expiro | 1897d2cd74f5166d766c95ec316726b710b8567d221e946de46e5372a9f01c18

Analysis

max time kernel
122s
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 00:01

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General

Target

JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe
Size

476KB
MD5

d5bf630d95667515ec8d0465d9f21d99
SHA1

a1cfe231b1cc995f453b78549cde501f1b2ad90c
SHA256

1897d2cd74f5166d766c95ec316726b710b8567d221e946de46e5372a9f01c18
SHA512

5d3551d1f00ad441fc3ee05a081080e42784ac28777b9a030b5bce7feb28dc9271f58e13e4dc3e82ca8c20b000b723b1e6974ebd047fa9f64308cd39a95e4dc5
SSDEEP

12288:jYmIjE7eNdKcWEbl2Ubr4TgyUbZm6qCs8e/G:B7eNAYbl2Ub8T5geL

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/2124-0-0x000000000031B000-0x00000000003AF000-memory.dmp	family_expiro1
behavioral1/memory/2124-1-0x00000000002A0000-0x00000000003AF000-memory.dmp	family_expiro1
behavioral1/memory/2124-2-0x000000000031B000-0x00000000003AF000-memory.dmp	family_expiro1
behavioral1/memory/2124-3-0x00000000002A0000-0x00000000003AF000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2140	2124	WerFault.exe	27

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_d5bf630d95667515ec8d0465d9f21d99.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 2140	2124	JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe	29
PID 2124 wrote to memory of 2140	2124	JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe	29
PID 2124 wrote to memory of 2140	2124	JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe	29
PID 2124 wrote to memory of 2140	2124	JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe	29

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d5bf630d95667515ec8d0465d9f21d99.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2124
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2124 -s 144
  2⤵
  - Program crash
  PID:2140

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/2124-0-0x000000000031B000-0x00000000003AF000-memory.dmp

Filesize
592KB

Download
memory/2124-1-0x00000000002A0000-0x00000000003AF000-memory.dmp

Filesize
1.1MB

Download
memory/2124-2-0x000000000031B000-0x00000000003AF000-memory.dmp

Filesize
592KB

Download
memory/2124-3-0x00000000002A0000-0x00000000003AF000-memory.dmp

Filesize
1.1MB

Download