expiro | b5562b3ad2c329bed397168e791ff9361b1505e116df3a0a48161d725ff1040b

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10-01-2025 00:29

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General

Target

JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe
Size

19.5MB
MD5

d647915403eae58d3ed7685078cbaaef
SHA1

28e176959520ceb24544775a22ff435817e21194
SHA256

b5562b3ad2c329bed397168e791ff9361b1505e116df3a0a48161d725ff1040b
SHA512

a7fa7e3226162342984583bf212ed9bd634702b2c45950491b52f8b98c81d32fb1e63ceb5b2d0ca8657183a27d319fd359751227a30c0d6dfc714f9be15dcb94
SSDEEP

393216:emHZI2hMQdB7H/hUfaCVjTPEtOSNVW8ImMyX5/4BaPBr7rt2RqJ:p1M4B7CC2AtjXImNXZ4c5kRq

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/2272-0-0x000000000149B000-0x000000000152E000-memory.dmp	family_expiro1
behavioral1/memory/2272-1-0x0000000000110000-0x000000000152E000-memory.dmp	family_expiro1
behavioral1/memory/2272-2-0x000000000149B000-0x000000000152E000-memory.dmp	family_expiro1
behavioral1/memory/2272-3-0x0000000000110000-0x000000000152E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2484	2272	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_d647915403eae58d3ed7685078cbaaef.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2272 wrote to memory of 2484	2272	JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe	30
PID 2272 wrote to memory of 2484	2272	JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe	30
PID 2272 wrote to memory of 2484	2272	JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe	30
PID 2272 wrote to memory of 2484	2272	JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d647915403eae58d3ed7685078cbaaef.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2272
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2272 -s 124
  2⤵
  - Program crash
  PID:2484

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/2272-0-0x000000000149B000-0x000000000152E000-memory.dmp

Filesize
588KB

Download
memory/2272-1-0x0000000000110000-0x000000000152E000-memory.dmp

Filesize
20.1MB

Download
memory/2272-2-0x000000000149B000-0x000000000152E000-memory.dmp

Filesize
588KB

Download
memory/2272-3-0x0000000000110000-0x000000000152E000-memory.dmp

Filesize
20.1MB

Download