expiro | 94cd30d1ed5158118ca5a2e9ddf6c5478f29c602cd0249faa21e5676ba5159ae

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
11-01-2025 02:03

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General

Target

JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe
Size

7.3MB
MD5

f416871f57f67c1356f930acd0d8617f
SHA1

c4e42aee6069c4a55dc52e6c4e3d3f6249edd6d4
SHA256

94cd30d1ed5158118ca5a2e9ddf6c5478f29c602cd0249faa21e5676ba5159ae
SHA512

a0ff7aead2472368e0f6eac02a4dcbf98fef572fa4bf2b830c05eadd2b2ddfa32d9ff2afc30fb7e6a1fb07b5b73dd345f7fab3a863dab1e74f3b4347ab8114d1
SSDEEP

98304:ExC3ud6MOIvysiwCQKzo5qphIHVruP3WpF3UdE1hZHEdLFemil+:vGQFMkhgJuP32+dmhZk/k

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/2400-0-0x00000000008DE000-0x0000000000971000-memory.dmp	family_expiro1
behavioral1/memory/2400-1-0x0000000000190000-0x0000000000971000-memory.dmp	family_expiro1
behavioral1/memory/2400-2-0x00000000008DE000-0x0000000000971000-memory.dmp	family_expiro1
behavioral1/memory/2400-3-0x0000000000190000-0x0000000000971000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2548	2400	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_f416871f57f67c1356f930acd0d8617f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2400 wrote to memory of 2548	2400	JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe	30
PID 2400 wrote to memory of 2548	2400	JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe	30
PID 2400 wrote to memory of 2548	2400	JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe	30
PID 2400 wrote to memory of 2548	2400	JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f416871f57f67c1356f930acd0d8617f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2400
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2400 -s 156
  2⤵
  - Program crash
  PID:2548

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/2400-0-0x00000000008DE000-0x0000000000971000-memory.dmp

Filesize
588KB

Download
memory/2400-1-0x0000000000190000-0x0000000000971000-memory.dmp

Filesize
7.9MB

Download
memory/2400-2-0x00000000008DE000-0x0000000000971000-memory.dmp

Filesize
588KB

Download
memory/2400-3-0x0000000000190000-0x0000000000971000-memory.dmp

Filesize
7.9MB

Download