expiro | 91e218a730f3d5b8c88fdf5afb6a54b910fcc4f4c3fa0790d533accded7476b4

Analysis

max time kernel
120s
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, 17:20

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General

Target

91e218a730f3d5b8c88fdf5afb6a54b910fcc4f4c3fa0790d533accded7476b4.exe
Size

599KB
MD5

d782668484e4af52171d5dd77bade042
SHA1

700e08c97254d3912a3c9e6d89578748ad2e6371
SHA256

91e218a730f3d5b8c88fdf5afb6a54b910fcc4f4c3fa0790d533accded7476b4
SHA512

5f8e3e4b4d73eb3cd26cc67de6e3c8735969c5f33b2cae95586b388075d8eaab46a596380a383b5bbff2ef55cfb4aa9ebc13ae0d8085fd00b717d252ef5ea0e9
SSDEEP

12288:F7gKNkhm/JuyXnPB+h8WHe8/jBGs5HdUV:F7zNkhm5PBX/8/jdd

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/5568-0-0x000000000086A000-0x00000000008FF000-memory.dmp	family_expiro1
behavioral1/memory/5568-1-0x00000000007D0000-0x00000000008FF000-memory.dmp	family_expiro1
behavioral1/memory/5568-2-0x000000000086A000-0x00000000008FF000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3228	5568	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	91e218a730f3d5b8c88fdf5afb6a54b910fcc4f4c3fa0790d533accded7476b4.exe

C:\Users\Admin\AppData\Local\Temp\91e218a730f3d5b8c88fdf5afb6a54b910fcc4f4c3fa0790d533accded7476b4.exe
"C:\Users\Admin\AppData\Local\Temp\91e218a730f3d5b8c88fdf5afb6a54b910fcc4f4c3fa0790d533accded7476b4.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:5568
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5568 -s 344
  2⤵
  - Program crash
  PID:3228

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 5568 -ip 5568
1⤵
PID:4296

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/5568-0-0x000000000086A000-0x00000000008FF000-memory.dmp

Filesize
596KB

Download
memory/5568-1-0x00000000007D0000-0x00000000008FF000-memory.dmp

Filesize
1.2MB

Download
memory/5568-2-0x000000000086A000-0x00000000008FF000-memory.dmp

Filesize
596KB

Download