expiro | b4a2f3c3d5d4dd3ed6f06be4a6061e9b4e67e4a3c5fc8fae2ec4f93819b6a65e

Analysis

max time kernel
95s
max time network
101s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-01-2025 22:58

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General

Target

b4a2f3c3d5d4dd3ed6f06be4a6061e9b4e67e4a3c5fc8fae2ec4f93819b6a65e.exe
Size

285KB
MD5

34dea003bd27772ff052e54a35bb1756
SHA1

2fc579540210d36b90c209af5ea98b7b3d4d6d55
SHA256

b4a2f3c3d5d4dd3ed6f06be4a6061e9b4e67e4a3c5fc8fae2ec4f93819b6a65e
SHA512

8161f2c78f156c77d39f19c2398cec1986afa6e500ee94648ad6071eda761eeeec8d78c2e0cfaf53b1ec603e954ffc65a07325af34a04c58e37fa316f764eb5b
SSDEEP

6144:tOWCm+/c7R8Hm2rupNeanGnHNY9kkwjSz6YdXtwO2+ynTXSjrYQImYsRaTVrG36e:rMU7R8BSgmGntY9ojy6YdmOjmbSnRIm3

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/4332-1-0x0000000001000000-0x0000000001096000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
216	4332	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	b4a2f3c3d5d4dd3ed6f06be4a6061e9b4e67e4a3c5fc8fae2ec4f93819b6a65e.exe

C:\Users\Admin\AppData\Local\Temp\b4a2f3c3d5d4dd3ed6f06be4a6061e9b4e67e4a3c5fc8fae2ec4f93819b6a65e.exe
"C:\Users\Admin\AppData\Local\Temp\b4a2f3c3d5d4dd3ed6f06be4a6061e9b4e67e4a3c5fc8fae2ec4f93819b6a65e.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4332
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4332 -s 248
  2⤵
  - Program crash
  PID:216

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4332 -ip 4332
1⤵
PID:1236

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/4332-0-0x0000000001000000-0x0000000001096000-memory.dmp

Filesize
600KB

Download
memory/4332-1-0x0000000001000000-0x0000000001096000-memory.dmp

Filesize
600KB

Download