expiro | ed99c19e3574bc5743f7a841c461929cc5bc8be0787a39ed3784cee917107d5a

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
11-01-2025 05:24

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General

Target

JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe
Size

411KB
MD5

f823a7093aec2085cfd74f86b4542a8f
SHA1

b9d294578115479a2384069a6bd4737fc0814911
SHA256

ed99c19e3574bc5743f7a841c461929cc5bc8be0787a39ed3784cee917107d5a
SHA512

fcfbde11fc57f2b77e5cc17143e71728c93e2f5fb0fbc51ee994f80112cb2b9d81679d085ed966eed2fbb69a6ca48f655df978371ca4ab3dddd819bf36ec4f74
SSDEEP

12288:DetLagza/unbxpt7NWXkVTTM5ct0bDMT:DettMMbxphNMk12c20T

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/2248-0-0x0000000000CAB000-0x0000000000D3E000-memory.dmp	family_expiro1
behavioral1/memory/2248-1-0x0000000000C40000-0x0000000000D3E000-memory.dmp	family_expiro1
behavioral1/memory/2248-2-0x0000000000CAB000-0x0000000000D3E000-memory.dmp	family_expiro1
behavioral1/memory/2248-3-0x0000000000C40000-0x0000000000D3E000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2688	2248	WerFault.exe	30

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_f823a7093aec2085cfd74f86b4542a8f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 2688	2248	JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe	31
PID 2248 wrote to memory of 2688	2248	JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe	31
PID 2248 wrote to memory of 2688	2248	JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe	31
PID 2248 wrote to memory of 2688	2248	JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe	31

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f823a7093aec2085cfd74f86b4542a8f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2248
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2248 -s 96
  2⤵
  - Program crash
  PID:2688

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/2248-0-0x0000000000CAB000-0x0000000000D3E000-memory.dmp

Filesize
588KB

Download
memory/2248-1-0x0000000000C40000-0x0000000000D3E000-memory.dmp

Filesize
1016KB

Download
memory/2248-2-0x0000000000CAB000-0x0000000000D3E000-memory.dmp

Filesize
588KB

Download
memory/2248-3-0x0000000000C40000-0x0000000000D3E000-memory.dmp

Filesize
1016KB

Download