expiro | 4c954bfb172a3d928fa3ccbc9a376ca2e39203d15925be3f90d54e006e6737a0

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
31/12/2024, 20:58

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General

Target

JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe
Size

445KB
MD5

3685daebb080bcf7a4028ebe73461826
SHA1

299291291ef0dbb9e30e85c1316728a4678f8cb5
SHA256

4c954bfb172a3d928fa3ccbc9a376ca2e39203d15925be3f90d54e006e6737a0
SHA512

eb28e2dbac1bf9a49c2c03e87998e7824a57d3237ca54678870b6d21cc5e46bc921c113474f58148a814597087682750d353ce10bb554cc031ef7c217f134de0
SSDEEP

6144:p4SsuZXSvB15BjSu1oX/pisWUG9hWFPlxXSZydH9kudseypDc7t8O0YFtmXCFLH8:GuZX+cbwfU/TEEVdLqW8kF4Su

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/3048-0-0x0000000000902000-0x0000000000996000-memory.dmp	family_expiro1
behavioral1/memory/3048-1-0x0000000000890000-0x0000000000996000-memory.dmp	family_expiro1
behavioral1/memory/3048-2-0x0000000000902000-0x0000000000996000-memory.dmp	family_expiro1
behavioral1/memory/3048-3-0x0000000000890000-0x0000000000996000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3044	3048	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_3685daebb080bcf7a4028ebe73461826.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3048 wrote to memory of 3044	3048	JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe	30
PID 3048 wrote to memory of 3044	3048	JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe	30
PID 3048 wrote to memory of 3044	3048	JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe	30
PID 3048 wrote to memory of 3044	3048	JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3685daebb080bcf7a4028ebe73461826.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3048
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3048 -s 156
  2⤵
  - Program crash
  PID:3044

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/3048-0-0x0000000000902000-0x0000000000996000-memory.dmp

Filesize
592KB

Download
memory/3048-1-0x0000000000890000-0x0000000000996000-memory.dmp

Filesize
1.0MB

Download
memory/3048-2-0x0000000000902000-0x0000000000996000-memory.dmp

Filesize
592KB

Download
memory/3048-3-0x0000000000890000-0x0000000000996000-memory.dmp

Filesize
1.0MB

Download