expiro | ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c

Analysis

max time kernel
118s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 04:26

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General

Target

JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe
Size

415KB
MD5

8b6c68e136bc1e084adc817668558bf2
SHA1

4819547f22c885e42ef398e06766581a954157cf
SHA256

ba075c02a061c96f5604e801215db9118a51a81ab8460c75d73ceac99408786c
SHA512

225b94758488938752228156e894bf9c4184be44efe5029884633ab5258acbe3c8c7a7f16f219f425ee0d1b326757c98b796310b492f4f62dfc95192ad37714d
SSDEEP

12288:mf5auspr1fNtSMT0tSSOw10VLhIYF8RThd:mfBsptSMTKKw0a7d

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/2492-0-0x000000000044B000-0x00000000004DE000-memory.dmp	family_expiro1
behavioral1/memory/2492-1-0x00000000003E0000-0x00000000004DE000-memory.dmp	family_expiro1
behavioral1/memory/2492-2-0x000000000044B000-0x00000000004DE000-memory.dmp	family_expiro1
behavioral1/memory/2492-3-0x00000000003E0000-0x00000000004DE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1800	2492	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_8b6c68e136bc1e084adc817668558bf2.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2492 wrote to memory of 1800	2492	JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe	31
PID 2492 wrote to memory of 1800	2492	JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe	31
PID 2492 wrote to memory of 1800	2492	JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe	31
PID 2492 wrote to memory of 1800	2492	JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8b6c68e136bc1e084adc817668558bf2.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2492
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2492 -s 64
  2⤵
  - Program crash
  PID:1800

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/2492-0-0x000000000044B000-0x00000000004DE000-memory.dmp

Filesize
588KB

Download
memory/2492-1-0x00000000003E0000-0x00000000004DE000-memory.dmp

Filesize
1016KB

Download
memory/2492-2-0x000000000044B000-0x00000000004DE000-memory.dmp

Filesize
588KB

Download
memory/2492-3-0x00000000003E0000-0x00000000004DE000-memory.dmp

Filesize
1016KB

Download