Malware Analysis Report

2024-10-19 08:16

Sample ID 240831-j422tstfpd
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

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

Program crash

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-31 08:14

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-31 08:14

Reported

2024-08-31 08:16

Platform

win10v2004-20240802-en

Max time kernel

138s

Max time network

127s

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 204 -p 4256 -ip 4256

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4256 -s 260

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.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 65.139.73.23.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp

Files

memory/4256-0-0x0000000000CBB000-0x0000000000D4E000-memory.dmp

memory/4256-1-0x0000000000C50000-0x0000000000D4E000-memory.dmp

memory/4256-2-0x0000000000CBB000-0x0000000000D4E000-memory.dmp

memory/4256-3-0x0000000000C50000-0x0000000000D4E000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-31 08:14

Reported

2024-08-31 08:16

Platform

win7-20240704-en

Max time kernel

119s

Max time network

120s

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 1828 -s 64

Network

N/A

Files

memory/1828-0-0x00000000007CB000-0x000000000085E000-memory.dmp

memory/1828-1-0x0000000000760000-0x000000000085E000-memory.dmp

memory/1828-2-0x00000000007CB000-0x000000000085E000-memory.dmp