expiro | a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e

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
05-01-2025 13:17

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General

Target

JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe
Size

7.3MB
MD5

a6b8db8215b183a84d56e2c0e76147fa
SHA1

e6dcc80893afdc173ebaba8061543d0986e7ad80
SHA256

a225275b37dc396bd2619a87ff2b16ebb2d82ca201d8fa2f446696fcf453403e
SHA512

e4ff9c34769468a08088cfabb1941928727f17d8de6f7f96b9d20b7b5d90a32fe8d4308b8b3cb5f2d8cde7d4c2942ce1dd32527a9ec6008f33906e587f9d9bba
SSDEEP

98304:3xC3ud6MOIvysi7CQKzo5qphIHVruP3WpF3UdE1hZHEdLF00X:8GQgMkhgJuP32+dmhZk/0k

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/1656-0-0x0000000000A4E000-0x0000000000AE1000-memory.dmp	family_expiro1
behavioral1/memory/1656-1-0x0000000000300000-0x0000000000AE1000-memory.dmp	family_expiro1
behavioral1/memory/1656-2-0x0000000000A4E000-0x0000000000AE1000-memory.dmp	family_expiro1
behavioral1/memory/1656-3-0x0000000000300000-0x0000000000AE1000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2856	1656	WerFault.exe	27

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_a6b8db8215b183a84d56e2c0e76147fa.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1656 wrote to memory of 2856	1656	JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe	28
PID 1656 wrote to memory of 2856	1656	JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe	28
PID 1656 wrote to memory of 2856	1656	JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe	28
PID 1656 wrote to memory of 2856	1656	JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe	28

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a6b8db8215b183a84d56e2c0e76147fa.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1656
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1656 -s 156
  2⤵
  - Program crash
  PID:2856

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

Replay Monitor

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Downloads

memory/1656-0-0x0000000000A4E000-0x0000000000AE1000-memory.dmp

Filesize
588KB

Download
memory/1656-1-0x0000000000300000-0x0000000000AE1000-memory.dmp

Filesize
7.9MB

Download
memory/1656-2-0x0000000000A4E000-0x0000000000AE1000-memory.dmp

Filesize
588KB

Download
memory/1656-3-0x0000000000300000-0x0000000000AE1000-memory.dmp

Filesize
7.9MB

Download