expiro | 46a8f12f0a02b2698fc562e1a75079a1ac3b9d7dd36316d243fb52bb749797c9

Analysis

max time kernel
104s
max time network
113s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
12/04/2025, 03:19

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General

Target

46a8f12f0a02b2698fc562e1a75079a1ac3b9d7dd36316d243fb52bb749797c9.exe
Size

599KB
MD5

f5b1988ad78e27a1b6afa669e16a28e2
SHA1

4fa0c2bb293c5206cd12929fa6f85eda3b0e075f
SHA256

46a8f12f0a02b2698fc562e1a75079a1ac3b9d7dd36316d243fb52bb749797c9
SHA512

19cc41ec82c7a8d3d628d4cf7dd3ae5e9834de1a27e73a939efc6ff2238bd55e0aaa888e53dd9e3f6dbc1f3c2f006b664422ed9f69d84f3e4b4c302dae787aea
SSDEEP

12288:m7gKNkhm/JuyXnPB+h8WHyEpM22TAj8DcU+6qv+nxvuZa4EKbV4jRdXA75PhJpz:m7zNkhm5PBXVX2iAj8ldnWa4748r

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 3 IoCs

backdoor

resource	yara_rule
behavioral1/memory/5600-0-0x000000000036B000-0x00000000003FE000-memory.dmp	family_expiro1
behavioral1/memory/5600-1-0x00000000002D0000-0x00000000003FE000-memory.dmp	family_expiro1
behavioral1/memory/5600-2-0x000000000036B000-0x00000000003FE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3244	5600	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	46a8f12f0a02b2698fc562e1a75079a1ac3b9d7dd36316d243fb52bb749797c9.exe

C:\Users\Admin\AppData\Local\Temp\46a8f12f0a02b2698fc562e1a75079a1ac3b9d7dd36316d243fb52bb749797c9.exe
"C:\Users\Admin\AppData\Local\Temp\46a8f12f0a02b2698fc562e1a75079a1ac3b9d7dd36316d243fb52bb749797c9.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:5600
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5600 -s 348
  2⤵
  - Program crash
  PID:3244

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 5600 -ip 5600
1⤵
PID:3772

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

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Downloads

memory/5600-0-0x000000000036B000-0x00000000003FE000-memory.dmp

Filesize
588KB

Download
memory/5600-1-0x00000000002D0000-0x00000000003FE000-memory.dmp

Filesize
1.2MB

Download
memory/5600-2-0x000000000036B000-0x00000000003FE000-memory.dmp

Filesize
588KB

Download