expiro | c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31

Analysis

max time kernel
13s
max time network
19s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 15:53

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General

Target

c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe
Size

1.7MB
MD5

f03ed830fb1b9946380b3806db0bf77d
SHA1

eaeb32a8f403f165bea4f97e2449db76d65900b6
SHA256

c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31
SHA512

135eef5203f128058999d67cbf75e8a134bb497e739e64bead3f01ad85202815335e3267fbf796b71f54bb397eb24340af7067ede7f564e47b93321f922a1192
SSDEEP

49152:PK9QYfDPJZr9ra11M+jtIbCRLlv7p0tdZwAweQsqn6:PK9Q0DPpIxkCvV0tM9eQsq

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/2100-0-0x0000000000CD0000-0x0000000000D00000-memory.dmp	family_expiro1
behavioral1/memory/2100-1-0x0000000000B20000-0x0000000000D00000-memory.dmp	family_expiro1
behavioral1/memory/2100-2-0x0000000000B20000-0x0000000000D00000-memory.dmp	family_expiro1
behavioral1/memory/2100-3-0x0000000000CD0000-0x0000000000D00000-memory.dmp	family_expiro1
behavioral1/memory/2100-4-0x0000000000B20000-0x0000000000D00000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
912	2100	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	c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2100 wrote to memory of 912	2100	c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe	30
PID 2100 wrote to memory of 912	2100	c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe	30
PID 2100 wrote to memory of 912	2100	c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe	30
PID 2100 wrote to memory of 912	2100	c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe	30

C:\Users\Admin\AppData\Local\Temp\c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe
"C:\Users\Admin\AppData\Local\Temp\c72f52d9624f9b8199165efdf861062ecb74b0cab19006dfc4307d349bb45e31.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2100
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2100 -s 156
  2⤵
  - Program crash
  PID:912

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/2100-0-0x0000000000CD0000-0x0000000000D00000-memory.dmp

Filesize
192KB

Download
memory/2100-1-0x0000000000B20000-0x0000000000D00000-memory.dmp

Filesize
1.9MB

Download
memory/2100-2-0x0000000000B20000-0x0000000000D00000-memory.dmp

Filesize
1.9MB

Download
memory/2100-3-0x0000000000CD0000-0x0000000000D00000-memory.dmp

Filesize
192KB

Download
memory/2100-4-0x0000000000B20000-0x0000000000D00000-memory.dmp

Filesize
1.9MB

Download