expiro | 9b75ef6d90e8ddd17b0eff86d3cb290e56bddd71f061f550083b30131013457f

Analysis

max time kernel
118s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
01-01-2025 17:53

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General

Target

JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe
Size

415KB
MD5

5ecef7bab04f899f8d7e48f7364157fe
SHA1

03f57444f09777c28d249c82e76802205c00b72f
SHA256

9b75ef6d90e8ddd17b0eff86d3cb290e56bddd71f061f550083b30131013457f
SHA512

96bd5ec347991eb456d9571405209e7443fa7296b980aea0de7db1ebd3dd6f036fe83bbd7475e8e5dce8e940646c32d5e4ae5b56d6b7faa2660a4d7b1a95ebe8
SSDEEP

12288:e/ZXJuQ3m9MNYAqUtNNoCBII/OUf5DOK:6J3meYAqUtNeCCI1f5Z

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/2772-0-0x00000000009FB000-0x0000000000A8E000-memory.dmp	family_expiro1
behavioral1/memory/2772-1-0x0000000000990000-0x0000000000A8E000-memory.dmp	family_expiro1
behavioral1/memory/2772-2-0x00000000009FB000-0x0000000000A8E000-memory.dmp	family_expiro1
behavioral1/memory/2772-3-0x0000000000990000-0x0000000000A8E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2812	2772	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_5ecef7bab04f899f8d7e48f7364157fe.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2772 wrote to memory of 2812	2772	JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe	31
PID 2772 wrote to memory of 2812	2772	JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe	31
PID 2772 wrote to memory of 2812	2772	JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe	31
PID 2772 wrote to memory of 2812	2772	JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5ecef7bab04f899f8d7e48f7364157fe.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2772
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2772 -s 64
  2⤵
  - Program crash
  PID:2812

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/2772-0-0x00000000009FB000-0x0000000000A8E000-memory.dmp

Filesize
588KB

Download
memory/2772-1-0x0000000000990000-0x0000000000A8E000-memory.dmp

Filesize
1016KB

Download
memory/2772-2-0x00000000009FB000-0x0000000000A8E000-memory.dmp

Filesize
588KB

Download
memory/2772-3-0x0000000000990000-0x0000000000A8E000-memory.dmp

Filesize
1016KB

Download