Overview

overview

10

Static

static

3

2026-08-27...ck.exe

windows10-2004-x64

10

2026-08-27...ck.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    2026-08-27_a7cf1586d91771081a96c84fba745377_elex_virlock
  • Size 4.0MB
  • Sample260827-m482xshc58
  • SHA256 9f22cd6751cb82d01e5c6b163cc4c9ca87d958b90a77c0e99ec5c6f0a00566ec
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
nabucurdefense_evasiondiscoveryexecutionpersistenceransomwarespywarestealertrojan

Malware Config

Targets

    • Target
      2026-08-27_a7cf1586d91771081a96c84fba745377_elex_virlock
    • Size 4.0MB
    • SHA256 9f22cd6751cb82d01e5c6b163cc4c9ca87d958b90a77c0e99ec5c6f0a00566ec
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defense_evasiondiscoveryexecutionnabucurpersistenceransomwarespywarestealertrojan

    • Family: Nabucur

      Nabucur is a ransomware first seen in 2015.

      ransomwarenabucur

    • Modifies visibility of file extensions in Explorer

      defense_evasion

    • UAC bypass

      defense_evasiontrojan
    • Custom signature

      Detects executables containing URLs to raw contents of a Github gist

    • Custom signature

      Detects executables embedding registry key / value combination indicative of disabling Windows Defen

    • Renames multiple (189) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

      ransomware

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

      spywarestealer

    • Adds Run key to start application

      persistence

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

Windows Command Shell

1
T1059.003

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Hide Artifacts

1
T1564

Hidden Files and Directories

1
T1564.001

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Modify Registry

4
T1112

Credential Access

Credentials from Password Stores

1
T1555

Credentials from Web Browsers

1
T1555.003

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Data from Local System

1
T1005

Command and Control

Exfiltration

Impact

Tasks