Overview
overview
10Static
static
10TrojanRans...29.exe
windows11-21h2-x64
10source/Bat...er.exe
windows11-21h2-x64
7source/Bat...lp.chm
windows11-21h2-x64
1source/Cov29Cry.exe
windows11-21h2-x64
10source/Cov...v4.exe
windows11-21h2-x64
10source/Cov...ry.exe
windows11-21h2-x64
10source/Cov...en.exe
windows11-21h2-x64
3source/Cov...en.exe
windows11-21h2-x64
3source/Tro...29.bat
windows11-21h2-x64
source/mbr.exe
windows11-21h2-x64
6Analysis
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max time kernel
1667s -
max time network
1162s -
platform
windows11-21h2_x64 -
resource
win11-20240802-en -
resource tags
arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system -
submitted
05-08-2024 08:32
Behavioral task
behavioral1
Sample
TrojanRansomCovid29.exe
Resource
win11-20240802-en
chaosbootkitdefense_evasiondiscoveryevasionexecutionimpactpersistenceransomwarespywarestealertrojanupx
windows11-21h2-x64
30 signatures
1800 seconds
Behavioral task
behavioral2
Sample
source/Bat To Exe Converter/Bat_To_Exe_Converter.exe
Resource
win11-20240802-en
windows11-21h2-x64
2 signatures
1800 seconds
Behavioral task
behavioral3
Sample
source/Bat To Exe Converter/help.chm
Resource
win11-20240802-en
windows11-21h2-x64
1 signatures
1800 seconds
Behavioral task
behavioral4
Sample
source/Cov29Cry.exe
Resource
win11-20240802-en
windows11-21h2-x64
20 signatures
1800 seconds
Behavioral task
behavioral5
Sample
source/Cov29Cry/Chaos Ransomware Builder v4.exe
Resource
win11-20240802-en
windows11-21h2-x64
4 signatures
1800 seconds
Behavioral task
behavioral6
Sample
source/Cov29Cry/Cov29Cry.exe
Resource
win11-20240802-en
windows11-21h2-x64
20 signatures
1800 seconds
Behavioral task
behavioral7
Sample
source/Cov29LockScreen.exe
Resource
win11-20240802-en
windows11-21h2-x64
2 signatures
1800 seconds
Behavioral task
behavioral8
Sample
source/Cov29LockScreen/Cov29LockScreen.exe
Resource
win11-20240802-en
windows11-21h2-x64
2 signatures
1800 seconds
Behavioral task
behavioral9
Sample
source/TrojanRansomCovid29.bat
Resource
win11-20240802-en
windows11-21h2-x64
30 signatures
1800 seconds
Behavioral task
behavioral10
Sample
source/mbr.exe
Resource
win11-20240802-en
windows11-21h2-x64
2 signatures
1800 seconds
General
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Target
source/Cov29Cry/Cov29Cry.exe
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Size
103KB
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MD5
8bcd083e16af6c15e14520d5a0bd7e6a
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SHA1
c4d2f35d1fdb295db887f31bbc9237ac9263d782
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SHA256
b4f78ff66dc3f5f8ddd694166e6b596d533830792f9b5f1634d3f5f17d6a884a
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SHA512
35999577be0626b50eeab65b493d48af2ab42b699f7241d2780647bf7d72069216d99f5f708337a109e79b9c9229613b8341f44c6d96245fd1f3ac9f05814d6a
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SSDEEP
3072:H3kyzZr9SE9RmXjSPjXvyT2cQf8WhjTRqvM:N1r9SELZDv25iVly
Malware Config
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 2 IoCs
resource yara_rule behavioral6/memory/2664-1-0x0000000000EE0000-0x0000000000F00000-memory.dmp family_chaos behavioral6/files/0x000d000000025de1-6.dat family_chaos -
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 1976 bcdedit.exe 2764 bcdedit.exe -
pid Process 3336 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\covid29-is-here.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 4520 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 F:\$RECYCLE.BIN\S-1-5-21-661032028-162657920-1226909816-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\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\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\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\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\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\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\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\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\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\Public\Videos\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\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\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\Pictures\Camera Roll\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\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\SendTo\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-661032028-162657920-1226909816-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\jyvt7hq4t.jpg" svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks SCSI registry key(s) 3 TTPs 4 IoCs
SCSI information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_WDC&PROD_WDS100T2B0A\4&215468A5&0&000000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName vds.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_QEMU&PROD_QEMU_DVD-ROM\4&215468A5&0&010000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName vds.exe -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 3372 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-661032028-162657920-1226909816-1000_Classes\Local Settings svchost.exe -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 4520 svchost.exe -
Suspicious behavior: EnumeratesProcesses 39 IoCs
pid Process 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 2664 Cov29Cry.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe 4520 svchost.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 2664 Cov29Cry.exe Token: SeDebugPrivilege 4520 svchost.exe Token: SeBackupPrivilege 3176 vssvc.exe Token: SeRestorePrivilege 3176 vssvc.exe Token: SeAuditPrivilege 3176 vssvc.exe Token: SeIncreaseQuotaPrivilege 4900 WMIC.exe Token: SeSecurityPrivilege 4900 WMIC.exe Token: SeTakeOwnershipPrivilege 4900 WMIC.exe Token: SeLoadDriverPrivilege 4900 WMIC.exe Token: SeSystemProfilePrivilege 4900 WMIC.exe Token: SeSystemtimePrivilege 4900 WMIC.exe Token: SeProfSingleProcessPrivilege 4900 WMIC.exe Token: SeIncBasePriorityPrivilege 4900 WMIC.exe Token: SeCreatePagefilePrivilege 4900 WMIC.exe Token: SeBackupPrivilege 4900 WMIC.exe Token: SeRestorePrivilege 4900 WMIC.exe Token: SeShutdownPrivilege 4900 WMIC.exe Token: SeDebugPrivilege 4900 WMIC.exe Token: SeSystemEnvironmentPrivilege 4900 WMIC.exe Token: SeRemoteShutdownPrivilege 4900 WMIC.exe Token: SeUndockPrivilege 4900 WMIC.exe Token: SeManageVolumePrivilege 4900 WMIC.exe Token: 33 4900 WMIC.exe Token: 34 4900 WMIC.exe Token: 35 4900 WMIC.exe Token: 36 4900 WMIC.exe Token: SeIncreaseQuotaPrivilege 4900 WMIC.exe Token: SeSecurityPrivilege 4900 WMIC.exe Token: SeTakeOwnershipPrivilege 4900 WMIC.exe Token: SeLoadDriverPrivilege 4900 WMIC.exe Token: SeSystemProfilePrivilege 4900 WMIC.exe Token: SeSystemtimePrivilege 4900 WMIC.exe Token: SeProfSingleProcessPrivilege 4900 WMIC.exe Token: SeIncBasePriorityPrivilege 4900 WMIC.exe Token: SeCreatePagefilePrivilege 4900 WMIC.exe Token: SeBackupPrivilege 4900 WMIC.exe Token: SeRestorePrivilege 4900 WMIC.exe Token: SeShutdownPrivilege 4900 WMIC.exe Token: SeDebugPrivilege 4900 WMIC.exe Token: SeSystemEnvironmentPrivilege 4900 WMIC.exe Token: SeRemoteShutdownPrivilege 4900 WMIC.exe Token: SeUndockPrivilege 4900 WMIC.exe Token: SeManageVolumePrivilege 4900 WMIC.exe Token: 33 4900 WMIC.exe Token: 34 4900 WMIC.exe Token: 35 4900 WMIC.exe Token: 36 4900 WMIC.exe Token: SeBackupPrivilege 2660 wbengine.exe Token: SeRestorePrivilege 2660 wbengine.exe Token: SeSecurityPrivilege 2660 wbengine.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 2664 wrote to memory of 4520 2664 Cov29Cry.exe 82 PID 2664 wrote to memory of 4520 2664 Cov29Cry.exe 82 PID 4520 wrote to memory of 1236 4520 svchost.exe 85 PID 4520 wrote to memory of 1236 4520 svchost.exe 85 PID 1236 wrote to memory of 3372 1236 cmd.exe 87 PID 1236 wrote to memory of 3372 1236 cmd.exe 87 PID 1236 wrote to memory of 4900 1236 cmd.exe 91 PID 1236 wrote to memory of 4900 1236 cmd.exe 91 PID 4520 wrote to memory of 680 4520 svchost.exe 94 PID 4520 wrote to memory of 680 4520 svchost.exe 94 PID 680 wrote to memory of 1976 680 cmd.exe 96 PID 680 wrote to memory of 1976 680 cmd.exe 96 PID 680 wrote to memory of 2764 680 cmd.exe 97 PID 680 wrote to memory of 2764 680 cmd.exe 97 PID 4520 wrote to memory of 3544 4520 svchost.exe 98 PID 4520 wrote to memory of 3544 4520 svchost.exe 98 PID 3544 wrote to memory of 3336 3544 cmd.exe 100 PID 3544 wrote to memory of 3336 3544 cmd.exe 100 PID 4520 wrote to memory of 3232 4520 svchost.exe 105 PID 4520 wrote to memory of 3232 4520 svchost.exe 105 -
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\source\Cov29Cry\Cov29Cry.exe"C:\Users\Admin\AppData\Local\Temp\source\Cov29Cry\Cov29Cry.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2664 -
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
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4520 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1236 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:3372
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:4900
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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:680 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:1976
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2764
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:3544 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:3336
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\covid29-is-here.txt3⤵PID:3232
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3176
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2660
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:5112
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:4024
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
103KB
MD58bcd083e16af6c15e14520d5a0bd7e6a
SHA1c4d2f35d1fdb295db887f31bbc9237ac9263d782
SHA256b4f78ff66dc3f5f8ddd694166e6b596d533830792f9b5f1634d3f5f17d6a884a
SHA51235999577be0626b50eeab65b493d48af2ab42b699f7241d2780647bf7d72069216d99f5f708337a109e79b9c9229613b8341f44c6d96245fd1f3ac9f05814d6a
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Filesize
861B
MD5c53dee51c26d1d759667c25918d3ed10
SHA1da194c2de15b232811ba9d43a46194d9729507f0
SHA256dd5b3d185ae1809407e7822de4fced945115b48cc33b2950a8da9ebd77a68c52
SHA512da41cef03f1b5f21a1fca2cfbf1b2b180c261a75d391be3a1ba36e8d4d4aefab8db024391bbee06b99de0cb0b8eb8c89f2a304c27e20c0af171b77db33b2d12c