expiro | f12ada8c91c1a8e4ae0452bbf29b95866f8b2ddccffc7998ba4fbfd34bcda592

Analysis

max time kernel
103s
max time network
112s
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, 04:30

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General

Target

f12ada8c91c1a8e4ae0452bbf29b95866f8b2ddccffc7998ba4fbfd34bcda592.exe
Size

595KB
MD5

f76cb53cf4bc1020df2c760604a24438
SHA1

1937ec062107c449bdd589f1a3cbd2060f796c1f
SHA256

f12ada8c91c1a8e4ae0452bbf29b95866f8b2ddccffc7998ba4fbfd34bcda592
SHA512

b78a72255fc6082984e25eeedd48a5bcd544187d5775a59daef12b6493a167d3130620a1297906d8db18ecd73284a72e6e17f481d37d07c3745b3ec027003851
SSDEEP

12288:w7gKNkhm/JuyXnPB+h8WHHARQpeYU3UT2ODto2SCt7OdC2YAAQ:w7zNkhm5PBXn2eYsOxbt7cCm

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/4440-0-0x000000000027A000-0x000000000030D000-memory.dmp	family_expiro1
behavioral1/memory/4440-1-0x00000000001E0000-0x000000000030D000-memory.dmp	family_expiro1
behavioral1/memory/4440-2-0x000000000027A000-0x000000000030D000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3124	4440	WerFault.exe	83

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	f12ada8c91c1a8e4ae0452bbf29b95866f8b2ddccffc7998ba4fbfd34bcda592.exe

C:\Users\Admin\AppData\Local\Temp\f12ada8c91c1a8e4ae0452bbf29b95866f8b2ddccffc7998ba4fbfd34bcda592.exe
"C:\Users\Admin\AppData\Local\Temp\f12ada8c91c1a8e4ae0452bbf29b95866f8b2ddccffc7998ba4fbfd34bcda592.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4440
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4440 -s 344
  2⤵
  - Program crash
  PID:3124

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4440 -ip 4440
1⤵
PID:1316

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/4440-0-0x000000000027A000-0x000000000030D000-memory.dmp

Filesize
588KB

Download
memory/4440-1-0x00000000001E0000-0x000000000030D000-memory.dmp

Filesize
1.2MB

Download
memory/4440-2-0x000000000027A000-0x000000000030D000-memory.dmp

Filesize
588KB

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