expiro | dbb1d4153310bd43bde24f575cd462f0042332ef491298dc3588ed0300fdde38

Analysis

max time kernel
120s
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 12:52

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General

Target

JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe
Size

437KB
MD5

a060604dbbbabec10cbf3d5a5c27418e
SHA1

8125bb680923c8edf7575dce6c49423a0f85ba05
SHA256

dbb1d4153310bd43bde24f575cd462f0042332ef491298dc3588ed0300fdde38
SHA512

3589ad236cd6118f41e88bce96aa581b7b8269a0d7f6221f3431ca91d015639d9367c6df4d0b9d49a8085f26b139299a72f7b253e5a631a8adf71d1061436da0
SSDEEP

6144:UoVwm2i+mKaN68U8Wdvym8fXZkp/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:sri+m/A4Wx3UM/LzARMVO4sNyDm3F3U

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/2536-0-0x0000000001060000-0x00000000010F4000-memory.dmp	family_expiro1
behavioral1/memory/2536-1-0x0000000000FF0000-0x00000000010F4000-memory.dmp	family_expiro1
behavioral1/memory/2536-2-0x0000000001060000-0x00000000010F4000-memory.dmp	family_expiro1
behavioral1/memory/2536-3-0x0000000000FF0000-0x00000000010F4000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1816	2536	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_a060604dbbbabec10cbf3d5a5c27418e.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2536 wrote to memory of 1816	2536	JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe	30
PID 2536 wrote to memory of 1816	2536	JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe	30
PID 2536 wrote to memory of 1816	2536	JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe	30
PID 2536 wrote to memory of 1816	2536	JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_a060604dbbbabec10cbf3d5a5c27418e.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2536
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 160
  2⤵
  - Program crash
  PID:1816

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/2536-0-0x0000000001060000-0x00000000010F4000-memory.dmp

Filesize
592KB

Download
memory/2536-1-0x0000000000FF0000-0x00000000010F4000-memory.dmp

Filesize
1.0MB

Download
memory/2536-2-0x0000000001060000-0x00000000010F4000-memory.dmp

Filesize
592KB

Download
memory/2536-3-0x0000000000FF0000-0x00000000010F4000-memory.dmp

Filesize
1.0MB

Download