blackmatter | b4b9fdf30c017af1a8a3375218e43073117690a71c3f00ac5f6361993471e5e7

Analysis

max time kernel
109s
max time network
126s
platform
windows10_x64
resource
win10-en-20211014
submitted
22-10-2021 06:42

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General

Target

01.exe
Size

78KB
MD5

5e2a1323dbf28eac8b3f4df9cb4f2d45
SHA1

af77a09387df4ec967a8314ba0f93da0ef8e57ee
SHA256

b4b9fdf30c017af1a8a3375218e43073117690a71c3f00ac5f6361993471e5e7
SHA512

c2ba4f7458298129a8d2f1ac50640601d59086048ecc8d3d88985c31edf4014e4f4838308192ab39fb21d71a9b362a38a93edff58b570ec6f5ccfb940d871b94

Score

10^/10

blackmatter ransomware

Malware Config

Extracted

Path

C:\WRLMMTHME.README.txt

Family

blackmatter

Ransom Note

~+ * + ' BLACK | () .-.,='``'=. - o - '=/_ \ | * | '=._ | \ `=./`, ' . '=.__.=' `=' * + Matter + O * ' . >>> What happens? Your network is encrypted, and currently not operational. We need only money, after payment we will give you a decryptor for the entire network and you will restore all the data. >>> What guarantees? We are not a politically motivated group and we do not need anything other than your money. If you pay, we will provide you the programs for decryption and we will delete your data. If we do not give you decrypters or we do not delete your data, no one will pay us in the future, this does not comply with our goals. We always keep our promises. >>> How to contact with us? 1. Download and install TOR Browser (https://www.torproject.org/). 2. Open http://supp24yy6a66hwszu2piygicgwzdtbwftb76htfj7vnip3getgqnzxid.onion/O3KTUJZRE6CB4Q1OBR >>> Warning! Recovery recommendations. We strongly recommend you to do not MODIFY or REPAIR your files, that will damage them.

URLs

http://supp24yy6a66hwszu2piygicgwzdtbwftb76htfj7vnip3getgqnzxid.onion/O3KTUJZRE6CB4Q1OBR

Signatures

BlackMatter Ransomware
BlackMatter ransomware group claims to be Darkside and REvil succesor.
ransomware blackmatter

Modifies extensions of user files 32 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Users\Admin\Pictures\LimitImport.tif => C:\Users\Admin\Pictures\LimitImport.tif.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\RegisterLock.tiff => C:\Users\Admin\Pictures\RegisterLock.tiff.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\SplitStop.png.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\StepRequest.tiff => C:\Users\Admin\Pictures\StepRequest.tiff.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\ApproveEnter.png.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\SelectReset.tiff	01.exe
File opened for modification	C:\Users\Admin\Pictures\SelectReset.tiff.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\SplitWrite.raw => C:\Users\Admin\Pictures\SplitWrite.raw.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\SplitWrite.raw.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\RegisterLock.tiff.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\ClearEnable.tiff.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\InstallTest.raw.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\ResolveTrace.crw.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\StepRequest.tiff.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\SubmitInstall.crw.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\ApproveEnter.png => C:\Users\Admin\Pictures\ApproveEnter.png.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\RegisterLock.tiff	01.exe
File renamed	C:\Users\Admin\Pictures\GroupBackup.raw => C:\Users\Admin\Pictures\GroupBackup.raw.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\InstallTest.raw => C:\Users\Admin\Pictures\InstallTest.raw.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\LimitImport.tif.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\ResolveTrace.crw => C:\Users\Admin\Pictures\ResolveTrace.crw.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\SelectReset.tiff => C:\Users\Admin\Pictures\SelectReset.tiff.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\SplitStop.png => C:\Users\Admin\Pictures\SplitStop.png.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\StepRequest.tiff	01.exe
File opened for modification	C:\Users\Admin\Pictures\GroupBackup.raw.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\SubmitInstall.crw => C:\Users\Admin\Pictures\SubmitInstall.crw.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\WriteExit.raw => C:\Users\Admin\Pictures\WriteExit.raw.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\CloseUnpublish.tif => C:\Users\Admin\Pictures\CloseUnpublish.tif.WRLMMTHME	01.exe
File renamed	C:\Users\Admin\Pictures\ClearEnable.tiff => C:\Users\Admin\Pictures\ClearEnable.tiff.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\CloseUnpublish.tif.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\WriteExit.raw.WRLMMTHME	01.exe
File opened for modification	C:\Users\Admin\Pictures\ClearEnable.tiff	01.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\Z:	01.exe

Sets desktop wallpaper using registry 2 TTPs 2 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000\Control Panel\Desktop\WallPaper = "C:\\ProgramData\\WRLMMTHME.bmp"	01.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000\Control Panel\Desktop\Wallpaper = "C:\\ProgramData\\WRLMMTHME.bmp"	01.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs

pid	Process
3380	01.exe
3380	01.exe
3380	01.exe
3380	01.exe
3380	01.exe
3380	01.exe

Modifies Control Panel 3 IoCs

evasion

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000\Control Panel\Desktop\WallpaperStyle = "10"	01.exe
Key created	\REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000\Control Panel\International	01.exe
Key created	\REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000\Control Panel\Desktop	01.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1776	NOTEPAD.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3380	01.exe
3380	01.exe
3380	01.exe
3380	01.exe

Suspicious use of AdjustPrivilegeToken 17 IoCs

description	pid	Process
Token: SeBackupPrivilege	3380	01.exe
Token: SeDebugPrivilege	3380	01.exe
Token: 36	3380	01.exe
Token: SeImpersonatePrivilege	3380	01.exe
Token: SeIncBasePriorityPrivilege	3380	01.exe
Token: SeIncreaseQuotaPrivilege	3380	01.exe
Token: 33	3380	01.exe
Token: SeManageVolumePrivilege	3380	01.exe
Token: SeProfSingleProcessPrivilege	3380	01.exe
Token: SeRestorePrivilege	3380	01.exe
Token: SeSecurityPrivilege	3380	01.exe
Token: SeSystemProfilePrivilege	3380	01.exe
Token: SeTakeOwnershipPrivilege	3380	01.exe
Token: SeShutdownPrivilege	3380	01.exe
Token: SeBackupPrivilege	1936	vssvc.exe
Token: SeRestorePrivilege	1936	vssvc.exe
Token: SeAuditPrivilege	1936	vssvc.exe

C:\Users\Admin\AppData\Local\Temp\01.exe
"C:\Users\Admin\AppData\Local\Temp\01.exe"
1⤵
- Modifies extensions of user files
- Enumerates connected drives
- Sets desktop wallpaper using registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Modifies Control Panel
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3380

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1936

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\WRLMMTHME.README.txt
1⤵
- Opens file in notepad (likely ransom note)
PID:1776

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1984

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

Replay Monitor

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Downloads

memory/3380-115-0x0000000002553000-0x0000000002555000-memory.dmp

Filesize
8KB

Download
memory/3380-116-0x0000000002550000-0x0000000002551000-memory.dmp

Filesize
4KB

Download