expiro | b1cbe50c00ba8c397d2eabe9d0c2ebc9fc175455f9a6c9ea0b481f79ff7cab8f

Analysis

max time kernel
119s
max time network
119s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 10:46

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General

Target

JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe
Size

437KB
MD5

9eab5d6f597d5f8492f737140b536bf7
SHA1

dc32cbccab029046c27f4a43be802b9f37fe932e
SHA256

b1cbe50c00ba8c397d2eabe9d0c2ebc9fc175455f9a6c9ea0b481f79ff7cab8f
SHA512

7cee1ce8079f40c1804d3b553b4859b8ab1c6f700b4f637cd72c6702aaa19fe5e64b71f1048faa6a1246892cef482dc46bd6fef0b4b76433b75c31c33a7116d2
SSDEEP

6144:UJVwm2i+mKaN68U8Wdvym8fXZkP/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:rri+m/A4Wx3UG/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/2700-0-0x0000000001120000-0x00000000011B4000-memory.dmp	family_expiro1
behavioral1/memory/2700-1-0x00000000010B0000-0x00000000011B4000-memory.dmp	family_expiro1
behavioral1/memory/2700-2-0x0000000001120000-0x00000000011B4000-memory.dmp	family_expiro1
behavioral1/memory/2700-3-0x00000000010B0000-0x00000000011B4000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2776	2700	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_9eab5d6f597d5f8492f737140b536bf7.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2700 wrote to memory of 2776	2700	JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe	30
PID 2700 wrote to memory of 2776	2700	JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe	30
PID 2700 wrote to memory of 2776	2700	JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe	30
PID 2700 wrote to memory of 2776	2700	JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9eab5d6f597d5f8492f737140b536bf7.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2700
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2700 -s 160
  2⤵
  - Program crash
  PID:2776

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/2700-0-0x0000000001120000-0x00000000011B4000-memory.dmp

Filesize
592KB

Download
memory/2700-1-0x00000000010B0000-0x00000000011B4000-memory.dmp

Filesize
1.0MB

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memory/2700-2-0x0000000001120000-0x00000000011B4000-memory.dmp

Filesize
592KB

Download
memory/2700-3-0x00000000010B0000-0x00000000011B4000-memory.dmp

Filesize
1.0MB

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