Overview

overview

10

Static

static

3

nurik.exe

windows10-ltsc 2021-x64

10

nurik.exe

windows11-21h2-x64

Analysis

  • max time kernel
    90s
  • max time network
    130s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241023-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    13-11-2024 12:55

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General

  • Target

    nurik.exe

  • Size

    333KB

  • MD5

    f6e15a4eba5f1bcfd4c60ad8c4b2f9b7

  • SHA1

    e929b611283987c4dc213b7ce786bb5762fbcaaf

  • SHA256

    bcd7b068992fb848fc3ba76021b3e095d0a0682c17146b4d836fa2a7846a2e0f

  • SHA512

    474c63a3dc03ddc3baf0463723ac991bd0cec08ebeaa64b867c91ae8624bbe37e1b1011e05f55ed7f1135f96931d654b243e8634d6dc367bd5ced05a6c1d7070

  • SSDEEP

    6144:ChCaXLv7nv96n5wmrHtU0wd9vKPoYYqUOiD:gbnFLUNeYYq7

Score
10/10
44caliberdiscoveryevasionexecutionpersistencespywarestealertrojan

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/1305967301434278000/MpR7whMC0XD8kaQy0et_dS_pJ52JmjXF1npMfUhwPeAHtnIp1OFwqC6MgKNDdiZUkC2k

Signatures

  • 44Caliber

    An open source infostealer written in C#.

    stealer44caliber
  • 44Caliber family
    44caliber
  • UAC bypass 3 TTPs 1 IoCs
    evasiontrojan
  • Windows security bypass 2 TTPs 2 IoCs
    evasiontrojan
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    execution
  • Event Triggered Execution: Image File Execution Options Injection 1 TTPs 12 IoCs
    persistence
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

    spywarestealer
  • Windows security modification 2 TTPs 3 IoCs
    evasiontrojan
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
    spyware
  • Adds Run key to start application 2 TTPs 3 IoCs
    persistence
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
    evasiontrojan
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 10 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Kills process with taskkill 5 IoCs
    evasion
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs
  • System policy modification 1 TTPs 3 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\nurik.exe
    "C:\Users\Admin\AppData\Local\Temp\nurik.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3600
    • C:\Windows\SysWOW64\TASKKILL.exe
      TASKKILL /F /IM wscript.exe
      2⤵
      • System Location Discovery: System Language Discovery
      • Kills process with taskkill
      • Suspicious use of AdjustPrivilegeToken
      PID:2188
    • C:\Windows\SysWOW64\TASKKILL.exe
      TASKKILL /F /IM cmd.exe
      2⤵
      • System Location Discovery: System Language Discovery
      • Kills process with taskkill
      • Suspicious use of AdjustPrivilegeToken
      PID:4140
    • C:\Windows\SysWOW64\taskkill.exe
      taskkill /f im Wireshark.exe
      2⤵
      • System Location Discovery: System Language Discovery
      • Kills process with taskkill
      PID:3536
    • C:\Windows\SysWOW64\schtasks.exe
      schtasks /delete /tn "MicrosoftEdgeUpdateTaskMachine" /f
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5024
    • C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /sc minute /mo 1 /tn "MicrosoftEdgeUpdateTaskMachine" /tr C:\Users\Admin\AppData\Local\Temp\nurik.exe
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:2680
    • C:\Users\Admin\AppData\Local\Temp\58680db91fd94468ada7410e69fede82.exe
      "C:\Users\Admin\AppData\Local\Temp\58680db91fd94468ada7410e69fede82.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2648
    • C:\Users\Admin\AppData\Local\Temp\2eec6748409f46a7b70b52317d0276c0.exe
      "C:\Users\Admin\AppData\Local\Temp\2eec6748409f46a7b70b52317d0276c0.exe"
      2⤵
      • UAC bypass
      • Windows security bypass
      • Event Triggered Execution: Image File Execution Options Injection
      • Checks computer location settings
      • Executes dropped EXE
      • Windows security modification
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:5056
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c schtasks /create /tn "GoogleUpdateTaskMachineUK" /sc MINUTE /mo 1 /tr "C:\Users\Admin\AppData\Local\Temp\2eec6748409f46a7b70b52317d0276c0.exe" /rl HIGHEST /f
        3⤵
          PID:456
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\2eec6748409f46a7b70b52317d0276c0.exe'"
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious use of AdjustPrivilegeToken
          PID:4480
    • C:\Windows\explorer.exe
      explorer.exe
      1⤵
        PID:3836
      • C:\Users\Admin\AppData\Local\Temp\nurik.exe
        "C:\Users\Admin\AppData\Local\Temp\nurik.exe"
        1⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3404
        • C:\Windows\SysWOW64\TASKKILL.exe
          TASKKILL /F /IM wscript.exe
          2⤵
          • System Location Discovery: System Language Discovery
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:3124
        • C:\Windows\SysWOW64\TASKKILL.exe
          TASKKILL /F /IM cmd.exe
          2⤵
          • System Location Discovery: System Language Discovery
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:1100

      Network

      MITRE ATT&CK Enterprise v15

      Reconnaissance

      Resource Development

      Initial Access

      Execution

      Command and Scripting Interpreter

      1
      T1059

      PowerShell

      1
      T1059.001

      Scheduled Task/Job

      1
      T1053

      Scheduled Task

      1
      T1053.005

      Persistence

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Event Triggered Execution

      1
      T1546

      Image File Execution Options Injection

      1
      T1546.012

      Scheduled Task/Job

      1
      T1053

      Scheduled Task

      1
      T1053.005

      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

      Event Triggered Execution

      1
      T1546

      Image File Execution Options Injection

      1
      T1546.012

      Scheduled Task/Job

      1
      T1053

      Scheduled Task

      1
      T1053.005

      Defense Evasion

      Abuse Elevation Control Mechanism

      1
      T1548

      Bypass User Account Control

      1
      T1548.002

      Impair Defenses

      3
      T1562

      Disable or Modify Tools

      3
      T1562.001

      Modify Registry

      5
      T1112

      Credential Access

      Credentials from Password Stores

      1
      T1555

      Credentials from Web Browsers

      1
      T1555.003

      Unsecured Credentials

      2
      T1552

      Credentials In Files

      2
      T1552.001

      Discovery

      Query Registry

      1
      T1012

      System Information Discovery

      3
      T1082

      System Location Discovery

      1
      T1614

      System Language Discovery

      1
      T1614.001

      Lateral Movement

      Collection

      Data from Local System

      2
      T1005

      Command and Control

      Web Service

      1
      T1102

      Exfiltration

      Impact

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\2eec6748409f46a7b70b52317d0276c0.exe
        Filesize

        529KB

        MD5

        d4a2e9c2470e0a8d6da5bf55a55af4c7

        SHA1

        c2d2b46c1647f9ee47c57e0e689e969a558ff38a

        SHA256

        0308f3e960c42d9cea793b31dd9b60c2a01c4892370575336d98ea42d2e91098

        SHA512

        51b3866504427dfcd57b1c27057585fd4a5c830bad92cefc23ff9d7dd20bb801bf66de1aa41b69c41e4e8699de6ef85955e1a712d1ffbaa7cab9161de87d8460

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\58680db91fd94468ada7410e69fede82.exe
        Filesize

        303KB

        MD5

        aa764022a5c1dbf958a8d56da1b01dcf

        SHA1

        fe0e02295ef1b692ed3362df9673c299b7d8f0e6

        SHA256

        1cec6d34cea21ccdecde482da26bcaba7304b04de8f14469993e242df81af019

        SHA512

        4eb7a6333b64137ead041d10ee8e47e5b3c5ffc13a9c595caf74357c6f8223810f3beab64bcb76c16c53a82d0d7ff75644796f561e2862f9be8f8e57df69275f

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_oubrkk4d.mod.ps1
        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        Download Submit

      • memory/2648-24-0x00000277C2D20000-0x00000277C2D72000-memory.dmp

        Filesize

        328KB

        Download

      • memory/2648-25-0x00000277DD390000-0x00000277DD48F000-memory.dmp

        Filesize

        1020KB

        Download

      • memory/3600-7-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-4-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-3-0x0000000074A62000-0x0000000074A63000-memory.dmp

        Filesize

        4KB

        Download

      • memory/3600-8-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-9-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-2-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-5-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-6-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-1-0x0000000074A60000-0x0000000075011000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/3600-0-0x0000000074A62000-0x0000000074A63000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4480-43-0x000001C10BE60000-0x000001C10BE82000-memory.dmp

        Filesize

        136KB

        Download

      • memory/5056-37-0x0000000000400000-0x00000000005C3000-memory.dmp

        Filesize

        1.8MB

        Download

      • memory/5056-68-0x0000000000400000-0x00000000005C3000-memory.dmp

        Filesize

        1.8MB

        Download

      • memory/5056-69-0x0000000000400000-0x00000000005C3000-memory.dmp

        Filesize

        1.8MB

        Download

      • memory/5056-90-0x0000000000400000-0x00000000005C3000-memory.dmp

        Filesize

        1.8MB

        Download