expiro | 4ff161385d98342b9bb23c075c59a43d40605fba3048b66cb368b8b4a7b17769

Analysis

max time kernel
14s
max time network
18s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
03/01/2025, 02:50

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General

Target

JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe
Size

768KB
MD5

69c7ad2356804730f52e986ee29c54a0
SHA1

33629b933354c2eacaa9a64d8367a0d0fd6eafdb
SHA256

4ff161385d98342b9bb23c075c59a43d40605fba3048b66cb368b8b4a7b17769
SHA512

d80e668953ba6d5d35a7b3ff47eb08254bf6968a6350207a948d8a6e1365b9da949773f751a482647c114ba581f573b3bd65bd1b60336c613e21a1f242697681
SSDEEP

12288:VKPaGOUvDGBmEnO7D9JcmrZS5f73+TZuZ7SN8UgSucVusyi9alrcI3u:IPaGKBVO7DP7873iZuYaWucEsJEcI

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 1 IoCs

backdoor

resource	yara_rule
behavioral1/memory/2568-2-0x0000000000400000-0x0000000000682000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2204	2568	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_69c7ad2356804730f52e986ee29c54a0.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2568 wrote to memory of 2204	2568	JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe	30
PID 2568 wrote to memory of 2204	2568	JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe	30
PID 2568 wrote to memory of 2204	2568	JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe	30
PID 2568 wrote to memory of 2204	2568	JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_69c7ad2356804730f52e986ee29c54a0.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2568
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2568 -s 128
  2⤵
  - Program crash
  PID:2204

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/2568-0-0x0000000000400000-0x0000000000682000-memory.dmp

Filesize
2.5MB

Download
memory/2568-1-0x0000000000401000-0x0000000000402000-memory.dmp

Filesize
4KB

Download
memory/2568-2-0x0000000000400000-0x0000000000682000-memory.dmp

Filesize
2.5MB

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