expiro | 5a29a87970e34446b10d1d086dcc8f7d63e0ba81f056069f408241524dfff1c2

Analysis

max time kernel
16s
max time network
17s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
07-01-2025 02:35

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General

Target

JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe
Size

415KB
MD5

48a44da7bd2a44d0385fe49e47d7773f
SHA1

010d97575d6f6256d519a4de36f0da80268aea11
SHA256

5a29a87970e34446b10d1d086dcc8f7d63e0ba81f056069f408241524dfff1c2
SHA512

6f2f75599df1d3a12596a0b0dcd15d94afa1ac0a5b00444204e4587745ac1577ee5e53cfb9983e04867c72606c36eba6533cad29189a2e87fe06f56c8553152b
SSDEEP

6144:gDqKw1IUg3hoPlDL8hB5L6YoVXGI/JbGpdfAyGQMTyum89mrwzn/rXt9/BBjkPRS:XyUg3hthD61GI/VGJMTyum9mx9/zjz

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/2144-0-0x0000000000FCB000-0x000000000105E000-memory.dmp	family_expiro1
behavioral1/memory/2144-1-0x0000000000F60000-0x000000000105E000-memory.dmp	family_expiro1
behavioral1/memory/2144-2-0x0000000000FCB000-0x000000000105E000-memory.dmp	family_expiro1
behavioral1/memory/2144-3-0x0000000000F60000-0x000000000105E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2952	2144	WerFault.exe	28

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_48a44da7bd2a44d0385fe49e47d7773f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2144 wrote to memory of 2952	2144	JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe	30
PID 2144 wrote to memory of 2952	2144	JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe	30
PID 2144 wrote to memory of 2952	2144	JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe	30
PID 2144 wrote to memory of 2952	2144	JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_48a44da7bd2a44d0385fe49e47d7773f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2144
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2144 -s 64
  2⤵
  - Program crash
  PID:2952

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/2144-0-0x0000000000FCB000-0x000000000105E000-memory.dmp

Filesize
588KB

Download
memory/2144-1-0x0000000000F60000-0x000000000105E000-memory.dmp

Filesize
1016KB

Download
memory/2144-2-0x0000000000FCB000-0x000000000105E000-memory.dmp

Filesize
588KB

Download
memory/2144-3-0x0000000000F60000-0x000000000105E000-memory.dmp

Filesize
1016KB

Download