Overview

overview

10

Static

static

3

tmpu53sm5nu.exe

windows10-ltsc_2021-x64

10

tmpu53sm5nu.exe

windows10-2004-x64

10

tmpu53sm5nu.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    148s
  • 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, 03:56

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General

  • Target
    tmpu53sm5nu.exe
  • Size 640KB
  • Sample260602-ehg3baex5l
  • SHA256 08565ab76bff7b276fa60584ca2adc3afafbce2ac1a47bd5cb014f744370e598
  • 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 9 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 6 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\tmpu53sm5nu.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpu53sm5nu.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4520
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpu53sm5nu.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:5000
      • C:\Users\Admin\AppData\Local\Temp\ygist.exe
        "C:\Users\Admin\AppData\Local\Temp\ygist.exe" "-c:\users\admin\appdata\local\temp\tmpu53sm5nu.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:2520
      • C:\Users\Admin\AppData\Local\Temp\ygist.exe
        "C:\Users\Admin\AppData\Local\Temp\ygist.exe" "-c:\users\admin\appdata\local\temp\tmpu53sm5nu.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:3404
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpu53sm5nu.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:4436
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:1044
  • C:\Windows\ywoofctpmfxucmdwzwmkc.exe
    ywoofctpmfxucmdwzwmkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2640
  • C:\Users\Admin\AppData\Local\Temp\ywoofctpmfxucmdwzwmkc.exe
    C:\Users\Admin\AppData\Local\Temp\ywoofctpmfxucmdwzwmkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4464
  • C:\Windows\jgxwmiytphyubkasuqfc.exe
    jgxwmiytphyubkasuqfc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2308
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\jgxwmiytphyubkasuqfc.exe*."
      2⤵
      • Executes dropped EXE
      PID:3732
  • C:\Windows\lgvsgaohbrgafmaqqk.exe
    lgvsgaohbrgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:512
  • C:\Windows\wsigvqfzulbwckzqrma.exe
    wsigvqfzulbwckzqrma.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1972
  • C:\Users\Admin\AppData\Local\Temp\jgxwmiytphyubkasuqfc.exe
    C:\Users\Admin\AppData\Local\Temp\jgxwmiytphyubkasuqfc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4272
  • C:\Users\Admin\AppData\Local\Temp\wsigvqfzulbwckzqrma.exe
    C:\Users\Admin\AppData\Local\Temp\wsigvqfzulbwckzqrma.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4112
  • C:\Windows\jgxwmiytphyubkasuqfc.exe
    jgxwmiytphyubkasuqfc.exe
    1⤵
    • Executes dropped EXE
    PID:4408
  • C:\Windows\lgvsgaohbrgafmaqqk.exe
    lgvsgaohbrgafmaqqk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5040
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\lgvsgaohbrgafmaqqk.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:3544
  • C:\Windows\cwkgtmzrkzngkqdsr.exe
    cwkgtmzrkzngkqdsr.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1428
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\cwkgtmzrkzngkqdsr.exe*."
      2⤵
      • Executes dropped EXE
      PID:1660
  • C:\Users\Admin\AppData\Local\Temp\cwkgtmzrkzngkqdsr.exe
    C:\Users\Admin\AppData\Local\Temp\cwkgtmzrkzngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4620
  • C:\Windows\ywoofctpmfxucmdwzwmkc.exe
    ywoofctpmfxucmdwzwmkc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5016
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\ywoofctpmfxucmdwzwmkc.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:4120
  • C:\Windows\vobwiamdvjworwiw.exe
    vobwiamdvjworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3236
  • C:\Windows\vobwiamdvjworwiw.exe
    vobwiamdvjworwiw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:924
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\vobwiamdvjworwiw.exe*."
      2⤵
      • Executes dropped EXE
      PID:1404
  • C:\Users\Admin\AppData\Local\Temp\lgvsgaohbrgafmaqqk.exe
    C:\Users\Admin\AppData\Local\Temp\lgvsgaohbrgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4204
  • C:\Windows\cwkgtmzrkzngkqdsr.exe
    cwkgtmzrkzngkqdsr.exe
    1⤵
    • Executes dropped EXE
    PID:4772
  • C:\Windows\wsigvqfzulbwckzqrma.exe
    wsigvqfzulbwckzqrma.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1668
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\wsigvqfzulbwckzqrma.exe*."
      2⤵
      • Executes dropped EXE
      PID:2908
  • C:\Users\Admin\AppData\Local\Temp\vobwiamdvjworwiw.exe
    C:\Users\Admin\AppData\Local\Temp\vobwiamdvjworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3696

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

        nayyfohuxki.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
        • Size 320KB
        • SHA256 caa7acc578e022122af329add88ab79008d8054c97247ce09e43fdcb9f0bf3a9
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ygist.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ygist.exe
        • Size 716KB
        • SHA256 d18d52279120f44b09cb04f3e3e3d9d53f4d52604a0432ad94c44217252af87d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        pwxggmmrxzagxqqsekjqraaggl.tua
        • Path C:\Users\Admin\AppData\Local\pwxggmmrxzagxqqsekjqraaggl.tua
        • Size 280B
        • SHA256 b786f1173276fa9bc7ab9f43acc1310afad67ea56b46eb7378a3401a4c3e4085
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        qiuozqbrivhyaepczqaseyjalbsfrikozmjak.oit
        • Path C:\Users\Admin\AppData\Local\qiuozqbrivhyaepczqaseyjalbsfrikozmjak.oit
        • Size 4KB
        • SHA256 e4f84a82f6c86e11b48768e88ff4c987c801aed1bb862e207e25a8dadf9c6be6
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        lgvsgaohbrgafmaqqk.exe
        • Path C:\Windows\SysWOW64\lgvsgaohbrgafmaqqk.exe
        • Size 640KB
        • SHA256 08565ab76bff7b276fa60584ca2adc3afafbce2ac1a47bd5cb014f744370e598
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download