expiro | b07d71227a801af09087306e196804f97dbdba3dc3c5649b3423f8bcc8bd7b82

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08/01/2025, 05:39

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General

Target

JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe
Size

417KB
MD5

8e791c6cc8238b9e3cdb25658fb6f67b
SHA1

e8e6c5df5deda3232787b81fa28dbc01519e9094
SHA256

b07d71227a801af09087306e196804f97dbdba3dc3c5649b3423f8bcc8bd7b82
SHA512

a2bb0a28988d137df012aa3d29d23bc98451af5558c56ec947176c3b2bad213c87881552e42d4d3dafea38ed6af98d45fd4888749123ccd0bd9e4a4ff426ce4f
SSDEEP

6144:QSpwTEOzPSK5U2SoJ8VWackEV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:v+IK5U2SoysHmwLQcUqgsPBYv745B

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/2248-0-0x00000000002CC000-0x000000000035F000-memory.dmp	family_expiro1
behavioral1/memory/2248-1-0x0000000000260000-0x000000000035F000-memory.dmp	family_expiro1
behavioral1/memory/2248-2-0x00000000002CC000-0x000000000035F000-memory.dmp	family_expiro1
behavioral1/memory/2248-3-0x0000000000260000-0x000000000035F000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1988	2248	WerFault.exe	30

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_8e791c6cc8238b9e3cdb25658fb6f67b.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 1988	2248	JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe	31
PID 2248 wrote to memory of 1988	2248	JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe	31
PID 2248 wrote to memory of 1988	2248	JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe	31
PID 2248 wrote to memory of 1988	2248	JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8e791c6cc8238b9e3cdb25658fb6f67b.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2248
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2248 -s 68
  2⤵
  - Program crash
  PID:1988

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/2248-0-0x00000000002CC000-0x000000000035F000-memory.dmp

Filesize
588KB

Download
memory/2248-1-0x0000000000260000-0x000000000035F000-memory.dmp

Filesize
1020KB

Download
memory/2248-2-0x00000000002CC000-0x000000000035F000-memory.dmp

Filesize
588KB

Download
memory/2248-3-0x0000000000260000-0x000000000035F000-memory.dmp

Filesize
1020KB

Download