Overview

overview

10

Static

static

3

tmpjcstyod7.exe

windows10-ltsc_2021-x64

10

tmpjcstyod7.exe

windows10-2004-x64

10

tmpjcstyod7.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
    tmpjcstyod7.exe
  • Size 1016KB
  • Sample260522-sdkvashs2t
  • SHA256 8169b543d5eaadd434642a60da4ac0a1322c73865867afb583b2ca01aa2b7ec8
  • 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 36 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 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 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 42 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpjcstyod7.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpjcstyod7.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:560
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpjcstyod7.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:4416
      • C:\Users\Admin\AppData\Local\Temp\delkr.exe
        "C:\Users\Admin\AppData\Local\Temp\delkr.exe" "-C:\Users\Admin\AppData\Local\Temp\ameogyscqiworwiw.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:5088
      • C:\Users\Admin\AppData\Local\Temp\delkr.exe
        "C:\Users\Admin\AppData\Local\Temp\delkr.exe" "-C:\Users\Admin\AppData\Local\Temp\ameogyscqiworwiw.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:2912
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpjcstyod7.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:2384
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:3752
  • C:\Windows\oeaokgeskgyubkasuqka.exe
    oeaokgeskgyubkasuqka.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4492
  • C:\Windows\oeaokgeskgyubkasuqka.exe
    oeaokgeskgyubkasuqka.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1716
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\oeaokgeskgyubkasuqka.exe*."
      2⤵
      • Executes dropped EXE
      PID:2488
  • C:\Users\Admin\AppData\Local\Temp\qeykeyugwqgafmaqqk.exe
    C:\Users\Admin\AppData\Local\Temp\qeykeyugwqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1100
  • C:\Windows\qeykeyugwqgafmaqqk.exe
    qeykeyugwqgafmaqqk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3272
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\qeykeyugwqgafmaqqk.exe*."
      2⤵
      • Executes dropped EXE
      PID:1032
  • C:\Windows\ameogyscqiworwiw.exe
    ameogyscqiworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2820
  • C:\Users\Admin\AppData\Local\Temp\hunyrkfqfyngkqdsr.exe
    C:\Users\Admin\AppData\Local\Temp\hunyrkfqfyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3552
  • C:\Windows\hunyrkfqfyngkqdsr.exe
    hunyrkfqfyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2652
  • C:\Windows\durgdazohexucmdwzwrif.exe
    durgdazohexucmdwzwrif.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3772
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\durgdazohexucmdwzwrif.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:4084
  • C:\Windows\bqlytolypkbwckzqrmf.exe
    bqlytolypkbwckzqrmf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1844
  • C:\Windows\bqlytolypkbwckzqrmf.exe
    bqlytolypkbwckzqrmf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1932
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\bqlytolypkbwckzqrmf.exe*."
      2⤵
      • Executes dropped EXE
      PID:1492
  • C:\Windows\hunyrkfqfyngkqdsr.exe
    hunyrkfqfyngkqdsr.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1912
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\hunyrkfqfyngkqdsr.exe*."
      2⤵
      • Executes dropped EXE
      PID:3396
  • C:\Users\Admin\AppData\Local\Temp\oeaokgeskgyubkasuqka.exe
    C:\Users\Admin\AppData\Local\Temp\oeaokgeskgyubkasuqka.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4880
  • C:\Users\Admin\AppData\Local\Temp\ameogyscqiworwiw.exe
    C:\Users\Admin\AppData\Local\Temp\ameogyscqiworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3552
  • C:\Windows\durgdazohexucmdwzwrif.exe
    durgdazohexucmdwzwrif.exe
    1⤵
    • Executes dropped EXE
    PID:2532
  • C:\Users\Admin\AppData\Local\Temp\bqlytolypkbwckzqrmf.exe
    C:\Users\Admin\AppData\Local\Temp\bqlytolypkbwckzqrmf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2316
  • C:\Windows\ameogyscqiworwiw.exe
    ameogyscqiworwiw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1756
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\ameogyscqiworwiw.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:1672
  • C:\Windows\qeykeyugwqgafmaqqk.exe
    qeykeyugwqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    PID:3932
  • C:\Users\Admin\AppData\Local\Temp\durgdazohexucmdwzwrif.exe
    C:\Users\Admin\AppData\Local\Temp\durgdazohexucmdwzwrif.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:408

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

        fcfadglgfihkyolktwxuxsv.dyx
        • Path C:\Program Files (x86)\fcfadglgfihkyolktwxuxsv.dyx
        • Size 280B
        • SHA256 f1c3939ef0f99fa02c5860a54bbe700f67c0188ca838b0b8a1ce18a28dd54ab6
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fcfadglgfihkyolktwxuxsv.dyx
        • Path C:\Program Files (x86)\fcfadglgfihkyolktwxuxsv.dyx
        • Size 280B
        • SHA256 2bf8011786f906cb9b04bae51a3ab8c8025c02221557c318acc14b3cb57c3946
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        delkr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\delkr.exe
        • Size 704KB
        • SHA256 13b524f5db0d8e2e8fbf16536faca1df8bacde7aa86fc87899b66ccfe7cff9eb
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nayyfohuxki.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
        • Size 320KB
        • SHA256 78824051768030442a7943a8108ba943376e61fc08ca05827312342cf4648820
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fcfadglgfihkyolktwxuxsv.dyx
        • Path C:\Users\Admin\AppData\Local\fcfadglgfihkyolktwxuxsv.dyx
        • Size 280B
        • SHA256 129f5cc1830fb43a57b1be4c0875ff06127ac2a0918ca63305f4f29f63029521
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        saouiwmscqaonowgaoaiwcqeuakyiwvweo.wiq
        • Path C:\Users\Admin\AppData\Local\saouiwmscqaonowgaoaiwcqeuakyiwvweo.wiq
        • Size 4KB
        • SHA256 26c6410024f1abd187f236148aeebffcfe5071d50c00da84c0b4beb61e0a4578
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        qeykeyugwqgafmaqqk.exe
        • Path C:\Windows\SysWOW64\qeykeyugwqgafmaqqk.exe
        • Size 1016KB
        • SHA256 8169b543d5eaadd434642a60da4ac0a1322c73865867afb583b2ca01aa2b7ec8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download