Analysis
-
max time kernel
118s -
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, 11:04
Behavioral task
behavioral1
Sample
8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe
Resource
win7-20230831-en
Behavioral task
behavioral2
Sample
8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe
Resource
win10v2004-20230831-en
General
-
Target
8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe
-
Size
109KB
-
MD5
b3fe2335d478192118f666c1afb912e2
-
SHA1
7589ddded869857c8aefe416f984e68a3c8da99b
-
SHA256
8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704
-
SHA512
542eba645bc8237470e9eb6bac47462c91737da183321a3a357295c1d05e0bd7a511073280cfc2f562042e7d10b0b907ac4cc852882e415ecf25556488160bb6
-
SSDEEP
3072:9oPEplr9YpH1NJ3c2bJf+xN9iQhZhtghulJI2saIrnrsK:dr9YpHDbJENIQhZhGuU2saIjY
Malware Config
Extracted
C:\Users\Admin\Documents\read_me.txt
chaos
Signatures
-
Chaos
Ransomware family first seen in June 2021.
-
Chaos Ransomware 4 IoCs
resource yara_rule behavioral1/memory/320-0-0x0000000000BE0000-0x0000000000C02000-memory.dmp family_chaos behavioral1/files/0x00070000000120be-5.dat family_chaos behavioral1/memory/2128-7-0x0000000000340000-0x0000000000362000-memory.dmp family_chaos behavioral1/files/0x00070000000120be-6.dat family_chaos -
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
-
Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
pid Process 1116 bcdedit.exe 1824 bcdedit.exe -
Renames multiple (202) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
-
pid Process 1840 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\read_me.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 2128 svchost.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
-
Drops desktop.ini file(s) 34 IoCs
description ioc Process File opened for modification C:\Users\Admin\Downloads\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\Public\Documents\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 C:\Users\Admin\Desktop\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\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\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\Public\Videos\Sample Videos\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\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\Internet Explorer\Quick Launch\User Pinned\TaskBar\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 F:\$RECYCLE.BIN\S-1-5-21-607259312-1573743425-2763420908-1000\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\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\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\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\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\AppData\Roaming\Microsoft\Windows\Libraries\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ex7nqzo9q.jpg" svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
-
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2844 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1776 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2128 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 320 8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 320 8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 2128 svchost.exe 2128 svchost.exe 2128 svchost.exe 2128 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 320 8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe Token: SeDebugPrivilege 2128 svchost.exe Token: SeBackupPrivilege 1460 vssvc.exe Token: SeRestorePrivilege 1460 vssvc.exe Token: SeAuditPrivilege 1460 vssvc.exe Token: SeIncreaseQuotaPrivilege 596 WMIC.exe Token: SeSecurityPrivilege 596 WMIC.exe Token: SeTakeOwnershipPrivilege 596 WMIC.exe Token: SeLoadDriverPrivilege 596 WMIC.exe Token: SeSystemProfilePrivilege 596 WMIC.exe Token: SeSystemtimePrivilege 596 WMIC.exe Token: SeProfSingleProcessPrivilege 596 WMIC.exe Token: SeIncBasePriorityPrivilege 596 WMIC.exe Token: SeCreatePagefilePrivilege 596 WMIC.exe Token: SeBackupPrivilege 596 WMIC.exe Token: SeRestorePrivilege 596 WMIC.exe Token: SeShutdownPrivilege 596 WMIC.exe Token: SeDebugPrivilege 596 WMIC.exe Token: SeSystemEnvironmentPrivilege 596 WMIC.exe Token: SeRemoteShutdownPrivilege 596 WMIC.exe Token: SeUndockPrivilege 596 WMIC.exe Token: SeManageVolumePrivilege 596 WMIC.exe Token: 33 596 WMIC.exe Token: 34 596 WMIC.exe Token: 35 596 WMIC.exe Token: SeIncreaseQuotaPrivilege 596 WMIC.exe Token: SeSecurityPrivilege 596 WMIC.exe Token: SeTakeOwnershipPrivilege 596 WMIC.exe Token: SeLoadDriverPrivilege 596 WMIC.exe Token: SeSystemProfilePrivilege 596 WMIC.exe Token: SeSystemtimePrivilege 596 WMIC.exe Token: SeProfSingleProcessPrivilege 596 WMIC.exe Token: SeIncBasePriorityPrivilege 596 WMIC.exe Token: SeCreatePagefilePrivilege 596 WMIC.exe Token: SeBackupPrivilege 596 WMIC.exe Token: SeRestorePrivilege 596 WMIC.exe Token: SeShutdownPrivilege 596 WMIC.exe Token: SeDebugPrivilege 596 WMIC.exe Token: SeSystemEnvironmentPrivilege 596 WMIC.exe Token: SeRemoteShutdownPrivilege 596 WMIC.exe Token: SeUndockPrivilege 596 WMIC.exe Token: SeManageVolumePrivilege 596 WMIC.exe Token: 33 596 WMIC.exe Token: 34 596 WMIC.exe Token: 35 596 WMIC.exe Token: SeBackupPrivilege 2068 wbengine.exe Token: SeRestorePrivilege 2068 wbengine.exe Token: SeSecurityPrivilege 2068 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 320 wrote to memory of 2128 320 8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 28 PID 320 wrote to memory of 2128 320 8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 28 PID 320 wrote to memory of 2128 320 8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe 28 PID 2128 wrote to memory of 2616 2128 svchost.exe 30 PID 2128 wrote to memory of 2616 2128 svchost.exe 30 PID 2128 wrote to memory of 2616 2128 svchost.exe 30 PID 2616 wrote to memory of 2844 2616 cmd.exe 32 PID 2616 wrote to memory of 2844 2616 cmd.exe 32 PID 2616 wrote to memory of 2844 2616 cmd.exe 32 PID 2616 wrote to memory of 596 2616 cmd.exe 36 PID 2616 wrote to memory of 596 2616 cmd.exe 36 PID 2616 wrote to memory of 596 2616 cmd.exe 36 PID 2128 wrote to memory of 296 2128 svchost.exe 38 PID 2128 wrote to memory of 296 2128 svchost.exe 38 PID 2128 wrote to memory of 296 2128 svchost.exe 38 PID 296 wrote to memory of 1116 296 cmd.exe 40 PID 296 wrote to memory of 1116 296 cmd.exe 40 PID 296 wrote to memory of 1116 296 cmd.exe 40 PID 296 wrote to memory of 1824 296 cmd.exe 41 PID 296 wrote to memory of 1824 296 cmd.exe 41 PID 296 wrote to memory of 1824 296 cmd.exe 41 PID 2128 wrote to memory of 764 2128 svchost.exe 42 PID 2128 wrote to memory of 764 2128 svchost.exe 42 PID 2128 wrote to memory of 764 2128 svchost.exe 42 PID 764 wrote to memory of 1840 764 cmd.exe 44 PID 764 wrote to memory of 1840 764 cmd.exe 44 PID 764 wrote to memory of 1840 764 cmd.exe 44 PID 2128 wrote to memory of 1776 2128 svchost.exe 48 PID 2128 wrote to memory of 1776 2128 svchost.exe 48 PID 2128 wrote to memory of 1776 2128 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.
-
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
-
C:\Users\Admin\AppData\Local\Temp\8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe"C:\Users\Admin\AppData\Local\Temp\8901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:320 -
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:2128 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2616 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2844
-
-
C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:596
-
-
-
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:296 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:1116
-
-
C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1824
-
-
-
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:764 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1840
-
-
-
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:1776
-
-
-
C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1460
-
C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2068
-
C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2700
-
C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2288
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740
-
Filesize
109KB
MD5b3fe2335d478192118f666c1afb912e2
SHA17589ddded869857c8aefe416f984e68a3c8da99b
SHA2568901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704
SHA512542eba645bc8237470e9eb6bac47462c91737da183321a3a357295c1d05e0bd7a511073280cfc2f562042e7d10b0b907ac4cc852882e415ecf25556488160bb6
-
Filesize
109KB
MD5b3fe2335d478192118f666c1afb912e2
SHA17589ddded869857c8aefe416f984e68a3c8da99b
SHA2568901d677b018bce45fea80e396e5d02543f9c1bd0ee35e10269aba3a04ef9704
SHA512542eba645bc8237470e9eb6bac47462c91737da183321a3a357295c1d05e0bd7a511073280cfc2f562042e7d10b0b907ac4cc852882e415ecf25556488160bb6
-
Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740