expiro | 3e381ed697037ae7e121ba6f9cbdea00f0fd7c52858c9a8ba352b91b11a104a0

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10-01-2025 09:20

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General

Target

JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe
Size

417KB
MD5

e096e759ddb39681a6e94008d3c68d6e
SHA1

d3ed082a8d4948c14d4c5960bd6d996991f98918
SHA256

3e381ed697037ae7e121ba6f9cbdea00f0fd7c52858c9a8ba352b91b11a104a0
SHA512

097a7c1c5146564cd15674762e05e1d6c2fdc532664138abafa525f6ee50abf0e4ae1a78226344a78fcc6892946431a7f1e7851b9c247b52227afcc4536bd8fd
SSDEEP

6144:FSpwTEOzPSK5U2SoJ8VWackTV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:k+IK5U2SoyswmwLQcUqgsPBYv745B

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/2280-0-0x00000000012DC000-0x000000000136F000-memory.dmp	family_expiro1
behavioral1/memory/2280-1-0x0000000001270000-0x000000000136F000-memory.dmp	family_expiro1
behavioral1/memory/2280-2-0x00000000012DC000-0x000000000136F000-memory.dmp	family_expiro1
behavioral1/memory/2280-3-0x0000000001270000-0x000000000136F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3020	2280	WerFault.exe	27

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_e096e759ddb39681a6e94008d3c68d6e.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 3020	2280	JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe	28
PID 2280 wrote to memory of 3020	2280	JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe	28
PID 2280 wrote to memory of 3020	2280	JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe	28
PID 2280 wrote to memory of 3020	2280	JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe	28

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_e096e759ddb39681a6e94008d3c68d6e.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2280
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2280 -s 68
  2⤵
  - Program crash
  PID:3020

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/2280-0-0x00000000012DC000-0x000000000136F000-memory.dmp

Filesize
588KB

Download
memory/2280-1-0x0000000001270000-0x000000000136F000-memory.dmp

Filesize
1020KB

Download
memory/2280-2-0x00000000012DC000-0x000000000136F000-memory.dmp

Filesize
588KB

Download
memory/2280-3-0x0000000001270000-0x000000000136F000-memory.dmp

Filesize
1020KB

Download