expiro | fcc6f76b1143a656ac5c0cda561bdc3f2175a8699cf791a5ff5d74bd28cbf632

Analysis

max time kernel
117s
max time network
117s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10/01/2025, 11:34

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General

Target

JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe
Size

417KB
MD5

e3353980b770e7d6c5f7172a138fd8e9
SHA1

8fc30ebcd63747a434c38a707372565468ce646e
SHA256

fcc6f76b1143a656ac5c0cda561bdc3f2175a8699cf791a5ff5d74bd28cbf632
SHA512

63df7e3e3becdb58c4fa4bb1402b8461dfa406daaa45d815e0e156b7c5c59029f13bfb974f2db39f70e2a80260627cbd4d9a55c9771c6c06f9ecb19a98c0d11d
SSDEEP

6144:QSpwTEOzPSK5U2SoJ8VWackmV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:v+IK5U2SoystmwLQcUqgsPBYv745B

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/2688-0-0x000000000124C000-0x00000000012DF000-memory.dmp	family_expiro1
behavioral1/memory/2688-1-0x00000000011E0000-0x00000000012DF000-memory.dmp	family_expiro1
behavioral1/memory/2688-2-0x000000000124C000-0x00000000012DF000-memory.dmp	family_expiro1
behavioral1/memory/2688-3-0x00000000011E0000-0x00000000012DF000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3004	2688	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_e3353980b770e7d6c5f7172a138fd8e9.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2688 wrote to memory of 3004	2688	JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe	30
PID 2688 wrote to memory of 3004	2688	JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe	30
PID 2688 wrote to memory of 3004	2688	JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe	30
PID 2688 wrote to memory of 3004	2688	JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_e3353980b770e7d6c5f7172a138fd8e9.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2688
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2688 -s 68
  2⤵
  - Program crash
  PID:3004

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/2688-0-0x000000000124C000-0x00000000012DF000-memory.dmp

Filesize
588KB

Download
memory/2688-1-0x00000000011E0000-0x00000000012DF000-memory.dmp

Filesize
1020KB

Download
memory/2688-2-0x000000000124C000-0x00000000012DF000-memory.dmp

Filesize
588KB

Download
memory/2688-3-0x00000000011E0000-0x00000000012DF000-memory.dmp

Filesize
1020KB

Download