expiro | f3886db074ef102cb969e2bec1fc41aeb2af01b5029d79b0f76eaba5b1cf95ab

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01-01-2025 10:23

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General

Target

JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe
Size

437KB
MD5

516a6138a51d0907a37f0ae0e020a535
SHA1

27a2b8b7a13b7b5adbd5b9ec8d68048248243f3d
SHA256

f3886db074ef102cb969e2bec1fc41aeb2af01b5029d79b0f76eaba5b1cf95ab
SHA512

2f58baee149f9c01ec96ea6dd0693064999ce889559e372e98601a6c0728e6c6a7eb1c1d90dbe3ba0692f87734c0b31f557cce27244ae5eeb43b4f1b19565ccc
SSDEEP

6144:UEVwm2i+mKaN68U8Wdvym8fXZkU/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:8ri+m/A4Wx3Up/LzARMVO4sNyDm3F3U

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
behavioral2/memory/1388-0-0x00000000004D0000-0x0000000000564000-memory.dmp	family_expiro1
behavioral2/memory/1388-1-0x0000000000460000-0x0000000000564000-memory.dmp	family_expiro1
behavioral2/memory/1388-2-0x00000000004D0000-0x0000000000564000-memory.dmp	family_expiro1
behavioral2/memory/1388-3-0x0000000000460000-0x0000000000564000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4456	1388	WerFault.exe	82

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_516a6138a51d0907a37f0ae0e020a535.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:1388
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1388 -s 480
  2⤵
  - Program crash
  PID:4456

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1388 -ip 1388
1⤵
PID:2032

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/1388-0-0x00000000004D0000-0x0000000000564000-memory.dmp

Filesize
592KB

Download
memory/1388-1-0x0000000000460000-0x0000000000564000-memory.dmp

Filesize
1.0MB

Download
memory/1388-2-0x00000000004D0000-0x0000000000564000-memory.dmp

Filesize
592KB

Download
memory/1388-3-0x0000000000460000-0x0000000000564000-memory.dmp

Filesize
1.0MB

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