Malware Analysis Report

2024-10-19 08:16

Sample ID 240831-btl9maxfle
Target 5d9afa34d58d686ea27ab01f4f681d56.zip
SHA256 584cfa980d017c79576ec0bdf57dcb346b64d0e10dc878d5c6e6002f1582f21a
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

584cfa980d017c79576ec0bdf57dcb346b64d0e10dc878d5c6e6002f1582f21a

Threat Level: Known bad

The file 5d9afa34d58d686ea27ab01f4f681d56.zip was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery

Expiro, m0yv

Expiro payload

System Location Discovery: System Language Discovery

Unsigned PE

Program crash

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-31 01:26

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-31 01:26

Reported

2024-08-31 01:28

Platform

win10v2004-20240802-en

Max time kernel

136s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.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\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.exe

"C:\Users\Admin\AppData\Local\Temp\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3112 -ip 3112

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3112 -s 532

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 17.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 147.142.123.92.in-addr.arpa udp
US 52.111.229.48:443 tcp
US 8.8.8.8:53 21.236.111.52.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
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp

Files

memory/3112-0-0x0000000000B2B000-0x0000000000BBF000-memory.dmp

memory/3112-1-0x0000000000AB0000-0x0000000000BBF000-memory.dmp

memory/3112-2-0x0000000000B2B000-0x0000000000BBF000-memory.dmp

memory/3112-3-0x0000000000AB0000-0x0000000000BBF000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-31 01:26

Reported

2024-08-31 01:28

Platform

win7-20240708-en

Max time kernel

119s

Max time network

119s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.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\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.exe

"C:\Users\Admin\AppData\Local\Temp\b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1724 -s 144

Network

N/A

Files

memory/1724-0-0x000000000031B000-0x00000000003AF000-memory.dmp

memory/1724-1-0x00000000002A0000-0x00000000003AF000-memory.dmp

memory/1724-2-0x000000000031B000-0x00000000003AF000-memory.dmp