expiro | 79f340dfdc257db9a48bbea61c4ab902887e86a4889e4ea2cc4ca7ae46883afd

Analysis

max time kernel
94s
max time network
131s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2024 10:07

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General

Target

JaffaCakes118_139335a6096389351c49b2030491526b.exe
Size

417KB
MD5

139335a6096389351c49b2030491526b
SHA1

ae0d492d54b13d2ac651afec17b7745e2e0f45d4
SHA256

79f340dfdc257db9a48bbea61c4ab902887e86a4889e4ea2cc4ca7ae46883afd
SHA512

4e96595315664afbb0acdede5d3b3355f5008bdd49bf707a40064a76607608a0c081ac3df0649cf1a2286ca2ee8e33ea9ebec2d3ae570b4dacec0c6aebef3adb
SSDEEP

6144:dSpwTEOzPSK5U2SoJ8VWackZV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:8+IK5U2SoysimwLQcUqgsPBYv745B

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
behavioral2/memory/4576-0-0x000000000028C000-0x000000000031F000-memory.dmp	family_expiro1
behavioral2/memory/4576-1-0x0000000000220000-0x000000000031F000-memory.dmp	family_expiro1
behavioral2/memory/4576-2-0x000000000028C000-0x000000000031F000-memory.dmp	family_expiro1
behavioral2/memory/4576-3-0x0000000000220000-0x000000000031F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3508	4576	WerFault.exe	81

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_139335a6096389351c49b2030491526b.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_139335a6096389351c49b2030491526b.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_139335a6096389351c49b2030491526b.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4576
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4576 -s 256
  2⤵
  - Program crash
  PID:3508

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 376 -p 4576 -ip 4576
1⤵
PID:4228

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/4576-0-0x000000000028C000-0x000000000031F000-memory.dmp

Filesize
588KB

Download
memory/4576-1-0x0000000000220000-0x000000000031F000-memory.dmp

Filesize
1020KB

Download
memory/4576-2-0x000000000028C000-0x000000000031F000-memory.dmp

Filesize
588KB

Download
memory/4576-3-0x0000000000220000-0x000000000031F000-memory.dmp

Filesize
1020KB

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