Overview

overview

10

Static

static

3

tmpybvsv0s1.exe

windows10-ltsc_2021-x64

10

tmpybvsv0s1.exe

windows10-2004-x64

10

tmpybvsv0s1.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • 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, 02:44

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General

  • Target
    tmpybvsv0s1.exe
  • Size 548KB
  • Sample260602-c8a1kscs2s
  • SHA256 3a801906af230c0578e40c4ee18f2fe76ec90085acfc14c1fc95cb0b33b6ac54
  • 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 5 IoCs
    persistence
  • UAC bypass 3 TTPs 14 IoCs
    defense_evasiontrojan
  • Adds policy Run key to start application 2 TTPs 30 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 10 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 39 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 39 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 40 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpybvsv0s1.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpybvsv0s1.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3396
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\users\admin\appdata\local\temp\tmpybvsv0s1.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:4056
      • C:\Users\Admin\AppData\Local\Temp\yioqvkj.exe
        "C:\Users\Admin\AppData\Local\Temp\yioqvkj.exe" "-C:\Users\Admin\AppData\Local\Temp\xqfqeckhxjutdwzj.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:588
      • C:\Users\Admin\AppData\Local\Temp\yioqvkj.exe
        "C:\Users\Admin\AppData\Local\Temp\yioqvkj.exe" "-C:\Users\Admin\AppData\Local\Temp\xqfqeckhxjutdwzj.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:2876
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\users\admin\appdata\local\temp\tmpybvsv0s1.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:3500
  • C:\Windows\nizmccmldrefrmrdyx.exe
    nizmccmldrefrmrdyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4796
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:5116
  • C:\Users\Admin\AppData\Local\Temp\libqikwxrhwznkrfcdhe.exe
    C:\Users\Admin\AppData\Local\Temp\libqikwxrhwznkrfcdhe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2636
  • C:\Windows\aysibertofvzomujhjomg.exe
    aysibertofvzomujhjomg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1812
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\aysibertofvzomujhjomg.exe*."
      2⤵
      • Executes dropped EXE
      PID:4548
  • C:\Windows\libqikwxrhwznkrfcdhe.exe
    libqikwxrhwznkrfcdhe.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4452
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\libqikwxrhwznkrfcdhe.exe*."
      2⤵
      • Executes dropped EXE
      PID:4608
  • C:\Windows\aysibertofvzomujhjomg.exe
    aysibertofvzomujhjomg.exe
    1⤵
    • Executes dropped EXE
    PID:1580
  • C:\Users\Admin\AppData\Local\Temp\yumarsddwlzbokqdzzc.exe
    C:\Users\Admin\AppData\Local\Temp\yumarsddwlzbokqdzzc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:972
  • C:\Windows\eyoapoxvmzllwqufz.exe
    eyoapoxvmzllwqufz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4656
  • C:\Windows\yumarsddwlzbokqdzzc.exe
    yumarsddwlzbokqdzzc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4348
  • C:\Windows\yumarsddwlzbokqdzzc.exe
    yumarsddwlzbokqdzzc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2368
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\yumarsddwlzbokqdzzc.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:3468
  • C:\Windows\eyoapoxvmzllwqufz.exe
    eyoapoxvmzllwqufz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3100
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\eyoapoxvmzllwqufz.exe*."
      2⤵
      • Executes dropped EXE
      PID:3408
  • C:\Users\Admin\AppData\Local\Temp\aysibertofvzomujhjomg.exe
    C:\Users\Admin\AppData\Local\Temp\aysibertofvzomujhjomg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4284
  • C:\Users\Admin\AppData\Local\Temp\nizmccmldrefrmrdyx.exe
    C:\Users\Admin\AppData\Local\Temp\nizmccmldrefrmrdyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4064
  • C:\Windows\xqfqeckhxjutdwzj.exe
    xqfqeckhxjutdwzj.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4540
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\xqfqeckhxjutdwzj.exe*."
      2⤵
      • Executes dropped EXE
      PID:4060
  • C:\Windows\xqfqeckhxjutdwzj.exe
    xqfqeckhxjutdwzj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4528
  • C:\Windows\nizmccmldrefrmrdyx.exe
    nizmccmldrefrmrdyx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2496
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\nizmccmldrefrmrdyx.exe*."
      2⤵
      • Executes dropped EXE
      PID:4792
  • C:\Users\Admin\AppData\Local\Temp\eyoapoxvmzllwqufz.exe
    C:\Users\Admin\AppData\Local\Temp\eyoapoxvmzllwqufz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2116
  • C:\Users\Admin\AppData\Local\Temp\xqfqeckhxjutdwzj.exe
    C:\Users\Admin\AppData\Local\Temp\xqfqeckhxjutdwzj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1816
  • C:\Windows\libqikwxrhwznkrfcdhe.exe
    libqikwxrhwznkrfcdhe.exe
    1⤵
    • Executes dropped EXE
    PID:4496

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

        lfkywbphvpu.exe
        • Path C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
        • Size 320KB
        • SHA256 f248edf186e40dcaa1f6dc14ace76980453cb945afe33c39223bdd1f9a9a9be6
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        yioqvkj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\yioqvkj.exe
        • Size 716KB
        • SHA256 b650b7d24e37467a825c4f37169857a1f22ec5e8a2db35e6c1233c69e91554da
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        bedywewddzudxanhkrbedy.ewd
        • Path C:\Users\Admin\AppData\Local\bedywewddzudxanhkrbedy.ewd
        • Size 280B
        • SHA256 8ee20be2d18032bb65dd2c8ae2e485aca22bc0190e9aab8ec24cead0b7c3b121
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        sgqwfybtelrlqechvniwgmvorjubhbgus.ldy
        • Path C:\Users\Admin\AppData\Local\sgqwfybtelrlqechvniwgmvorjubhbgus.ldy
        • Size 4KB
        • SHA256 f746875324216bd7c70898222fb0a3e5a063ccf3b1f121a83f87383eeeb1e4e4
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nizmccmldrefrmrdyx.exe
        • Path C:\Windows\SysWOW64\nizmccmldrefrmrdyx.exe
        • Size 548KB
        • SHA256 3a801906af230c0578e40c4ee18f2fe76ec90085acfc14c1fc95cb0b33b6ac54
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download