expiro | f715fdaaf61ceb671867edd9d32dce892e5e9783fcfd98715a991d13b36c9175

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08/01/2025, 09:27

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General

Target

JaffaCakes118_985fa57a40a99c9d52961b71dd5e715c.exe
Size

415KB
MD5

985fa57a40a99c9d52961b71dd5e715c
SHA1

1b6e9c3363a66c6f2648b06fc937b911bfc8bad7
SHA256

f715fdaaf61ceb671867edd9d32dce892e5e9783fcfd98715a991d13b36c9175
SHA512

5105deba20c2c1364a5d84c6d28aba6526629b2e6b68897a23142155ddae300fbb9026abbce522bcd0c2f72f1e4c413583c0ae1cac07b20d2ea717ca775d6bec
SSDEEP

6144:xHGVlVgtTX9B+CL+r6mhKF7DtJORQ83XpJ9eNWKzn2+hlTjJEUn:0RETX9B+C6r6vX8H57GhnrzX3

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/4768-0-0x000000000059B000-0x000000000062E000-memory.dmp	family_expiro1
behavioral2/memory/4768-1-0x0000000000530000-0x000000000062E000-memory.dmp	family_expiro1
behavioral2/memory/4768-2-0x000000000059B000-0x000000000062E000-memory.dmp	family_expiro1
behavioral2/memory/4768-3-0x0000000000530000-0x000000000062E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3312	4768	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_985fa57a40a99c9d52961b71dd5e715c.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_985fa57a40a99c9d52961b71dd5e715c.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_985fa57a40a99c9d52961b71dd5e715c.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4768
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4768 -s 260
  2⤵
  - Program crash
  PID:3312

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4768 -ip 4768
1⤵
PID:3408

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/4768-0-0x000000000059B000-0x000000000062E000-memory.dmp

Filesize
588KB

Download
memory/4768-1-0x0000000000530000-0x000000000062E000-memory.dmp

Filesize
1016KB

Download
memory/4768-2-0x000000000059B000-0x000000000062E000-memory.dmp

Filesize
588KB

Download
memory/4768-3-0x0000000000530000-0x000000000062E000-memory.dmp

Filesize
1016KB

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