Malware Analysis Report

2024-09-11 05:43

Sample ID 240608-p8hrmscg32
Target Clutt3.5.exe
SHA256 57e542f11f189ba338c74406fb48ca0091279e66d2e0491e9e7c9a6c61d66b6d
Tags
bootkit discovery evasion exploit persistence
score
8/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
8/10

SHA256

57e542f11f189ba338c74406fb48ca0091279e66d2e0491e9e7c9a6c61d66b6d

Threat Level: Likely malicious

The file Clutt3.5.exe was found to be: Likely malicious.

Malicious Activity Summary

bootkit discovery evasion exploit persistence

Disables RegEdit via registry modification

Possible privilege escalation attempt

Disables Task Manager via registry modification

Modifies file permissions

Writes to the Master Boot Record (MBR)

Enumerates physical storage devices

Unsigned PE

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Pre-OS Boot
T1542
Bootkit
T1542.003
Privilege Escalation
TA0004
Defense Evasion
TA0005
File and Directory Permissions Modification
T1222
Pre-OS Boot
T1542
Bootkit
T1542.003
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-08 12:59

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-08 12:59

Reported

2024-06-08 13:00

Platform

win11-20240419-en

Max time kernel

15s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe"

Signatures

Disables RegEdit via registry modification

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\USER\S-1-5-21-1474490143-3221292397-4168103503-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A

Disables Task Manager via registry modification

evasion

Possible privilege escalation attempt

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

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\system32\takeown.exe N/A
Token: 33 N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\system32\AUDIODG.EXE N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4144 wrote to memory of 2076 N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe C:\Windows\System32\cmd.exe
PID 4144 wrote to memory of 2076 N/A C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe C:\Windows\System32\cmd.exe
PID 2076 wrote to memory of 4772 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 2076 wrote to memory of 4772 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 2076 wrote to memory of 3884 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 2076 wrote to memory of 3884 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe

Processes

C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe

"C:\Users\Admin\AppData\Local\Temp\Clutt3.5.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\drivers && icacls C:\Windows\System32\drivers /grant "%username%:F" && exit

C:\Windows\system32\takeown.exe

takeown /f C:\Windows\System32\drivers

C:\Windows\system32\icacls.exe

icacls C:\Windows\System32\drivers /grant "Admin:F"

C:\Windows\system32\AUDIODG.EXE

C:\Windows\system32\AUDIODG.EXE 0x00000000000004D8 0x00000000000004D4

Network

N/A

Files

memory/4144-0-0x00007FFE6B1F3000-0x00007FFE6B1F5000-memory.dmp

memory/4144-1-0x0000000000660000-0x00000000006A6000-memory.dmp

memory/4144-2-0x0000000000EE0000-0x0000000000F26000-memory.dmp

memory/4144-3-0x0000000000F30000-0x0000000000F36000-memory.dmp

memory/4144-4-0x00007FFE6B1F0000-0x00007FFE6BCB2000-memory.dmp