Malware Analysis Report

2025-03-14 22:36

Sample ID 240406-z9zfwsbd2t
Target Birele.exe
SHA256 b2dcfdf9e7b09f2aa5004668370e77982963ace820e7285b2e264a294441da23
Tags
upx persistence
score
10/10

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
10/10

SHA256

b2dcfdf9e7b09f2aa5004668370e77982963ace820e7285b2e264a294441da23

Threat Level: Known bad

The file Birele.exe was found to be: Known bad.

Malicious Activity Summary

upx persistence

Modifies WinLogon for persistence

UPX packed file

Adds Run key to start application

Unsigned PE

Kills process with taskkill

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-06 21:25

Signatures

UPX packed file

upx
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
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-06 21:25

Reported

2024-04-06 22:04

Platform

win10-20240404-en

Max time kernel

1192s

Max time network

872s

Command Line

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

Signatures

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Birele.exe" C:\Users\Admin\AppData\Local\Temp\Birele.exe N/A

UPX packed file

upx
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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\system = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Birele.exe" C:\Users\Admin\AppData\Local\Temp\Birele.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2544 wrote to memory of 1624 N/A C:\Users\Admin\AppData\Local\Temp\Birele.exe C:\Windows\SysWOW64\taskkill.exe
PID 2544 wrote to memory of 1624 N/A C:\Users\Admin\AppData\Local\Temp\Birele.exe C:\Windows\SysWOW64\taskkill.exe
PID 2544 wrote to memory of 1624 N/A C:\Users\Admin\AppData\Local\Temp\Birele.exe C:\Windows\SysWOW64\taskkill.exe

Processes

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

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

C:\Windows\SysWOW64\taskkill.exe

taskkill /F /IM explorer.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 0.0.0.0.0.0.0.6.0.0.0.0.0.0.0.1.0.0.0.0.0.0.0.0.8.0.8.0.8.0.8.0.ip6.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 78.239.69.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp

Files

memory/2544-0-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2544-1-0x0000000002020000-0x0000000002026000-memory.dmp

memory/2544-2-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2544-4-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2544-5-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2544-6-0x0000000000400000-0x0000000000438000-memory.dmp