expiro | 2d54f3ad3067084cc1fe5abac3bce7f791f6d0b772df74911648d680ac2c6552

Analysis

max time kernel
122s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03-01-2025 08:29

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General

Target

JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe
Size

7.3MB
MD5

6b6177f3fa2164a5df5827fb67cea3e6
SHA1

2a7ee7bff60941202f95d563ee92631fb3ecb6d5
SHA256

2d54f3ad3067084cc1fe5abac3bce7f791f6d0b772df74911648d680ac2c6552
SHA512

20fea8205f9a9056f98f36af42d12b54732c8317a0acd4b4b090004ede97d9f4d5d846f3aa190b729902655c9e85d7bd955d1eb27d94afb6c87d992bab187d3c
SSDEEP

98304:BxC3ud6MOIvysiwCQKzo5qphIHVruP3WpF3UdE1hZHEdLFqmil+:2GQFMkhgJuP32+dmhZk/I

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/2380-0-0x00000000016EE000-0x0000000001781000-memory.dmp	family_expiro1
behavioral1/memory/2380-1-0x0000000000FA0000-0x0000000001781000-memory.dmp	family_expiro1
behavioral1/memory/2380-2-0x00000000016EE000-0x0000000001781000-memory.dmp	family_expiro1
behavioral1/memory/2380-3-0x0000000000FA0000-0x0000000001781000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2096	2380	WerFault.exe	30

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_6b6177f3fa2164a5df5827fb67cea3e6.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 2096	2380	JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe	31
PID 2380 wrote to memory of 2096	2380	JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe	31
PID 2380 wrote to memory of 2096	2380	JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe	31
PID 2380 wrote to memory of 2096	2380	JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b6177f3fa2164a5df5827fb67cea3e6.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2380
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2380 -s 156
  2⤵
  - Program crash
  PID:2096

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/2380-0-0x00000000016EE000-0x0000000001781000-memory.dmp

Filesize
588KB

Download
memory/2380-1-0x0000000000FA0000-0x0000000001781000-memory.dmp

Filesize
7.9MB

Download
memory/2380-2-0x00000000016EE000-0x0000000001781000-memory.dmp

Filesize
588KB

Download
memory/2380-3-0x0000000000FA0000-0x0000000001781000-memory.dmp

Filesize
7.9MB

Download