expiro | 298c8497eba6cd07c36cbfea2fbe1dddd3d61a154f8320a6ca38a67cf809c4bc

Analysis

max time kernel
15s
max time network
16s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 19:05

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General

Target

JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe
Size

476KB
MD5

b87526e33be6ebc2b745cd32847c0df8
SHA1

4b716d9f157eef9b5bdefeeca6797ab62a3f85ff
SHA256

298c8497eba6cd07c36cbfea2fbe1dddd3d61a154f8320a6ca38a67cf809c4bc
SHA512

e20f0eeae37c67fc617d77b385c9c427558cf9c3904c2991131d3e4a39da42573e57cdb0a2a87062f86b224ee045c350b369db67704b8e97546b3b2252c347b3
SSDEEP

12288:8YmIjE7eNdKcWEb12Ubr4TgyUbZm6qCs8e/G:M7eNAYb12Ub8T5geL

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/2628-0-0x0000000000FBB000-0x000000000104F000-memory.dmp	family_expiro1
behavioral1/memory/2628-1-0x0000000000F40000-0x000000000104F000-memory.dmp	family_expiro1
behavioral1/memory/2628-2-0x0000000000FBB000-0x000000000104F000-memory.dmp	family_expiro1
behavioral1/memory/2628-3-0x0000000000F40000-0x000000000104F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2252	2628	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_b87526e33be6ebc2b745cd32847c0df8.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2628 wrote to memory of 2252	2628	JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe	31
PID 2628 wrote to memory of 2252	2628	JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe	31
PID 2628 wrote to memory of 2252	2628	JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe	31
PID 2628 wrote to memory of 2252	2628	JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b87526e33be6ebc2b745cd32847c0df8.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2628
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2628 -s 144
  2⤵
  - Program crash
  PID:2252

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/2628-0-0x0000000000FBB000-0x000000000104F000-memory.dmp

Filesize
592KB

Download
memory/2628-1-0x0000000000F40000-0x000000000104F000-memory.dmp

Filesize
1.1MB

Download
memory/2628-2-0x0000000000FBB000-0x000000000104F000-memory.dmp

Filesize
592KB

Download
memory/2628-3-0x0000000000F40000-0x000000000104F000-memory.dmp

Filesize
1.1MB

Download