expiro | 212918a42f744a3cdc9c42aae2dd287ad3d33facfc3a85a484f73cad6e592dc3

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10/01/2025, 21:40

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General

Target

JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe
Size

417KB
MD5

eeff2ab6ead0a81df9718b2de5d81d08
SHA1

5d63253476d72137ab4b191a4d944db5db911343
SHA256

212918a42f744a3cdc9c42aae2dd287ad3d33facfc3a85a484f73cad6e592dc3
SHA512

69a46535869c7116b269696eb41be2999ff76da84f8abe7e4141782371607dc83d4b07a84e1d3418134e86417da549f42a0126dc23d5a39d964ea8495b3513ed
SSDEEP

6144:BSpwTxz8fEYga22UHHXyDArvBIM6zOt3ONgEox946lzmEZYS5+oj9COdbeOut8MQ:I+lAfEYAtHCDArvxeOkjo46hjYJQ0mN

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/2528-0-0x000000000039C000-0x000000000042F000-memory.dmp	family_expiro1
behavioral1/memory/2528-1-0x0000000000330000-0x000000000042F000-memory.dmp	family_expiro1
behavioral1/memory/2528-2-0x000000000039C000-0x000000000042F000-memory.dmp	family_expiro1
behavioral1/memory/2528-3-0x0000000000330000-0x000000000042F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2360	2528	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_eeff2ab6ead0a81df9718b2de5d81d08.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2528 wrote to memory of 2360	2528	JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe	30
PID 2528 wrote to memory of 2360	2528	JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe	30
PID 2528 wrote to memory of 2360	2528	JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe	30
PID 2528 wrote to memory of 2360	2528	JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_eeff2ab6ead0a81df9718b2de5d81d08.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2528
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2528 -s 68
  2⤵
  - Program crash
  PID:2360

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/2528-0-0x000000000039C000-0x000000000042F000-memory.dmp

Filesize
588KB

Download
memory/2528-1-0x0000000000330000-0x000000000042F000-memory.dmp

Filesize
1020KB

Download
memory/2528-2-0x000000000039C000-0x000000000042F000-memory.dmp

Filesize
588KB

Download
memory/2528-3-0x0000000000330000-0x000000000042F000-memory.dmp

Filesize
1020KB

Download