expiro | 96bb8fff7101f2de7a2661b7b9ca6883e6d90cea45b56c8336c0a3b12f884306

Analysis

max time kernel
122s
max time network
126s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 05:14

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General

Target

JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe
Size

437KB
MD5

8db9aab317b07df2d6f1ca1a3e374ba9
SHA1

a1bfa0309ab930349054edbbc2531257e7aed7d6
SHA256

96bb8fff7101f2de7a2661b7b9ca6883e6d90cea45b56c8336c0a3b12f884306
SHA512

24902fb061c627ba540861d5d331543e89d2c8a739313844a549b26ffbc9beab053e95f18a4ff14a2f23d3f69653e9175993edf5c8bb7a64941b9283c70b2b9e
SSDEEP

6144:ULVwm2i+mKaN68U8Wdvym8fXZkI/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:Vri+m/A4Wx3Ul/LzARMVO4sNyDm3F3U

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/3068-0-0x00000000000E0000-0x0000000000174000-memory.dmp	family_expiro1
behavioral1/memory/3068-1-0x0000000000070000-0x0000000000174000-memory.dmp	family_expiro1
behavioral1/memory/3068-2-0x00000000000E0000-0x0000000000174000-memory.dmp	family_expiro1
behavioral1/memory/3068-3-0x0000000000070000-0x0000000000174000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2280	3068	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_8db9aab317b07df2d6f1ca1a3e374ba9.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3068 wrote to memory of 2280	3068	JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe	30
PID 3068 wrote to memory of 2280	3068	JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe	30
PID 3068 wrote to memory of 2280	3068	JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe	30
PID 3068 wrote to memory of 2280	3068	JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8db9aab317b07df2d6f1ca1a3e374ba9.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3068
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3068 -s 160
  2⤵
  - Program crash
  PID:2280

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/3068-0-0x00000000000E0000-0x0000000000174000-memory.dmp

Filesize
592KB

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memory/3068-1-0x0000000000070000-0x0000000000174000-memory.dmp

Filesize
1.0MB

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memory/3068-2-0x00000000000E0000-0x0000000000174000-memory.dmp

Filesize
592KB

Download
memory/3068-3-0x0000000000070000-0x0000000000174000-memory.dmp

Filesize
1.0MB

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