expiro | 62239be3e5f6f724045120da571523281f318ab5d28966d6b29169088820f4d1

Analysis

max time kernel
119s
max time network
119s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
06-01-2025 12:26

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General

Target

JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe
Size

692KB
MD5

23808ac746b8f361ae953c13b89e50aa
SHA1

e41c6c8d64a8338f19e3e5c7bddb713acfcc81bd
SHA256

62239be3e5f6f724045120da571523281f318ab5d28966d6b29169088820f4d1
SHA512

f68317f30f95ff5a237f94d712987e5655085e1d3325073f6efb8d100456d5be1b04f2864dde5be82a921305c56deca3712791103d5e91d2d04689becd6a6c8e
SSDEEP

12288:Iw6S8/CwJJDceAsB3l8dBohX5ALKzPSO:Iw6S833QsB3OBohJCKzKO

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 5 IoCs

backdoor

resource	yara_rule
behavioral1/memory/2404-0-0x000000004A7AF000-0x000000004A843000-memory.dmp	family_expiro1
behavioral1/memory/2404-1-0x000000004A700000-0x000000004A843000-memory.dmp	family_expiro1
behavioral1/memory/2404-3-0x000000004A700000-0x000000004A843000-memory.dmp	family_expiro1
behavioral1/memory/2404-4-0x000000004A7AF000-0x000000004A843000-memory.dmp	family_expiro1
behavioral1/memory/2404-5-0x000000004A700000-0x000000004A843000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2364	2404	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_23808ac746b8f361ae953c13b89e50aa.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2404 wrote to memory of 2364	2404	JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe	31
PID 2404 wrote to memory of 2364	2404	JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe	31
PID 2404 wrote to memory of 2364	2404	JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe	31
PID 2404 wrote to memory of 2364	2404	JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_23808ac746b8f361ae953c13b89e50aa.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2404
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2404 -s 152
  2⤵
  - Program crash
  PID:2364

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/2404-0-0x000000004A7AF000-0x000000004A843000-memory.dmp

Filesize
592KB

Download
memory/2404-1-0x000000004A700000-0x000000004A843000-memory.dmp

Filesize
1.3MB

Download
memory/2404-3-0x000000004A700000-0x000000004A843000-memory.dmp

Filesize
1.3MB

Download
memory/2404-4-0x000000004A7AF000-0x000000004A843000-memory.dmp

Filesize
592KB

Download
memory/2404-5-0x000000004A700000-0x000000004A843000-memory.dmp

Filesize
1.3MB

Download