expiro | 7ae99c71371709eb39b02255de36dea86a91ac461dba0e04db1dccbfff2f9039

Analysis

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

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 07:14

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General

Target

JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe
Size

417KB
MD5

93a4bb1b1672d07128cc01f98ee00e5f
SHA1

677dbf9a459b234f9f960bf314b1c13e5cb78bcf
SHA256

7ae99c71371709eb39b02255de36dea86a91ac461dba0e04db1dccbfff2f9039
SHA512

51cca1cc80e2f950e20bfd974e806c4edeb9f67b52ad7685c421fca362cf3df7ae42cb1f803d924a7f788802507b4fa9e5778937710aee6b2deea8e21ba93987
SSDEEP

6144:6SpwTEOzPSK5U2SoJ8VWackrV1ZmXRWLgKocUq8nOfaIROo71YvK09lw+45B:N+IK5U2SoysImwLQcUqgsPBYv745B

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/1620-0-0x000000000116C000-0x00000000011FF000-memory.dmp	family_expiro1
behavioral1/memory/1620-1-0x0000000001100000-0x00000000011FF000-memory.dmp	family_expiro1
behavioral1/memory/1620-2-0x000000000116C000-0x00000000011FF000-memory.dmp	family_expiro1
behavioral1/memory/1620-3-0x0000000001100000-0x00000000011FF000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2084	1620	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_93a4bb1b1672d07128cc01f98ee00e5f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1620 wrote to memory of 2084	1620	JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe	30
PID 1620 wrote to memory of 2084	1620	JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe	30
PID 1620 wrote to memory of 2084	1620	JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe	30
PID 1620 wrote to memory of 2084	1620	JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_93a4bb1b1672d07128cc01f98ee00e5f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1620
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1620 -s 68
  2⤵
  - Program crash
  PID:2084

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/1620-0-0x000000000116C000-0x00000000011FF000-memory.dmp

Filesize
588KB

Download
memory/1620-1-0x0000000001100000-0x00000000011FF000-memory.dmp

Filesize
1020KB

Download
memory/1620-2-0x000000000116C000-0x00000000011FF000-memory.dmp

Filesize
588KB

Download
memory/1620-3-0x0000000001100000-0x00000000011FF000-memory.dmp

Filesize
1020KB

Download