Malware Analysis Report

2024-10-23 20:59

Sample ID 240901-x4cc3azcnm
Target 8b6c68e136bc1e084adc817668558bf2.zip
SHA256 acab845ba6a90301163c1c73c2dd81dd68491a7ab047fa8fddf76257bcbb8c77
Tags
expiro backdoor discovery
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

acab845ba6a90301163c1c73c2dd81dd68491a7ab047fa8fddf76257bcbb8c77

Threat Level: Known bad

The file 8b6c68e136bc1e084adc817668558bf2.zip was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery

Expiro, m0yv

Expiro payload

Program crash

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-01 19:24

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-01 19:24

Reported

2024-09-01 19:26

Platform

win7-20240705-en

Max time kernel

118s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe"

Signatures

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
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

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe

"C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2676 -s 64

Network

N/A

Files

memory/2676-0-0x000000000063B000-0x00000000006CE000-memory.dmp

memory/2676-1-0x00000000005D0000-0x00000000006CE000-memory.dmp

memory/2676-2-0x000000000063B000-0x00000000006CE000-memory.dmp

memory/2676-3-0x00000000005D0000-0x00000000006CE000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-01 19:24

Reported

2024-09-01 19:26

Platform

win10v2004-20240802-en

Max time kernel

94s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe"

Signatures

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
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

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe

"C:\Users\Admin\AppData\Local\Temp\ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2968 -ip 2968

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2968 -s 256

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 73.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

memory/2968-0-0x00000000003AB000-0x000000000043E000-memory.dmp

memory/2968-1-0x0000000000340000-0x000000000043E000-memory.dmp

memory/2968-2-0x00000000003AB000-0x000000000043E000-memory.dmp

memory/2968-3-0x0000000000340000-0x000000000043E000-memory.dmp