Overview

overview

10

Static

static

3

tmpcbmiutzz.exe

windows10-ltsc_2021-x64

10

tmpcbmiutzz.exe

windows10-2004-x64

10

tmpcbmiutzz.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • 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, 02:57

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General

  • Target
    tmpcbmiutzz.exe
  • Size 780KB
  • Sample260602-dfrcjadx3k
  • SHA256 add220d07c526439d1a3c7dff09f188330ee7150fe5ba33dac753e2ff396d796
  • 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 34 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 autorun.inf file 1 TTPs 4 IoCs

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

  • 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\tmpcbmiutzz.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpcbmiutzz.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2092
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\users\admin\appdata\local\temp\tmpcbmiutzz.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:5028
      • C:\Users\Admin\AppData\Local\Temp\ydkky.exe
        "C:\Users\Admin\AppData\Local\Temp\ydkky.exe" "-C:\Users\Admin\AppData\Local\Temp\vldonbkfrhvvlibq.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:2588
      • C:\Users\Admin\AppData\Local\Temp\ydkky.exe
        "C:\Users\Admin\AppData\Local\Temp\ydkky.exe" "-C:\Users\Admin\AppData\Local\Temp\vldonbkfrhvvlibq.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:4500
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\users\admin\appdata\local\temp\tmpcbmiutzz.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:1456
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2172
  • C:\Windows\ytqgkdrridwbwywqrcmhe.exe
    ytqgkdrridwbwywqrcmhe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4016
  • C:\Windows\ldxklbmjxpfhzytkiq.exe
    ldxklbmjxpfhzytkiq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4708
  • C:\Windows\ldxklbmjxpfhzytkiq.exe
    ldxklbmjxpfhzytkiq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2324
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\ldxklbmjxpfhzytkiq.exe*."
      2⤵
      • Executes dropped EXE
      PID:4652
  • C:\Windows\vldonbkfrhvvlibq.exe
    vldonbkfrhvvlibq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4620
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\vldonbkfrhvvlibq.exe*."
      2⤵
      • Executes dropped EXE
      PID:4940
  • C:\Users\Admin\AppData\Local\Temp\ldxklbmjxpfhzytkiq.exe
    C:\Users\Admin\AppData\Local\Temp\ldxklbmjxpfhzytkiq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3444
  • C:\Users\Admin\AppData\Local\Temp\jdzorjwvlfxbvwtmmwfz.exe
    C:\Users\Admin\AppData\Local\Temp\jdzorjwvlfxbvwtmmwfz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3232
  • C:\Windows\wpkyardbqjadwwskjsa.exe
    wpkyardbqjadwwskjsa.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1512
  • C:\Windows\wpkyardbqjadwwskjsa.exe
    wpkyardbqjadwwskjsa.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2504
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\wpkyardbqjadwwskjsa.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:\Users\Admin\AppData\Local\Temp\vldonbkfrhvvlibq.exe
    C:\Users\Admin\AppData\Local\Temp\vldonbkfrhvvlibq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2464
  • C:\Users\Admin\AppData\Local\Temp\wpkyardbqjadwwskjsa.exe
    C:\Users\Admin\AppData\Local\Temp\wpkyardbqjadwwskjsa.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3852
  • C:\Windows\vldonbkfrhvvlibq.exe
    vldonbkfrhvvlibq.exe
    1⤵
    • Executes dropped EXE
    PID:4612
  • C:\Windows\jdzorjwvlfxbvwtmmwfz.exe
    jdzorjwvlfxbvwtmmwfz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3272
  • C:\Windows\jdzorjwvlfxbvwtmmwfz.exe
    jdzorjwvlfxbvwtmmwfz.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3536
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\jdzorjwvlfxbvwtmmwfz.exe*."
      2⤵
      • Executes dropped EXE
      PID:3972
  • C:\Users\Admin\AppData\Local\Temp\ytqgkdrridwbwywqrcmhe.exe
    C:\Users\Admin\AppData\Local\Temp\ytqgkdrridwbwywqrcmhe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3500
  • C:\Windows\ctmyynxtgxmnecwmj.exe
    ctmyynxtgxmnecwmj.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5024
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\ctmyynxtgxmnecwmj.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:868
  • C:\Windows\ytqgkdrridwbwywqrcmhe.exe
    ytqgkdrridwbwywqrcmhe.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2860
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\ytqgkdrridwbwywqrcmhe.exe*."
      2⤵
      • Executes dropped EXE
      PID:1516
  • C:\Users\Admin\AppData\Local\Temp\ctmyynxtgxmnecwmj.exe
    C:\Users\Admin\AppData\Local\Temp\ctmyynxtgxmnecwmj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4788
  • C:\Windows\ctmyynxtgxmnecwmj.exe
    ctmyynxtgxmnecwmj.exe
    1⤵
    • Executes dropped EXE
    PID:3780

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

        Query Registry

        1
        T1012

        System Information Discovery

        3
        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

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        Downloads

        dfjgrrmtrttfhqvwewnptqbb.dbd
        • Path C:\Program Files (x86)\dfjgrrmtrttfhqvwewnptqbb.dbd
        • Size 280B
        • SHA256 ffa3c017abf0ee9796e6d2ca1ce9c22d1c20c4a5047f2f356b1b970edc9a3c55
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mhskyizawrc.exe
        • Path C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
        • Size 320KB
        • SHA256 996892712635caa8953b0d470fb35e26f253fed770581eea3424c6e4e9ede857
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ydkky.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ydkky.exe
        • Size 716KB
        • SHA256 4b348dae975cf496087f5c9031a10c046bc65e52dc9ef07c4dd176e1d0e89b5e
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        dfjgrrmtrttfhqvwewnptqbb.dbd
        • Path C:\Users\Admin\AppData\Local\dfjgrrmtrttfhqvwewnptqbb.dbd
        • Size 280B
        • SHA256 76169907350de48f3095ff6c6be2094a848f2f9660b750b1b8b178e02afeb021
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        dfjgrrmtrttfhqvwewnptqbb.dbd
        • Path C:\Users\Admin\AppData\Local\dfjgrrmtrttfhqvwewnptqbb.dbd
        • Size 280B
        • SHA256 77c39cff3cc63d1ba01a986f2a89dc86d2473777590c788a517331125a1c1295
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mzowsdjbkxifsmcohkmzowsdjbkxifsmcoh.mzo
        • Path C:\Users\Admin\AppData\Local\mzowsdjbkxifsmcohkmzowsdjbkxifsmcoh.mzo
        • Size 4KB
        • SHA256 39b6db2a0d608c42ce877601e20442c9c45e54356e9fa0a0a49e99bc3049bbdd
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ldxklbmjxpfhzytkiq.exe
        • Path C:\Windows\SysWOW64\ldxklbmjxpfhzytkiq.exe
        • Size 780KB
        • SHA256 add220d07c526439d1a3c7dff09f188330ee7150fe5ba33dac753e2ff396d796
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download