expiro | 3b4f58f713fac136b2f4e7ab3c1684963fca697adf78ebab68b47ca660054ca1

Analysis

max time kernel
103s
max time network
105s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
11/04/2025, 17:24

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General

Target

JaffaCakes118_af49da143d00f8f932389a37deeb03f2.exe
Size

324KB
MD5

af49da143d00f8f932389a37deeb03f2
SHA1

ba9eac27b56ed359d5dda46b88949d3b9ce91858
SHA256

3b4f58f713fac136b2f4e7ab3c1684963fca697adf78ebab68b47ca660054ca1
SHA512

3f7e239cdf9dfee4381bd12108bad2b8b4da7447408436bcfcbd1778761200715039a7dcf19a4ad5e28ae48c92150c45f56415d65eb2f0dfcbe36da5e41d7d44
SSDEEP

6144:FUk69bJcXGOignKgHNDscKyZ4fIFDBU5lATn8F5QYDsa1:FUkENCDXn8J

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 1 IoCs

backdoor

resource	yara_rule
behavioral1/memory/2640-1-0x0000000000400000-0x000000000049F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1440	2640	WerFault.exe	84

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_af49da143d00f8f932389a37deeb03f2.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_af49da143d00f8f932389a37deeb03f2.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_af49da143d00f8f932389a37deeb03f2.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:2640
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2640 -s 544
  2⤵
  - Program crash
  PID:1440

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2640 -ip 2640
1⤵
PID:3136

Network

MITRE ATT&CK Enterprise v16

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

Replay Monitor

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Downloads

memory/2640-0-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download
memory/2640-1-0x0000000000400000-0x000000000049F000-memory.dmp

Filesize
636KB

Download