expiro | a663daf8e3e258246aa9c5979e110f0bc00cd4c7efb95932557998af9aa6f05f

Analysis

max time kernel
104s
max time network
128s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
13/04/2025, 02:08

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General

Target

JaffaCakes118_b341048550c301ee95c8a58c5fdbe8f5.exe
Size

200KB
MD5

b341048550c301ee95c8a58c5fdbe8f5
SHA1

213c35b7f693a39a378544811c671a746dc73a9d
SHA256

a663daf8e3e258246aa9c5979e110f0bc00cd4c7efb95932557998af9aa6f05f
SHA512

9705ac5ffa44e20ab1c6a169e39756d46b100e29c4f17cc83a01d131823b2ecfe746d0ed9550685013b0fa52df6c9f2ece6b057aad687ddfc1117899acc44ea7
SSDEEP

3072:j90cin+tQmBJCHBgyAc8/YKyCyWXNxdBBXaQczOvcP81eWReAtK2MgfbiEI:J0NnJ6JCh8/YK3XtkmZkAtRfbiE

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 1 IoCs

backdoor

resource	yara_rule
behavioral1/memory/376-1-0x0000000001000000-0x0000000001081000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3464	376	WerFault.exe	84

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_b341048550c301ee95c8a58c5fdbe8f5.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b341048550c301ee95c8a58c5fdbe8f5.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_b341048550c301ee95c8a58c5fdbe8f5.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:376
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 376 -s 308
  2⤵
  - Program crash
  PID:3464

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 376 -ip 376
1⤵
PID:2536

Network

MITRE ATT&CK Enterprise v16

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/376-0-0x0000000001000000-0x0000000001081000-memory.dmp

Filesize
516KB

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memory/376-1-0x0000000001000000-0x0000000001081000-memory.dmp

Filesize
516KB

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