expiro | 87532e5dc6dc6c22c35936f1b0acf316131286eeedb0250c10672884c5536462

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
05-01-2025 18:49

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General

Target

JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe
Size

415KB
MD5

b7ad1b18cee6c7c187700341960dafbc
SHA1

4f57fc45b620213a1700e693392a4524421ee334
SHA256

87532e5dc6dc6c22c35936f1b0acf316131286eeedb0250c10672884c5536462
SHA512

91cc2d2f076f229d4c625a38ab4abd3480059c5c5b15b197f6b4f0bbf6e13699bb44877c1052cad57d0a05044d76890b05b5dbcaf1ad97594043317e34339e4a
SSDEEP

12288:kuo6FBezd5fmoKItmXyJLBeXptVP1kmijJ:kwFBSd5FLu96J

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/2632-0-0x00000000004EB000-0x000000000057E000-memory.dmp	family_expiro1
behavioral1/memory/2632-1-0x0000000000480000-0x000000000057E000-memory.dmp	family_expiro1
behavioral1/memory/2632-2-0x00000000004EB000-0x000000000057E000-memory.dmp	family_expiro1
behavioral1/memory/2632-3-0x0000000000480000-0x000000000057E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2752	2632	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_b7ad1b18cee6c7c187700341960dafbc.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2632 wrote to memory of 2752	2632	JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe	31
PID 2632 wrote to memory of 2752	2632	JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe	31
PID 2632 wrote to memory of 2752	2632	JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe	31
PID 2632 wrote to memory of 2752	2632	JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b7ad1b18cee6c7c187700341960dafbc.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2632
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2632 -s 64
  2⤵
  - Program crash
  PID:2752

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/2632-0-0x00000000004EB000-0x000000000057E000-memory.dmp

Filesize
588KB

Download
memory/2632-1-0x0000000000480000-0x000000000057E000-memory.dmp

Filesize
1016KB

Download
memory/2632-2-0x00000000004EB000-0x000000000057E000-memory.dmp

Filesize
588KB

Download
memory/2632-3-0x0000000000480000-0x000000000057E000-memory.dmp

Filesize
1016KB

Download