expiro | be56f2921346ae19b867ca5f57ed1bf13ec8506f93108d2862c60a73eac8acc4

Analysis

max time kernel
104s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
11/04/2025, 22:23

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General

Target

be56f2921346ae19b867ca5f57ed1bf13ec8506f93108d2862c60a73eac8acc4.exe
Size

546KB
MD5

e48d1a21758f74566d9675dc893e52e0
SHA1

6c77a2c968865291c18eb633d8f2c9a5f1d3673c
SHA256

be56f2921346ae19b867ca5f57ed1bf13ec8506f93108d2862c60a73eac8acc4
SHA512

6a89d6a2904be431055ea8af2419b7c4e65aa5d2dbdae26ab7a216083196e877696f15f8571ccba5f3ba644346bb2a07b5687f868fb4e9bae0918ca46f87f5b9
SSDEEP

12288:geaCSCB++4YZCr1cLwDU6Lg30LI7XiV0tnw:BaCJBuiCrRg30E7yV05w

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/5204-0-0x000000000081D000-0x00000000008B0000-memory.dmp	family_expiro1
behavioral1/memory/5204-1-0x0000000000790000-0x00000000008B0000-memory.dmp	family_expiro1
behavioral1/memory/5204-2-0x000000000081D000-0x00000000008B0000-memory.dmp	family_expiro1
behavioral1/memory/5204-3-0x0000000000790000-0x00000000008B0000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3884	5204	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	be56f2921346ae19b867ca5f57ed1bf13ec8506f93108d2862c60a73eac8acc4.exe

C:\Users\Admin\AppData\Local\Temp\be56f2921346ae19b867ca5f57ed1bf13ec8506f93108d2862c60a73eac8acc4.exe
"C:\Users\Admin\AppData\Local\Temp\be56f2921346ae19b867ca5f57ed1bf13ec8506f93108d2862c60a73eac8acc4.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:5204
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5204 -s 332
  2⤵
  - Program crash
  PID:3884

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5204 -ip 5204
1⤵
PID:5456

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/5204-0-0x000000000081D000-0x00000000008B0000-memory.dmp

Filesize
588KB

Download
memory/5204-1-0x0000000000790000-0x00000000008B0000-memory.dmp

Filesize
1.1MB

Download
memory/5204-2-0x000000000081D000-0x00000000008B0000-memory.dmp

Filesize
588KB

Download
memory/5204-3-0x0000000000790000-0x00000000008B0000-memory.dmp

Filesize
1.1MB

Download