expiro | 7d77569f20da9a3398562a418bd23330d5eace9c6535f1629494cc43a0d392fe

Analysis

max time kernel
122s
max time network
128s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
10-01-2025 21:13

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General

Target

JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe
Size

7.3MB
MD5

ee6fe9fea55774a46d555d5bd11d9d55
SHA1

40d3acfcec38cc3f8c63fc06fa03d23ecc340a5e
SHA256

7d77569f20da9a3398562a418bd23330d5eace9c6535f1629494cc43a0d392fe
SHA512

8dd16a54aa7bb14a4e26de0f95e3910ca62cc2d0cdb22ab957d13dc9b7716f0a85b91736ebb522d8b75c088f35b09e005046216af3e55ce0c36b305442189aff
SSDEEP

98304:OxC3ud6MOIvysiwCQKzo5qphIHVruP3WpF3UdE1hZHEdLFBmil+:BGQFMkhgJuP32+dmhZk/z

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/2332-0-0x00000000012EE000-0x0000000001381000-memory.dmp	family_expiro1
behavioral1/memory/2332-1-0x0000000000BA0000-0x0000000001381000-memory.dmp	family_expiro1
behavioral1/memory/2332-2-0x00000000012EE000-0x0000000001381000-memory.dmp	family_expiro1
behavioral1/memory/2332-3-0x0000000000BA0000-0x0000000001381000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2536	2332	WerFault.exe	30

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_ee6fe9fea55774a46d555d5bd11d9d55.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2332 wrote to memory of 2536	2332	JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe	31
PID 2332 wrote to memory of 2536	2332	JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe	31
PID 2332 wrote to memory of 2536	2332	JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe	31
PID 2332 wrote to memory of 2536	2332	JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ee6fe9fea55774a46d555d5bd11d9d55.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2332
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2332 -s 156
  2⤵
  - Program crash
  PID:2536

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

Replay Monitor

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Downloads

memory/2332-0-0x00000000012EE000-0x0000000001381000-memory.dmp

Filesize
588KB

Download
memory/2332-1-0x0000000000BA0000-0x0000000001381000-memory.dmp

Filesize
7.9MB

Download
memory/2332-2-0x00000000012EE000-0x0000000001381000-memory.dmp

Filesize
588KB

Download
memory/2332-3-0x0000000000BA0000-0x0000000001381000-memory.dmp

Filesize
7.9MB

Download