expiro | 2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
23-01-2025 21:55

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General

Target

2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe
Size

1.8MB
MD5

0f22301e83a89910a3d2c266fe7ecf11
SHA1

1b8484962ba986e307bb7f2682ea1b69317c325c
SHA256

2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9
SHA512

a3c304c4acc7f5f9ed80641d90853ce3415d19a21904d3f4c9cf10ecc2a6d315839b54de22605b3adc9be4ec475418d385a2738f9399d4feb113f917ac3ed5b9
SSDEEP

24576:OPgWnc45pqSAasdf3cvlTt2a9P5HU9RlZ+yi8FE:cHncipfA1df3mlT9x0GNEE

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/2280-0-0x0000000001315000-0x00000000013AA000-memory.dmp	family_expiro1
behavioral1/memory/2280-1-0x0000000001140000-0x00000000013AA000-memory.dmp	family_expiro1
behavioral1/memory/2280-2-0x0000000001315000-0x00000000013AA000-memory.dmp	family_expiro1
behavioral1/memory/2280-3-0x0000000001140000-0x00000000013AA000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2900	2280	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	2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 2900	2280	2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe	30
PID 2280 wrote to memory of 2900	2280	2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe	30
PID 2280 wrote to memory of 2900	2280	2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe	30
PID 2280 wrote to memory of 2900	2280	2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe	30

C:\Users\Admin\AppData\Local\Temp\2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe
"C:\Users\Admin\AppData\Local\Temp\2f601617179201c5f7fb91c9f168e5e31ac520466dbe48da5d5e7044992e04b9.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2280
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2280 -s 180
  2⤵
  - Program crash
  PID:2900

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/2280-0-0x0000000001315000-0x00000000013AA000-memory.dmp

Filesize
596KB

Download
memory/2280-1-0x0000000001140000-0x00000000013AA000-memory.dmp

Filesize
2.4MB

Download
memory/2280-2-0x0000000001315000-0x00000000013AA000-memory.dmp

Filesize
596KB

Download
memory/2280-3-0x0000000001140000-0x00000000013AA000-memory.dmp

Filesize
2.4MB

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