71358d729b01bdf38dbe5440705ea68ea9225f93c834f45c5687b0ea2b417c4e

Analysis

user interaction
yes
max time kernel
90s
max time network
36s
platform
windows11-21h2_x64
resource
win11-20260911-en
resource tags

arch:x64arch:x86image:win11-20260911-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
19/09/2026, 16:07

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General

Target
ucrtbase.dll
Size 1.1MB
Sample260919-tk599adn2w
SHA256 71358d729b01bdf38dbe5440705ea68ea9225f93c834f45c5687b0ea2b417c4e
MD5 d4cf3fd5e8ee95431cfea69fa84ae57d
SHA1 80f5188570001e4fd5fdad9cbf38479dd4edd255
SHA512 a30488c43ca41ed36ee2917fe8e7a5280e0565859f719a1f709b13c18c3398f323c8ef24608e8f696214d9fe882c32b1a8686800490ca781196810220b30d43b
SSDEEP 24576:YWisOihSAdUDRdwE0OpuE4N7qWkGA+g7lyD6ZQtpmcvIZPoy4cncF4dN:zisOihSlDZuNN7qLZyD6yt6nccN
TLSH
T1B6453A093585E0AEDC6D3679136BB522346C76924BA8ECC373840BE98E305D17736EDB
MD5 SHA1 SHA512 SSDEEP TLSH

Score

3^/10

discovery

Malware Config

Signatures

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	rundll32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 5832 wrote to memory of 5804	5832	rundll32.exe	82

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\ucrtbase.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:5832
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\ucrtbase.dll,#1
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5804

Network

MITRE ATT&CK Enterprise v16

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

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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