Overview

overview

10

Static

static

3

tmpkeezbcn2.exe

windows10-ltsc_2021-x64

10

tmpkeezbcn2.exe

windows10-2004-x64

10

tmpkeezbcn2.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    02/06/2026, 03:52

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General

  • Target
    tmpkeezbcn2.exe
  • Size 488KB
  • Sample260602-ee75bsew9p
  • SHA256 3a96625a5ed856e88d45f0ebd21c87b4096c3f2ef3e8fa151b6279f69075e179
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defense_evasiondiscoverypykspapersistenceprivilege_escalationtrojanworm

Malware Config

Signatures

  • Family: Pykspa

    Pykspa is a worm spreads via Skype uses DGA and it's written in C++.

    wormpykspa
  • Detect Pykspa worm 2 IoCs
    worm
  • Modifies WinLogon for persistence 2 TTPs 7 IoCs
    persistence
  • UAC bypass 3 TTPs 16 IoCs
    defense_evasiontrojan
  • Adds policy Run key to start application 2 TTPs 39 IoCs
    persistence
  • Disables RegEdit via registry modification 6 IoCs
    defense_evasion
  • Executes dropped EXE 28 IoCs
  • Impair Defenses: Safe Mode Boot 1 TTPs 6 IoCs
    defense_evasion
  • Adds Run key to start application 2 TTPs 64 IoCs
    persistence
  • Checks whether UAC is enabled 1 TTPs 14 IoCs
    defense_evasiontrojan
  • Hijack Execution Flow: Executable Installer File Permissions Weakness 1 TTPs 3 IoCs

    Possible Turn off User Account Control's privilege elevation for standard users.

    defense_evasionpersistenceprivilege_escalation
  • Looks up external IP address via web service 4 IoCs

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

  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 63 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 19 IoCs

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

    discovery
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs
  • System policy modification 1 TTPs 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpkeezbcn2.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpkeezbcn2.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:424
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\users\admin\appdata\local\temp\tmpkeezbcn2.exe*"
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Adds policy Run key to start application
      • Disables RegEdit via registry modification
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Hijack Execution Flow: Executable Installer File Permissions Weakness
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:1164
      • C:\Users\Admin\AppData\Local\Temp\ybkpq.exe
        "C:\Users\Admin\AppData\Local\Temp\ybkpq.exe" "-C:\Users\Admin\AppData\Local\Temp\vjdtfxofthwpsmkx.exe"
        3⤵
        • Modifies WinLogon for persistence
        • UAC bypass
        • Adds policy Run key to start application
        • Disables RegEdit via registry modification
        • Executes dropped EXE
        • Impair Defenses: Safe Mode Boot
        • Adds Run key to start application
        • Checks whether UAC is enabled
        • Hijack Execution Flow: Executable Installer File Permissions Weakness
        • Drops file in System32 directory
        • Drops file in Program Files directory
        • Drops file in Windows directory
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • System policy modification
        PID:1328
      • C:\Users\Admin\AppData\Local\Temp\ybkpq.exe
        "C:\Users\Admin\AppData\Local\Temp\ybkpq.exe" "-C:\Users\Admin\AppData\Local\Temp\vjdtfxofthwpsmkx.exe"
        3⤵
        • Modifies WinLogon for persistence
        • UAC bypass
        • Adds policy Run key to start application
        • Disables RegEdit via registry modification
        • Executes dropped EXE
        • Adds Run key to start application
        • Checks whether UAC is enabled
        • Hijack Execution Flow: Executable Installer File Permissions Weakness
        • Drops file in System32 directory
        • Drops file in Windows directory
        • System policy modification
        PID:1344
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\users\admin\appdata\local\temp\tmpkeezbcn2.exe"
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Adds policy Run key to start application
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:2960
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:5068
  • C:\Windows\wnkdsnhbsjbxdabrdya.exe
    wnkdsnhbsjbxdabrdya.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4972
  • C:\Windows\crmdqjbtixnhlgftd.exe
    crmdqjbtixnhlgftd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2456
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\crmdqjbtixnhlgftd.exe*."
      2⤵
      • Executes dropped EXE
      PID:2096
  • C:\Windows\yrqlczvrkdxvdcfxlimfe.exe
    yrqlczvrkdxvdcfxlimfe.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4016
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\yrqlczvrkdxvdcfxlimfe.exe*."
      2⤵
      • Executes dropped EXE
      PID:4084
  • C:\Users\Admin\AppData\Local\Temp\vjdtfxofthwpsmkx.exe
    C:\Users\Admin\AppData\Local\Temp\vjdtfxofthwpsmkx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:944
  • C:\Windows\vjdtfxofthwpsmkx.exe
    vjdtfxofthwpsmkx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4828
  • C:\Users\Admin\AppData\Local\Temp\wnkdsnhbsjbxdabrdya.exe
    C:\Users\Admin\AppData\Local\Temp\wnkdsnhbsjbxdabrdya.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2320
  • C:\Windows\wnkdsnhbsjbxdabrdya.exe
    wnkdsnhbsjbxdabrdya.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3068
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\wnkdsnhbsjbxdabrdya.exe*."
      2⤵
      • Executes dropped EXE
      PID:1960
  • C:\Windows\lbxpdxqjzpgbgccrcw.exe
    lbxpdxqjzpgbgccrcw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4616
  • C:\Windows\jbztjfavnfyvcactgcfx.exe
    jbztjfavnfyvcactgcfx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3372
  • C:\Windows\jbztjfavnfyvcactgcfx.exe
    jbztjfavnfyvcactgcfx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3384
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\jbztjfavnfyvcactgcfx.exe*."
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Adds policy Run key to start application
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:3032
  • C:\Users\Admin\AppData\Local\Temp\jbztjfavnfyvcactgcfx.exe
    C:\Users\Admin\AppData\Local\Temp\jbztjfavnfyvcactgcfx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1968
  • C:\Users\Admin\AppData\Local\Temp\lbxpdxqjzpgbgccrcw.exe
    C:\Users\Admin\AppData\Local\Temp\lbxpdxqjzpgbgccrcw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2176
  • C:\Users\Admin\AppData\Local\Temp\crmdqjbtixnhlgftd.exe
    C:\Users\Admin\AppData\Local\Temp\crmdqjbtixnhlgftd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:704
  • C:\Windows\vjdtfxofthwpsmkx.exe
    vjdtfxofthwpsmkx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2460
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\vjdtfxofthwpsmkx.exe*."
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Adds policy Run key to start application
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:1364
  • C:\Windows\crmdqjbtixnhlgftd.exe
    crmdqjbtixnhlgftd.exe
    1⤵
    • Executes dropped EXE
    PID:3772
  • C:\Users\Admin\AppData\Local\Temp\yrqlczvrkdxvdcfxlimfe.exe
    C:\Users\Admin\AppData\Local\Temp\yrqlczvrkdxvdcfxlimfe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2804
  • C:\Windows\lbxpdxqjzpgbgccrcw.exe
    lbxpdxqjzpgbgccrcw.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2684
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\lbxpdxqjzpgbgccrcw.exe*."
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Adds policy Run key to start application
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:4528
  • C:\Windows\yrqlczvrkdxvdcfxlimfe.exe
    yrqlczvrkdxvdcfxlimfe.exe
    1⤵
    • Executes dropped EXE
    PID:4908

Network

        MITRE ATT&CK Enterprise v16

        Reconnaissance

        Resource Development

        Initial Access

        Execution

        Persistence

        Boot or Logon Autostart Execution

        3
        T1547

        Registry Run Keys / Startup Folder

        2
        T1547.001

        Winlogon Helper DLL

        1
        T1547.004

        Hijack Execution Flow

        1
        T1574

        Executable Installer File Permissions Weakness

        1
        T1574.005

        Privilege Escalation

        Abuse Elevation Control Mechanism

        1
        T1548

        Bypass User Account Control

        1
        T1548.002

        Boot or Logon Autostart Execution

        3
        T1547

        Registry Run Keys / Startup Folder

        2
        T1547.001

        Winlogon Helper DLL

        1
        T1547.004

        Hijack Execution Flow

        1
        T1574

        Executable Installer File Permissions Weakness

        1
        T1574.005

        Defense Evasion

        Abuse Elevation Control Mechanism

        1
        T1548

        Bypass User Account Control

        1
        T1548.002

        Hijack Execution Flow

        1
        T1574

        Executable Installer File Permissions Weakness

        1
        T1574.005

        Impair Defenses

        2
        T1562

        Disable or Modify Tools

        1
        T1562.001

        Safe Mode Boot

        1
        T1562.009

        Modify Registry

        5
        T1112

        Credential Access

        Discovery

        System Information Discovery

        2
        T1082

        System Location Discovery

        1
        T1614

        System Language Discovery

        1
        T1614.001

        Lateral Movement

        Collection

        Command and Control

        Exfiltration

        Impact

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        nbzohptgxlj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
        • Size 320KB
        • SHA256 fa10ed2990ca760fb82fc16facf3d805f1a12ee3a8e5a723844cc1a0e3b88fcb
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ybkpq.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ybkpq.exe
        • Size 684KB
        • SHA256 5d335ef77ce5dc842950dca4890586ee085746ef9cbe31e0b9a3571791cb6ad7
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        axazuvvvspnpbelhzaifi.cdd
        • Path C:\Users\Admin\AppData\Local\axazuvvvspnpbelhzaifi.cdd
        • Size 268B
        • SHA256 b2d8b568204eb6050516dde70d6195b4144b02d28c5986f0af66bb93b4a6853d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        vdrbhtepxfobymeloatbpzfrcnvdmzwk.jmy
        • Path C:\Users\Admin\AppData\Local\vdrbhtepxfobymeloatbpzfrcnvdmzwk.jmy
        • Size 3KB
        • SHA256 d586f46f692df78deb033f9f9c27852223cfd9a73c3f48a5cee0f265fe5105f3
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        lbxpdxqjzpgbgccrcw.exe
        • Path C:\Windows\SysWOW64\lbxpdxqjzpgbgccrcw.exe
        • Size 488KB
        • SHA256 3a96625a5ed856e88d45f0ebd21c87b4096c3f2ef3e8fa151b6279f69075e179
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download