expiro | 20eb6a00ec44a6b6c492cbd62ac2b60b58480290d4ac12f64d4fc957681a09e6

Analysis

max time kernel
118s
max time network
122s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 16:50

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General

Target

JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe
Size

484KB
MD5

b1ea6438defaf9584dc9dc8b5d738152
SHA1

2e2e2307893347702e3618305577454c4c7d8baf
SHA256

20eb6a00ec44a6b6c492cbd62ac2b60b58480290d4ac12f64d4fc957681a09e6
SHA512

a2d40856db1c30de1023034f53ec2130057cf867340848c0e688926cdebba471a100cfd9817d626915ac39335434eba48d960e7b62191dac835bb200871a81cc
SSDEEP

12288:cwV6GFBa6iFBGFSKGXvr/VpprlkOsc8a9I:cwVndFE/hDrlk5fj

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/2824-0-0x0000000000F9D000-0x0000000001030000-memory.dmp	family_expiro1
behavioral1/memory/2824-1-0x0000000000F20000-0x0000000001030000-memory.dmp	family_expiro1
behavioral1/memory/2824-2-0x0000000000F9D000-0x0000000001030000-memory.dmp	family_expiro1
behavioral1/memory/2824-3-0x0000000000F20000-0x0000000001030000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2892	2824	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_b1ea6438defaf9584dc9dc8b5d738152.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2824 wrote to memory of 2892	2824	JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe	30
PID 2824 wrote to memory of 2892	2824	JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe	30
PID 2824 wrote to memory of 2892	2824	JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe	30
PID 2824 wrote to memory of 2892	2824	JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b1ea6438defaf9584dc9dc8b5d738152.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2824
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2824 -s 132
  2⤵
  - Program crash
  PID:2892

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/2824-0-0x0000000000F9D000-0x0000000001030000-memory.dmp

Filesize
588KB

Download
memory/2824-1-0x0000000000F20000-0x0000000001030000-memory.dmp

Filesize
1.1MB

Download
memory/2824-2-0x0000000000F9D000-0x0000000001030000-memory.dmp

Filesize
588KB

Download
memory/2824-3-0x0000000000F20000-0x0000000001030000-memory.dmp

Filesize
1.1MB

Download