expiro | c3eade55771f4706511e5a1df6ce6de631c60fefca64d91df89ed0e113c67b8b

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08-01-2025 19:25

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General

Target

JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe
Size

7.3MB
MD5

a7b09cadb6042edd65fc1a78aa8375e9
SHA1

0c05f039de96804bd9b4c944fe47d1588f7ffed4
SHA256

c3eade55771f4706511e5a1df6ce6de631c60fefca64d91df89ed0e113c67b8b
SHA512

ab6325a5e627b05f399e0234915d835edfded9ec829fc21e77f231de0d9ff8a91eeedf16020b6418bac6146cb24a902faf93fa09ac2b8cfd7d39db5c03f874ca
SSDEEP

98304:ixC3ud6MOIvysi7CQKzo5qphIHVruP3WpF3UdE1hZHEdLF00k:FGQgMkhgJuP32+dmhZk/0n

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/1276-0-0x0000000000FFE000-0x0000000001091000-memory.dmp	family_expiro1
behavioral1/memory/1276-1-0x00000000008B0000-0x0000000001091000-memory.dmp	family_expiro1
behavioral1/memory/1276-2-0x0000000000FFE000-0x0000000001091000-memory.dmp	family_expiro1
behavioral1/memory/1276-3-0x00000000008B0000-0x0000000001091000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2372	1276	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_a7b09cadb6042edd65fc1a78aa8375e9.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1276 wrote to memory of 2372	1276	JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe	30
PID 1276 wrote to memory of 2372	1276	JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe	30
PID 1276 wrote to memory of 2372	1276	JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe	30
PID 1276 wrote to memory of 2372	1276	JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a7b09cadb6042edd65fc1a78aa8375e9.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1276
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1276 -s 156
  2⤵
  - Program crash
  PID:2372

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/1276-0-0x0000000000FFE000-0x0000000001091000-memory.dmp

Filesize
588KB

Download
memory/1276-1-0x00000000008B0000-0x0000000001091000-memory.dmp

Filesize
7.9MB

Download
memory/1276-2-0x0000000000FFE000-0x0000000001091000-memory.dmp

Filesize
588KB

Download
memory/1276-3-0x00000000008B0000-0x0000000001091000-memory.dmp

Filesize
7.9MB

Download