Overview

overview

10

Static

static

10

Servers.exe

windows10-1703-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    140s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    04-10-2024 21:29

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General

  • Target

    Servers.exe

  • Size

    37KB

  • MD5

    5665a0ef3c4a6150e10b869fb59ad941

  • SHA1

    7fa2df340c220f3ecab70ad373110a1c23edadc0

  • SHA256

    4c51c9c2122e58bf806674edddf1c75d752b7b9eb8fce8113a5d35ee503dda96

  • SHA512

    d5733d3547fed591eb3aff392877789a71814681fd98796441a1d587be7b8a5e2bbc199d2a4956706890de4031538a2d33333f0f58424f8e7bda1775f11fb590

  • SSDEEP

    768:bNj8nAwJvtPrbAEgC4OrM+rMRa8NuA4t:bNwAwJ1DUEmR+gRJNH

Score
10/10
njratboykisserdiscoveryevasionpersistenceprivilege_escalationtrojan

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

boykisser

C2

ground-heavily.gl.at.ply.gg:5552

Mutex

3d5ac8ba8f05dd1075b6413d77ad5960

Attributes
  • reg_key

    3d5ac8ba8f05dd1075b6413d77ad5960

  • splitter

    |'|'|

Signatures

  • 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
  • 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.

  • Drops file in Windows directory 2 IoCs
  • 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 4 IoCs

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

    discovery
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Kills process with taskkill 1 IoCs
    evasion
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 39 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Servers.exe
    "C:\Users\Admin\AppData\Local\Temp\Servers.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4964
    • C:\ProgramData\COM Surrogate.exe
      "C:\ProgramData\COM Surrogate.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:432
      • C:\Windows\SysWOW64\netsh.exe
        netsh firewall add allowedprogram "C:\ProgramData\COM Surrogate.exe" "COM Surrogate.exe" ENABLE
        3⤵
        • Modifies Windows Firewall
        • Event Triggered Execution: Netsh Helper DLL
        • System Location Discovery: System Language Discovery
        PID:1772
      • C:\Windows\SysWOW64\taskkill.exe
        taskkill /F /IM SecHealthUI.exe
        3⤵
        • System Location Discovery: System Language Discovery
        • Kills process with taskkill
        • Suspicious use of AdjustPrivilegeToken
        PID:3984
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /4
    1⤵
    • Drops file in Windows directory
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:200

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

Peripheral Device Discovery

1
T1120

Query Registry

1
T1012

System Information Discovery

2
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

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Downloads

  • C:\ProgramData\COM Surrogate.exe
    Filesize

    37KB

    MD5

    5665a0ef3c4a6150e10b869fb59ad941

    SHA1

    7fa2df340c220f3ecab70ad373110a1c23edadc0

    SHA256

    4c51c9c2122e58bf806674edddf1c75d752b7b9eb8fce8113a5d35ee503dda96

    SHA512

    d5733d3547fed591eb3aff392877789a71814681fd98796441a1d587be7b8a5e2bbc199d2a4956706890de4031538a2d33333f0f58424f8e7bda1775f11fb590

    Download Submit

  • memory/4964-0-0x0000000073161000-0x0000000073162000-memory.dmp

    Filesize

    4KB

    Download

  • memory/4964-1-0x0000000073160000-0x0000000073710000-memory.dmp

    Filesize

    5.7MB

    Download

  • memory/4964-2-0x0000000073160000-0x0000000073710000-memory.dmp

    Filesize

    5.7MB

    Download

  • memory/4964-16-0x0000000073160000-0x0000000073710000-memory.dmp

    Filesize

    5.7MB

    Download