blackbasta | ca0273c55507c3aae95539812c2c5d9bbdc80deb8e714360fe4bcc65d257aeb0

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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 (3249) 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

Processes:

rundll32.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-513485977-2495024337-1260977654-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\dlaksjdoiwq.jpg"	rundll32.exe

Drops file in Program Files directory 64 IoCs

Processes:

rundll32.exe

description	ioc	process
File opened for modification	C:\Program Files\Java\jdk-1.8\bin\api-ms-win-crt-runtime-l1-1-0.dll	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Outlook2019VL_MAK_AE-pl.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_Trial-ul-oob.xrm-ms	rundll32.exe
File created	C:\Program Files\Common Files\System\ado\ja-JP\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Document Themes 16\Integral.thmx	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\PersonalR_Retail-ppd.xrm-ms	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\7-Zip\Lang\lij.txt	rundll32.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\bin\api-ms-win-crt-string-l1-1-0.dll	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeStudent2019R_Grace-ul-oob.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\OneNoteVL_KMS_Client-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlusVL_KMS_Client-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ClickToRun\msvcr120.dll	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProfessionalPipcR_OEM_Perp-ul-phn.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.25\api-ms-win-core-datetime-l1-1-0.dll	rundll32.exe
File created	C:\Program Files\Java\jdk-1.8\readme.txt	rundll32.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Java\jre-1.8\lib\jce.jar	rundll32.exe
File created	C:\Program Files\Java\jdk-1.8\legal\jdk\readme.txt	rundll32.exe
File created	C:\Program Files\Microsoft Office\root\Office16\FPA_FA000000006\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vreg\powerview.x-none.msi.16.x-none.vreg.dat	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.25\System.Diagnostics.TraceSource.dll	rundll32.exe
File opened for modification	C:\Program Files\7-Zip\Lang\nn.txt	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioPro2019VL_KMS_Client_AE-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\EXCEL.VisualElementsManifest.xml	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\browser\features\[email protected]	rundll32.exe
File opened for modification	C:\Program Files\Mozilla Firefox\browser\VisualElements\PrivateBrowsing_150.png	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.25\System.IO.FileSystem.AccessControl.dll	rundll32.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ink\ipsplk.xml	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Professional2019DemoR_BypassTrial180-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Professional2019R_Retail-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.25\System.Memory.dll	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 (x86)\Microsoft\EdgeUpdate_bk\1.3.185.17\msedgeupdateres_ru.dll	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\Office16\OSPPREARM.EXE	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Integration\C2RManifest.PowerPoint.PowerPoint.x-none.msi.16.x-none.xml	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\MSOHEV.DLL	rundll32.exe
File created	C:\Program Files\VideoLAN\VLC\locale\pl\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\api-ms-win-crt-runtime-l1-1-0.dll	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Personal2019R_Retail-ul-phn.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioStdO365R_Subscription-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\WordR_Grace-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\cpprestsdk.dll	rundll32.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\j2gss.dll	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioStd2019VL_MAK_AE-ul-phn.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\7-Zip\License.txt	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdR_Retail-ul-oob.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.0\Microsoft.VisualBasic.dll	rundll32.exe
File created	C:\Program Files\Common Files\System\uk-UA\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ClickToRun\ServiceWatcherSchedule.xml	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_OEM_Perp-pl.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\pkeyconfig-office.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\MondoR_Subscription-pl.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Standard2019VL_KMS_Client_AE-ul-oob.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vreg\officemuiset.msi.16.en-us.vreg.dat	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.0\System.IO.Compression.Native.dll	rundll32.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ink\ipstr.xml	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019R_OEM_Perp-pl.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlusR_Trial2-ppd.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\msadc\msdaprst.dll	rundll32.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\ko-KR\readme.txt	rundll32.exe
File created	C:\Program Files\Common Files\microsoft shared\MSInfo\ja-JP\readme.txt	rundll32.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\MondoVL_MAK-ul-phn.xrm-ms	rundll32.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.25\System.Diagnostics.Tools.dll	rundll32.exe

Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Processes:

vssadmin.exe

pid process

4804 vssadmin.exe

pid	process
4804	vssadmin.exe

Modifies registry class 3 IoCs

Processes:

rundll32.exe

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

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 2044 vssvc.exe
Token: SeRestorePrivilege 2044 vssvc.exe
Token: SeAuditPrivilege 2044 vssvc.exe

description	pid	process
Token: SeBackupPrivilege	2044	vssvc.exe
Token: SeRestorePrivilege	2044	vssvc.exe
Token: SeAuditPrivilege	2044	vssvc.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

rundll32.exerundll32.execmd.exe

description	pid	process	target process
PID 3576 wrote to memory of 1620	3576	rundll32.exe	rundll32.exe
PID 3576 wrote to memory of 1620	3576	rundll32.exe	rundll32.exe
PID 3576 wrote to memory of 1620	3576	rundll32.exe	rundll32.exe
PID 1620 wrote to memory of 1080	1620	rundll32.exe	cmd.exe
PID 1620 wrote to memory of 1080	1620	rundll32.exe	cmd.exe
PID 1620 wrote to memory of 1080	1620	rundll32.exe	cmd.exe
PID 1080 wrote to memory of 4804	1080	cmd.exe	vssadmin.exe
PID 1080 wrote to memory of 4804	1080	cmd.exe	vssadmin.exe
PID 1620 wrote to memory of 2852	1620	rundll32.exe	cmd.exe
PID 1620 wrote to memory of 2852	1620	rundll32.exe	cmd.exe
PID 1620 wrote to memory of 2852	1620	rundll32.exe	cmd.exe

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:3576
- 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:1620
- - 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:1080
  - - C:\Windows\system32\vssadmin.exe
      C:\Windows\SysNative\vssadmin.exe delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:4804
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c C:\Windows\System32\vssadmin.exe delete shadows /all /quiet
    3⤵
    PID:2852

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2044

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

Defacement

T1491

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

C:\ProgramData\readme.txt

Filesize
394B

MD5
b17425a4db71b2ef8b7decd01038e502

SHA1
7e761bce96cc3033dec3a1c61d2672c6fbae3718

SHA256
36c359b9db03e7a6df3c37a25b16c53a71d6a866e6332faf203f19ddbfc1ed68

SHA512
fbe107f9275231e2e2dbbd80475d51e641a38fd24241366c3af0ed14d0f383bd9de731f2ed8b355c40a68008a6d80dbfb4008e06fd2538483bb8388c7085f636

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