expiro | 2db3360907c43cb9256ec8e17ec6cdead20868c3982903e52012acebb8794a94

Analysis

max time kernel
118s
max time network
123s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
07-01-2025 05:33

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General

Target

JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe
Size

7.3MB
MD5

504aaeb7416ff016459b09b616d21c24
SHA1

665ad675fb1d41af1cb38709d6bbe965ee082486
SHA256

2db3360907c43cb9256ec8e17ec6cdead20868c3982903e52012acebb8794a94
SHA512

df2676e46ffd8909ab24c813a5e7253bf2e0fe686bf77488a66dc1b818f48cb7a255d9b2c58460ed7e8767349e39e7e6f8d59f677b7a995de0d53eacde8781c1
SSDEEP

98304:bxC3ud6MOIvysiwCQKzo5qphIHVruP3WpF3UdE1hZHEdLFymil+:QGQFMkhgJuP32+dmhZk/w

Score

10^/10

expiro backdoor discovery

Malware Config

Signatures

Expiro family
expiro
Expiro, m0yv
Expiro aka m0yv is a multi-functional backdoor written in C++.
backdoor expiro

Expiro payload 4 IoCs

backdoor

resource	yara_rule
behavioral1/memory/2760-0-0x000000000102E000-0x00000000010C1000-memory.dmp	family_expiro1
behavioral1/memory/2760-1-0x00000000008E0000-0x00000000010C1000-memory.dmp	family_expiro1
behavioral1/memory/2760-2-0x000000000102E000-0x00000000010C1000-memory.dmp	family_expiro1
behavioral1/memory/2760-3-0x00000000008E0000-0x00000000010C1000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2860	2760	WerFault.exe	29

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 2860	2760	JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe	30
PID 2760 wrote to memory of 2860	2760	JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe	30
PID 2760 wrote to memory of 2860	2760	JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe	30
PID 2760 wrote to memory of 2860	2760	JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_504aaeb7416ff016459b09b616d21c24.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2760
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2760 -s 156
  2⤵
  - Program crash
  PID:2860

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2760-0-0x000000000102E000-0x00000000010C1000-memory.dmp

Filesize
588KB

Download
memory/2760-1-0x00000000008E0000-0x00000000010C1000-memory.dmp

Filesize
7.9MB

Download
memory/2760-2-0x000000000102E000-0x00000000010C1000-memory.dmp

Filesize
588KB

Download
memory/2760-3-0x00000000008E0000-0x00000000010C1000-memory.dmp

Filesize
7.9MB

Download