expiro | 49743c2e8e3d1ff87eb95d633804f3e215a344323699085096b5e832b3ae55dc

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
10-01-2025 05:44

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General

Target

JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe
Size

482KB
MD5

dc64fb891964a7694201dc450ccc7a4f
SHA1

cb214a7979e99b4445610d2e2064ae90c6146053
SHA256

49743c2e8e3d1ff87eb95d633804f3e215a344323699085096b5e832b3ae55dc
SHA512

875cb330fb155b77961f1d8075915764d9effa4bdfbae568feb39d622583552cb5fac8d8ed196f520e8d2b5dbe4d49d7fc23552d71d2eb5c9baa7aaccd5b5362
SSDEEP

6144:wJxMdy+42CUfNDDCLawEBa9CrxJCkOzzxeEpysla4+oybZU+g22zlcUfn/uTHqVw:huEUyHOFeEgslVblDzlcUux8crCcJ

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/2196-0-0x0000000000F6C000-0x0000000000FFF000-memory.dmp	family_expiro1
behavioral1/memory/2196-1-0x0000000000EF0000-0x0000000000FFF000-memory.dmp	family_expiro1
behavioral1/memory/2196-2-0x0000000000F6C000-0x0000000000FFF000-memory.dmp	family_expiro1
behavioral1/memory/2196-3-0x0000000000EF0000-0x0000000000FFF000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1908	2196	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_dc64fb891964a7694201dc450ccc7a4f.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2196 wrote to memory of 1908	2196	JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe	30
PID 2196 wrote to memory of 1908	2196	JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe	30
PID 2196 wrote to memory of 1908	2196	JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe	30
PID 2196 wrote to memory of 1908	2196	JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_dc64fb891964a7694201dc450ccc7a4f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2196
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2196 -s 132
  2⤵
  - Program crash
  PID:1908

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/2196-0-0x0000000000F6C000-0x0000000000FFF000-memory.dmp

Filesize
588KB

Download
memory/2196-1-0x0000000000EF0000-0x0000000000FFF000-memory.dmp

Filesize
1.1MB

Download
memory/2196-2-0x0000000000F6C000-0x0000000000FFF000-memory.dmp

Filesize
588KB

Download
memory/2196-3-0x0000000000EF0000-0x0000000000FFF000-memory.dmp

Filesize
1.1MB

Download