Overview

overview

10

Static

static

3

tmp5ca3rdjh.exe

windows10-ltsc_2021-x64

10

tmp5ca3rdjh.exe

windows10-2004-x64

10

tmp5ca3rdjh.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, 02:52

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General

  • Target
    tmp5ca3rdjh.exe
  • Size 576KB
  • Sample260602-dct91sdw4r
  • SHA256 1ed70970e81a93edb1e09878af5927c71fc6f16ec86b7a62ec444f858c97e7c0
  • 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 9 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\tmp5ca3rdjh.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp5ca3rdjh.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1748
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\users\admin\appdata\local\temp\tmp5ca3rdjh.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:3108
      • C:\Users\Admin\AppData\Local\Temp\zbfls.exe
        "C:\Users\Admin\AppData\Local\Temp\zbfls.exe" "-C:\Users\Admin\AppData\Local\Temp\wjyphxlhwfukyior.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:1468
      • C:\Users\Admin\AppData\Local\Temp\zbfls.exe
        "C:\Users\Admin\AppData\Local\Temp\zbfls.exe" "-C:\Users\Admin\AppData\Local\Temp\wjyphxlhwfukyior.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:5044
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\users\admin\appdata\local\temp\tmp5ca3rdjh.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:1708
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4944
  • C:\Windows\zrlhezstnbvqjyjryskea.exe
    zrlhezstnbvqjyjryskea.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2736
  • C:\Windows\mbslfxnlcnewmyglpg.exe
    mbslfxnlcnewmyglpg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:812
  • C:\Users\Admin\AppData\Local\Temp\kbuplfxxqdwqiwgntmdw.exe
    C:\Users\Admin\AppData\Local\Temp\kbuplfxxqdwqiwgntmdw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:680
  • C:\Windows\xnfzunedvhzsjwflqiy.exe
    xnfzunedvhzsjwflqiy.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1892
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\windows\xnfzunedvhzsjwflqiy.exe*."
      2⤵
      • Executes dropped EXE
      PID:3792
  • C:\Users\Admin\AppData\Local\Temp\wjyphxlhwfukyior.exe
    C:\Users\Admin\AppData\Local\Temp\wjyphxlhwfukyior.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3732
  • C:\Windows\mbslfxnlcnewmyglpg.exe
    mbslfxnlcnewmyglpg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3720
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\windows\mbslfxnlcnewmyglpg.exe*."
      2⤵
      • Executes dropped EXE
      PID:4456
  • C:\Windows\zrlhezstnbvqjyjryskea.exe
    zrlhezstnbvqjyjryskea.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3896
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\windows\zrlhezstnbvqjyjryskea.exe*."
      2⤵
      • Executes dropped EXE
      PID:4404
  • C:\Windows\wjyphxlhwfukyior.exe
    wjyphxlhwfukyior.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3264
  • C:\Windows\drhzsjyvlvlcrcjnq.exe
    drhzsjyvlvlcrcjnq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4388
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\windows\drhzsjyvlvlcrcjnq.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:2632
  • C:\Windows\kbuplfxxqdwqiwgntmdw.exe
    kbuplfxxqdwqiwgntmdw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4732
  • C:\Users\Admin\AppData\Local\Temp\mbslfxnlcnewmyglpg.exe
    C:\Users\Admin\AppData\Local\Temp\mbslfxnlcnewmyglpg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4068
  • C:\Windows\drhzsjyvlvlcrcjnq.exe
    drhzsjyvlvlcrcjnq.exe
    1⤵
    • Executes dropped EXE
    PID:2000
  • C:\Users\Admin\AppData\Local\Temp\zrlhezstnbvqjyjryskea.exe
    C:\Users\Admin\AppData\Local\Temp\zrlhezstnbvqjyjryskea.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4656
  • C:\Users\Admin\AppData\Local\Temp\drhzsjyvlvlcrcjnq.exe
    C:\Users\Admin\AppData\Local\Temp\drhzsjyvlvlcrcjnq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4188
  • C:\Windows\wjyphxlhwfukyior.exe
    wjyphxlhwfukyior.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:812
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\windows\wjyphxlhwfukyior.exe*."
      2⤵
      • Executes dropped EXE
      PID:1972
  • C:\Windows\xnfzunedvhzsjwflqiy.exe
    xnfzunedvhzsjwflqiy.exe
    1⤵
    • Executes dropped EXE
    PID:680
  • C:\Windows\kbuplfxxqdwqiwgntmdw.exe
    kbuplfxxqdwqiwgntmdw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:536
    • C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
      "C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe" "c:\windows\kbuplfxxqdwqiwgntmdw.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:3420
  • C:\Users\Admin\AppData\Local\Temp\xnfzunedvhzsjwflqiy.exe
    C:\Users\Admin\AppData\Local\Temp\xnfzunedvhzsjwflqiy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2500

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

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        Downloads

        mwhqvwurwgr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\mwhqvwurwgr.exe
        • Size 320KB
        • SHA256 0cc02d34d5fd4cf892fed282f98c1ad3e7dd6159a8877ae5c46d3f834ed36060
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        zbfls.exe
        • Path C:\Users\Admin\AppData\Local\Temp\zbfls.exe
        • Size 712KB
        • SHA256 025eb3819dc685fb5331b11333fc87a0cbb407f2b349af9257abf809acdb4e11
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        qruzfjlvyvycecwndghkpvzblo.osu
        • Path C:\Users\Admin\AppData\Local\qruzfjlvyvycecwndghkpvzblo.osu
        • Size 272B
        • SHA256 211e84df545fa8b6b7e62f98fdbab21a7ee01f924fa3273c3c77b020112fc3ce
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rdrhynavjrfuhqvxymymctivqemapclqsthth.odq
        • Path C:\Users\Admin\AppData\Local\rdrhynavjrfuhqvxymymctivqemapclqsthth.odq
        • Size 3KB
        • SHA256 367325c1fd926241c0f72f9448b65254c785f0bdb38c39eeb32c355d85773c23
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mbslfxnlcnewmyglpg.exe
        • Path C:\Windows\SysWOW64\mbslfxnlcnewmyglpg.exe
        • Size 576KB
        • SHA256 1ed70970e81a93edb1e09878af5927c71fc6f16ec86b7a62ec444f858c97e7c0
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download