expiro | 8502dc2c6402fa440b4f49e9ebab5107b12293198bf3eff329b73688ae08df4a

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
07-01-2025 10:14

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General

Target

JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe
Size

415KB
MD5

5d15c175b307109b5954fae44f5b7b3a
SHA1

4f54ec5b6692c24247af8618e81972d54fc15e36
SHA256

8502dc2c6402fa440b4f49e9ebab5107b12293198bf3eff329b73688ae08df4a
SHA512

e638d44e9b4fd4e9575d81a502f45d829fa91127bca75faa63d1a78944ccffcd9d704acc9e08dcd0e1efafe07dcf5baf7221c644c4d139786e0dc528fafef4e3
SSDEEP

6144:KYQ946HyibEAWtwsjOhgysGS1wVIJGnvNlnoz2l+sd4xruzg+jnzB2vmgUEfdqU9:GVecfsGPVIJGnfJfiulcmgUEfMU

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/3064-0-0x000000000068B000-0x000000000071E000-memory.dmp	family_expiro1
behavioral1/memory/3064-1-0x0000000000620000-0x000000000071E000-memory.dmp	family_expiro1
behavioral1/memory/3064-2-0x000000000068B000-0x000000000071E000-memory.dmp	family_expiro1
behavioral1/memory/3064-3-0x0000000000620000-0x000000000071E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2544	3064	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_5d15c175b307109b5954fae44f5b7b3a.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3064 wrote to memory of 2544	3064	JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe	31
PID 3064 wrote to memory of 2544	3064	JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe	31
PID 3064 wrote to memory of 2544	3064	JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe	31
PID 3064 wrote to memory of 2544	3064	JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_5d15c175b307109b5954fae44f5b7b3a.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3064
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3064 -s 64
  2⤵
  - Program crash
  PID:2544

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/3064-0-0x000000000068B000-0x000000000071E000-memory.dmp

Filesize
588KB

Download
memory/3064-1-0x0000000000620000-0x000000000071E000-memory.dmp

Filesize
1016KB

Download
memory/3064-2-0x000000000068B000-0x000000000071E000-memory.dmp

Filesize
588KB

Download
memory/3064-3-0x0000000000620000-0x000000000071E000-memory.dmp

Filesize
1016KB

Download