Malware Analysis Report

2025-04-13 23:46

Sample ID 250103-kn5nfswmcz
Target JaffaCakes118_6b7650b7e071137377c8b63540091cf2
SHA256 9222c89d1ab5cbe9b2205c28bf8d28c86adedfd4ee419aec2cd8219a0b210c48
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

9222c89d1ab5cbe9b2205c28bf8d28c86adedfd4ee419aec2cd8219a0b210c48

Threat Level: Known bad

The file JaffaCakes118_6b7650b7e071137377c8b63540091cf2 was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery

Expiro family

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

2025-01-03 08:45

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-03 08:45

Reported

2025-01-03 08:48

Platform

win7-20240903-en

Max time kernel

117s

Max time network

117s

Command Line

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe"

Signatures

Expiro family

expiro

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\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1344 -s 68

Network

N/A

Files

memory/1344-0-0x00000000001DC000-0x000000000026F000-memory.dmp

memory/1344-1-0x0000000000170000-0x000000000026F000-memory.dmp

memory/1344-2-0x00000000001DC000-0x000000000026F000-memory.dmp

memory/1344-3-0x0000000000170000-0x000000000026F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-03 08:45

Reported

2025-01-03 08:48

Platform

win10v2004-20241007-en

Max time kernel

92s

Max time network

136s

Command Line

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe"

Signatures

Expiro family

expiro

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\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 376 -p 3832 -ip 3832

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3832 -s 252

Network

Country Destination Domain Proto
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp

Files

memory/3832-0-0x0000000000D1C000-0x0000000000DAF000-memory.dmp

memory/3832-1-0x0000000000CB0000-0x0000000000DAF000-memory.dmp

memory/3832-2-0x0000000000D1C000-0x0000000000DAF000-memory.dmp

memory/3832-3-0x0000000000CB0000-0x0000000000DAF000-memory.dmp