expiro | b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3

Analysis

max time kernel
122s
max time network
124s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
01/01/2025, 17:13

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General

Target

JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe
Size

476KB
MD5

5d9afa34d58d686ea27ab01f4f681d56
SHA1

4301075acafdd765528e91950c6a89b96889d97c
SHA256

b173b03e0988654a331c46e31e2438115d34fc57a7550a66aee784d1e74300d3
SHA512

7912d1190a6d440d906c7cd908ff03d95187b894f469fc1cda0dcf985e61b74e376cd41e39fdac582e438f1c10e4be63c53e1943986943081b97cc99c72a2934
SSDEEP

12288:yYmIjE7eNdKcWEb92Ubr4TgyUbZm6qCs8e/G:O7eNAYb92Ub8T5geL

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/2256-0-0x0000000000D5B000-0x0000000000DEF000-memory.dmp	family_expiro1
behavioral1/memory/2256-1-0x0000000000CE0000-0x0000000000DEF000-memory.dmp	family_expiro1
behavioral1/memory/2256-2-0x0000000000D5B000-0x0000000000DEF000-memory.dmp	family_expiro1
behavioral1/memory/2256-3-0x0000000000CE0000-0x0000000000DEF000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2128	2256	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_5d9afa34d58d686ea27ab01f4f681d56.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2256 wrote to memory of 2128	2256	JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe	31
PID 2256 wrote to memory of 2128	2256	JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe	31
PID 2256 wrote to memory of 2128	2256	JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe	31
PID 2256 wrote to memory of 2128	2256	JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5d9afa34d58d686ea27ab01f4f681d56.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2256
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2256 -s 144
  2⤵
  - Program crash
  PID:2128

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/2256-0-0x0000000000D5B000-0x0000000000DEF000-memory.dmp

Filesize
592KB

Download
memory/2256-1-0x0000000000CE0000-0x0000000000DEF000-memory.dmp

Filesize
1.1MB

Download
memory/2256-2-0x0000000000D5B000-0x0000000000DEF000-memory.dmp

Filesize
592KB

Download
memory/2256-3-0x0000000000CE0000-0x0000000000DEF000-memory.dmp

Filesize
1.1MB

Download