expiro | e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8

Analysis

max time kernel
122s
max time network
126s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 12:42

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General

Target

JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe
Size

415KB
MD5

a4e5f1e7b92724a85597335c940a8619
SHA1

1eab9b3ef1ddaea70b58186f19ddb085a2b1f44f
SHA256

e6e76e326d39cbe942d69f7d27cfa23355ddeb710a1ab7a29515cf0a001ce1b8
SHA512

2fb1c17603b5d5f192ea7e21e2c796b8f8d2d3b58e7eb91d8b7f2d1d34ec73bb4458acd54254574062cf95bdbc068b2de671993bf2bf45d844c67112fa9fbb60
SSDEEP

6144:nwb1DRS9TABkzG/9caUsOY/S3kz0fRTRLj3WCbFdm71RRynlCRoQxT:wb1NSkkzk9caLVekz0nWG6yoRvx

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/1104-0-0x00000000002EB000-0x000000000037E000-memory.dmp	family_expiro1
behavioral1/memory/1104-1-0x0000000000280000-0x000000000037E000-memory.dmp	family_expiro1
behavioral1/memory/1104-2-0x00000000002EB000-0x000000000037E000-memory.dmp	family_expiro1
behavioral1/memory/1104-3-0x0000000000280000-0x000000000037E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
856	1104	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_a4e5f1e7b92724a85597335c940a8619.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1104 wrote to memory of 856	1104	JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe	32
PID 1104 wrote to memory of 856	1104	JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe	32
PID 1104 wrote to memory of 856	1104	JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe	32
PID 1104 wrote to memory of 856	1104	JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a4e5f1e7b92724a85597335c940a8619.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1104
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1104 -s 64
  2⤵
  - Program crash
  PID:856

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/1104-0-0x00000000002EB000-0x000000000037E000-memory.dmp

Filesize
588KB

Download
memory/1104-1-0x0000000000280000-0x000000000037E000-memory.dmp

Filesize
1016KB

Download
memory/1104-2-0x00000000002EB000-0x000000000037E000-memory.dmp

Filesize
588KB

Download
memory/1104-3-0x0000000000280000-0x000000000037E000-memory.dmp

Filesize
1016KB

Download