Overview

overview

10

Static

static

3

tmpzu_3jud5.exe

windows10-ltsc_2021-x64

10

tmpzu_3jud5.exe

windows10-2004-x64

10

tmpzu_3jud5.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    158s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    22/05/2026, 14:14

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General

  • Target
    tmpzu_3jud5.exe
  • Size 1016KB
  • Sample260522-rkfcqafz21
  • SHA256 19fb2733fd679e81dbbd1e1624b2aa51496478810766901ee5a26242605fa64d
  • 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 7 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 7 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 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\tmpzu_3jud5.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpzu_3jud5.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3508
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\users\admin\appdata\local\temp\tmpzu_3jud5.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:3756
      • C:\Users\Admin\AppData\Local\Temp\ybqvyjn.exe
        "C:\Users\Admin\AppData\Local\Temp\ybqvyjn.exe" "-C:\Users\Admin\AppData\Local\Temp\xjhvhbofthlasrsv.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:1800
      • C:\Users\Admin\AppData\Local\Temp\ybqvyjn.exe
        "C:\Users\Admin\AppData\Local\Temp\ybqvyjn.exe" "-C:\Users\Admin\AppData\Local\Temp\xjhvhbofthlasrsv.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:2544
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\users\admin\appdata\local\temp\tmpzu_3jud5.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:4156
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4992
  • C:\Windows\nbbrfbqjzpvmghkpvh.exe
    nbbrfbqjzpvmghkpvh.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:900
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\nbbrfbqjzpvmghkpvh.exe*."
      2⤵
      • Executes dropped EXE
      PID:3548
  • C:\Windows\xjhvhbofthlasrsv.exe
    xjhvhbofthlasrsv.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2920
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\xjhvhbofthlasrsv.exe*."
      2⤵
      • Executes dropped EXE
      PID:1708
  • C:\Windows\nbbrfbqjzpvmghkpvh.exe
    nbbrfbqjzpvmghkpvh.exe
    1⤵
    • Executes dropped EXE
    PID:3824
  • C:\Users\Admin\AppData\Local\Temp\xjhvhbofthlasrsv.exe
    C:\Users\Admin\AppData\Local\Temp\xjhvhbofthlasrsv.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3240
  • C:\Windows\arunedvrkdmgdhnvetofi.exe
    arunedvrkdmgdhnvetofi.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4572
  • C:\Users\Admin\AppData\Local\Temp\ynofurhbsjqidfjpwjc.exe
    C:\Users\Admin\AppData\Local\Temp\ynofurhbsjqidfjpwjc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1336
  • C:\Windows\ynofurhbsjqidfjpwjc.exe
    ynofurhbsjqidfjpwjc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4400
  • C:\Users\Admin\AppData\Local\Temp\nbbrfbqjzpvmghkpvh.exe
    C:\Users\Admin\AppData\Local\Temp\nbbrfbqjzpvmghkpvh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4436
  • C:\Windows\arunedvrkdmgdhnvetofi.exe
    arunedvrkdmgdhnvetofi.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3964
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\arunedvrkdmgdhnvetofi.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:4420
  • C:\Users\Admin\AppData\Local\Temp\arunedvrkdmgdhnvetofi.exe
    C:\Users\Admin\AppData\Local\Temp\arunedvrkdmgdhnvetofi.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3848
  • C:\Windows\lbdvljavnfngcfkrznhx.exe
    lbdvljavnfngcfkrznhx.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3512
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\lbdvljavnfngcfkrznhx.exe*."
      2⤵
      • Executes dropped EXE
      PID:3820
  • C:\Windows\xjhvhbofthlasrsv.exe
    xjhvhbofthlasrsv.exe
    1⤵
    • Executes dropped EXE
    PID:4200
  • C:\Windows\ynofurhbsjqidfjpwjc.exe
    ynofurhbsjqidfjpwjc.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\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\ynofurhbsjqidfjpwjc.exe*."
      2⤵
      • Executes dropped EXE
      PID:1492
  • C:\Windows\erqfsnbtixcsllnrw.exe
    erqfsnbtixcsllnrw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4852
  • C:\Users\Admin\AppData\Local\Temp\erqfsnbtixcsllnrw.exe
    C:\Users\Admin\AppData\Local\Temp\erqfsnbtixcsllnrw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4448
  • C:\Windows\lbdvljavnfngcfkrznhx.exe
    lbdvljavnfngcfkrznhx.exe
    1⤵
    • Executes dropped EXE
    PID:4284
  • C:\Users\Admin\AppData\Local\Temp\lbdvljavnfngcfkrznhx.exe
    C:\Users\Admin\AppData\Local\Temp\lbdvljavnfngcfkrznhx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4536
  • C:\Windows\erqfsnbtixcsllnrw.exe
    erqfsnbtixcsllnrw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3956
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\erqfsnbtixcsllnrw.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:3076

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

        cmztpnmrmwj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
        • Size 320KB
        • SHA256 50a4058158b9f08e557917e09b27d3069e1d9bb3029211185083a465c0653ab6
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ybqvyjn.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ybqvyjn.exe
        • Size 704KB
        • SHA256 03e3fa731e06b253bb9a4b9c4f43c5ca006fa17e1f59bff073ea7df4a9e66843
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        cxebwzvvspcabjtfslkfm.ehd
        • Path C:\Users\Admin\AppData\Local\cxebwzvvspcabjtfslkfm.ehd
        • Size 280B
        • SHA256 d8098611625b62a5df716f33e9a782b752681b2c5bf854943cfb704c2de439a6
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        xdvdjxepxfdmyrmjhlvbtbhvcnvdbkwp.hfj
        • Path C:\Users\Admin\AppData\Local\xdvdjxepxfdmyrmjhlvbtbhvcnvdbkwp.hfj
        • Size 4KB
        • SHA256 b6c0074ef0d63f99fecc2e4a12eaf7db8f4dbd7f63eb8c9ccc8a3866b4e277d3
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nbbrfbqjzpvmghkpvh.exe
        • Path C:\Windows\SysWOW64\nbbrfbqjzpvmghkpvh.exe
        • Size 1016KB
        • SHA256 19fb2733fd679e81dbbd1e1624b2aa51496478810766901ee5a26242605fa64d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download