expiro | 55747585ad8f1ed74c2b5f0ab50352dea32bfef2ee7282961888a31d8ba6dc27

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20250207-en
resource tags

arch:x64arch:x86image:win10v2004-20250207-enlocale:en-usos:windows10-2004-x64system
submitted
08-02-2025 14:30

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General

Target

55747585ad8f1ed74c2b5f0ab50352dea32bfef2ee7282961888a31d8ba6dc27.exe
Size

1.9MB
MD5

b6e038eb7dbbe7f583d5e9d473c1c540
SHA1

0b474b49114620ce5475de4174bab7e8b0e83186
SHA256

55747585ad8f1ed74c2b5f0ab50352dea32bfef2ee7282961888a31d8ba6dc27
SHA512

d678e8a038039f393a6834c5e45a7035bcfce1affef26a5baa334a51cb9d3d4a2e5678d2e17ffce026ae896c050d844c6688803df1e26d903d48e1e0bb21b503
SSDEEP

49152:Uy6qY5DKxS9solEvv2l9/G7i6Ifu4xuaRPGb+Z3:UyxJq/t6IfuERPAE

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
behavioral2/memory/4244-0-0x0000000000974000-0x0000000000A08000-memory.dmp	family_expiro1
behavioral2/memory/4244-1-0x0000000000790000-0x0000000000A08000-memory.dmp	family_expiro1
behavioral2/memory/4244-3-0x0000000000790000-0x0000000000A08000-memory.dmp	family_expiro1
behavioral2/memory/4244-2-0x0000000000974000-0x0000000000A08000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3200	4244	WerFault.exe	85

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	55747585ad8f1ed74c2b5f0ab50352dea32bfef2ee7282961888a31d8ba6dc27.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2440	MicrosoftEdgeUpdate.exe

C:\Users\Admin\AppData\Local\Temp\55747585ad8f1ed74c2b5f0ab50352dea32bfef2ee7282961888a31d8ba6dc27.exe
"C:\Users\Admin\AppData\Local\Temp\55747585ad8f1ed74c2b5f0ab50352dea32bfef2ee7282961888a31d8ba6dc27.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4244
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4244 -s 568
  2⤵
  - Program crash
  PID:3200

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 356 -p 4244 -ip 4244
1⤵
PID:1980

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDcxNzgiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxOTY4MDM3MTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0OTk1MTIxNzg5Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:2440

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

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/4244-0-0x0000000000974000-0x0000000000A08000-memory.dmp

Filesize
592KB

Download
memory/4244-1-0x0000000000790000-0x0000000000A08000-memory.dmp

Filesize
2.5MB

Download
memory/4244-3-0x0000000000790000-0x0000000000A08000-memory.dmp

Filesize
2.5MB

Download
memory/4244-2-0x0000000000974000-0x0000000000A08000-memory.dmp

Filesize
592KB

Download