expiro | de04cb4c08993f627b173f6dca07ff198a0eb598a9f2e9152fe1e8f31446e3e2

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 23:55

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General

Target

JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe
Size

415KB
MD5

028501aa5632c8a3f48ab38b36aa90c1
SHA1

1850338796fccf0e3bff8c41dcef965392a249ad
SHA256

de04cb4c08993f627b173f6dca07ff198a0eb598a9f2e9152fe1e8f31446e3e2
SHA512

f95852a31cbac0f32d887bb2e40e7cb384278e2d17b3932f855c98e422fa0b8b710754759f331c42d58acfa699e3293dd1cfa2fa57769622339eade8d95eebab
SSDEEP

12288:Z0M9eYNPHRAsdFTvbNjjSXN2mEmFioL1rny:ZH9Jp3d5RjjCs02

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/2092-0-0x00000000003FB000-0x000000000048E000-memory.dmp	family_expiro1
behavioral1/memory/2092-1-0x0000000000390000-0x000000000048E000-memory.dmp	family_expiro1
behavioral1/memory/2092-2-0x00000000003FB000-0x000000000048E000-memory.dmp	family_expiro1
behavioral1/memory/2092-3-0x0000000000390000-0x000000000048E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2804	2092	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_028501aa5632c8a3f48ab38b36aa90c1.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2092 wrote to memory of 2804	2092	JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe	31
PID 2092 wrote to memory of 2804	2092	JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe	31
PID 2092 wrote to memory of 2804	2092	JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe	31
PID 2092 wrote to memory of 2804	2092	JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_028501aa5632c8a3f48ab38b36aa90c1.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2092
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2092 -s 64
  2⤵
  - Program crash
  PID:2804

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/2092-0-0x00000000003FB000-0x000000000048E000-memory.dmp

Filesize
588KB

Download
memory/2092-1-0x0000000000390000-0x000000000048E000-memory.dmp

Filesize
1016KB

Download
memory/2092-2-0x00000000003FB000-0x000000000048E000-memory.dmp

Filesize
588KB

Download
memory/2092-3-0x0000000000390000-0x000000000048E000-memory.dmp

Filesize
1016KB

Download