Overview

overview

10

Static

static

10

Bootstrapper.exe

windows7-x64

Bootstrapper.exe

windows10-2004-x64

Analysis

  • max time kernel
    72s
  • max time network
    74s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    10-11-2024 19:59

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Errors

Reason
Machine shutdown
Report Analysis Logs

General

  • Target

    Bootstrapper.exe

  • Size

    37KB

  • MD5

    e08d7967557238a0ee488e405f7865dd

  • SHA1

    b4428239dff65be117076a6d2169c1f5488e098e

  • SHA256

    3ba9088ef4662608ccdb45a1333d4a5c9970fa90acdfdff4787233b8e4aa23d4

  • SHA512

    f9d197250afbdffb9d7081f87b94687d1cd7d53f7901e0b402444f5e8f9c9df76b8b1ff25d44246231468de3a13bfa5b0d61755bd341bac191bef7ba0d51da81

  • SSDEEP

    384:71/yi00nCVpd3vVmyhKrrvFcCRYc2/efurAF+rMRTyN/0L+EcoinblneHQM3epzR:xHANVdhKr7FcRB/eWrM+rMRa8NuGItN

Score
10/10
njratkrasus-pcdiscoveryevasionpersistenceprivilege_escalationtrojan

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

Krasus-Pc

C2

mingrelian.duckdns.org:4444

Mutex

cf0442d73ab4fa4b3573bef8feb3ee75

Attributes
  • reg_key

    cf0442d73ab4fa4b3573bef8feb3ee75

  • splitter

    |'|'|

Signatures

  • Njrat family
    njrat
  • njRAT/Bladabindi

    Widely used RAT written in .NET.

    trojannjrat
  • Modifies Windows Firewall 2 TTPs 1 IoCs
    evasion
  • Drops startup file 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Drops autorun.inf file 1 TTPs 5 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • Enumerates physical storage devices 1 TTPs

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

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

    persistenceprivilege_escalation
  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

    discovery
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 15 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe
    "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
    1⤵
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1036
    • C:\Users\Admin\RtkAudioService64.exe
      "C:\Users\Admin\RtkAudioService64.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops autorun.inf file
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2520
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall add allowedprogram "C:\Users\Admin\RtkAudioService64.exe" "RtkAudioService64.exe" ENABLE
        3⤵
        • Modifies Windows Firewall
        • Event Triggered Execution: Netsh Helper DLL
        • System Location Discovery: System Language Discovery
        PID:3012
  • C:\Windows\system32\LogonUI.exe
    "LogonUI.exe" /flags:0x0
    1⤵
      PID:2868
    • C:\Windows\system32\LogonUI.exe
      "LogonUI.exe" /flags:0x1
      1⤵
        PID:1784

      Network

      MITRE ATT&CK Enterprise v15

      Reconnaissance

      Resource Development

      Initial Access

      Replication Through Removable Media

      1
      T1091

      Execution

      Persistence

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Create or Modify System Process

      1
      T1543

      Windows Service

      1
      T1543.003

      Event Triggered Execution

      1
      T1546

      Netsh Helper DLL

      1
      T1546.007

      Privilege Escalation

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Create or Modify System Process

      1
      T1543

      Windows Service

      1
      T1543.003

      Event Triggered Execution

      1
      T1546

      Netsh Helper DLL

      1
      T1546.007

      Defense Evasion

      Impair Defenses

      1
      T1562

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      1
      T1112

      Credential Access

      Discovery

      System Information Discovery

      1
      T1082

      System Location Discovery

      1
      T1614

      System Language Discovery

      1
      T1614.001

      Lateral Movement

      Replication Through Removable Media

      1
      T1091

      Collection

      Command and Control

      Exfiltration

      Impact

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\RtkAudioService64.exe
        Filesize

        37KB

        MD5

        e08d7967557238a0ee488e405f7865dd

        SHA1

        b4428239dff65be117076a6d2169c1f5488e098e

        SHA256

        3ba9088ef4662608ccdb45a1333d4a5c9970fa90acdfdff4787233b8e4aa23d4

        SHA512

        f9d197250afbdffb9d7081f87b94687d1cd7d53f7901e0b402444f5e8f9c9df76b8b1ff25d44246231468de3a13bfa5b0d61755bd341bac191bef7ba0d51da81

        Download Submit

      • memory/1036-0-0x0000000074FC1000-0x0000000074FC2000-memory.dmp

        Filesize

        4KB

        Download

      • memory/1036-1-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/1036-2-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/1036-10-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/2520-11-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/2520-12-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/2520-22-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download

      • memory/2520-23-0x0000000074FC0000-0x000000007556B000-memory.dmp

        Filesize

        5.7MB

        Download