expiro | c6a4adf1fa589b970fba8ac2ae20270459970cf3248ecb98899520906957a1b3

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
07-01-2025 02:54

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General

Target

JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe
Size

415KB
MD5

496de6ace80e09ab76afe6aa4e4eb69f
SHA1

814658893651140395e61b97f5e32a4ea7f6d2d8
SHA256

c6a4adf1fa589b970fba8ac2ae20270459970cf3248ecb98899520906957a1b3
SHA512

fb66edb256942b805881ba2aeddc1762ce0dd46e9dd1055fd099415a09843b29bc5c1cd748947c8d022716056c6b493abdafbc3e92e5ff2f52b949cdea622f40
SSDEEP

6144:E2x7IFrR9KIyxvI+l1N1LRW/qzm0AwWS2B7MIkfZuk2XZIGN:RIFt9KIwfl1NHW/q9UMIkxupZx

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/2108-0-0x0000000000B6B000-0x0000000000BFE000-memory.dmp	family_expiro1
behavioral1/memory/2108-1-0x0000000000B00000-0x0000000000BFE000-memory.dmp	family_expiro1
behavioral1/memory/2108-2-0x0000000000B6B000-0x0000000000BFE000-memory.dmp	family_expiro1
behavioral1/memory/2108-3-0x0000000000B00000-0x0000000000BFE000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3056	2108	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_496de6ace80e09ab76afe6aa4e4eb69f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2108 wrote to memory of 3056	2108	JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe	31
PID 2108 wrote to memory of 3056	2108	JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe	31
PID 2108 wrote to memory of 3056	2108	JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe	31
PID 2108 wrote to memory of 3056	2108	JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_496de6ace80e09ab76afe6aa4e4eb69f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2108
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2108 -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/2108-0-0x0000000000B6B000-0x0000000000BFE000-memory.dmp

Filesize
588KB

Download
memory/2108-1-0x0000000000B00000-0x0000000000BFE000-memory.dmp

Filesize
1016KB

Download
memory/2108-2-0x0000000000B6B000-0x0000000000BFE000-memory.dmp

Filesize
588KB

Download
memory/2108-3-0x0000000000B00000-0x0000000000BFE000-memory.dmp

Filesize
1016KB

Download