Overview

overview

10

Static

static

3

tmptxf3sp01.exe

windows10-ltsc_2021-x64

10

tmptxf3sp01.exe

windows10-2004-x64

10

tmptxf3sp01.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    02/06/2026, 02:43

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General

  • Target
    tmptxf3sp01.exe
  • Size 1016KB
  • Sample260602-c7pgksdv4l
  • SHA256 838b5dac39dcd84b714969960bf3809f9fe66c8ac63195441824808511d80687
  • 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
  • Checks computer location settings 2 TTPs 8 IoCs

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

  • 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 9 IoCs

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

  • Drops file in System32 directory 46 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 46 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 17 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\tmptxf3sp01.exe
    "C:\Users\Admin\AppData\Local\Temp\tmptxf3sp01.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1788
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmptxf3sp01.exe*"
      2⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Adds policy Run key to start application
      • Disables RegEdit via registry modification
      • Checks computer location settings
      • 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:2904
      • C:\Users\Admin\AppData\Local\Temp\ehhty.exe
        "C:\Users\Admin\AppData\Local\Temp\ehhty.exe" "-C:\Users\Admin\AppData\Local\Temp\bpaxnwlitiworwiw.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:5020
      • C:\Users\Admin\AppData\Local\Temp\ehhty.exe
        "C:\Users\Admin\AppData\Local\Temp\ehhty.exe" "-C:\Users\Admin\AppData\Local\Temp\bpaxnwlitiworwiw.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:384
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmptxf3sp01.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:1492
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4884
  • C:\Windows\rhutlwnmzqgafmaqqk.exe
    rhutlwnmzqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1312
  • C:\Windows\ixjhyiywiyngkqdsr.exe
    ixjhyiywiyngkqdsr.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5072
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\ixjhyiywiyngkqdsr.exe*."
      2⤵
      • Executes dropped EXE
      PID:3112
  • C:\Users\Admin\AppData\Local\Temp\ixjhyiywiyngkqdsr.exe
    C:\Users\Admin\AppData\Local\Temp\ixjhyiywiyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3000
  • C:\Users\Admin\AppData\Local\Temp\cthhameeskbwckzqrmg.exe
    C:\Users\Admin\AppData\Local\Temp\cthhameeskbwckzqrmg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2520
  • C:\Windows\cthhameeskbwckzqrmg.exe
    cthhameeskbwckzqrmg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4388
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\cthhameeskbwckzqrmg.exe*."
      2⤵
      • Executes dropped EXE
      PID:3780
  • C:\Windows\exnpkysukexucmdwzwslb.exe
    exnpkysukexucmdwzwslb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2272
  • C:\Windows\rhutlwnmzqgafmaqqk.exe
    rhutlwnmzqgafmaqqk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4064
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\rhutlwnmzqgafmaqqk.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:3544
  • C:\Windows\cthhameeskbwckzqrmg.exe
    cthhameeskbwckzqrmg.exe
    1⤵
    • Executes dropped EXE
    PID:5100
  • C:\Users\Admin\AppData\Local\Temp\exnpkysukexucmdwzwslb.exe
    C:\Users\Admin\AppData\Local\Temp\exnpkysukexucmdwzwslb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1956
  • C:\Windows\bpaxnwlitiworwiw.exe
    bpaxnwlitiworwiw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4984
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\bpaxnwlitiworwiw.exe*."
      2⤵
      • Executes dropped EXE
      PID:2624
  • C:\Users\Admin\AppData\Local\Temp\rhutlwnmzqgafmaqqk.exe
    C:\Users\Admin\AppData\Local\Temp\rhutlwnmzqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4160
  • C:\Windows\bpaxnwlitiworwiw.exe
    bpaxnwlitiworwiw.exe
    1⤵
    • Executes dropped EXE
    PID:608
  • C:\Windows\exnpkysukexucmdwzwslb.exe
    exnpkysukexucmdwzwslb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3804
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\exnpkysukexucmdwzwslb.exe*."
      2⤵
      • Executes dropped EXE
      PID:2268
  • C:\Windows\ixjhyiywiyngkqdsr.exe
    ixjhyiywiyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    PID:4120
  • C:\Users\Admin\AppData\Local\Temp\bpaxnwlitiworwiw.exe
    C:\Users\Admin\AppData\Local\Temp\bpaxnwlitiworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1884
  • C:\Windows\phwxrexyngyubkasuqld.exe
    phwxrexyngyubkasuqld.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1056
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\phwxrexyngyubkasuqld.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:3720
  • C:\Users\Admin\AppData\Local\Temp\phwxrexyngyubkasuqld.exe
    C:\Users\Admin\AppData\Local\Temp\phwxrexyngyubkasuqld.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2200
  • C:\Windows\phwxrexyngyubkasuqld.exe
    phwxrexyngyubkasuqld.exe
    1⤵
    • Executes dropped EXE
    PID:2268

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

        Query Registry

        1
        T1012

        System Information Discovery

        3
        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

        ehhty.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ehhty.exe
        • Size 716KB
        • SHA256 0711b030f11e41eaf5bb9f103e793446979d05e173c45b1d5c7aac0aaada9072
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nayyfohuxki.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
        • Size 320KB
        • SHA256 67b95279fe115d518b5e7f7eb51420ab6f9e0d182bf5ebb2f1c5cf1b43a7b5e7
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        jjgprmnwtuuyneccmqttqzbw.gde
        • Path C:\Users\Admin\AppData\Local\jjgprmnwtuuyneccmqttqzbw.gde
        • Size 280B
        • SHA256 1a3b67055aea79d313a761b5310f1786164ccbbd7de84d1867c4076a2baab3a5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        sdlfsykemyjyyajupesdlfsykemyjyyajup.sdl
        • Path C:\Users\Admin\AppData\Local\sdlfsykemyjyyajupesdlfsykemyjyyajup.sdl
        • Size 4KB
        • SHA256 e95abad08bfcdfd17b737c2674052124ad7e078d5a9535d48f34b172853edb95
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        rhutlwnmzqgafmaqqk.exe
        • Path C:\Windows\SysWOW64\rhutlwnmzqgafmaqqk.exe
        • Size 1016KB
        • SHA256 838b5dac39dcd84b714969960bf3809f9fe66c8ac63195441824808511d80687
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download