Malware Analysis Report

2024-10-10 07:51

Sample ID 240615-t62tys1ekj
Target BakosFree2.exe
SHA256 8970a16295267765ab6b690e7f0d4d1e9bd5cc0b7a51d2d048bf069fcc8adc02
Tags
evasion themida trojan
score
9/10

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 Overview

score
9/10

SHA256

8970a16295267765ab6b690e7f0d4d1e9bd5cc0b7a51d2d048bf069fcc8adc02

Threat Level: Likely malicious

The file BakosFree2.exe was found to be: Likely malicious.

Malicious Activity Summary

evasion themida trojan

Identifies VirtualBox via ACPI registry values (likely anti-VM)

Checks BIOS information in registry

Themida packer

Checks whether UAC is enabled

Suspicious use of NtSetInformationThreadHideFromDebugger

Unsigned PE

Delays execution with timeout.exe

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-15 16:41

Signatures

Themida packer

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

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-15 16:40

Reported

2024-06-15 16:43

Platform

win10v2004-20240508-en

Max time kernel

43s

Max time network

45s

Command Line

"C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe"

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM)

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe N/A

Themida packer

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

Checks whether UAC is enabled

evasion trojan
Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\timeout.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3668 wrote to memory of 1620 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 3668 wrote to memory of 1620 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 3668 wrote to memory of 3568 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 3668 wrote to memory of 3568 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 3668 wrote to memory of 216 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 3668 wrote to memory of 216 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 216 wrote to memory of 1544 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\certutil.exe
PID 216 wrote to memory of 1544 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\certutil.exe
PID 216 wrote to memory of 1820 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\find.exe
PID 216 wrote to memory of 1820 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\find.exe
PID 216 wrote to memory of 4980 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\find.exe
PID 216 wrote to memory of 4980 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\find.exe
PID 3668 wrote to memory of 4968 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 3668 wrote to memory of 4968 N/A C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe C:\Windows\system32\cmd.exe
PID 4968 wrote to memory of 4924 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe
PID 4968 wrote to memory of 4924 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe
PID 4924 wrote to memory of 2148 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 4924 wrote to memory of 2148 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe

Processes

C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe

"C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe"

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c color 6

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c cls

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe" MD5 | find /i /v "md5" | find /i /v "certutil"

C:\Windows\system32\certutil.exe

certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\BakosFree2.exe" MD5

C:\Windows\system32\find.exe

find /i /v "md5"

C:\Windows\system32\find.exe

find /i /v "certutil"

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c start cmd /C "color b && title Error && echo Couldn't resolve host name && timeout /t 5"

C:\Windows\system32\cmd.exe

cmd /C "color b && title Error && echo Couldn't resolve host name && timeout /t 5"

C:\Windows\system32\timeout.exe

timeout /t 5

Network

Country Destination Domain Proto
US 8.8.8.8:53 keyauth.win udp
N/A 127.0.0.1:57622 tcp
N/A 127.0.0.1:57624 tcp

Files

memory/3668-0-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-1-0x00007FF921990000-0x00007FF921992000-memory.dmp

memory/3668-3-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-4-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-2-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-5-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-6-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-7-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp

memory/3668-9-0x00007FF6B1B20000-0x00007FF6B2573000-memory.dmp