expiro | 151f293e32a9f1c4af8347a53fb5651b7930cf855241bb3d92a869c5e721163b

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03-01-2025 22:34

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General

Target

JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe
Size

437KB
MD5

7216d9dc775aa07fd412d4d0642aaebf
SHA1

c775b19ef7b025f57a1d0847ed5304ae7ca876db
SHA256

151f293e32a9f1c4af8347a53fb5651b7930cf855241bb3d92a869c5e721163b
SHA512

c345645df0dcd4f87701ab0897e442a7b61584bbc09dab2dded75de7debfa1ee32bbc772f0bcbd7aadb145cc642cf485821429a5324833fc72d35724787f410c
SSDEEP

6144:UJVwm2i+mKaN68U8Wdvym8fXZkz/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:rri+m/A4Wx3Ua/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/1860-0-0x0000000000A70000-0x0000000000B04000-memory.dmp	family_expiro1
behavioral1/memory/1860-1-0x0000000000A00000-0x0000000000B04000-memory.dmp	family_expiro1
behavioral1/memory/1860-2-0x0000000000A70000-0x0000000000B04000-memory.dmp	family_expiro1
behavioral1/memory/1860-3-0x0000000000A00000-0x0000000000B04000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2276	1860	WerFault.exe	27

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_7216d9dc775aa07fd412d4d0642aaebf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1860 wrote to memory of 2276	1860	JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe	28
PID 1860 wrote to memory of 2276	1860	JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe	28
PID 1860 wrote to memory of 2276	1860	JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe	28
PID 1860 wrote to memory of 2276	1860	JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe	28

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_7216d9dc775aa07fd412d4d0642aaebf.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1860
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1860 -s 160
  2⤵
  - Program crash
  PID:2276

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/1860-0-0x0000000000A70000-0x0000000000B04000-memory.dmp

Filesize
592KB

Download
memory/1860-1-0x0000000000A00000-0x0000000000B04000-memory.dmp

Filesize
1.0MB

Download
memory/1860-2-0x0000000000A70000-0x0000000000B04000-memory.dmp

Filesize
592KB

Download
memory/1860-3-0x0000000000A00000-0x0000000000B04000-memory.dmp

Filesize
1.0MB

Download