expiro | 46d709bd6c34e85f30439dedbbe2a3cdfd3c06ad0ba7451c3de671070e8943ca

Analysis

max time kernel
122s
max time network
127s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
07-01-2025 07:18

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General

Target

JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe
Size

7.3MB
MD5

551359d718bf4391438edc50d1083a9d
SHA1

b7819404eeb4ae709223005431b364912ab6474f
SHA256

46d709bd6c34e85f30439dedbbe2a3cdfd3c06ad0ba7451c3de671070e8943ca
SHA512

d41de139568d29be828129b35e64de0aab4437cedcb3b53949ebd10f26a9738216ca21c428fbefa077e56a37a1f0c4f2939fbe614335aab2f8f5353305bff341
SSDEEP

98304:3xC3ud6MOIvysiwCQKzo5qphIHVruP3WpF3UdE1hZHEdLFfmil+:8GQFMkhgJuP32+dmhZk/B

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/2092-0-0x000000000187E000-0x0000000001911000-memory.dmp	family_expiro1
behavioral1/memory/2092-1-0x0000000001130000-0x0000000001911000-memory.dmp	family_expiro1
behavioral1/memory/2092-2-0x000000000187E000-0x0000000001911000-memory.dmp	family_expiro1
behavioral1/memory/2092-3-0x0000000001130000-0x0000000001911000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2828	2092	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_551359d718bf4391438edc50d1083a9d.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2092 wrote to memory of 2828	2092	JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe	30
PID 2092 wrote to memory of 2828	2092	JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe	30
PID 2092 wrote to memory of 2828	2092	JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe	30
PID 2092 wrote to memory of 2828	2092	JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_551359d718bf4391438edc50d1083a9d.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2092
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2092 -s 156
  2⤵
  - Program crash
  PID:2828

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/2092-0-0x000000000187E000-0x0000000001911000-memory.dmp

Filesize
588KB

Download
memory/2092-1-0x0000000001130000-0x0000000001911000-memory.dmp

Filesize
7.9MB

Download
memory/2092-2-0x000000000187E000-0x0000000001911000-memory.dmp

Filesize
588KB

Download
memory/2092-3-0x0000000001130000-0x0000000001911000-memory.dmp

Filesize
7.9MB

Download