expiro | a7480b4859992fb8658e0c577a12fc97cc0397e7e1d7ac73ccc3ce273cdfc03c

Analysis

max time kernel
91s
max time network
93s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
02-02-2025 05:59

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General

Target

a7480b4859992fb8658e0c577a12fc97cc0397e7e1d7ac73ccc3ce273cdfc03c.exe
Size

599KB
MD5

71965ebd464a0622b706ece33e10e654
SHA1

06b3294947db02f2edae0483ed8ffce296008df0
SHA256

a7480b4859992fb8658e0c577a12fc97cc0397e7e1d7ac73ccc3ce273cdfc03c
SHA512

6ece8e982f1283d42e4fe595ccadea4e7648e1da9c1988b2d5f98f369f11a83f81a63930de9807d12c3748eee84f6efa176eb1074fee03e360b979a5c3ab7bd3
SSDEEP

12288:b7gKNkhm/JuyXnPB+h8WHjCCkckzXQaO/YwakJVHoaczGt:b7zNkhm5PBXZfrLw/czG

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
behavioral2/memory/5044-0-0x000000000080B000-0x000000000089E000-memory.dmp	family_expiro1
behavioral2/memory/5044-1-0x0000000000770000-0x000000000089E000-memory.dmp	family_expiro1
behavioral2/memory/5044-2-0x000000000080B000-0x000000000089E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
864	5044	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	a7480b4859992fb8658e0c577a12fc97cc0397e7e1d7ac73ccc3ce273cdfc03c.exe

C:\Users\Admin\AppData\Local\Temp\a7480b4859992fb8658e0c577a12fc97cc0397e7e1d7ac73ccc3ce273cdfc03c.exe
"C:\Users\Admin\AppData\Local\Temp\a7480b4859992fb8658e0c577a12fc97cc0397e7e1d7ac73ccc3ce273cdfc03c.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:5044
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5044 -s 340
  2⤵
  - Program crash
  PID:864

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5044 -ip 5044
1⤵
PID:3976

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/5044-0-0x000000000080B000-0x000000000089E000-memory.dmp

Filesize
588KB

Download
memory/5044-1-0x0000000000770000-0x000000000089E000-memory.dmp

Filesize
1.2MB

Download
memory/5044-2-0x000000000080B000-0x000000000089E000-memory.dmp

Filesize
588KB

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