expiro | b986b2965bd9c73f66200012455879b761d60b83602a3984fceb976633a54bfb

Analysis

max time kernel
104s
max time network
128s
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, 05:27

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General

Target

b986b2965bd9c73f66200012455879b761d60b83602a3984fceb976633a54bfb.exe
Size

599KB
MD5

fc83daaaf7c85ccd563281a3f95875fa
SHA1

c91bf1100c1d204dfecb40d9669c45b733735eea
SHA256

b986b2965bd9c73f66200012455879b761d60b83602a3984fceb976633a54bfb
SHA512

fae9befe9241ef15b4c7f0b0b4e6107970381d8220d8b43cec2ca4818d19112d2cf3834c5e3372b49a8a7ff649916afb32e390552f4eeec132e9ac237c7d7e01
SSDEEP

12288:O7gKNkhm/JuyXnPB+h8WH3nUQjHPuLH8j9EWWVzdqzohY6Si/j:O7zNkhm5PBXsuLcREVVzVhj

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/3232-0-0x0000000000C7A000-0x0000000000CAC000-memory.dmp	family_expiro1
behavioral1/memory/3232-1-0x0000000000BE0000-0x0000000000CAC000-memory.dmp	family_expiro1
behavioral1/memory/3232-2-0x0000000000C7A000-0x0000000000CAC000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2868	3232	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	b986b2965bd9c73f66200012455879b761d60b83602a3984fceb976633a54bfb.exe

C:\Users\Admin\AppData\Local\Temp\b986b2965bd9c73f66200012455879b761d60b83602a3984fceb976633a54bfb.exe
"C:\Users\Admin\AppData\Local\Temp\b986b2965bd9c73f66200012455879b761d60b83602a3984fceb976633a54bfb.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:3232
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3232 -s 348
  2⤵
  - Program crash
  PID:2868

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3232 -ip 3232
1⤵
PID:1168

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/3232-0-0x0000000000C7A000-0x0000000000CAC000-memory.dmp

Filesize
200KB

Download
memory/3232-1-0x0000000000BE0000-0x0000000000CAC000-memory.dmp

Filesize
816KB

Download
memory/3232-2-0x0000000000C7A000-0x0000000000CAC000-memory.dmp

Filesize
200KB

Download