expiro | a739e1085de97d53c3627044ca93f7a510e252edd3443e7a46062198b368af73

Analysis

max time kernel
94s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-01-2025 06:00

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General

Target

JaffaCakes118_dcb338d6345d14066fd5923b7b1c280b.exe
Size

415KB
MD5

dcb338d6345d14066fd5923b7b1c280b
SHA1

b9c52352e04f82469ae1c31b19db5117635364a6
SHA256

a739e1085de97d53c3627044ca93f7a510e252edd3443e7a46062198b368af73
SHA512

b67d6b2fe0efe6b5ca23fb4af32ed7654cf74fec46aa2e0ab417543338d45162ce074d1c58d066dfd55db30ea57b39cf3fc60ba611e95c80024cee8516f49894
SSDEEP

6144:KtSPOR3w6LRnlul6fJww4pXSwLOrOth/W0Ux5N53rAiIZvl1m0WZBquHA:iSYdPucfqYMOrO/WRLm3m0WZS

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/2032-0-0x000000000010B000-0x000000000019E000-memory.dmp	family_expiro1
behavioral2/memory/2032-1-0x00000000000A0000-0x000000000019E000-memory.dmp	family_expiro1
behavioral2/memory/2032-2-0x000000000010B000-0x000000000019E000-memory.dmp	family_expiro1
behavioral2/memory/2032-3-0x00000000000A0000-0x000000000019E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2668	2032	WerFault.exe	81

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_dcb338d6345d14066fd5923b7b1c280b.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_dcb338d6345d14066fd5923b7b1c280b.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_dcb338d6345d14066fd5923b7b1c280b.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:2032
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2032 -s 256
  2⤵
  - Program crash
  PID:2668

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2032 -ip 2032
1⤵
PID:4736

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/2032-0-0x000000000010B000-0x000000000019E000-memory.dmp

Filesize
588KB

Download
memory/2032-1-0x00000000000A0000-0x000000000019E000-memory.dmp

Filesize
1016KB

Download
memory/2032-2-0x000000000010B000-0x000000000019E000-memory.dmp

Filesize
588KB

Download
memory/2032-3-0x00000000000A0000-0x000000000019E000-memory.dmp

Filesize
1016KB

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