expiro | 87d44ff5c5288094440d7fcc2c365c03a744cc0905fc7827212ecd3e9ff16410

Analysis

max time kernel
120s
max time network
125s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
09/01/2025, 20:31

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target

JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe
Size

815KB
MD5

d1b2589806423f4f2d9156a95f15d4dc
SHA1

2978e197a35a7e6647aed51fc4a706baf8012002
SHA256

87d44ff5c5288094440d7fcc2c365c03a744cc0905fc7827212ecd3e9ff16410
SHA512

dbb8f2eebc9cfb50582b4586ef99ebf6a45f615c5a70b7eea173a6c57e839f54a012b984a89928456231bea6474925ae608affaed7c4d730a5dee4b6c17a5a19
SSDEEP

12288:ZFfiAAEJh8KrH/VvGdQDegicC17D5A+RHeSiqLSarxtyZl:riAxUKrH/pGOegoR5iqGHZ

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/2324-0-0x0000000000DDD000-0x0000000000E71000-memory.dmp	family_expiro1
behavioral1/memory/2324-1-0x0000000000D10000-0x0000000000E71000-memory.dmp	family_expiro1
behavioral1/memory/2324-2-0x0000000000DDD000-0x0000000000E71000-memory.dmp	family_expiro1
behavioral1/memory/2324-3-0x0000000000D10000-0x0000000000E71000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2604	2324	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_d1b2589806423f4f2d9156a95f15d4dc.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 2604	2324	JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe	30
PID 2324 wrote to memory of 2604	2324	JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe	30
PID 2324 wrote to memory of 2604	2324	JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe	30
PID 2324 wrote to memory of 2604	2324	JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d1b2589806423f4f2d9156a95f15d4dc.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2324
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2324 -s 172
  2⤵
  - Program crash
  PID:2604

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

Loading Replay Monitor...

Downloads

memory/2324-0-0x0000000000DDD000-0x0000000000E71000-memory.dmp

Filesize
592KB

Download
memory/2324-1-0x0000000000D10000-0x0000000000E71000-memory.dmp

Filesize
1.4MB

Download
memory/2324-2-0x0000000000DDD000-0x0000000000E71000-memory.dmp

Filesize
592KB

Download
memory/2324-3-0x0000000000D10000-0x0000000000E71000-memory.dmp

Filesize
1.4MB

Download