expiro | 79b097f4358e2b8467ac5a03bcd71adc45afd5840d51815df33032a1f0f15f2a

Analysis

max time kernel
149s
max time network
150s
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 08:26

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General

Target

JaffaCakes118_1908fe82c4e0f05a6053d81311915f88.exe
Size

604KB
MD5

1908fe82c4e0f05a6053d81311915f88
SHA1

0c8dc9169480dc887cb9cf5ac386d8974e81e343
SHA256

79b097f4358e2b8467ac5a03bcd71adc45afd5840d51815df33032a1f0f15f2a
SHA512

5dfe05df5008ce822857e2b73603077197a91636d11cb2974e2b5e45f6c1487f2691b4e2b38f79b97bee8feeb4771d67021b53a77be4f950064f6e18b9c2783a
SSDEEP

12288:TCtf/2eiJuOaxnswVWsvQnm0AfZT35cirW8049fa7Nq+GHgV:TCpepUOapHQnr6VRf0Ea7mgV

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/4876-0-0x000000000101E000-0x00000000010B1000-memory.dmp	family_expiro1
behavioral2/memory/4876-1-0x0000000000F80000-0x00000000010B1000-memory.dmp	family_expiro1
behavioral2/memory/4876-2-0x000000000101E000-0x00000000010B1000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
5060	4876	WerFault.exe	81

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	JaffaCakes118_1908fe82c4e0f05a6053d81311915f88.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_1908fe82c4e0f05a6053d81311915f88.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_1908fe82c4e0f05a6053d81311915f88.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4876
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4876 -s 476
  2⤵
  - Program crash
  PID:5060

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4876 -ip 4876
1⤵
PID:3324

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/4876-0-0x000000000101E000-0x00000000010B1000-memory.dmp

Filesize
588KB

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memory/4876-1-0x0000000000F80000-0x00000000010B1000-memory.dmp

Filesize
1.2MB

Download
memory/4876-2-0x000000000101E000-0x00000000010B1000-memory.dmp

Filesize
588KB

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