expiro | 0e89768a9b48f3d5db3beb9a9dca801b2102d19e1ddaf4913a15cdf89073e490

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08/01/2025, 11:16

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General

Target

JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe
Size

415KB
MD5

9c996a351e26bdde056103e58e34bc02
SHA1

f677ab5ca6476d27e9640659df7e9559a52fb903
SHA256

0e89768a9b48f3d5db3beb9a9dca801b2102d19e1ddaf4913a15cdf89073e490
SHA512

c4299dc8c54b564b80a6a418d1b830ed01d2e2f1bd652583df976c1cfdf6649f73fed1339d8c5f3bea9c3c1049397dbd8aa366a4a7306dc0ccd7caf81d650243
SSDEEP

6144:myS4J2Y559pSGwuER13hMIOK+5Xuk1Bzx4+YroOVPONwjsPGbbKM4m4:xfhjwdR13hMIOJAkzCmO4N+KNl

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/2012-0-0x00000000004DB000-0x000000000056E000-memory.dmp	family_expiro1
behavioral1/memory/2012-1-0x0000000000470000-0x000000000056E000-memory.dmp	family_expiro1
behavioral1/memory/2012-2-0x00000000004DB000-0x000000000056E000-memory.dmp	family_expiro1
behavioral1/memory/2012-3-0x0000000000470000-0x000000000056E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2576	2012	WerFault.exe	29

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_9c996a351e26bdde056103e58e34bc02.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2012 wrote to memory of 2576	2012	JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe	31
PID 2012 wrote to memory of 2576	2012	JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe	31
PID 2012 wrote to memory of 2576	2012	JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe	31
PID 2012 wrote to memory of 2576	2012	JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9c996a351e26bdde056103e58e34bc02.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2012
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2012 -s 64
  2⤵
  - Program crash
  PID:2576

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/2012-0-0x00000000004DB000-0x000000000056E000-memory.dmp

Filesize
588KB

Download
memory/2012-1-0x0000000000470000-0x000000000056E000-memory.dmp

Filesize
1016KB

Download
memory/2012-2-0x00000000004DB000-0x000000000056E000-memory.dmp

Filesize
588KB

Download
memory/2012-3-0x0000000000470000-0x000000000056E000-memory.dmp

Filesize
1016KB

Download