Malware Analysis Report

2025-04-13 23:46

Sample ID 250103-w3h9jszlhn
Target JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978
SHA256 eda3f18c9145125002fd98051cd2da7e4ccb21db905560c55c98758100fd3145
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

eda3f18c9145125002fd98051cd2da7e4ccb21db905560c55c98758100fd3145

Threat Level: Known bad

The file JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978 was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery

Expiro family

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

2025-01-03 18:26

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-03 18:26

Reported

2025-01-03 18:29

Platform

win7-20240708-en

Max time kernel

122s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978.exe"

Signatures

Expiro family

expiro

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
Description Indicator Process Target
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_6e9c6bc31a8a22309ed4e8a98a943978.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978.exe

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2644 -s 268

Network

N/A

Files

memory/2644-0-0x0000000001000000-0x00000000011C6000-memory.dmp

memory/2644-1-0x0000000000AF0000-0x0000000000CB6000-memory.dmp

memory/2644-2-0x0000000001000000-0x00000000011C6000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-03 18:26

Reported

2025-01-03 18:29

Platform

win10v2004-20241007-en

Max time kernel

94s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978.exe"

Signatures

Expiro family

expiro

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
Description Indicator Process Target
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_6e9c6bc31a8a22309ed4e8a98a943978.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978.exe

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6e9c6bc31a8a22309ed4e8a98a943978.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4380 -ip 4380

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4380 -s 572

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 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

memory/4380-0-0x0000000001000000-0x00000000011C6000-memory.dmp

memory/4380-1-0x0000000001000000-0x00000000011C6000-memory.dmp