expiro | 1dbd9fa5403a7fd28a7e3e69d10c7d6a61a697de3698cb60df74ec083d95ed6f

Analysis

max time kernel
104s
max time network
125s
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, 05:23

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General

Target

1dbd9fa5403a7fd28a7e3e69d10c7d6a61a697de3698cb60df74ec083d95ed6f.exe
Size

595KB
MD5

fbc4ad1dfc0deb901ab638a16cb31440
SHA1

90cf68ad869b12fdbb7f54a9dc1f320129f1d615
SHA256

1dbd9fa5403a7fd28a7e3e69d10c7d6a61a697de3698cb60df74ec083d95ed6f
SHA512

23abc8bfaa57152a11f7ef83e149d5a38f90408ec021899d5b0b27f8c619fe2619c311fee8ce5f3c9e11c4d911850fbd748ef79243c4ae88436395ac8353d6a2
SSDEEP

12288:57gKNkhm/JuyXnPB+h8WH8IYjPVMqdW7fpcmEQ:57zNkhm5PBXRzPqqdW7fp

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/4312-0-0x000000000051A000-0x00000000005AD000-memory.dmp	family_expiro1
behavioral1/memory/4312-1-0x0000000000480000-0x00000000005AD000-memory.dmp	family_expiro1
behavioral1/memory/4312-2-0x000000000051A000-0x00000000005AD000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
6012	4312	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	1dbd9fa5403a7fd28a7e3e69d10c7d6a61a697de3698cb60df74ec083d95ed6f.exe

C:\Users\Admin\AppData\Local\Temp\1dbd9fa5403a7fd28a7e3e69d10c7d6a61a697de3698cb60df74ec083d95ed6f.exe
"C:\Users\Admin\AppData\Local\Temp\1dbd9fa5403a7fd28a7e3e69d10c7d6a61a697de3698cb60df74ec083d95ed6f.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4312
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4312 -s 360
  2⤵
  - Program crash
  PID:6012

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4312 -ip 4312
1⤵
PID:1072

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/4312-0-0x000000000051A000-0x00000000005AD000-memory.dmp

Filesize
588KB

Download
memory/4312-1-0x0000000000480000-0x00000000005AD000-memory.dmp

Filesize
1.2MB

Download
memory/4312-2-0x000000000051A000-0x00000000005AD000-memory.dmp

Filesize
588KB

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