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
    145s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-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 7 IoCs
    persistence
  • UAC bypass 3 TTPs 16 IoCs
    defense_evasiontrojan
  • Adds policy Run key to start application 2 TTPs 37 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 14 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 53 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 53 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 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpjcstyod7.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpjcstyod7.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2888
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.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
      • 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:2548
      • C:\Users\Admin\AppData\Local\Temp\tbjueis.exe
        "C:\Users\Admin\AppData\Local\Temp\tbjueis.exe" "-C:\Users\Admin\AppData\Local\Temp\sjaunatfxjzhaohw.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:4208
      • C:\Users\Admin\AppData\Local\Temp\tbjueis.exe
        "C:\Users\Admin\AppData\Local\Temp\tbjueis.exe" "-C:\Users\Admin\AppData\Local\Temp\sjaunatfxjzhaohw.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:3956
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.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:1488
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:3024
  • C:\Windows\gbwurifvrhbnkczsiycx.exe
    gbwurifvrhbnkczsiycx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3540
  • C:\Windows\gbwurifvrhbnkczsiycx.exe
    gbwurifvrhbnkczsiycx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5552
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe" "c:\windows\gbwurifvrhbnkczsiycx.exe*."
      2⤵
      • Executes dropped EXE
      PID:2152
  • C:\Users\Admin\AppData\Local\Temp\zrjeymgtmzqzticsf.exe
    C:\Users\Admin\AppData\Local\Temp\zrjeymgtmzqzticsf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5984
  • C:\Windows\sjaunatfxjzhaohw.exe
    sjaunatfxjzhaohw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4144
  • C:\Windows\zrjeymgtmzqzticsf.exe
    zrjeymgtmzqzticsf.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5084
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe" "c:\windows\zrjeymgtmzqzticsf.exe*."
      2⤵
      • Executes dropped EXE
      PID:1488
  • C:\Users\Admin\AppData\Local\Temp\vrnmkcarofanlecwnejfb.exe
    C:\Users\Admin\AppData\Local\Temp\vrnmkcarofanlecwnejfb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3696
  • C:\Windows\ibuqlavjdrjtoezqes.exe
    ibuqlavjdrjtoezqes.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2108
  • C:\Windows\vrnmkcarofanlecwnejfb.exe
    vrnmkcarofanlecwnejfb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4264
  • C:\Windows\zrjeymgtmzqzticsf.exe
    zrjeymgtmzqzticsf.exe
    1⤵
    • Executes dropped EXE
    PID:3104
  • C:\Windows\sjaunatfxjzhaohw.exe
    sjaunatfxjzhaohw.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe" "c:\windows\sjaunatfxjzhaohw.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:232
  • C:\Windows\ibuqlavjdrjtoezqes.exe
    ibuqlavjdrjtoezqes.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5604
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe" "c:\windows\ibuqlavjdrjtoezqes.exe*."
      2⤵
      • Executes dropped EXE
      PID:3972
  • C:\Users\Admin\AppData\Local\Temp\ibuqlavjdrjtoezqes.exe
    C:\Users\Admin\AppData\Local\Temp\ibuqlavjdrjtoezqes.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2796
  • C:\Users\Admin\AppData\Local\Temp\tnheaqmbwleplcyqfux.exe
    C:\Users\Admin\AppData\Local\Temp\tnheaqmbwleplcyqfux.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2036
  • C:\Windows\tnheaqmbwleplcyqfux.exe
    tnheaqmbwleplcyqfux.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4736
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe" "c:\windows\tnheaqmbwleplcyqfux.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:4888
  • C:\Windows\tnheaqmbwleplcyqfux.exe
    tnheaqmbwleplcyqfux.exe
    1⤵
    • Executes dropped EXE
    PID:5152
  • C:\Users\Admin\AppData\Local\Temp\sjaunatfxjzhaohw.exe
    C:\Users\Admin\AppData\Local\Temp\sjaunatfxjzhaohw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1240
  • C:\Windows\vrnmkcarofanlecwnejfb.exe
    vrnmkcarofanlecwnejfb.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2316
    • C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
      "C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe" "c:\windows\vrnmkcarofanlecwnejfb.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:4684
  • C:\Users\Admin\AppData\Local\Temp\gbwurifvrhbnkczsiycx.exe
    C:\Users\Admin\AppData\Local\Temp\gbwurifvrhbnkczsiycx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5924

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

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        Downloads

        qthqeovcadr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\qthqeovcadr.exe
        • Size 320KB
        • SHA256 9482f857765a42c1220a3c02549882a1aee5cbab3fb174cd3be2697062359ea5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        tbjueis.exe
        • Path C:\Users\Admin\AppData\Local\Temp\tbjueis.exe
        • Size 708KB
        • SHA256 f37fde3ecbde91475c5c023c1e3ada110b098138ac9c68aa2197e4ae286353ab
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        mrwelmttzzdzgipsssglqyfgnn.txt
        • Path C:\Users\Admin\AppData\Local\mrwelmttzzdzgipsssglqyfgnn.txt
        • Size 280B
        • SHA256 1ddc5c96974304292c446b56a5f186d713186bacdcaa05cd711c84cf778ba3ea
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ndtmeqitkvkrjwocnyxndwoasdufubtgymxih.ngy
        • Path C:\Users\Admin\AppData\Local\ndtmeqitkvkrjwocnyxndwoasdufubtgymxih.ngy
        • Size 4KB
        • SHA256 70aef87d3334e10686dcef670e5a38116356b7864a5d01f2a1039611f014ec32
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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