expiro | 4317afbf25f7145ec2e84eee745d09c9f6e8a0973a460892fc4fa76595bfa319

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
10-01-2025 10:13

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General

Target

JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe
Size

7.3MB
MD5

e1a7b4cbe8e8aabce05747a34ce3a875
SHA1

f31a6ca925f4a040bc29982ffb1cf6f0bc8b0843
SHA256

4317afbf25f7145ec2e84eee745d09c9f6e8a0973a460892fc4fa76595bfa319
SHA512

5db4ecec060dd771b77825106a554a7e91abc4da3431cff39fb4096ddad2309a230d28bf26777cb20d990678f7c21784aa00135057130517998488d9c79e520d
SSDEEP

98304:dxC3ud6MOIvysi7CQKzo5qphIHVruP3WpF3UdE1hZHEdLF00n:SGQgMkhgJuP32+dmhZk/08

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/2504-0-0x00000000008DE000-0x0000000000971000-memory.dmp	family_expiro1
behavioral1/memory/2504-1-0x0000000000190000-0x0000000000971000-memory.dmp	family_expiro1
behavioral1/memory/2504-2-0x00000000008DE000-0x0000000000971000-memory.dmp	family_expiro1
behavioral1/memory/2504-3-0x0000000000190000-0x0000000000971000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1944	2504	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_e1a7b4cbe8e8aabce05747a34ce3a875.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2504 wrote to memory of 1944	2504	JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe	30
PID 2504 wrote to memory of 1944	2504	JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe	30
PID 2504 wrote to memory of 1944	2504	JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe	30
PID 2504 wrote to memory of 1944	2504	JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_e1a7b4cbe8e8aabce05747a34ce3a875.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2504
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2504 -s 156
  2⤵
  - Program crash
  PID:1944

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/2504-0-0x00000000008DE000-0x0000000000971000-memory.dmp

Filesize
588KB

Download
memory/2504-1-0x0000000000190000-0x0000000000971000-memory.dmp

Filesize
7.9MB

Download
memory/2504-2-0x00000000008DE000-0x0000000000971000-memory.dmp

Filesize
588KB

Download
memory/2504-3-0x0000000000190000-0x0000000000971000-memory.dmp

Filesize
7.9MB

Download