expiro | 92dba41668a4f4741e8163268e26e901c05ce5fc1c663a8cc6cbf13a7d499569

Analysis

max time kernel
120s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 01:06

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General

Target

JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe
Size

7.3MB
MD5

8175fa3dd58315a59636b79420c774d6
SHA1

9518cabc1536ddcb9aa6181fa6f9172ec95bf634
SHA256

92dba41668a4f4741e8163268e26e901c05ce5fc1c663a8cc6cbf13a7d499569
SHA512

21b2d3f3de240e1e1e173fa6993ea01525a432207c66a3d22f4cc0d5b133efb622f9c7f985236363f71c460f7adfefe59676be433de5604f36d6b9d6fd46ca4f
SSDEEP

98304:ExC3ud6MOIvysiwCQKzo5qphIHVruP3WpF3UdE1hZHEdLFfmil+:vGQFMkhgJuP32+dmhZk/B

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/2692-0-0x00000000010AE000-0x0000000001141000-memory.dmp	family_expiro1
behavioral1/memory/2692-1-0x0000000000960000-0x0000000001141000-memory.dmp	family_expiro1
behavioral1/memory/2692-2-0x00000000010AE000-0x0000000001141000-memory.dmp	family_expiro1
behavioral1/memory/2692-3-0x0000000000960000-0x0000000001141000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2156	2692	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_8175fa3dd58315a59636b79420c774d6.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2692 wrote to memory of 2156	2692	JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe	30
PID 2692 wrote to memory of 2156	2692	JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe	30
PID 2692 wrote to memory of 2156	2692	JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe	30
PID 2692 wrote to memory of 2156	2692	JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8175fa3dd58315a59636b79420c774d6.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2692
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2692 -s 156
  2⤵
  - Program crash
  PID:2156

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/2692-0-0x00000000010AE000-0x0000000001141000-memory.dmp

Filesize
588KB

Download
memory/2692-1-0x0000000000960000-0x0000000001141000-memory.dmp

Filesize
7.9MB

Download
memory/2692-2-0x00000000010AE000-0x0000000001141000-memory.dmp

Filesize
588KB

Download
memory/2692-3-0x0000000000960000-0x0000000001141000-memory.dmp

Filesize
7.9MB

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