Overview
overview
10Static
static
10TrojanRans...29.exe
windows7-x64
10TrojanRans...29.exe
windows10-2004-x64
10source/Bat...er.exe
windows7-x64
5source/Bat...er.exe
windows10-2004-x64
5source/Bat...lp.chm
windows7-x64
1source/Bat...lp.chm
windows10-2004-x64
1source/Cov29Cry.exe
windows7-x64
10source/Cov29Cry.exe
windows10-2004-x64
10source/Cov...v4.exe
windows7-x64
10source/Cov...v4.exe
windows10-2004-x64
10source/Cov...ry.exe
windows7-x64
10source/Cov...ry.exe
windows10-2004-x64
10source/Cov...en.exe
windows7-x64
3source/Cov...en.exe
windows10-2004-x64
3source/Cov...en.exe
windows7-x64
3source/Cov...en.exe
windows10-2004-x64
3source/Tro...29.bat
windows7-x64
10source/Tro...29.bat
windows10-2004-x64
10source/mbr.exe
windows7-x64
6source/mbr.exe
windows10-2004-x64
6Analysis
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max time kernel
119s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20240708-en -
resource tags
arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system -
submitted
10-12-2024 20:27
Behavioral task
behavioral1
Sample
TrojanRansomCovid29.exe
Resource
win7-20240903-en
windows7-x64
Behavioral task
behavioral2
Sample
TrojanRansomCovid29.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral3
Sample
source/Bat To Exe Converter/Bat_To_Exe_Converter.exe
Resource
win7-20240903-en
windows7-x64
Behavioral task
behavioral4
Sample
source/Bat To Exe Converter/Bat_To_Exe_Converter.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral5
Sample
source/Bat To Exe Converter/help.chm
Resource
win7-20241010-en
windows7-x64
Behavioral task
behavioral6
Sample
source/Bat To Exe Converter/help.chm
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral7
Sample
source/Cov29Cry.exe
Resource
win7-20240708-en
windows7-x64
Behavioral task
behavioral8
Sample
source/Cov29Cry.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral9
Sample
source/Cov29Cry/Chaos Ransomware Builder v4.exe
Resource
win7-20240903-en
windows7-x64
Behavioral task
behavioral10
Sample
source/Cov29Cry/Chaos Ransomware Builder v4.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral11
Sample
source/Cov29Cry/Cov29Cry.exe
Resource
win7-20240729-en
windows7-x64
Behavioral task
behavioral12
Sample
source/Cov29Cry/Cov29Cry.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral13
Sample
source/Cov29LockScreen.exe
Resource
win7-20240903-en
windows7-x64
Behavioral task
behavioral14
Sample
source/Cov29LockScreen.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral15
Sample
source/Cov29LockScreen/Cov29LockScreen.exe
Resource
win7-20240903-en
windows7-x64
Behavioral task
behavioral16
Sample
source/Cov29LockScreen/Cov29LockScreen.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral17
Sample
source/TrojanRansomCovid29.bat
Resource
win7-20240903-en
windows7-x64
Behavioral task
behavioral18
Sample
source/TrojanRansomCovid29.bat
Resource
win10v2004-20241007-en
windows10-2004-x64
Behavioral task
behavioral19
Sample
source/mbr.exe
Resource
win7-20240708-en
windows7-x64
Behavioral task
behavioral20
Sample
source/mbr.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
General
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Target
source/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 3 IoCs
resource yara_rule behavioral7/memory/2092-1-0x0000000000FE0000-0x0000000001000000-memory.dmp family_chaos behavioral7/files/0x00080000000120fb-5.dat family_chaos behavioral7/memory/2548-7-0x0000000000360000-0x0000000000380000-memory.dmp family_chaos -
Chaos family
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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 1120 bcdedit.exe 1868 bcdedit.exe -
pid Process 1352 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 2548 svchost.exe -
Reads user/profile data of web browsers 3 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\Music\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\Accessories\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\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\Pictures\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\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\Favorites\Links\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\Contacts\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\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\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\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\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\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\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\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\Favorites\Links for United States\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3551809350-4263495960-1443967649-1000\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ado2wxtgo.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 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2652 vssadmin.exe -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2548 svchost.exe -
Suspicious behavior: EnumeratesProcesses 9 IoCs
pid Process 2092 Cov29Cry.exe 2092 Cov29Cry.exe 2092 Cov29Cry.exe 2548 svchost.exe 2548 svchost.exe 2548 svchost.exe 2548 svchost.exe 2548 svchost.exe 2548 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2092 Cov29Cry.exe Token: SeDebugPrivilege 2548 svchost.exe Token: SeBackupPrivilege 3048 vssvc.exe Token: SeRestorePrivilege 3048 vssvc.exe Token: SeAuditPrivilege 3048 vssvc.exe Token: SeIncreaseQuotaPrivilege 1108 WMIC.exe Token: SeSecurityPrivilege 1108 WMIC.exe Token: SeTakeOwnershipPrivilege 1108 WMIC.exe Token: SeLoadDriverPrivilege 1108 WMIC.exe Token: SeSystemProfilePrivilege 1108 WMIC.exe Token: SeSystemtimePrivilege 1108 WMIC.exe Token: SeProfSingleProcessPrivilege 1108 WMIC.exe Token: SeIncBasePriorityPrivilege 1108 WMIC.exe Token: SeCreatePagefilePrivilege 1108 WMIC.exe Token: SeBackupPrivilege 1108 WMIC.exe Token: SeRestorePrivilege 1108 WMIC.exe Token: SeShutdownPrivilege 1108 WMIC.exe Token: SeDebugPrivilege 1108 WMIC.exe Token: SeSystemEnvironmentPrivilege 1108 WMIC.exe Token: SeRemoteShutdownPrivilege 1108 WMIC.exe Token: SeUndockPrivilege 1108 WMIC.exe Token: SeManageVolumePrivilege 1108 WMIC.exe Token: 33 1108 WMIC.exe Token: 34 1108 WMIC.exe Token: 35 1108 WMIC.exe Token: SeIncreaseQuotaPrivilege 1108 WMIC.exe Token: SeSecurityPrivilege 1108 WMIC.exe Token: SeTakeOwnershipPrivilege 1108 WMIC.exe Token: SeLoadDriverPrivilege 1108 WMIC.exe Token: SeSystemProfilePrivilege 1108 WMIC.exe Token: SeSystemtimePrivilege 1108 WMIC.exe Token: SeProfSingleProcessPrivilege 1108 WMIC.exe Token: SeIncBasePriorityPrivilege 1108 WMIC.exe Token: SeCreatePagefilePrivilege 1108 WMIC.exe Token: SeBackupPrivilege 1108 WMIC.exe Token: SeRestorePrivilege 1108 WMIC.exe Token: SeShutdownPrivilege 1108 WMIC.exe Token: SeDebugPrivilege 1108 WMIC.exe Token: SeSystemEnvironmentPrivilege 1108 WMIC.exe Token: SeRemoteShutdownPrivilege 1108 WMIC.exe Token: SeUndockPrivilege 1108 WMIC.exe Token: SeManageVolumePrivilege 1108 WMIC.exe Token: 33 1108 WMIC.exe Token: 34 1108 WMIC.exe Token: 35 1108 WMIC.exe Token: SeBackupPrivilege 1980 wbengine.exe Token: SeRestorePrivilege 1980 wbengine.exe Token: SeSecurityPrivilege 1980 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2092 wrote to memory of 2548 2092 Cov29Cry.exe 30 PID 2092 wrote to memory of 2548 2092 Cov29Cry.exe 30 PID 2092 wrote to memory of 2548 2092 Cov29Cry.exe 30 PID 2548 wrote to memory of 2612 2548 svchost.exe 31 PID 2548 wrote to memory of 2612 2548 svchost.exe 31 PID 2548 wrote to memory of 2612 2548 svchost.exe 31 PID 2612 wrote to memory of 2652 2612 cmd.exe 33 PID 2612 wrote to memory of 2652 2612 cmd.exe 33 PID 2612 wrote to memory of 2652 2612 cmd.exe 33 PID 2612 wrote to memory of 1108 2612 cmd.exe 37 PID 2612 wrote to memory of 1108 2612 cmd.exe 37 PID 2612 wrote to memory of 1108 2612 cmd.exe 37 PID 2548 wrote to memory of 604 2548 svchost.exe 39 PID 2548 wrote to memory of 604 2548 svchost.exe 39 PID 2548 wrote to memory of 604 2548 svchost.exe 39 PID 604 wrote to memory of 1120 604 cmd.exe 41 PID 604 wrote to memory of 1120 604 cmd.exe 41 PID 604 wrote to memory of 1120 604 cmd.exe 41 PID 604 wrote to memory of 1868 604 cmd.exe 42 PID 604 wrote to memory of 1868 604 cmd.exe 42 PID 604 wrote to memory of 1868 604 cmd.exe 42 PID 2548 wrote to memory of 2788 2548 svchost.exe 43 PID 2548 wrote to memory of 2788 2548 svchost.exe 43 PID 2548 wrote to memory of 2788 2548 svchost.exe 43 PID 2788 wrote to memory of 1352 2788 cmd.exe 45 PID 2788 wrote to memory of 1352 2788 cmd.exe 45 PID 2788 wrote to memory of 1352 2788 cmd.exe 45 PID 2548 wrote to memory of 1784 2548 svchost.exe 49 PID 2548 wrote to memory of 1784 2548 svchost.exe 49 PID 2548 wrote to memory of 1784 2548 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\source\Cov29Cry.exe"C:\Users\Admin\AppData\Local\Temp\source\Cov29Cry.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2092 -
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:2548 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2612 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2652
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1108
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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:604 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:1120
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1868
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2788 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1352
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\covid29-is-here.txt3⤵PID:1784
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3048
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1980
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2492
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:1520
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