expiro | fffa390025e871ab59e597f2cbffdf9e7886e03167da6035db668f10a5e16738

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
06-01-2025 13:31

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General

Target

JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe
Size

415KB
MD5

266359a27a8d109b09edb2ea27899aaa
SHA1

530712d78ae0c576c678cf9666258a308188567f
SHA256

fffa390025e871ab59e597f2cbffdf9e7886e03167da6035db668f10a5e16738
SHA512

5db192989cae2046e0701e5a0997ddc99c3be531d54cd7f36c734eb5392282446aa0af90cc109d4660d229658b60b2bdc6074c54547cb874655a3ce34ba2d401
SSDEEP

6144:qeg15wZeGboMX/uZfLiFHGwLaWl6EjzT+Jjr0LsJXE8Va41jmww:r4GbDX/uZDiNGszkv0QJXxVV1qL

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/2080-0-0x0000000000C6B000-0x0000000000CFE000-memory.dmp	family_expiro1
behavioral1/memory/2080-1-0x0000000000C00000-0x0000000000CFE000-memory.dmp	family_expiro1
behavioral1/memory/2080-2-0x0000000000C6B000-0x0000000000CFE000-memory.dmp	family_expiro1
behavioral1/memory/2080-3-0x0000000000C00000-0x0000000000CFE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2756	2080	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_266359a27a8d109b09edb2ea27899aaa.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 2756	2080	JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe	31
PID 2080 wrote to memory of 2756	2080	JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe	31
PID 2080 wrote to memory of 2756	2080	JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe	31
PID 2080 wrote to memory of 2756	2080	JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_266359a27a8d109b09edb2ea27899aaa.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2080
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2080 -s 64
  2⤵
  - Program crash
  PID:2756

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/2080-0-0x0000000000C6B000-0x0000000000CFE000-memory.dmp

Filesize
588KB

Download
memory/2080-1-0x0000000000C00000-0x0000000000CFE000-memory.dmp

Filesize
1016KB

Download
memory/2080-2-0x0000000000C6B000-0x0000000000CFE000-memory.dmp

Filesize
588KB

Download
memory/2080-3-0x0000000000C00000-0x0000000000CFE000-memory.dmp

Filesize
1016KB

Download