expiro | f3886db074ef102cb969e2bec1fc41aeb2af01b5029d79b0f76eaba5b1cf95ab

Analysis

max time kernel
118s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
01-01-2025 10:23

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General

Target

JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe
Size

437KB
MD5

516a6138a51d0907a37f0ae0e020a535
SHA1

27a2b8b7a13b7b5adbd5b9ec8d68048248243f3d
SHA256

f3886db074ef102cb969e2bec1fc41aeb2af01b5029d79b0f76eaba5b1cf95ab
SHA512

2f58baee149f9c01ec96ea6dd0693064999ce889559e372e98601a6c0728e6c6a7eb1c1d90dbe3ba0692f87734c0b31f557cce27244ae5eeb43b4f1b19565ccc
SSDEEP

6144:UEVwm2i+mKaN68U8Wdvym8fXZkU/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:8ri+m/A4Wx3Up/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/2312-0-0x0000000000AD0000-0x0000000000B64000-memory.dmp	family_expiro1
behavioral1/memory/2312-1-0x0000000000A60000-0x0000000000B64000-memory.dmp	family_expiro1
behavioral1/memory/2312-2-0x0000000000AD0000-0x0000000000B64000-memory.dmp	family_expiro1
behavioral1/memory/2312-3-0x0000000000A60000-0x0000000000B64000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2492	2312	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_516a6138a51d0907a37f0ae0e020a535.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2312 wrote to memory of 2492	2312	JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe	30
PID 2312 wrote to memory of 2492	2312	JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe	30
PID 2312 wrote to memory of 2492	2312	JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe	30
PID 2312 wrote to memory of 2492	2312	JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_516a6138a51d0907a37f0ae0e020a535.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2312
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2312 -s 160
  2⤵
  - Program crash
  PID:2492

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/2312-0-0x0000000000AD0000-0x0000000000B64000-memory.dmp

Filesize
592KB

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memory/2312-1-0x0000000000A60000-0x0000000000B64000-memory.dmp

Filesize
1.0MB

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memory/2312-2-0x0000000000AD0000-0x0000000000B64000-memory.dmp

Filesize
592KB

Download
memory/2312-3-0x0000000000A60000-0x0000000000B64000-memory.dmp

Filesize
1.0MB

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