Overview

overview

10

Static

static

3

tmpaczsrfhk.exe

windows10-ltsc_2021-x64

10

tmpaczsrfhk.exe

windows10-2004-x64

10

tmpaczsrfhk.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
    22/05/2026, 15:00

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General

  • Target
    tmpaczsrfhk.exe
  • Size 652KB
  • Sample260522-sdde8aey5m
  • SHA256 21cf2dbc94539534633514f66bbd96351456ce3c5e8a7da2bac76d4f84435b1f
  • 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 8 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 55 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\tmpaczsrfhk.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpaczsrfhk.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4068
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpaczsrfhk.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:4620
      • C:\Users\Admin\AppData\Local\Temp\hvxelt.exe
        "C:\Users\Admin\AppData\Local\Temp\hvxelt.exe" "-C:\Users\Admin\AppData\Local\Temp\trduldngziworwiw.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:4172
      • C:\Users\Admin\AppData\Local\Temp\hvxelt.exe
        "C:\Users\Admin\AppData\Local\Temp\hvxelt.exe" "-C:\Users\Admin\AppData\Local\Temp\trduldngziworwiw.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:5068
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpaczsrfhk.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:3040
  • C:\Windows\hjzuplzwtgyubkasuqdf.exe
    hjzuplzwtgyubkasuqdf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4188
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:3144
  • C:\Users\Admin\AppData\Local\Temp\wzqmifusqexucmdwzwkne.exe
    C:\Users\Admin\AppData\Local\Temp\wzqmifusqexucmdwzwkne.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3208
  • C:\Windows\hjzuplzwtgyubkasuqdf.exe
    hjzuplzwtgyubkasuqdf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1992
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\hjzuplzwtgyubkasuqdf.exe*."
      2⤵
      • Executes dropped EXE
      PID:3520
  • C:\Windows\trduldngziworwiw.exe
    trduldngziworwiw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2340
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\trduldngziworwiw.exe*."
      2⤵
      • Executes dropped EXE
      PID:3636
  • C:\Windows\uvkeytgcykbwckzqrmy.exe
    uvkeytgcykbwckzqrmy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4896
  • C:\Windows\trduldngziworwiw.exe
    trduldngziworwiw.exe
    1⤵
    • Executes dropped EXE
    PID:1256
  • C:\Windows\wzqmifusqexucmdwzwkne.exe
    wzqmifusqexucmdwzwkne.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:992
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\wzqmifusqexucmdwzwkne.exe*."
      2⤵
      • Executes dropped EXE
      PID:3656
  • C:\Windows\wzqmifusqexucmdwzwkne.exe
    wzqmifusqexucmdwzwkne.exe
    1⤵
    • Executes dropped EXE
    PID:4112
  • C:\Users\Admin\AppData\Local\Temp\jjxqjdpkfqgafmaqqk.exe
    C:\Users\Admin\AppData\Local\Temp\jjxqjdpkfqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4896
  • C:\Users\Admin\AppData\Local\Temp\trduldngziworwiw.exe
    C:\Users\Admin\AppData\Local\Temp\trduldngziworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:228
  • C:\Windows\uvkeytgcykbwckzqrmy.exe
    uvkeytgcykbwckzqrmy.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4480
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\uvkeytgcykbwckzqrmy.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:2524
  • C:\Windows\jjxqjdpkfqgafmaqqk.exe
    jjxqjdpkfqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4004
  • C:\Users\Admin\AppData\Local\Temp\uvkeytgcykbwckzqrmy.exe
    C:\Users\Admin\AppData\Local\Temp\uvkeytgcykbwckzqrmy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4356
  • C:\Windows\jjxqjdpkfqgafmaqqk.exe
    jjxqjdpkfqgafmaqqk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3276
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\jjxqjdpkfqgafmaqqk.exe*."
      2⤵
      • Executes dropped EXE
      PID:2816
  • C:\Users\Admin\AppData\Local\Temp\azmewpauoyngkqdsr.exe
    C:\Users\Admin\AppData\Local\Temp\azmewpauoyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4024
  • C:\Windows\azmewpauoyngkqdsr.exe
    azmewpauoyngkqdsr.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1852
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\azmewpauoyngkqdsr.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:3020
  • C:\Windows\azmewpauoyngkqdsr.exe
    azmewpauoyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    PID:3500
  • C:\Users\Admin\AppData\Local\Temp\hjzuplzwtgyubkasuqdf.exe
    C:\Users\Admin\AppData\Local\Temp\hjzuplzwtgyubkasuqdf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1132

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

        hvxelt.exe
        • Path C:\Users\Admin\AppData\Local\Temp\hvxelt.exe
        • Size 716KB
        • SHA256 3626792004845a3e112bfd9d7cc469d261aea4297c5526e0d32455e8da4d75c2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nayyfohuxki.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
        • Size 320KB
        • SHA256 34a5f9e2b494b086abad2721019be271fa43350c9146f000e50fe554f170743d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        grquydagmijoewvwhmitswafc.okl
        • Path C:\Users\Admin\AppData\Local\grquydagmijoewvwhmitswafc.okl
        • Size 260B
        • SHA256 cb5e3bb7a7348a5532295a7341301d5122dbd25c15e768ba0e91e60f501e783f
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        lhrgvltkbiukloykgwdzjyndlctamcdgqcyo.rbq
        • Path C:\Users\Admin\AppData\Local\lhrgvltkbiukloykgwdzjyndlctamcdgqcyo.rbq
        • Size 3KB
        • SHA256 715236c900128baf4e9548383e65e9c8f01bb7aaf2330dd798402d718f251b5f
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        jjxqjdpkfqgafmaqqk.exe
        • Path C:\Windows\SysWOW64\jjxqjdpkfqgafmaqqk.exe
        • Size 652KB
        • SHA256 21cf2dbc94539534633514f66bbd96351456ce3c5e8a7da2bac76d4f84435b1f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download