expiro | 4e7c3947b7a01d853dcae4340fb8a35baaa57182f63b9ef0a70c6d12c1b610e5

Analysis

max time kernel
95s
max time network
96s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
06-01-2025 23:04

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General

Target

4e7c3947b7a01d853dcae4340fb8a35baaa57182f63b9ef0a70c6d12c1b610e5N.exe
Size

285KB
MD5

784c00f0696ff1247fee9f95c8a3a310
SHA1

c5d4a91236e72ebeea2092ef109a4384455292f4
SHA256

4e7c3947b7a01d853dcae4340fb8a35baaa57182f63b9ef0a70c6d12c1b610e5
SHA512

b9af02594bef91781b1b808c9786f437eb16f0ff2f3ae1639a5ccd19c716cccfd8e6063fcd5cfc26800e9b71483375c5ee45a0eb25dff6fd8d5415ebde9cf11a
SSDEEP

6144:tOWCm+/c7R8Hm2rupNeanGnHNY9kkwjSz6YdXtwO2+ynTXSjrYQImYsRaTVrG36I:rMU7R8BSgmGntY9ojy6YdmOjmbSnRImb

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 1 IoCs

backdoor

resource	yara_rule
behavioral2/memory/1524-1-0x0000000001000000-0x0000000001096000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1020	1524	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	4e7c3947b7a01d853dcae4340fb8a35baaa57182f63b9ef0a70c6d12c1b610e5N.exe

C:\Users\Admin\AppData\Local\Temp\4e7c3947b7a01d853dcae4340fb8a35baaa57182f63b9ef0a70c6d12c1b610e5N.exe
"C:\Users\Admin\AppData\Local\Temp\4e7c3947b7a01d853dcae4340fb8a35baaa57182f63b9ef0a70c6d12c1b610e5N.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:1524
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1524 -s 212
  2⤵
  - Program crash
  PID:1020

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1524 -ip 1524
1⤵
PID:4168

Network

MITRE ATT&CK Enterprise v15

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

Replay Monitor

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Downloads

memory/1524-0-0x0000000001000000-0x0000000001096000-memory.dmp

Filesize
600KB

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memory/1524-1-0x0000000001000000-0x0000000001096000-memory.dmp

Filesize
600KB

Download