expiro | 68fe4ddf68cd32aa835a4fe1efd4972f6e76be61e50f44aafc7ec8f33e612553

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
31-12-2024 14:33

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General

Target

JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe
Size

535KB
MD5

21f6f27f483c56fcab2908422fcb3ee1
SHA1

cbfc47612d1ffc4b18fef0da883d0d43b9126b73
SHA256

68fe4ddf68cd32aa835a4fe1efd4972f6e76be61e50f44aafc7ec8f33e612553
SHA512

f0bec4c5d8ef6585a33e0d38a4ff75c757a9023fdb2790db363cc016b81784d1f00cf7562039d17ba6c9d546bf7d5ebe97f38ff8e5b8d6f8c9f16372afc77770
SSDEEP

12288:5gbi9I6oqJVNWnwHNneDWcLo7qHY8JgO2:DI3KVLNneacUuHZgO2

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/1996-0-0x000000000114B000-0x00000000011DE000-memory.dmp	family_expiro1
behavioral1/memory/1996-1-0x00000000010C0000-0x00000000011DE000-memory.dmp	family_expiro1
behavioral1/memory/1996-2-0x000000000114B000-0x00000000011DE000-memory.dmp	family_expiro1
behavioral1/memory/1996-3-0x00000000010C0000-0x00000000011DE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
584	1996	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_21f6f27f483c56fcab2908422fcb3ee1.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1996 wrote to memory of 584	1996	JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe	30
PID 1996 wrote to memory of 584	1996	JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe	30
PID 1996 wrote to memory of 584	1996	JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe	30
PID 1996 wrote to memory of 584	1996	JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_21f6f27f483c56fcab2908422fcb3ee1.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1996
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1996 -s 88
  2⤵
  - Program crash
  PID:584

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/1996-0-0x000000000114B000-0x00000000011DE000-memory.dmp

Filesize
588KB

Download
memory/1996-1-0x00000000010C0000-0x00000000011DE000-memory.dmp

Filesize
1.1MB

Download
memory/1996-2-0x000000000114B000-0x00000000011DE000-memory.dmp

Filesize
588KB

Download
memory/1996-3-0x00000000010C0000-0x00000000011DE000-memory.dmp

Filesize
1.1MB

Download