expiro | 611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024e

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
04-01-2025 12:00

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General

Target

611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe
Size

567KB
MD5

03bef5716ae5e65a8fe44d9efb8057b0
SHA1

3bf498317057b0f03f78b23f0c10737257763662
SHA256

611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024e
SHA512

da5070cfef33aabc374767c36dbd2b1cd8ad4d50d6658a494835f3aab1a05915233688c1f4d5173f380b592ae165fa4ccfc891941dcbcbed35dabcee15372919
SSDEEP

12288:EbhlwU8USMb7j1kBm3LQFtDKHl9MlcREd0E5MKuto5S15PLJikYN8f:O8IRSE6tDKlEd0E5xIoS15PLLk

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 2 IoCs

backdoor

resource	yara_rule
behavioral1/memory/1620-0-0x0000000000400000-0x000000000064F000-memory.dmp	family_expiro1
behavioral1/memory/1620-2-0x0000000000400000-0x000000000064F000-memory.dmp	family_expiro1

System Location Discovery: System Language Discovery 1 TTPs 2 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	611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1620 wrote to memory of 2312	1620	611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe	30
PID 1620 wrote to memory of 2312	1620	611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe	30
PID 1620 wrote to memory of 2312	1620	611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe	30
PID 1620 wrote to memory of 2312	1620	611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe	30

C:\Users\Admin\AppData\Local\Temp\611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe
"C:\Users\Admin\AppData\Local\Temp\611ccdfec5648b5b5efec7d58ee7d3386a33d2d31567e40f8e71c16d1b3e024eN.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1620
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\SysWOW64\schtasks.exe" /Delete /TN EPUpdater /F
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2312

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/1620-0-0x0000000000400000-0x000000000064F000-memory.dmp

Filesize
2.3MB

Download
memory/1620-1-0x0000000000401000-0x0000000000402000-memory.dmp

Filesize
4KB

Download
memory/1620-2-0x0000000000400000-0x000000000064F000-memory.dmp

Filesize
2.3MB

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