Overview

overview

10

Static

static

3

tmp_4np4l0y.exe

windows10-ltsc_2021-x64

10

tmp_4np4l0y.exe

windows10-2004-x64

10

tmp_4np4l0y.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    158s
  • 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, 03:45

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General

  • Target
    tmp_4np4l0y.exe
  • Size 472KB
  • Sample260602-ea546sew2r
  • SHA256 d87db55477a0f36b5c94e16d8f60ac79745be3d58cc77db6be405e8e4afb911c
  • 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 6 IoCs
    persistence
  • UAC bypass 3 TTPs 15 IoCs
    defense_evasiontrojan
  • Adds policy Run key to start application 2 TTPs 35 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 12 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 autorun.inf file 1 TTPs 4 IoCs

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

  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 56 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 18 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 42 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmp_4np4l0y.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp_4np4l0y.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1528
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\users\admin\appdata\local\temp\tmp_4np4l0y.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:3780
      • C:\Users\Admin\AppData\Local\Temp\hrzclr.exe
        "C:\Users\Admin\AppData\Local\Temp\hrzclr.exe" "-c:\users\admin\appdata\local\temp\tmp_4np4l0y.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 autorun.inf file
        • 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:968
      • C:\Users\Admin\AppData\Local\Temp\hrzclr.exe
        "C:\Users\Admin\AppData\Local\Temp\hrzclr.exe" "-c:\users\admin\appdata\local\temp\tmp_4np4l0y.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:4732
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\users\admin\appdata\local\temp\tmp_4np4l0y.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:2864
  • C:\Windows\wvskidtsisggoxhywpold.exe
    wvskidtsisggoxhywpold.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1592
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2188
  • C:\Users\Admin\AppData\Local\Temp\urmcyrfcqykiovdsofc.exe
    C:\Users\Admin\AppData\Local\Temp\urmcyrfcqykiovdsofc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2788
  • C:\Windows\hfbspjywluhgnveurjhd.exe
    hfbspjywluhgnveurjhd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1880
  • C:\Windows\jfzojbokxepmrxesnd.exe
    jfzojbokxepmrxesnd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2140
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\windows\jfzojbokxepmrxesnd.exe*."
      2⤵
      • Executes dropped EXE
      PID:3784
  • C:\Windows\urmcyrfcqykiovdsofc.exe
    urmcyrfcqykiovdsofc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3136
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\windows\urmcyrfcqykiovdsofc.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:4376
  • C:\Windows\tnfslbmgrwfadhmy.exe
    tnfslbmgrwfadhmy.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2892
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\windows\tnfslbmgrwfadhmy.exe*."
      2⤵
      • Executes dropped EXE
      PID:916
  • C:\Windows\avocwnzugmwswbhuo.exe
    avocwnzugmwswbhuo.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1872
  • C:\Users\Admin\AppData\Local\Temp\tnfslbmgrwfadhmy.exe
    C:\Users\Admin\AppData\Local\Temp\tnfslbmgrwfadhmy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4628
  • C:\Windows\urmcyrfcqykiovdsofc.exe
    urmcyrfcqykiovdsofc.exe
    1⤵
    • Executes dropped EXE
    PID:4420
  • C:\Windows\jfzojbokxepmrxesnd.exe
    jfzojbokxepmrxesnd.exe
    1⤵
    • Executes dropped EXE
    PID:1020
  • C:\Users\Admin\AppData\Local\Temp\hfbspjywluhgnveurjhd.exe
    C:\Users\Admin\AppData\Local\Temp\hfbspjywluhgnveurjhd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2152
  • C:\Windows\hfbspjywluhgnveurjhd.exe
    hfbspjywluhgnveurjhd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1668
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\windows\hfbspjywluhgnveurjhd.exe*."
      2⤵
      • Executes dropped EXE
      PID:384
  • C:\Windows\wvskidtsisggoxhywpold.exe
    wvskidtsisggoxhywpold.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4888
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\windows\wvskidtsisggoxhywpold.exe*."
      2⤵
      • Executes dropped EXE
      PID:1292
  • C:\Users\Admin\AppData\Local\Temp\wvskidtsisggoxhywpold.exe
    C:\Users\Admin\AppData\Local\Temp\wvskidtsisggoxhywpold.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2060
  • C:\Users\Admin\AppData\Local\Temp\avocwnzugmwswbhuo.exe
    C:\Users\Admin\AppData\Local\Temp\avocwnzugmwswbhuo.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4792
  • C:\Windows\avocwnzugmwswbhuo.exe
    avocwnzugmwswbhuo.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1740
    • C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
      "C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe" "c:\windows\avocwnzugmwswbhuo.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:5076
  • C:\Windows\tnfslbmgrwfadhmy.exe
    tnfslbmgrwfadhmy.exe
    1⤵
    • Executes dropped EXE
    PID:4736
  • C:\Users\Admin\AppData\Local\Temp\jfzojbokxepmrxesnd.exe
    C:\Users\Admin\AppData\Local\Temp\jfzojbokxepmrxesnd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2292

Network

        MITRE ATT&CK Enterprise v16

        Reconnaissance

        Resource Development

        Initial Access

        Replication Through Removable Media

        1
        T1091

        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

        Replication Through Removable Media

        1
        T1091

        Collection

        Command and Control

        Exfiltration

        Impact

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        gnssybzgewsaqhzyefmrrxayf.vrz
        • Path C:\Program Files (x86)\gnssybzgewsaqhzyefmrrxayf.vrz
        • Size 120B
        • SHA256 ca259c596e92705530bd47f40c5ab455768313e8084b1aa4d55579b8983a6299
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gnssybzgewsaqhzyefmrrxayf.vrz
        • Path C:\Program Files (x86)\gnssybzgewsaqhzyefmrrxayf.vrz
        • Size 120B
        • SHA256 04531a85d3332c7bd937fb12491c611862c97cfdc13095146289faa94b9879d5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gnssybzgewsaqhzyefmrrxayf.vrz
        • Path C:\Program Files (x86)\gnssybzgewsaqhzyefmrrxayf.vrz
        • Size 120B
        • SHA256 b2ae27a7000a5f52480a896f3a684d6468f6b84d38eb5b6705c5453544b3f4db
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gnssybzgewsaqhzyefmrrxayf.vrz
        • Path C:\Program Files (x86)\gnssybzgewsaqhzyefmrrxayf.vrz
        • Size 120B
        • SHA256 25d09c845835915ff0901a637bf1427fa4748a47631425438666efe7d3da94fd
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gnssybzgewsaqhzyefmrrxayf.vrz
        • Path C:\Program Files (x86)\gnssybzgewsaqhzyefmrrxayf.vrz
        • Size 120B
        • SHA256 d28c9ef50b4fa08b97d3dc2efecd98da85bffd090362b61f30d6da3305d29f1a
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        dhxvuubpnrh.exe
        • Path C:\Users\Admin\AppData\Local\Temp\dhxvuubpnrh.exe
        • Size 308KB
        • SHA256 6fff20aabe8265b6e811c9dbcb987f9c15cf07d1d8b80ced7b287d96900f5c62
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        hrzclr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\hrzclr.exe
        • Size 672KB
        • SHA256 30ab66f1fb21453f271d70045f09378954b748f150fbeb064072caa28c9ab469
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        gnssybzgewsaqhzyefmrrxayf.vrz
        • Path C:\Users\Admin\AppData\Local\gnssybzgewsaqhzyefmrrxayf.vrz
        • Size 120B
        • SHA256 2fdd7711422226c8c738c1c20ad01a72680cbf4ee268c6792ad647a7afd75778
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ldtevjsktwdwxzcmdphxiznwoxahabdgqhtl.mdr
        • Path C:\Users\Admin\AppData\Local\ldtevjsktwdwxzcmdphxiznwoxahabdgqhtl.mdr
        • Size 3KB
        • SHA256 b3efbc3f31395d28c7e0e362d776d56bbdf60a83f4c1fce15ba42f0430821c71
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        jfzojbokxepmrxesnd.exe
        • Path C:\Windows\SysWOW64\jfzojbokxepmrxesnd.exe
        • Size 472KB
        • SHA256 d87db55477a0f36b5c94e16d8f60ac79745be3d58cc77db6be405e8e4afb911c
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ufoscjl.bat
        • Path C:\ufoscjl.bat
        • Size 628KB
        • SHA256 ce1aac89d1df0aebe407047611391210a7fdfda9d3873c8a9c89fe9bebacff87
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download