expiro | 4f098737a0b13e9129123e1fa03e34a8473421fe818282fe8e58ca6749dce747

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
10/01/2025, 18:21

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General

Target

JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe
Size

484KB
MD5

eae9019d1976bfa42ce219392a42e98b
SHA1

35eba58c2422aa11b5d4554c824ca92947f8f950
SHA256

4f098737a0b13e9129123e1fa03e34a8473421fe818282fe8e58ca6749dce747
SHA512

aac6d4a587465dbc88f424f4846f38b0e7e7212effa5634f43c542ee9bf2892a6f791139db5071dfaf76964934a380cbcd0d613c9a0c81827fdd3be02f1daab2
SSDEEP

6144:p2V8qKt/zG0/E3bg3mh9QPghD4fyR9ZIyUc5CokFiokBwVpvh9BBXRCl:p2V6GFGmIYSq5RD5CoF+vG

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/2092-0-0x000000000034D000-0x00000000003E0000-memory.dmp	family_expiro1
behavioral1/memory/2092-1-0x00000000002D0000-0x00000000003E0000-memory.dmp	family_expiro1
behavioral1/memory/2092-2-0x000000000034D000-0x00000000003E0000-memory.dmp	family_expiro1
behavioral1/memory/2092-3-0x00000000002D0000-0x00000000003E0000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2056	2092	WerFault.exe	30

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_eae9019d1976bfa42ce219392a42e98b.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2092 wrote to memory of 2056	2092	JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe	31
PID 2092 wrote to memory of 2056	2092	JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe	31
PID 2092 wrote to memory of 2056	2092	JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe	31
PID 2092 wrote to memory of 2056	2092	JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_eae9019d1976bfa42ce219392a42e98b.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2092
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2092 -s 132
  2⤵
  - Program crash
  PID:2056

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/2092-0-0x000000000034D000-0x00000000003E0000-memory.dmp

Filesize
588KB

Download
memory/2092-1-0x00000000002D0000-0x00000000003E0000-memory.dmp

Filesize
1.1MB

Download
memory/2092-2-0x000000000034D000-0x00000000003E0000-memory.dmp

Filesize
588KB

Download
memory/2092-3-0x00000000002D0000-0x00000000003E0000-memory.dmp

Filesize
1.1MB

Download