Overview

overview

10

Static

static

3

tmpfoxpotz0.exe

windows10-ltsc_2021-x64

10

tmpfoxpotz0.exe

windows10-2004-x64

10

tmpfoxpotz0.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    123s
  • 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, 03:52

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General

  • Target
    tmpfoxpotz0.exe
  • Size 1016KB
  • Sample260602-efdbcadt7y
  • SHA256 94297af35450e94c09bbc9a6216363c4c8a11a6a50169ca8c9cec594595aacc3
  • 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 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 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 17 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 40 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpfoxpotz0.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpfoxpotz0.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2156
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\users\admin\appdata\local\temp\tmpfoxpotz0.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:3300
      • C:\Users\Admin\AppData\Local\Temp\cbktr.exe
        "C:\Users\Admin\AppData\Local\Temp\cbktr.exe" "-C:\Users\Admin\AppData\Local\Temp\zjdxgumeqjutdwzj.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:2120
      • C:\Users\Admin\AppData\Local\Temp\cbktr.exe
        "C:\Users\Admin\AppData\Local\Temp\cbktr.exe" "-C:\Users\Admin\AppData\Local\Temp\zjdxgumeqjutdwzj.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:2576
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\users\admin\appdata\local\temp\tmpfoxpotz0.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:3800
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2520
  • C:\Windows\grmhrgzsfzllwqufz.exe
    grmhrgzsfzllwqufz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4088
  • C:\Windows\zjdxgumeqjutdwzj.exe
    zjdxgumeqjutdwzj.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:784
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\zjdxgumeqjutdwzj.exe*."
      2⤵
      • Executes dropped EXE
      PID:656
  • C:\Windows\crqpdwtqhfvzomujhjqfe.exe
    crqpdwtqhfvzomujhjqfe.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2456
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\crqpdwtqhfvzomujhjqfe.exe*."
      2⤵
      • Executes dropped EXE
      PID:2384
  • C:\Users\Admin\AppData\Local\Temp\ankhtkfaplzbokqdzze.exe
    C:\Users\Admin\AppData\Local\Temp\ankhtkfaplzbokqdzze.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1624
  • C:\Windows\crqpdwtqhfvzomujhjqfe.exe
    crqpdwtqhfvzomujhjqfe.exe
    1⤵
    • Executes dropped EXE
    PID:4728
  • C:\Windows\ankhtkfaplzbokqdzze.exe
    ankhtkfaplzbokqdzze.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1896
  • C:\Windows\pbxteuoiwrefrmrdyx.exe
    pbxteuoiwrefrmrdyx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4536
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\pbxteuoiwrefrmrdyx.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:3772
  • C:\Users\Admin\AppData\Local\Temp\crqpdwtqhfvzomujhjqfe.exe
    C:\Users\Admin\AppData\Local\Temp\crqpdwtqhfvzomujhjqfe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3972
  • C:\Windows\nbzxkcyukhwznkrfcdjx.exe
    nbzxkcyukhwznkrfcdjx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4888
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\nbzxkcyukhwznkrfcdjx.exe*."
      2⤵
      • Executes dropped EXE
      PID:1012
  • C:\Windows\pbxteuoiwrefrmrdyx.exe
    pbxteuoiwrefrmrdyx.exe
    1⤵
    • Executes dropped EXE
    PID:1764
  • C:\Users\Admin\AppData\Local\Temp\grmhrgzsfzllwqufz.exe
    C:\Users\Admin\AppData\Local\Temp\grmhrgzsfzllwqufz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3228
  • C:\Users\Admin\AppData\Local\Temp\zjdxgumeqjutdwzj.exe
    C:\Users\Admin\AppData\Local\Temp\zjdxgumeqjutdwzj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4648
  • C:\Windows\ankhtkfaplzbokqdzze.exe
    ankhtkfaplzbokqdzze.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2204
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\ankhtkfaplzbokqdzze.exe*."
      2⤵
      • Executes dropped EXE
      PID:232
  • C:\Users\Admin\AppData\Local\Temp\nbzxkcyukhwznkrfcdjx.exe
    C:\Users\Admin\AppData\Local\Temp\nbzxkcyukhwznkrfcdjx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4908
  • C:\Users\Admin\AppData\Local\Temp\pbxteuoiwrefrmrdyx.exe
    C:\Users\Admin\AppData\Local\Temp\pbxteuoiwrefrmrdyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2196
  • C:\Windows\grmhrgzsfzllwqufz.exe
    grmhrgzsfzllwqufz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3404
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\grmhrgzsfzllwqufz.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:4388
  • C:\Windows\nbzxkcyukhwznkrfcdjx.exe
    nbzxkcyukhwznkrfcdjx.exe
    1⤵
    • Executes dropped EXE
    PID:2504
  • C:\Windows\zjdxgumeqjutdwzj.exe
    zjdxgumeqjutdwzj.exe
    1⤵
    • Executes dropped EXE
    PID:2324

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

        cbktr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cbktr.exe
        • Size 720KB
        • SHA256 da8b0854ebf2085c1c792501b4ece37bca2bceebee54d0d18ef66185b715e65b
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        lfkywbphvpu.exe
        • Path C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
        • Size 320KB
        • SHA256 2cac1743d0b497761d10f87599bbe1c15321ff3b39d84cca37c3ac3f633600ef
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        trzhegmsszyljqhfmxnltbyagm.tsf
        • Path C:\Users\Admin\AppData\Local\trzhegmsszyljqhfmxnltbyagm.tsf
        • Size 280B
        • SHA256 db2163da7f544c041791653556f2d60e2316101d648240aef3ce658cca0a231e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        udwpxkbsdvfdmegphdengzhulcnfpnwoqzrno.qjr
        • Path C:\Users\Admin\AppData\Local\udwpxkbsdvfdmegphdengzhulcnfpnwoqzrno.qjr
        • Size 4KB
        • SHA256 096fc4c3d6cc16ec0d6e5ba09743ce6d54e2870a2339ec209df7b1fcc7c83beb
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        pbxteuoiwrefrmrdyx.exe
        • Path C:\Windows\SysWOW64\pbxteuoiwrefrmrdyx.exe
        • Size 1016KB
        • SHA256 94297af35450e94c09bbc9a6216363c4c8a11a6a50169ca8c9cec594595aacc3
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download