expiro | 4e4b4f84791a5ab9aff7089866891be256bdff4494599e8e9855207cda0fe348

Analysis

max time kernel
94s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-01-2025 21:55

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General

Target

4e4b4f84791a5ab9aff7089866891be256bdff4494599e8e9855207cda0fe348.exe
Size

474KB
MD5

63ef774c8b7f7240c2c6108d2561c073
SHA1

ab6c8738ebff7ffc496faa609f737f3a990f5fa1
SHA256

4e4b4f84791a5ab9aff7089866891be256bdff4494599e8e9855207cda0fe348
SHA512

90882b0522de5f8d31cbae7c3b9068bf57dd3343b39837db90835ee7a095bcb318df0bccfe868bcffc74994cbbfeca6bbf071783a4856417a93eb4f2a943e0fc
SSDEEP

12288:eMxjNtKUY1Ks3VmKVAy3OdLNKVPXTOXLi0yvASH+w:eMx/KUYcs3VmKP3ONNKMi9vASew

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
behavioral2/memory/1404-1-0x0000000000400000-0x0000000000592000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4536	1404	WerFault.exe	82

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	4e4b4f84791a5ab9aff7089866891be256bdff4494599e8e9855207cda0fe348.exe

C:\Users\Admin\AppData\Local\Temp\4e4b4f84791a5ab9aff7089866891be256bdff4494599e8e9855207cda0fe348.exe
"C:\Users\Admin\AppData\Local\Temp\4e4b4f84791a5ab9aff7089866891be256bdff4494599e8e9855207cda0fe348.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:1404
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1404 -s 516
  2⤵
  - Program crash
  PID:4536

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1404 -ip 1404
1⤵
PID:1424

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

Replay Monitor

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Downloads

memory/1404-0-0x0000000000400000-0x0000000000592000-memory.dmp

Filesize
1.6MB

Download
memory/1404-1-0x0000000000400000-0x0000000000592000-memory.dmp

Filesize
1.6MB

Download