expiro | b61d0ea030d98bcf26d5e6ad21d02234ea6cdfc4a3303c9456edbf9aa9f49627

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 07:27

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General

Target

JaffaCakes118_9446474e1891350820484387790739f4.exe
Size

5.7MB
MD5

9446474e1891350820484387790739f4
SHA1

35d1300f88e3c0c32eda5ce181bcda27b7cc80e1
SHA256

b61d0ea030d98bcf26d5e6ad21d02234ea6cdfc4a3303c9456edbf9aa9f49627
SHA512

0618de0f0ae0997567eb17acdbae9327b04170a40415197aadf5743187bf51a6ec5d7400a77678abdc1329dba8ff53aa55170a4e669e304d4f26df25183564bb
SSDEEP

98304:HBv78HEFfNHX5rpiD0XTa3aLkBo6DjD7d/TLCQlQGpq6B:UEFfHp7X2NDjD7d3CQagqw

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/2680-0-0x00000000005C1000-0x0000000000655000-memory.dmp	family_expiro1
behavioral1/memory/2680-1-0x0000000000010000-0x0000000000655000-memory.dmp	family_expiro1
behavioral1/memory/2680-2-0x00000000005C1000-0x0000000000655000-memory.dmp	family_expiro1
behavioral1/memory/2680-3-0x0000000000010000-0x0000000000655000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2792	2680	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_9446474e1891350820484387790739f4.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 2792	2680	JaffaCakes118_9446474e1891350820484387790739f4.exe	30
PID 2680 wrote to memory of 2792	2680	JaffaCakes118_9446474e1891350820484387790739f4.exe	30
PID 2680 wrote to memory of 2792	2680	JaffaCakes118_9446474e1891350820484387790739f4.exe	30
PID 2680 wrote to memory of 2792	2680	JaffaCakes118_9446474e1891350820484387790739f4.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9446474e1891350820484387790739f4.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_9446474e1891350820484387790739f4.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2680 -s 208
  2⤵
  - Program crash
  PID:2792

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

Replay Monitor

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Downloads

memory/2680-0-0x00000000005C1000-0x0000000000655000-memory.dmp

Filesize
592KB

Download
memory/2680-1-0x0000000000010000-0x0000000000655000-memory.dmp

Filesize
6.3MB

Download
memory/2680-2-0x00000000005C1000-0x0000000000655000-memory.dmp

Filesize
592KB

Download
memory/2680-3-0x0000000000010000-0x0000000000655000-memory.dmp

Filesize
6.3MB

Download