expiro | 03cde0dbb76a1570ee25dedae88247cb25b4b8711b8f7689374d25783e3c5e61

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-01-2025 13:08

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General

Target

JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe
Size

411KB
MD5

c8e64b435a148d0c8b7fc33df931419e
SHA1

f7c2fc8bd4af764d1acb9f799aa7d0523ea43a65
SHA256

03cde0dbb76a1570ee25dedae88247cb25b4b8711b8f7689374d25783e3c5e61
SHA512

0d0d496a412ac5f66085373621025f79823717205d631626d475b4c5eeae6ff440159cc39edf04fbd82ddbfec95da1d74dbaf3a29b4c0f5af35787194d37e21a
SSDEEP

12288:xetLagza/unbxptpNWXkVTTM5ct0bDMT:xettMMbxpzNMk12c20T

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/2544-0-0x000000000119B000-0x000000000122E000-memory.dmp	family_expiro1
behavioral1/memory/2544-1-0x0000000001130000-0x000000000122E000-memory.dmp	family_expiro1
behavioral1/memory/2544-2-0x000000000119B000-0x000000000122E000-memory.dmp	family_expiro1
behavioral1/memory/2544-3-0x0000000001130000-0x000000000122E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2512	2544	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_c8e64b435a148d0c8b7fc33df931419e.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2544 wrote to memory of 2512	2544	JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe	30
PID 2544 wrote to memory of 2512	2544	JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe	30
PID 2544 wrote to memory of 2512	2544	JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe	30
PID 2544 wrote to memory of 2512	2544	JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_c8e64b435a148d0c8b7fc33df931419e.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2544
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2544 -s 96
  2⤵
  - Program crash
  PID:2512

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/2544-0-0x000000000119B000-0x000000000122E000-memory.dmp

Filesize
588KB

Download
memory/2544-1-0x0000000001130000-0x000000000122E000-memory.dmp

Filesize
1016KB

Download
memory/2544-2-0x000000000119B000-0x000000000122E000-memory.dmp

Filesize
588KB

Download
memory/2544-3-0x0000000001130000-0x000000000122E000-memory.dmp

Filesize
1016KB

Download