Malware Analysis Report

2024-10-23 20:59

Sample ID 240831-pme4matarl
Target 37fc923f5c9d98bff902d465e93f84d0b1f1448648b5dd83c522b0a74c7bc608
SHA256 37fc923f5c9d98bff902d465e93f84d0b1f1448648b5dd83c522b0a74c7bc608
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

37fc923f5c9d98bff902d465e93f84d0b1f1448648b5dd83c522b0a74c7bc608

Threat Level: Known bad

The file 37fc923f5c9d98bff902d465e93f84d0b1f1448648b5dd83c522b0a74c7bc608 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

2024-08-31 12:26

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-31 12:26

Reported

2024-08-31 12:29

Platform

win7-20240708-en

Max time kernel

16s

Max time network

17s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.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

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\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.exe

"C:\Users\Admin\AppData\Local\Temp\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2380 -s 64

Network

N/A

Files

memory/2380-0-0x00000000007FB000-0x000000000088E000-memory.dmp

memory/2380-1-0x0000000000790000-0x000000000088E000-memory.dmp

memory/2380-2-0x00000000007FB000-0x000000000088E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-31 12:26

Reported

2024-08-31 12:29

Platform

win10v2004-20240802-en

Max time kernel

133s

Max time network

103s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.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\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.exe

"C:\Users\Admin\AppData\Local\Temp\e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2924 -ip 2924

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2924 -s 260

Network

Country Destination Domain Proto
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp

Files

memory/2924-0-0x000000000099B000-0x0000000000A2E000-memory.dmp

memory/2924-1-0x0000000000930000-0x0000000000A2E000-memory.dmp

memory/2924-2-0x000000000099B000-0x0000000000A2E000-memory.dmp

memory/2924-3-0x0000000000930000-0x0000000000A2E000-memory.dmp