Overview

overview

10

Static

static

3

tmpaczsrfhk.exe

windows10-ltsc_2021-x64

10

tmpaczsrfhk.exe

windows10-2004-x64

10

tmpaczsrfhk.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    149s
  • 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
    tmpaczsrfhk.exe
  • Size 652KB
  • Sample260522-sdde8aey5m
  • SHA256 21cf2dbc94539534633514f66bbd96351456ce3c5e8a7da2bac76d4f84435b1f
  • 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 64 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 63 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\tmpaczsrfhk.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpaczsrfhk.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2532
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\users\admin\appdata\local\temp\tmpaczsrfhk.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:1176
      • C:\Users\Admin\AppData\Local\Temp\aclpy.exe
        "C:\Users\Admin\AppData\Local\Temp\aclpy.exe" "-C:\Users\Admin\AppData\Local\Temp\xketnzsbthfsevfv.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:1508
      • C:\Users\Admin\AppData\Local\Temp\aclpy.exe
        "C:\Users\Admin\AppData\Local\Temp\aclpy.exe" "-C:\Users\Admin\AppData\Local\Temp\xketnzsbthfsevfv.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:980
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\users\admin\appdata\local\temp\tmpaczsrfhk.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:3120
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2988
  • C:\Windows\yoldaplxsjkapjwpqgd.exe
    yoldaplxsjkapjwpqgd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3652
  • C:\Windows\xketnzsbthfsevfv.exe
    xketnzsbthfsevfv.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3336
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\xketnzsbthfsevfv.exe*."
      2⤵
      • Executes dropped EXE
      PID:1660
  • C:\Users\Admin\AppData\Local\Temp\lcatrhernfhyojxrtkib.exe
    C:\Users\Admin\AppData\Local\Temp\lcatrhernfhyojxrtkib.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4624
  • C:\Windows\xketnzsbthfsevfv.exe
    xketnzsbthfsevfv.exe
    1⤵
    • Executes dropped EXE
    PID:112
  • C:\Users\Admin\AppData\Local\Temp\ncyplzufzppeslxppe.exe
    C:\Users\Admin\AppData\Local\Temp\ncyplzufzppeslxppe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:108
  • C:\Windows\asrlkbznkdgyplavyqpji.exe
    asrlkbznkdgyplavyqpji.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:716
  • C:\Windows\esndylfpixwkxparq.exe
    esndylfpixwkxparq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4880
  • C:\Windows\esndylfpixwkxparq.exe
    esndylfpixwkxparq.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2800
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\esndylfpixwkxparq.exe*."
      2⤵
      • Executes dropped EXE
      PID:1948
  • C:\Windows\yoldaplxsjkapjwpqgd.exe
    yoldaplxsjkapjwpqgd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1876
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\yoldaplxsjkapjwpqgd.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:3148
  • C:\Users\Admin\AppData\Local\Temp\xketnzsbthfsevfv.exe
    C:\Users\Admin\AppData\Local\Temp\xketnzsbthfsevfv.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:484
  • C:\Users\Admin\AppData\Local\Temp\esndylfpixwkxparq.exe
    C:\Users\Admin\AppData\Local\Temp\esndylfpixwkxparq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2040
  • C:\Windows\ncyplzufzppeslxppe.exe
    ncyplzufzppeslxppe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2988
  • C:\Windows\lcatrhernfhyojxrtkib.exe
    lcatrhernfhyojxrtkib.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3524
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\lcatrhernfhyojxrtkib.exe*."
      2⤵
      • Executes dropped EXE
      PID:4972
  • C:\Users\Admin\AppData\Local\Temp\asrlkbznkdgyplavyqpji.exe
    C:\Users\Admin\AppData\Local\Temp\asrlkbznkdgyplavyqpji.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4556
  • C:\Users\Admin\AppData\Local\Temp\yoldaplxsjkapjwpqgd.exe
    C:\Users\Admin\AppData\Local\Temp\yoldaplxsjkapjwpqgd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1040
  • C:\Windows\lcatrhernfhyojxrtkib.exe
    lcatrhernfhyojxrtkib.exe
    1⤵
    • Executes dropped EXE
    PID:108
  • C:\Windows\asrlkbznkdgyplavyqpji.exe
    asrlkbznkdgyplavyqpji.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:652
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\asrlkbznkdgyplavyqpji.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:1232
  • C:\Windows\ncyplzufzppeslxppe.exe
    ncyplzufzppeslxppe.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3200
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\ncyplzufzppeslxppe.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:3868

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

        aclpy.exe
        • Path C:\Users\Admin\AppData\Local\Temp\aclpy.exe
        • Size 720KB
        • SHA256 ee3d9d7dd5c7b5ecc65193d9fbdd249e27c719072640cf1d149200d0fed669ae
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        qzsahtyjajc.exe
        • Path C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
        • Size 320KB
        • SHA256 34a5f9e2b494b086abad2721019be271fa43350c9146f000e50fe554f170743d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        kkrtazfbghssrvsvggnpwvbxc.oon
        • Path C:\Users\Admin\AppData\Local\kkrtazfbghssrvsvggnpwvbxc.oon
        • Size 260B
        • SHA256 1b3cf2960ae69d7808c9bb392279b1d5b6f48605a5e61d9e7d58bb6900f85209
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        pasfxhyfvhdoynvjfqivnxovlxteodlzvgyl.nel
        • Path C:\Users\Admin\AppData\Local\pasfxhyfvhdoynvjfqivnxovlxteodlzvgyl.nel
        • Size 3KB
        • SHA256 1c42fad0e24eaa23596c76a31feef8b64b22802642d98888a8fb55e127285e1b
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ncyplzufzppeslxppe.exe
        • Path C:\Windows\SysWOW64\ncyplzufzppeslxppe.exe
        • Size 652KB
        • SHA256 21cf2dbc94539534633514f66bbd96351456ce3c5e8a7da2bac76d4f84435b1f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download