expiro | c763b3f029885c6492615bb7655dead9a2333213b997bb4c3e9c02623cae1f54

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
04-01-2025 04:20

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General

Target

JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe
Size

476KB
MD5

77973cf4a64bd05761db62fddedda79f
SHA1

18e8679a577fb83292bc0c4ef4b7ddf04d149a1e
SHA256

c763b3f029885c6492615bb7655dead9a2333213b997bb4c3e9c02623cae1f54
SHA512

eb361ffe4ca25b72e1d1a5f9d479991cce7aca0de501327fc515244e8dbb0ad2e9c2b66942d16d44b57fdc8853f9aa43831188ffa1086397e9523c1f60e37372
SSDEEP

12288:xYmIjE7eNdKcWEbi2Ubr4TgyUbZm6qCs8e/G:L7eNAYbi2Ub8T5geL

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/2096-0-0x0000000000C7B000-0x0000000000D0F000-memory.dmp	family_expiro1
behavioral1/memory/2096-1-0x0000000000C00000-0x0000000000D0F000-memory.dmp	family_expiro1
behavioral1/memory/2096-2-0x0000000000C7B000-0x0000000000D0F000-memory.dmp	family_expiro1
behavioral1/memory/2096-3-0x0000000000C00000-0x0000000000D0F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2384	2096	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_77973cf4a64bd05761db62fddedda79f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2096 wrote to memory of 2384	2096	JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe	32
PID 2096 wrote to memory of 2384	2096	JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe	32
PID 2096 wrote to memory of 2384	2096	JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe	32
PID 2096 wrote to memory of 2384	2096	JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_77973cf4a64bd05761db62fddedda79f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2096
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2096 -s 144
  2⤵
  - Program crash
  PID:2384

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/2096-0-0x0000000000C7B000-0x0000000000D0F000-memory.dmp

Filesize
592KB

Download
memory/2096-1-0x0000000000C00000-0x0000000000D0F000-memory.dmp

Filesize
1.1MB

Download
memory/2096-2-0x0000000000C7B000-0x0000000000D0F000-memory.dmp

Filesize
592KB

Download
memory/2096-3-0x0000000000C00000-0x0000000000D0F000-memory.dmp

Filesize
1.1MB

Download