Overview

overview

10

Static

static

3

tmp_toxf6el.exe

windows10-ltsc_2021-x64

10

tmp_toxf6el.exe

windows10-2004-x64

10

tmp_toxf6el.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    02/06/2026, 03:53

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General

  • Target
    tmp_toxf6el.exe
  • Size 476KB
  • Sample260602-efqxfaex2q
  • SHA256 1b1f772b3fba3cc0537b5346915ffbe9668a239a310d9d37e2d938e604cc4adf
  • 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 6 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops autorun.inf file 1 TTPs 4 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • 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\tmp_toxf6el.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp_toxf6el.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4592
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\users\admin\appdata\local\temp\tmp_toxf6el.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:4396
      • C:\Users\Admin\AppData\Local\Temp\wfksbls.exe
        "C:\Users\Admin\AppData\Local\Temp\wfksbls.exe" "-C:\Users\Admin\AppData\Local\Temp\vnbskdtjynkwmxzh.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 autorun.inf file
        • 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:3596
      • C:\Users\Admin\AppData\Local\Temp\wfksbls.exe
        "C:\Users\Admin\AppData\Local\Temp\wfksbls.exe" "-C:\Users\Admin\AppData\Local\Temp\vnbskdtjynkwmxzh.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:5064
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\users\admin\appdata\local\temp\tmp_toxf6el.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:3312
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:5212
  • C:\Windows\jfxsolfzslmcwlrdjlhz.exe
    jfxsolfzslmcwlrdjlhz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1312
  • C:\Users\Admin\AppData\Local\Temp\cvkcvpgxndbofrudg.exe
    C:\Users\Admin\AppData\Local\Temp\cvkcvpgxndbofrudg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3984
  • C:\Windows\cvkcvpgxndbofrudg.exe
    cvkcvpgxndbofrudg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2524
  • C:\Users\Admin\AppData\Local\Temp\vnbskdtjynkwmxzh.exe
    C:\Users\Admin\AppData\Local\Temp\vnbskdtjynkwmxzh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5224
  • C:\Windows\wricxtmfxppexlqbghc.exe
    wricxtmfxppexlqbghc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1156
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\wricxtmfxppexlqbghc.exe*."
      2⤵
      • Executes dropped EXE
      PID:4472
  • C:\Windows\cvkcvpgxndbofrudg.exe
    cvkcvpgxndbofrudg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5244
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\cvkcvpgxndbofrudg.exe*."
      2⤵
      • Executes dropped EXE
      PID:4692
  • C:\Users\Admin\AppData\Local\Temp\jfxsolfzslmcwlrdjlhz.exe
    C:\Users\Admin\AppData\Local\Temp\jfxsolfzslmcwlrdjlhz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1712
  • C:\Users\Admin\AppData\Local\Temp\yvokhfavpjlcxnuhorohd.exe
    C:\Users\Admin\AppData\Local\Temp\yvokhfavpjlcxnuhorohd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1504
  • C:\Windows\lfvoidvnevuianrbff.exe
    lfvoidvnevuianrbff.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4880
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\lfvoidvnevuianrbff.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:5616
  • C:\Windows\yvokhfavpjlcxnuhorohd.exe
    yvokhfavpjlcxnuhorohd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5368
  • C:\Windows\vnbskdtjynkwmxzh.exe
    vnbskdtjynkwmxzh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2484
  • C:\Windows\vnbskdtjynkwmxzh.exe
    vnbskdtjynkwmxzh.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1372
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\vnbskdtjynkwmxzh.exe*."
      2⤵
      • Executes dropped EXE
      PID:3180
  • C:\Users\Admin\AppData\Local\Temp\wricxtmfxppexlqbghc.exe
    C:\Users\Admin\AppData\Local\Temp\wricxtmfxppexlqbghc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4516
  • C:\Users\Admin\AppData\Local\Temp\lfvoidvnevuianrbff.exe
    C:\Users\Admin\AppData\Local\Temp\lfvoidvnevuianrbff.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1104
  • C:\Windows\lfvoidvnevuianrbff.exe
    lfvoidvnevuianrbff.exe
    1⤵
    • Executes dropped EXE
    PID:984
  • C:\Windows\wricxtmfxppexlqbghc.exe
    wricxtmfxppexlqbghc.exe
    1⤵
    • Executes dropped EXE
    PID:2256
  • C:\Windows\jfxsolfzslmcwlrdjlhz.exe
    jfxsolfzslmcwlrdjlhz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4268
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\jfxsolfzslmcwlrdjlhz.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:3484
  • C:\Windows\yvokhfavpjlcxnuhorohd.exe
    yvokhfavpjlcxnuhorohd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:544
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\yvokhfavpjlcxnuhorohd.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:344

Network

        MITRE ATT&CK Enterprise v16

        Reconnaissance

        Resource Development

        Initial Access

        Replication Through Removable Media

        1
        T1091

        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

        Replication Through Removable Media

        1
        T1091

        Collection

        Command and Control

        Exfiltration

        Impact

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        abyyzbazxvbwvparcjkhh.kji
        • Path C:\Program Files (x86)\abyyzbazxvbwvparcjkhh.kji
        • Size 272B
        • SHA256 1014bed0d99b694f74ec9eb90ebc87cb814fb8308f87204de49b40c37f5dfa15
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        abyyzbazxvbwvparcjkhh.kji
        • Path C:\Program Files (x86)\abyyzbazxvbwvparcjkhh.kji
        • Size 272B
        • SHA256 84a58ba78fda1135c482e6ae5c581ce32d31655a465e55da31fb8a304c663502
        • MD5 SHA1 SHA512 TLSH
        Submit Download

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

        wfksbls.exe
        • Path C:\Users\Admin\AppData\Local\Temp\wfksbls.exe
        • Size 728KB
        • SHA256 cab3dfb2a9dec6186b78f9351265c276105d1db308420926c21b58ccb39be7b3
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        RCXDA3A.tmp
        • Path C:\Users\Admin\AppData\Local\Temp\wfksbls\RCXDA3A.tmp
        • Size 1.1MB
        • SHA256 7882ba298c2c4368beec2b99d90f751e5464df410718f9eedb911bde528e4fb9
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        abyyzbazxvbwvparcjkhh.kji
        • Path C:\Users\Admin\AppData\Local\abyyzbazxvbwvparcjkhh.kji
        • Size 272B
        • SHA256 9d9995db3bfba7b473b0a414f4362e4be8f7deb68d5f18d4690ef639f56c1ccd
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        vhpamzjtclcisxtvrjvdoanxhqzqwglh.fxj
        • Path C:\Users\Admin\AppData\Local\vhpamzjtclcisxtvrjvdoanxhqzqwglh.fxj
        • Size 3KB
        • SHA256 ac265904a4d5d1589f58323c3a834aa93cd1ab521815514c85973981edd90eb5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        lfvoidvnevuianrbff.exe
        • Path C:\Windows\SysWOW64\lfvoidvnevuianrbff.exe
        • Size 476KB
        • SHA256 1b1f772b3fba3cc0537b5346915ffbe9668a239a310d9d37e2d938e604cc4adf
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download