expiro | 9222c89d1ab5cbe9b2205c28bf8d28c86adedfd4ee419aec2cd8219a0b210c48

Analysis

max time kernel
117s
max time network
117s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03/01/2025, 08:45

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General

Target

JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe
Size

417KB
MD5

6b7650b7e071137377c8b63540091cf2
SHA1

f12b77fc16316e3bf2381314bf220564de49cc6d
SHA256

9222c89d1ab5cbe9b2205c28bf8d28c86adedfd4ee419aec2cd8219a0b210c48
SHA512

aa2a372604937bfc9e8afa9627d17ab3c83e6f19931f9ba95afe5fb9cdbefeecb6bbd1127cc86b0ce60cb90a57d6984d249a04813adb0d204cda850b6c78b7b3
SSDEEP

6144:ASpwTEOzPSK5U2SoJ8VWackXV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:f+IK5U2Soys8mwLQcUqgsPBYv745B

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/1344-0-0x00000000001DC000-0x000000000026F000-memory.dmp	family_expiro1
behavioral1/memory/1344-1-0x0000000000170000-0x000000000026F000-memory.dmp	family_expiro1
behavioral1/memory/1344-2-0x00000000001DC000-0x000000000026F000-memory.dmp	family_expiro1
behavioral1/memory/1344-3-0x0000000000170000-0x000000000026F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2148	1344	WerFault.exe	27

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_6b7650b7e071137377c8b63540091cf2.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1344 wrote to memory of 2148	1344	JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe	28
PID 1344 wrote to memory of 2148	1344	JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe	28
PID 1344 wrote to memory of 2148	1344	JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe	28
PID 1344 wrote to memory of 2148	1344	JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe	28

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_6b7650b7e071137377c8b63540091cf2.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1344
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1344 -s 68
  2⤵
  - Program crash
  PID:2148

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/1344-0-0x00000000001DC000-0x000000000026F000-memory.dmp

Filesize
588KB

Download
memory/1344-1-0x0000000000170000-0x000000000026F000-memory.dmp

Filesize
1020KB

Download
memory/1344-2-0x00000000001DC000-0x000000000026F000-memory.dmp

Filesize
588KB

Download
memory/1344-3-0x0000000000170000-0x000000000026F000-memory.dmp

Filesize
1020KB

Download