expiro | 21e3c976a72b6f25b7c90ad8350661e86adac58dc01d15ceed985e9c9f118063

Analysis

max time kernel
120s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
31-12-2024 08:10

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General

Target

JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe
Size

417KB
MD5

0d165a05ca7ff896eabcd032ada365b4
SHA1

22ada9a59d7a987a980e2e667266ddd405e29298
SHA256

21e3c976a72b6f25b7c90ad8350661e86adac58dc01d15ceed985e9c9f118063
SHA512

5cc651ec9784fcb0d1cc49e4ced91d6050e55b20434470da1665e65bc081074ace462bb457d658217f616b9e18c3c50a12cb3b04dfd91559adc1a6e88e0c09a7
SSDEEP

6144:TSpwTEOzPSK5U2SoJ8VWackcV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:u+IK5U2SoysHmwLQcUqgsPBYv745B

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/2236-0-0x000000000118C000-0x000000000121F000-memory.dmp	family_expiro1
behavioral1/memory/2236-1-0x0000000001120000-0x000000000121F000-memory.dmp	family_expiro1
behavioral1/memory/2236-2-0x000000000118C000-0x000000000121F000-memory.dmp	family_expiro1
behavioral1/memory/2236-3-0x0000000001120000-0x000000000121F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2556	2236	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_0d165a05ca7ff896eabcd032ada365b4.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 2556	2236	JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe	30
PID 2236 wrote to memory of 2556	2236	JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe	30
PID 2236 wrote to memory of 2556	2236	JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe	30
PID 2236 wrote to memory of 2556	2236	JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0d165a05ca7ff896eabcd032ada365b4.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2236
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2236 -s 68
  2⤵
  - Program crash
  PID:2556

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/2236-0-0x000000000118C000-0x000000000121F000-memory.dmp

Filesize
588KB

Download
memory/2236-1-0x0000000001120000-0x000000000121F000-memory.dmp

Filesize
1020KB

Download
memory/2236-2-0x000000000118C000-0x000000000121F000-memory.dmp

Filesize
588KB

Download
memory/2236-3-0x0000000001120000-0x000000000121F000-memory.dmp

Filesize
1020KB

Download