blackbasta | 5d2204f3a20e163120f52a2e3595db19890050b2faa96c6cba6b094b0a52b0aa

Reason

Machine shutdown

General

Target

BlackBasta.exe
Size

563KB
MD5

3f400f30415941348af21d515a2fc6a3
SHA1

bd0bf9c987288ca434221d7d81c54a47e913600a
SHA256

5d2204f3a20e163120f52a2e3595db19890050b2faa96c6cba6b094b0a52b0aa
SHA512

0d4c3ee8807bbbf635ce2d1ce1b747c23cc2724ff999580169e5514c7c97109083bea169bd6a5f8be35f3b679bb8446839fcc7a38f78503658eda306bec69154
SSDEEP

12288:TFx0B/O7JxPzW9JPlHKtxYRkG7zLfpXE6SbJ:Rx7zW9JPlGskG1v

Score

10^/10

blackbasta evasion ransomware

Malware Config

Signatures

Black Basta
A ransomware family targeting Windows and Linux ESXi first seen in February 2022.
ransomware blackbasta
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Modifies boot configuration data using bcdedit 1 TTPs 1 IoCs

ransomware evasion

Inhibit System Recovery

T1490

pid	Process
3552	bcdedit.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-640001698-3754512395-3275565439-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\dlaksjdoiwq.jpg"	BlackBasta.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Interacts with shadow copies 2 TTPs 2 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1107

Inhibit System Recovery

T1490

pid	Process
4316	vssadmin.exe
2112	vssadmin.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "1"	LogonUI.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.basta\DefaultIcon	BlackBasta.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.basta	BlackBasta.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.basta\DefaultIcon\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\fkdjsadasd.ico"	BlackBasta.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeBackupPrivilege	4884	vssvc.exe
Token: SeRestorePrivilege	4884	vssvc.exe
Token: SeAuditPrivilege	4884	vssvc.exe
Token: SeShutdownPrivilege	3920	shutdown.exe
Token: SeRemoteShutdownPrivilege	3920	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3108	LogonUI.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 4156 wrote to memory of 4112	4156	BlackBasta.exe	67
PID 4156 wrote to memory of 4112	4156	BlackBasta.exe	67
PID 4156 wrote to memory of 4112	4156	BlackBasta.exe	67
PID 4112 wrote to memory of 4316	4112	cmd.exe	69
PID 4112 wrote to memory of 4316	4112	cmd.exe	69
PID 4156 wrote to memory of 1632	4156	BlackBasta.exe	72
PID 4156 wrote to memory of 1632	4156	BlackBasta.exe	72
PID 4156 wrote to memory of 1632	4156	BlackBasta.exe	72
PID 1632 wrote to memory of 2112	1632	cmd.exe	74
PID 1632 wrote to memory of 2112	1632	cmd.exe	74
PID 1632 wrote to memory of 2112	1632	cmd.exe	74
PID 4156 wrote to memory of 3100	4156	BlackBasta.exe	75
PID 4156 wrote to memory of 3100	4156	BlackBasta.exe	75
PID 4156 wrote to memory of 3100	4156	BlackBasta.exe	75
PID 4156 wrote to memory of 2412	4156	BlackBasta.exe	78
PID 4156 wrote to memory of 2412	4156	BlackBasta.exe	78
PID 4156 wrote to memory of 2412	4156	BlackBasta.exe	78
PID 4156 wrote to memory of 1560	4156	BlackBasta.exe	80
PID 4156 wrote to memory of 1560	4156	BlackBasta.exe	80
PID 4156 wrote to memory of 1560	4156	BlackBasta.exe	80
PID 1560 wrote to memory of 3552	1560	cmd.exe	82
PID 1560 wrote to memory of 3552	1560	cmd.exe	82
PID 4156 wrote to memory of 3476	4156	BlackBasta.exe	83
PID 4156 wrote to memory of 3476	4156	BlackBasta.exe	83
PID 4156 wrote to memory of 3476	4156	BlackBasta.exe	83
PID 3476 wrote to memory of 3920	3476	cmd.exe	85
PID 3476 wrote to memory of 3920	3476	cmd.exe	85
PID 3476 wrote to memory of 3920	3476	cmd.exe	85

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\BlackBasta.exe
"C:\Users\Admin\AppData\Local\Temp\BlackBasta.exe"
1⤵
- Sets desktop wallpaper using registry
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4156
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Windows\SysNative\vssadmin.exe delete shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4112
- - C:\Windows\System32\vssadmin.exe
    C:\Windows\SysNative\vssadmin.exe delete shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:4316
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Windows\System32\vssadmin.exe delete shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1632
- - C:\Windows\SysWOW64\vssadmin.exe
    C:\Windows\System32\vssadmin.exe delete shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:2112
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c bcdedit /set safeboot network
  2⤵
  PID:3100
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Windows\System32\bcdedit.exe /set safeboot network
  2⤵
  PID:2412
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Windows\SysNative\bcdedit.exe /set safeboot network
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1560
- - C:\Windows\System32\bcdedit.exe
    C:\Windows\SysNative\bcdedit.exe /set safeboot network
    3⤵
    - Modifies boot configuration data using bcdedit
    PID:3552
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C shutdown -r -f -t 0
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3476
- - C:\Windows\SysWOW64\shutdown.exe
    shutdown -r -f -t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:3920

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4884

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ac8855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3108