expiro | 4890ac5d3a6f6d57b6860b0699f06676910389dc09a638ee69e679eb85e6a7d9

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08-01-2025 18:49

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General

Target

JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe
Size

411KB
MD5

a5e65fd9a6c6a481e9549e1a1e6108b2
SHA1

b0506d73d700de09d841b2333158944a4a5e4365
SHA256

4890ac5d3a6f6d57b6860b0699f06676910389dc09a638ee69e679eb85e6a7d9
SHA512

335e84a545aeca55d11c70c8b159b3a8a4f0832cba33baab0b4125330e4e4bd236931773f2e2afc3e90192f7fece6546772aed537fb29e063cee22e0b672ca80
SSDEEP

12288:uetLagza/unbxptRNWXkVTTM5ct0bDMT:uettMMbxpbNMk12c20T

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/2764-0-0x0000000000B4B000-0x0000000000BDE000-memory.dmp	family_expiro1
behavioral1/memory/2764-1-0x0000000000AE0000-0x0000000000BDE000-memory.dmp	family_expiro1
behavioral1/memory/2764-2-0x0000000000B4B000-0x0000000000BDE000-memory.dmp	family_expiro1
behavioral1/memory/2764-3-0x0000000000AE0000-0x0000000000BDE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2688	2764	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_a5e65fd9a6c6a481e9549e1a1e6108b2.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2764 wrote to memory of 2688	2764	JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe	30
PID 2764 wrote to memory of 2688	2764	JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe	30
PID 2764 wrote to memory of 2688	2764	JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe	30
PID 2764 wrote to memory of 2688	2764	JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a5e65fd9a6c6a481e9549e1a1e6108b2.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2764
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2764 -s 96
  2⤵
  - Program crash
  PID:2688

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/2764-0-0x0000000000B4B000-0x0000000000BDE000-memory.dmp

Filesize
588KB

Download
memory/2764-1-0x0000000000AE0000-0x0000000000BDE000-memory.dmp

Filesize
1016KB

Download
memory/2764-2-0x0000000000B4B000-0x0000000000BDE000-memory.dmp

Filesize
588KB

Download
memory/2764-3-0x0000000000AE0000-0x0000000000BDE000-memory.dmp

Filesize
1016KB

Download