to memory of 2320 1684 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\JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe"C:\Users\Admin\AppData\Local\Temp\JC_8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2968 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- 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:1684 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1724 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1584
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2752
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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:2840 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2020
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2564
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2848 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:552
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_me.txt3⤵
- Opens file in notepad (likely ransom note)
PID:2320
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:856
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2884
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2008
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2672
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740
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Filesize
109KB
MD5b3fe2335d478192118f666c1afb912e2
SHA17589ddded869857c8aefe416f984e68a3c8da99b
SHA2568901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704
SHA512542eba645bc8237470e9eb6bac47462c91737da183321a3a357295c1d05e0bd7a511073280cfc2f562042e7d10b0b907ac4cc852882e415ecf25556488160bb6
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Filesize
109KB
MD5b3fe2335d478192118f666c1afb912e2
SHA17589ddded869857c8aefe416f984e68a3c8da99b
SHA2568901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704
SHA512542eba645bc8237470e9eb6bac47462c91737da183321a3a357295c1d05e0bd7a511073280cfc2f562042e7d10b0b907ac4cc852882e415ecf25556488160bb6
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740