expiro | ec23ca27e96b36d72eeacac9c4f49a40c1a1c80c01c32d48d74f5699260762ad

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-01-2025 05:24

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General

Target

JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe
Size

476KB
MD5

8dd38b2b26e674da1828d3d8e8f6f8f1
SHA1

8139214d9fbefc93a535bbc524c647b0e4ac585a
SHA256

ec23ca27e96b36d72eeacac9c4f49a40c1a1c80c01c32d48d74f5699260762ad
SHA512

44b205c42ea992dac63f139ccd1a2bee56fa730dcdf9bd06fb4e12cb73482be9eeec0d64a47af517393ca5470221f4de6229b4e02247bbee03d41543bee5b214
SSDEEP

12288:0YmIjE7eNdKcWEb32Ubr4TgyUbZm6qCs8e/G:k7eNAYb32Ub8T5geL

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/2112-0-0x000000000110B000-0x000000000119F000-memory.dmp	family_expiro1
behavioral1/memory/2112-1-0x0000000001090000-0x000000000119F000-memory.dmp	family_expiro1
behavioral1/memory/2112-2-0x000000000110B000-0x000000000119F000-memory.dmp	family_expiro1
behavioral1/memory/2112-3-0x0000000001090000-0x000000000119F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2836	2112	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_8dd38b2b26e674da1828d3d8e8f6f8f1.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 2836	2112	JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe	32
PID 2112 wrote to memory of 2836	2112	JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe	32
PID 2112 wrote to memory of 2836	2112	JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe	32
PID 2112 wrote to memory of 2836	2112	JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8dd38b2b26e674da1828d3d8e8f6f8f1.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2112
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2112 -s 144
  2⤵
  - Program crash
  PID:2836

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/2112-0-0x000000000110B000-0x000000000119F000-memory.dmp

Filesize
592KB

Download
memory/2112-1-0x0000000001090000-0x000000000119F000-memory.dmp

Filesize
1.1MB

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memory/2112-2-0x000000000110B000-0x000000000119F000-memory.dmp

Filesize
592KB

Download
memory/2112-3-0x0000000001090000-0x000000000119F000-memory.dmp

Filesize
1.1MB

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