expiro | c95b33c8f04267b719df3d1206dc2e7ec00f35cf5d26ff1b71a62fca8033cc2c

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 00:31

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General

Target

JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe
Size

415KB
MD5

7f933f4e7451e1aa0c8b9c38c43a81c9
SHA1

888b20e270a4c42f0ac8eb991e2f0e69ed388d41
SHA256

c95b33c8f04267b719df3d1206dc2e7ec00f35cf5d26ff1b71a62fca8033cc2c
SHA512

f967c462af3f60a43c9ff05c227e8968012fbb377ee35da5d983fe280afef6c9fabf3a32a74b915f63ef49ece9c6459c523fb871232b23c3d015c40728a9e5c4
SSDEEP

6144:HaeeLHupH8wcoTA2nDJGvRld7M5zhRcl+Vj6gvH0mXK7Y9xKiTgXqqbgG/1EPB:reLkYCgldAhRcloe4y7YCmzr8E

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/1980-0-0x000000000029B000-0x000000000032E000-memory.dmp	family_expiro1
behavioral1/memory/1980-1-0x0000000000230000-0x000000000032E000-memory.dmp	family_expiro1
behavioral1/memory/1980-2-0x000000000029B000-0x000000000032E000-memory.dmp	family_expiro1
behavioral1/memory/1980-3-0x0000000000230000-0x000000000032E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3056	1980	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_7f933f4e7451e1aa0c8b9c38c43a81c9.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1980 wrote to memory of 3056	1980	JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe	31
PID 1980 wrote to memory of 3056	1980	JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe	31
PID 1980 wrote to memory of 3056	1980	JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe	31
PID 1980 wrote to memory of 3056	1980	JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7f933f4e7451e1aa0c8b9c38c43a81c9.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1980
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1980 -s 64
  2⤵
  - Program crash
  PID:3056

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/1980-0-0x000000000029B000-0x000000000032E000-memory.dmp

Filesize
588KB

Download
memory/1980-1-0x0000000000230000-0x000000000032E000-memory.dmp

Filesize
1016KB

Download
memory/1980-2-0x000000000029B000-0x000000000032E000-memory.dmp

Filesize
588KB

Download
memory/1980-3-0x0000000000230000-0x000000000032E000-memory.dmp

Filesize
1016KB

Download