expiro | 375f5c82edbfd1930a62db083b22f000a688673f21ba27d45687c0da8f54087d

Analysis

max time kernel
91s
max time network
16s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
08-01-2025 04:48

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General

Target

JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe
Size

415KB
MD5

8c2873d511977594add09a4e60531bd8
SHA1

9ebbc576a8fe3cba13f018a0197a74c7b438b72d
SHA256

375f5c82edbfd1930a62db083b22f000a688673f21ba27d45687c0da8f54087d
SHA512

871137e10534b8c2f2c2d8f22b5747ab53e37b66553135d40c848c12574bf7827cdc6fe79dfc6f412482ef06ada6aa10f0ba1cbb73a8e93bdaf8606eedd9566c
SSDEEP

6144:ldMUjQEJDsL8FK8cIF/mibypbcHVvZ9g+V2z5IY1ZOSA5w0eX1uIm4:4uzoliVubcZP365I+Zgw0g1T

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/2440-0-0x0000000000C1B000-0x0000000000CAE000-memory.dmp	family_expiro1
behavioral1/memory/2440-1-0x0000000000BB0000-0x0000000000CAE000-memory.dmp	family_expiro1
behavioral1/memory/2440-2-0x0000000000C1B000-0x0000000000CAE000-memory.dmp	family_expiro1
behavioral1/memory/2440-3-0x0000000000BB0000-0x0000000000CAE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2076	2440	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_8c2873d511977594add09a4e60531bd8.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2440 wrote to memory of 2076	2440	JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe	31
PID 2440 wrote to memory of 2076	2440	JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe	31
PID 2440 wrote to memory of 2076	2440	JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe	31
PID 2440 wrote to memory of 2076	2440	JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8c2873d511977594add09a4e60531bd8.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2440
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2440 -s 64
  2⤵
  - Program crash
  PID:2076

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/2440-0-0x0000000000C1B000-0x0000000000CAE000-memory.dmp

Filesize
588KB

Download
memory/2440-1-0x0000000000BB0000-0x0000000000CAE000-memory.dmp

Filesize
1016KB

Download
memory/2440-2-0x0000000000C1B000-0x0000000000CAE000-memory.dmp

Filesize
588KB

Download
memory/2440-3-0x0000000000BB0000-0x0000000000CAE000-memory.dmp

Filesize
1016KB

Download