expiro | f0b4ea90c5715ddafe2087e087da6dbebc8e76be6127101be6c9bacb53404291

Analysis

max time kernel
106s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
12/04/2025, 02:33

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General

Target

f0b4ea90c5715ddafe2087e087da6dbebc8e76be6127101be6c9bacb53404291.exe
Size

599KB
MD5

f2da7a9311c0b6f11dad7f7ed8e09290
SHA1

b2ae03b8d9d68bf6834bb63f1c3ab166b0725065
SHA256

f0b4ea90c5715ddafe2087e087da6dbebc8e76be6127101be6c9bacb53404291
SHA512

0ebf39eadfaeb9c1e3169c61ce02d9b0e8c645d25caf7d40dd51bae123d36c0ee225e61697c83e107ff16f79ae35dd4db300c997d9aebb175a552428d6a05b3f
SSDEEP

12288:U7gKNkhm/JuyXnPB+h8WHhTi5yjvpf2DPRO/GuqBVf7JL8geQwAU3TO:U7zNkhm5PB3Wpf2DPRp3VuD

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/3232-0-0x0000000000E2B000-0x0000000000E5B000-memory.dmp	family_expiro1
behavioral1/memory/3232-1-0x0000000000D90000-0x0000000000E5B000-memory.dmp	family_expiro1
behavioral1/memory/3232-2-0x0000000000E2B000-0x0000000000E5B000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3960	3232	WerFault.exe	85

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	f0b4ea90c5715ddafe2087e087da6dbebc8e76be6127101be6c9bacb53404291.exe

C:\Users\Admin\AppData\Local\Temp\f0b4ea90c5715ddafe2087e087da6dbebc8e76be6127101be6c9bacb53404291.exe
"C:\Users\Admin\AppData\Local\Temp\f0b4ea90c5715ddafe2087e087da6dbebc8e76be6127101be6c9bacb53404291.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:3232
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3232 -s 352
  2⤵
  - Program crash
  PID:3960

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3232 -ip 3232
1⤵
PID:5516

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/3232-0-0x0000000000E2B000-0x0000000000E5B000-memory.dmp

Filesize
192KB

Download
memory/3232-1-0x0000000000D90000-0x0000000000E5B000-memory.dmp

Filesize
812KB

Download
memory/3232-2-0x0000000000E2B000-0x0000000000E5B000-memory.dmp

Filesize
192KB

Download