Malware Analysis Report

2024-10-23 20:59

Sample ID 240901-yd3b8s1anh
Target a6b8db8215b183a84d56e2c0e76147fa.zip
SHA256 1e2e8a70198577d4c6e69b5f6204272091dcb370baa649cd63d44474c273ddbd
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

1e2e8a70198577d4c6e69b5f6204272091dcb370baa649cd63d44474c273ddbd

Threat Level: Known bad

The file a6b8db8215b183a84d56e2c0e76147fa.zip was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery

Expiro, m0yv

Expiro payload

Unsigned PE

Program crash

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-01 19:41

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-01 19:41

Reported

2024-09-01 19:43

Platform

win7-20240708-en

Max time kernel

121s

Max time network

127s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.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\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.exe

"C:\Users\Admin\AppData\Local\Temp\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2116 -s 156

Network

N/A

Files

memory/2116-0-0x000000000191E000-0x00000000019B1000-memory.dmp

memory/2116-1-0x00000000011D0000-0x00000000019B1000-memory.dmp

memory/2116-2-0x000000000191E000-0x00000000019B1000-memory.dmp

memory/2116-3-0x00000000011D0000-0x00000000019B1000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-01 19:41

Reported

2024-09-01 19:43

Platform

win10v2004-20240802-en

Max time kernel

94s

Max time network

100s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.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\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.exe

"C:\Users\Admin\AppData\Local\Temp\a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2368 -ip 2368

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2368 -s 428

Network

Country Destination Domain Proto
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 73.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp

Files

memory/2368-0-0x000000000099E000-0x0000000000A31000-memory.dmp

memory/2368-1-0x0000000000250000-0x0000000000A31000-memory.dmp

memory/2368-2-0x000000000099E000-0x0000000000A31000-memory.dmp

memory/2368-3-0x0000000000250000-0x0000000000A31000-memory.dmp