expiro | 996e5efc9b237987fd55bee25eb11c91c8fe78bded5e6fecefce27ba19e94bb8

Analysis

max time kernel
116s
max time network
112s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
14/04/2025, 13:22

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General

Target

996e5efc9b237987fd55bee25eb11c91c8fe78bded5e6fecefce27ba19e94bb8.exe
Size

599KB
MD5

8bbb3142aa209216d3c2a48fc5e3534f
SHA1

b38bac35adaadf1ae397f1e12916d1a01255cf12
SHA256

996e5efc9b237987fd55bee25eb11c91c8fe78bded5e6fecefce27ba19e94bb8
SHA512

470ec8ae1122cec86fbdaba50a27396bf67fe8acc95689fcbb58983dd05a410a6e40ab1b6ece7195a7231ef340328132003a5010363e3dd9e525dfc3fc1782b0
SSDEEP

12288:o7gKNkhm/JuyXnPB+h8WHUG8g4vHjLMdD8FzuoG/des6:o7zNkhm5PBXzXnGdeR

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
behavioral1/memory/5828-0-0x0000000000BCA000-0x0000000000C5F000-memory.dmp	family_expiro1
behavioral1/memory/5828-1-0x0000000000B30000-0x0000000000C5F000-memory.dmp	family_expiro1
behavioral1/memory/5828-2-0x0000000000BCA000-0x0000000000C5F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1816	5828	WerFault.exe	84

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	996e5efc9b237987fd55bee25eb11c91c8fe78bded5e6fecefce27ba19e94bb8.exe

C:\Users\Admin\AppData\Local\Temp\996e5efc9b237987fd55bee25eb11c91c8fe78bded5e6fecefce27ba19e94bb8.exe
"C:\Users\Admin\AppData\Local\Temp\996e5efc9b237987fd55bee25eb11c91c8fe78bded5e6fecefce27ba19e94bb8.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:5828
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5828 -s 344
  2⤵
  - Program crash
  PID:1816

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 5828 -ip 5828
1⤵
PID:2928

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

Replay Monitor

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Downloads

memory/5828-0-0x0000000000BCA000-0x0000000000C5F000-memory.dmp

Filesize
596KB

Download
memory/5828-1-0x0000000000B30000-0x0000000000C5F000-memory.dmp

Filesize
1.2MB

Download
memory/5828-2-0x0000000000BCA000-0x0000000000C5F000-memory.dmp

Filesize
596KB

Download