Malware Analysis Report

2024-10-16 03:24

Sample ID 211012-z3xcysdcc6
Target crypto.exe.unsafe
SHA256 c94a81fdf688d220827320e88cc0b89af8690142abe5c602131b6659297c7d24
Tags
babuk ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

c94a81fdf688d220827320e88cc0b89af8690142abe5c602131b6659297c7d24

Threat Level: Known bad

The file crypto.exe.unsafe was found to be: Known bad.

Malicious Activity Summary

babuk ransomware

Babuk Locker

Deletes shadow copies

Modifies extensions of user files

Enumerates connected drives

Enumerates physical storage devices

Interacts with shadow copies

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-10-12 21:15

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2021-10-12 21:15

Reported

2021-10-12 21:17

Platform

win7-en-20210920

Max time kernel

118s

Max time network

117s

Command Line

"C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe"

Signatures

Babuk Locker

ransomware babuk

Deletes shadow copies

ransomware

Modifies extensions of user files

ransomware
Description Indicator Process Target
File opened for modification C:\Users\Admin\Pictures\ConnectSplit.raw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\MergeRename.tiff => C:\Users\Admin\Pictures\MergeRename.tiff.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\MergeRename.tiff.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\SubmitTrace.tif => C:\Users\Admin\Pictures\SubmitTrace.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\SubmitTrace.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\MergeRename.tiff C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\ConnectSplit.raw => C:\Users\Admin\Pictures\ConnectSplit.raw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\M: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\R: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\S: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\L: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\V: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\H: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\J: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\K: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\X: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\W: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\E: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\T: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\I: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\P: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\A: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\G: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\B: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\N: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\Q: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\Y: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\U: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\O: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A

Enumerates physical storage devices

Interacts with shadow copies

ransomware
Description Indicator Process Target
N/A N/A C:\Windows\system32\vssadmin.exe N/A
N/A N/A C:\Windows\system32\vssadmin.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeBackupPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeAuditPrivilege N/A C:\Windows\system32\vssvc.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1424 wrote to memory of 836 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1424 wrote to memory of 836 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1424 wrote to memory of 836 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1424 wrote to memory of 836 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 836 wrote to memory of 1360 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 836 wrote to memory of 1360 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 836 wrote to memory of 1360 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 1424 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1424 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1424 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1424 wrote to memory of 1460 N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe C:\Windows\System32\cmd.exe
PID 1460 wrote to memory of 872 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 1460 wrote to memory of 872 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 1460 wrote to memory of 872 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\vssadmin.exe

Processes

C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe

"C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet

C:\Windows\system32\vssadmin.exe

vssadmin.exe delete shadows /all /quiet

C:\Windows\system32\vssvc.exe

C:\Windows\system32\vssvc.exe

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet

C:\Windows\system32\vssadmin.exe

vssadmin.exe delete shadows /all /quiet

Network

N/A

Files

memory/1424-54-0x000000000058B000-0x000000000059C000-memory.dmp

memory/1424-55-0x0000000076201000-0x0000000076203000-memory.dmp

memory/1424-56-0x0000000000220000-0x0000000000235000-memory.dmp

memory/1424-57-0x0000000000400000-0x0000000000455000-memory.dmp

memory/836-58-0x0000000000000000-mapping.dmp

memory/1360-59-0x0000000000000000-mapping.dmp

memory/1460-60-0x0000000000000000-mapping.dmp

memory/872-61-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2021-10-12 21:15

Reported

2021-10-12 21:17

Platform

win10v20210408

Max time kernel

41s

Max time network

116s

Command Line

"C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe"

Signatures

Babuk Locker

ransomware babuk

Deletes shadow copies

ransomware

Modifies extensions of user files

ransomware
Description Indicator Process Target
File renamed C:\Users\Admin\Pictures\CopyRemove.tif => C:\Users\Admin\Pictures\CopyRemove.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\LockHide.crw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\SendRename.tiff C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\SplitRead.raw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\ApproveWait.crw => C:\Users\Admin\Pictures\ApproveWait.crw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\CopyRemove.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\ImportSubmit.crw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\InitializeConvert.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\InstallSearch.png.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\SyncExport.tiff C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\SyncExport.tiff => C:\Users\Admin\Pictures\SyncExport.tiff.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\UpdateRegister.png.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\DisableMove.tif => C:\Users\Admin\Pictures\DisableMove.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\ImportSubmit.crw => C:\Users\Admin\Pictures\ImportSubmit.crw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\InitializeConvert.tif => C:\Users\Admin\Pictures\InitializeConvert.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\InstallSearch.png => C:\Users\Admin\Pictures\InstallSearch.png.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\SendRename.tiff => C:\Users\Admin\Pictures\SendRename.tiff.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\UpdateRegister.png => C:\Users\Admin\Pictures\UpdateRegister.png.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\ApproveWait.crw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\LockHide.crw => C:\Users\Admin\Pictures\LockHide.crw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\SendRename.tiff.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File renamed C:\Users\Admin\Pictures\SplitRead.raw => C:\Users\Admin\Pictures\SplitRead.raw.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\SyncExport.tiff.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened for modification C:\Users\Admin\Pictures\DisableMove.tif.babyk C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\K: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\L: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\W: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\T: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\O: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\P: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\A: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\J: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\X: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\N: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\M: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\E: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\R: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\V: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\B: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\H: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\Q: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\Y: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\U: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\I: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\S: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
File opened (read-only) \??\G: C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A

Enumerates physical storage devices

Interacts with shadow copies

ransomware
Description Indicator Process Target
N/A N/A C:\Windows\system32\vssadmin.exe N/A
N/A N/A C:\Windows\system32\vssadmin.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeBackupPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeAuditPrivilege N/A C:\Windows\system32\vssvc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe

"C:\Users\Admin\AppData\Local\Temp\crypto.exe.unsafe.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet

C:\Windows\system32\vssadmin.exe

vssadmin.exe delete shadows /all /quiet

C:\Windows\system32\vssvc.exe

C:\Windows\system32\vssvc.exe

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet

C:\Windows\system32\vssadmin.exe

vssadmin.exe delete shadows /all /quiet

Network

Country Destination Domain Proto
US 8.8.8.8:53 time.windows.com udp
NL 20.101.57.9:123 time.windows.com udp

Files

memory/568-115-0x00000000001D0000-0x00000000001E5000-memory.dmp

memory/568-116-0x0000000000400000-0x0000000000455000-memory.dmp

memory/376-117-0x0000000000000000-mapping.dmp

memory/1908-118-0x0000000000000000-mapping.dmp

memory/2700-119-0x0000000000000000-mapping.dmp

memory/3828-120-0x0000000000000000-mapping.dmp