expiro | 21a8070fba92da1fc3a2f4022b03ae1ab3e214fc5c0162f5ae458b2bb99d90ef

Analysis

max time kernel
107s
max time network
114s
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, 00:26

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General

Target

21a8070fba92da1fc3a2f4022b03ae1ab3e214fc5c0162f5ae458b2bb99d90ef.exe
Size

595KB
MD5

e9e407747dbd1ac60cccaf2ebc84f4be
SHA1

120b8571c7d4c98b951ac207512432835a5e265a
SHA256

21a8070fba92da1fc3a2f4022b03ae1ab3e214fc5c0162f5ae458b2bb99d90ef
SHA512

63447c7260e270db4ecbed5f599c028e3884f6520fabc8fccfe8d5b7731de411e4328369d32f470c6287ce075a880ada44d0ec2d2de5db3282a222e2261d4973
SSDEEP

12288:J7gKNkhm/JuyXnPB+h8WHWT8tQjfF9dxJxo8dIhYt8V8tii+gIeeY:J7zNkhm5PBXD8tM9/zW8dIhY7tJ+gI

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 4 IoCs

backdoor

resource	yara_rule
behavioral1/memory/228-0-0x0000000000C0A000-0x0000000000C9D000-memory.dmp	family_expiro1
behavioral1/memory/228-1-0x0000000000B70000-0x0000000000C9D000-memory.dmp	family_expiro1
behavioral1/memory/228-2-0x0000000000C0A000-0x0000000000C9D000-memory.dmp	family_expiro1
behavioral1/memory/228-3-0x0000000000B70000-0x0000000000C9D000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
772	228	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	21a8070fba92da1fc3a2f4022b03ae1ab3e214fc5c0162f5ae458b2bb99d90ef.exe

C:\Users\Admin\AppData\Local\Temp\21a8070fba92da1fc3a2f4022b03ae1ab3e214fc5c0162f5ae458b2bb99d90ef.exe
"C:\Users\Admin\AppData\Local\Temp\21a8070fba92da1fc3a2f4022b03ae1ab3e214fc5c0162f5ae458b2bb99d90ef.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:228
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 228 -s 360
  2⤵
  - Program crash
  PID:772

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 228 -ip 228
1⤵
PID:564

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/228-0-0x0000000000C0A000-0x0000000000C9D000-memory.dmp

Filesize
588KB

Download
memory/228-1-0x0000000000B70000-0x0000000000C9D000-memory.dmp

Filesize
1.2MB

Download
memory/228-2-0x0000000000C0A000-0x0000000000C9D000-memory.dmp

Filesize
588KB

Download
memory/228-3-0x0000000000B70000-0x0000000000C9D000-memory.dmp

Filesize
1.2MB

Download