expiro | c1b08fcce68c53c9293f7bbd8a3eea58fe6fa756466bbd92d6818d62ab39447b

Analysis

max time kernel
104s
max time network
139s
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, 03:32

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General

Target

c1b08fcce68c53c9293f7bbd8a3eea58fe6fa756466bbd92d6818d62ab39447b.exe
Size

483KB
MD5

f3ebb7578895b1a48ce9b83abab51fe9
SHA1

9931790d2b70076bedbe39db000ccfa89a25b4b6
SHA256

c1b08fcce68c53c9293f7bbd8a3eea58fe6fa756466bbd92d6818d62ab39447b
SHA512

84e6d72f7bd9d2ace5c9d5756acf72ed7e209edb14877a726f5ff2b6dc82a4fce451f3cfdd0f4a62917145a312c0492c30117057af8b87d16deea5fed95fb2c6
SSDEEP

12288:O2ouX5dZxGq/qn/DRCV98LyO9LwKGaTW5Wxd7BU:OCZ1q/VE693hXBU

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/4612-0-0x0000000000A0E000-0x0000000000AA1000-memory.dmp	family_expiro1
behavioral1/memory/4612-1-0x0000000000990000-0x0000000000AA1000-memory.dmp	family_expiro1
behavioral1/memory/4612-2-0x0000000000A0E000-0x0000000000AA1000-memory.dmp	family_expiro1
behavioral1/memory/4612-3-0x0000000000990000-0x0000000000AA1000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
5216	4612	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	c1b08fcce68c53c9293f7bbd8a3eea58fe6fa756466bbd92d6818d62ab39447b.exe

C:\Users\Admin\AppData\Local\Temp\c1b08fcce68c53c9293f7bbd8a3eea58fe6fa756466bbd92d6818d62ab39447b.exe
"C:\Users\Admin\AppData\Local\Temp\c1b08fcce68c53c9293f7bbd8a3eea58fe6fa756466bbd92d6818d62ab39447b.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4612
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4612 -s 396
  2⤵
  - Program crash
  PID:5216

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 4612 -ip 4612
1⤵
PID:1372

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/4612-0-0x0000000000A0E000-0x0000000000AA1000-memory.dmp

Filesize
588KB

Download
memory/4612-1-0x0000000000990000-0x0000000000AA1000-memory.dmp

Filesize
1.1MB

Download
memory/4612-2-0x0000000000A0E000-0x0000000000AA1000-memory.dmp

Filesize
588KB

Download
memory/4612-3-0x0000000000990000-0x0000000000AA1000-memory.dmp

Filesize
1.1MB

Download