blackbasta | ca0273c55507c3aae95539812c2c5d9bbdc80deb8e714360fe4bcc65d257aeb0

Analysis

max time kernel
166s
max time network
129s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
26-03-2024 12:59

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General

Target

1391c20a26f248f7c602f20096bf1886cfe7e4d151602a1258a9bbe7c02c1c80.dll
Size

524KB
MD5

20d03f8272648fa3fd31e222b8e2220f
SHA1

ac20624e8aff3d4f9c42a8e2ddd493250e631f47
SHA256

1391c20a26f248f7c602f20096bf1886cfe7e4d151602a1258a9bbe7c02c1c80
SHA512

3bcfde35141671b4de022ae2423d020e53de35075c9a2c0a2dde45dc993364543af443dc97e6d3cc96c9a1d34533d6adb50c2495a23b5c4de97f64b3176ebd70
SSDEEP

12288:SwCt9ZABL6wADs7yjyYTW3nMxIg/NmGta1WeGcvc4OulNI:AHUADs+jVW3nMxIKMOa1Wpecule

Score

10^/10

blackbasta ransomware

Malware Config

Extracted

Path

C:\ProgramData\readme.txt

Ransom Note

Your data are stolen and encrypted The data will be published on TOR website if you do not pay the ransom You can contact us and decrypt one file for free on this TOR site (you should download and install TOR browser first https://torproject.org) https://aazsbsgya565vlu2c6bzy6yfiebkcbtvvcytvolt33s77xypi7nypxyd.onion/ Your company id for log in: 41bdf082-8936-4e21-9f70-5446160a730f

URLs

https://aazsbsgya565vlu2c6bzy6yfiebkcbtvvcytvolt33s77xypi7nypxyd.onion/

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
T1070.004

Inhibit System Recovery
T1490
Renames multiple (208) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2461186416-2307104501-1787948496-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\dlaksjdoiwq.jpg"	rundll32.exe

Drops file in Program Files directory 64 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Internet Explorer\F12.dll	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\perfcore.dll	rundll32.exe
File created	C:\Program Files\Microsoft Games\Solitaire\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\api-ms-win-crt-string-l1-1-0.dll	rundll32.exe
File opened for modification	C:\Program Files\7-Zip\History.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\api-ms-win-core-file-l2-1-0.dll	rundll32.exe
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\DVD Maker\audiodepthconverter.ax	rundll32.exe
File created	C:\Program Files\Common Files\SpeechEngines\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\7-Zip\7zCon.sfx	rundll32.exe
File opened for modification	C:\Program Files\DVD Maker\DVDMaker.exe	rundll32.exe
File opened for modification	C:\Program Files\ReadSubmit.ppsm	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\sqmapi.dll	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\api-ms-win-crt-private-l1-1-0.dll	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\firefox.exe.sig	rundll32.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\ExtExport.exe	rundll32.exe
File created	C:\Program Files\Internet Explorer\images\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\mozglue.dll	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\nssckbi.dll	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\Timeline.dll	rundll32.exe
File created	C:\Program Files (x86)\Reference Assemblies\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\DisableRemove.au	rundll32.exe
File opened for modification	C:\Program Files\RestartRead.m1v	rundll32.exe
File opened for modification	C:\Program Files\TestClear.mpv2	rundll32.exe
File created	C:\Program Files\Internet Explorer\ja-JP\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\7-Zip\License.txt	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\ielowutil.exe	rundll32.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\defaultagent_localized.ini	rundll32.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\F12Tools.dll	rundll32.exe
File created	C:\Program Files\Microsoft Games\FreeCell\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\api-ms-win-crt-utility-l1-1-0.dll	rundll32.exe
File created	C:\Program Files (x86)\Common Files\Services\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\libEGL.dll	rundll32.exe
File opened for modification	C:\Program Files\DVD Maker\rtstreamsink.ax	rundll32.exe
File created	C:\Program Files (x86)\Common Files\microsoft shared\readme.txt	rundll32.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\iedvtool.dll	rundll32.exe
File created	C:\Program Files\DVD Maker\en-US\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\RenameComplete.jpeg	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\api-ms-win-core-localization-l1-2-0.dll	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\crashreporter.exe	rundll32.exe
File created	C:\Program Files (x86)\Internet Explorer\de-DE\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\DisableSuspend.odp	rundll32.exe
File created	C:\Program Files\DVD Maker\fr-FR\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\pdm.dll	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\Timeline.cpu.xml	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\Timeline_is.dll	rundll32.exe
File created	C:\Program Files\Microsoft Games\Minesweeper\readme.txt	rundll32.exe
File created	C:\Program Files\Java\readme.txt	rundll32.exe
File created	C:\Program Files\Internet Explorer\fr-FR\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\api-ms-win-crt-stdio-l1-1-0.dll	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\osclientcerts.dll	rundll32.exe
File opened for modification	C:\Program Files\InitializeAssert.mhtml	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\iediagcmd.exe	rundll32.exe
File created	C:\Program Files\Microsoft Games\Purble Place\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\Accessible.tlb	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\update-settings.ini	rundll32.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\ielowutil.exe	rundll32.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\pdmproxy100.dll	rundll32.exe
File opened for modification	C:\Program Files\WriteStop.xlsm	rundll32.exe
File opened for modification	C:\Program Files\Internet Explorer\MemoryAnalyzer.dll	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\maintenanceservice_installer.exe	rundll32.exe
File opened for modification	C:\Program Files\SubmitDeny.vbs	rundll32.exe
File created	C:\Program Files\7-Zip\Lang\readme.txt	rundll32.exe

Interacts with shadow copies 2 TTPs 2 IoCs

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

ransomware

File Deletion

T1070.004

Inhibit System Recovery

T1490

pid	Process
3028	vssadmin.exe
1332	vssadmin.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.basta\DefaultIcon	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.basta	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.basta\DefaultIcon\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\fkdjsadasd.ico"	rundll32.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	2576	vssvc.exe
Token: SeRestorePrivilege	2576	vssvc.exe
Token: SeAuditPrivilege	2576	vssvc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 3056 wrote to memory of 1224	3056	rundll32.exe	27
PID 1224 wrote to memory of 2116	1224	rundll32.exe	28
PID 1224 wrote to memory of 2116	1224	rundll32.exe	28
PID 1224 wrote to memory of 2116	1224	rundll32.exe	28
PID 1224 wrote to memory of 2116	1224	rundll32.exe	28
PID 2116 wrote to memory of 3028	2116	cmd.exe	30
PID 2116 wrote to memory of 3028	2116	cmd.exe	30
PID 2116 wrote to memory of 3028	2116	cmd.exe	30
PID 2116 wrote to memory of 3028	2116	cmd.exe	30
PID 1224 wrote to memory of 1936	1224	rundll32.exe	35
PID 1224 wrote to memory of 1936	1224	rundll32.exe	35
PID 1224 wrote to memory of 1936	1224	rundll32.exe	35
PID 1224 wrote to memory of 1936	1224	rundll32.exe	35
PID 1936 wrote to memory of 1332	1936	cmd.exe	37
PID 1936 wrote to memory of 1332	1936	cmd.exe	37
PID 1936 wrote to memory of 1332	1936	cmd.exe	37
PID 1936 wrote to memory of 1332	1936	cmd.exe	37

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

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\1391c20a26f248f7c602f20096bf1886cfe7e4d151602a1258a9bbe7c02c1c80.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\1391c20a26f248f7c602f20096bf1886cfe7e4d151602a1258a9bbe7c02c1c80.dll,#1
  2⤵
  - Sets desktop wallpaper using registry
  - Drops file in Program Files directory
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1224
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c C:\Windows\SysNative\vssadmin.exe delete shadows /all /quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2116
  - - C:\Windows\system32\vssadmin.exe
      C:\Windows\SysNative\vssadmin.exe delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:3028
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c C:\Windows\System32\vssadmin.exe delete shadows /all /quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1936
  - - C:\Windows\SysWOW64\vssadmin.exe
      C:\Windows\System32\vssadmin.exe delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:1332

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2576

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact