expiro | 1fbdccf626c6e122c6165ff8edf6ccf216403e0e2827d983c663551b964ce176

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
06-01-2025 06:10

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General

Target

JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe
Size

5.7MB
MD5

12c15487756cbba93300f0bf747a626b
SHA1

35a83d8a85b4069b772c23aa558885e748d40ebb
SHA256

1fbdccf626c6e122c6165ff8edf6ccf216403e0e2827d983c663551b964ce176
SHA512

c145c55d09006574284a5dca9e59c18385cb135df379b8e93581ebf884dbb6c4559eee979d5392d81b7b034dd1ca0efa827d1175f18c46128ab229d53bec8a86
SSDEEP

98304:oBv78HEFfNHX5rpiD0XTa3aLkBo6DjD7d/TLCQlQGrq6B:rEFfHp7X2NDjD7d3CQaeqw

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/2084-0-0x0000000001651000-0x00000000016E5000-memory.dmp	family_expiro1
behavioral1/memory/2084-1-0x00000000010A0000-0x00000000016E5000-memory.dmp	family_expiro1
behavioral1/memory/2084-2-0x0000000001651000-0x00000000016E5000-memory.dmp	family_expiro1
behavioral1/memory/2084-3-0x00000000010A0000-0x00000000016E5000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2672	2084	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_12c15487756cbba93300f0bf747a626b.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 2672	2084	JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe	30
PID 2084 wrote to memory of 2672	2084	JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe	30
PID 2084 wrote to memory of 2672	2084	JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe	30
PID 2084 wrote to memory of 2672	2084	JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_12c15487756cbba93300f0bf747a626b.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2084
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2084 -s 204
  2⤵
  - Program crash
  PID:2672

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/2084-0-0x0000000001651000-0x00000000016E5000-memory.dmp

Filesize
592KB

Download
memory/2084-1-0x00000000010A0000-0x00000000016E5000-memory.dmp

Filesize
6.3MB

Download
memory/2084-2-0x0000000001651000-0x00000000016E5000-memory.dmp

Filesize
592KB

Download
memory/2084-3-0x00000000010A0000-0x00000000016E5000-memory.dmp

Filesize
6.3MB

Download