Malware Analysis Report

2024-10-19 08:15

Sample ID 240831-e7t36swdmj
Target a4e5f1e7b92724a85597335c940a8619.zip
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 a4e5f1e7b92724a85597335c940a8619.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

2024-08-31 04:35

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-31 04:35

Reported

2024-08-31 04:37

Platform

win7-20240708-en

Max time kernel

118s

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 784 -s 64

Network

N/A

Files

memory/784-0-0x000000000020B000-0x000000000029E000-memory.dmp

memory/784-1-0x00000000001A0000-0x000000000029E000-memory.dmp

memory/784-2-0x000000000020B000-0x000000000029E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-31 04:35

Reported

2024-08-31 04:37

Platform

win10v2004-20240802-en

Max time kernel

134s

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 2952 -ip 2952

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2952 -s 256

Network

Country Destination Domain Proto
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.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 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.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
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp

Files

memory/2952-0-0x000000000028B000-0x000000000031E000-memory.dmp

memory/2952-1-0x0000000000220000-0x000000000031E000-memory.dmp

memory/2952-2-0x000000000028B000-0x000000000031E000-memory.dmp

memory/2952-3-0x0000000000220000-0x000000000031E000-memory.dmp