expiro | 1f72b2f392c4e8d0cd7a0638ca92e5ec483c369bd92669392aba4425cf0d3599

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
01-01-2025 00:17

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General

Target

JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe
Size

437KB
MD5

4077705b993f00d36b1d13d4b9a87390
SHA1

be3a462ab6d6ef970015c3e30384079503ee4cd7
SHA256

1f72b2f392c4e8d0cd7a0638ca92e5ec483c369bd92669392aba4425cf0d3599
SHA512

fb3eff74ad3593dcc4ca11de2e4d1454d963b8dc4cad9e53aa1161c8125a328380ccce08f21123789bb0b111121b5ca9cea8890f9b51a6f4beb22ae2e685c9a6
SSDEEP

6144:U0Vwm2i+mKaN68U8Wdvym8fXZkJ/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:Ari+m/A4Wx3U0/LzARMVO4sNyDm3F3U

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/1988-0-0x00000000000F0000-0x0000000000184000-memory.dmp	family_expiro1
behavioral1/memory/1988-1-0x0000000000080000-0x0000000000184000-memory.dmp	family_expiro1
behavioral1/memory/1988-2-0x00000000000F0000-0x0000000000184000-memory.dmp	family_expiro1
behavioral1/memory/1988-3-0x0000000000080000-0x0000000000184000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2508	1988	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	JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1988 wrote to memory of 2508	1988	JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe	30
PID 1988 wrote to memory of 2508	1988	JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe	30
PID 1988 wrote to memory of 2508	1988	JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe	30
PID 1988 wrote to memory of 2508	1988	JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4077705b993f00d36b1d13d4b9a87390.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1988
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1988 -s 160
  2⤵
  - Program crash
  PID:2508

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/1988-0-0x00000000000F0000-0x0000000000184000-memory.dmp

Filesize
592KB

Download
memory/1988-1-0x0000000000080000-0x0000000000184000-memory.dmp

Filesize
1.0MB

Download
memory/1988-2-0x00000000000F0000-0x0000000000184000-memory.dmp

Filesize
592KB

Download
memory/1988-3-0x0000000000080000-0x0000000000184000-memory.dmp

Filesize
1.0MB

Download