expiro | 3b76dc871a640eece981ec21301a41ca2ad8bd697c8276f26c8926fd211e9bc4

Analysis

max time kernel
14s
max time network
18s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
07/01/2025, 09:14

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General

Target

JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe
Size

417KB
MD5

5a6fad66b8af900b6def3c15532543ac
SHA1

5a787849c3023858258337686488d391defa1bff
SHA256

3b76dc871a640eece981ec21301a41ca2ad8bd697c8276f26c8926fd211e9bc4
SHA512

38d78893fe4f2be9915bdfc9d650151d09141ed89f7ee028d1849853f7309b17983ad8be3c21cc1c4ff1c7168b352403e0e1b462ce87b4153838efb173c84cb7
SSDEEP

6144:OSpwTEOzPSK5U2SoJ8VWackgV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:R+IK5U2SoysLmwLQcUqgsPBYv745B

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/2936-0-0x0000000000DCC000-0x0000000000E5F000-memory.dmp	family_expiro1
behavioral1/memory/2936-1-0x0000000000D60000-0x0000000000E5F000-memory.dmp	family_expiro1
behavioral1/memory/2936-2-0x0000000000DCC000-0x0000000000E5F000-memory.dmp	family_expiro1
behavioral1/memory/2936-3-0x0000000000D60000-0x0000000000E5F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2584	2936	WerFault.exe	29

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_5a6fad66b8af900b6def3c15532543ac.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2936 wrote to memory of 2584	2936	JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe	30
PID 2936 wrote to memory of 2584	2936	JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe	30
PID 2936 wrote to memory of 2584	2936	JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe	30
PID 2936 wrote to memory of 2584	2936	JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5a6fad66b8af900b6def3c15532543ac.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2936
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2936 -s 68
  2⤵
  - Program crash
  PID:2584

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

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Downloads

memory/2936-0-0x0000000000DCC000-0x0000000000E5F000-memory.dmp

Filesize
588KB

Download
memory/2936-1-0x0000000000D60000-0x0000000000E5F000-memory.dmp

Filesize
1020KB

Download
memory/2936-2-0x0000000000DCC000-0x0000000000E5F000-memory.dmp

Filesize
588KB

Download
memory/2936-3-0x0000000000D60000-0x0000000000E5F000-memory.dmp

Filesize
1020KB

Download