Overview

overview

10

Static

static

3

tmpkeezbcn2.exe

windows10-ltsc_2021-x64

10

tmpkeezbcn2.exe

windows10-2004-x64

10

tmpkeezbcn2.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • 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, 03:52

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General

  • Target
    tmpkeezbcn2.exe
  • Size 488KB
  • Sample260602-ee75bsew9p
  • SHA256 3a96625a5ed856e88d45f0ebd21c87b4096c3f2ef3e8fa151b6279f69075e179
  • 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 35 IoCs
    persistence
  • Disables RegEdit via registry modification 6 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 autorun.inf file 1 TTPs 4 IoCs

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

  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 55 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\tmpkeezbcn2.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpkeezbcn2.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3756
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpkeezbcn2.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:4432
      • C:\Users\Admin\AppData\Local\Temp\nqxfmn.exe
        "C:\Users\Admin\AppData\Local\Temp\nqxfmn.exe" "-C:\Users\Admin\AppData\Local\Temp\zmdvmxtizhworwiw.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:4968
      • C:\Users\Admin\AppData\Local\Temp\nqxfmn.exe
        "C:\Users\Admin\AppData\Local\Temp\nqxfmn.exe" "-C:\Users\Admin\AppData\Local\Temp\zmdvmxtizhworwiw.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:3860
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpkeezbcn2.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:4980
  • C:\Windows\nezvqffytfyubkasuqja.exe
    nezvqffytfyubkasuqja.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3328
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4252
  • C:\Windows\aqkfznmeyjbwckzqrme.exe
    aqkfznmeyjbwckzqrme.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1836
  • C:\Users\Admin\AppData\Local\Temp\pexrkxvmfpgafmaqqk.exe
    C:\Users\Admin\AppData\Local\Temp\pexrkxvmfpgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2616
  • C:\Windows\pexrkxvmfpgafmaqqk.exe
    pexrkxvmfpgafmaqqk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2188
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\pexrkxvmfpgafmaqqk.exe*."
      2⤵
      • Executes dropped EXE
      PID:3548
  • C:\Windows\cuqnjzauqdxucmdwzwqie.exe
    cuqnjzauqdxucmdwzwqie.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3496
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\cuqnjzauqdxucmdwzwqie.exe*."
      2⤵
      • Executes dropped EXE
      PID:4680
  • C:\Users\Admin\AppData\Local\Temp\gumfxjgwoxngkqdsr.exe
    C:\Users\Admin\AppData\Local\Temp\gumfxjgwoxngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4932
  • C:\Windows\nezvqffytfyubkasuqja.exe
    nezvqffytfyubkasuqja.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3416
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\nezvqffytfyubkasuqja.exe*."
      2⤵
      • Executes dropped EXE
      PID:4368
  • C:\Windows\cuqnjzauqdxucmdwzwqie.exe
    cuqnjzauqdxucmdwzwqie.exe
    1⤵
    • Executes dropped EXE
    PID:4252
  • C:\Windows\gumfxjgwoxngkqdsr.exe
    gumfxjgwoxngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1452
  • C:\Users\Admin\AppData\Local\Temp\zmdvmxtizhworwiw.exe
    C:\Users\Admin\AppData\Local\Temp\zmdvmxtizhworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1032
  • C:\Windows\zmdvmxtizhworwiw.exe
    zmdvmxtizhworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1928
  • C:\Users\Admin\AppData\Local\Temp\cuqnjzauqdxucmdwzwqie.exe
    C:\Users\Admin\AppData\Local\Temp\cuqnjzauqdxucmdwzwqie.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4688
  • C:\Windows\zmdvmxtizhworwiw.exe
    zmdvmxtizhworwiw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3628
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\zmdvmxtizhworwiw.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:1076
  • C:\Windows\aqkfznmeyjbwckzqrme.exe
    aqkfznmeyjbwckzqrme.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1988
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\aqkfznmeyjbwckzqrme.exe*."
      2⤵
      • Executes dropped EXE
      PID:4232
  • C:\Users\Admin\AppData\Local\Temp\nezvqffytfyubkasuqja.exe
    C:\Users\Admin\AppData\Local\Temp\nezvqffytfyubkasuqja.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1588
  • C:\Windows\gumfxjgwoxngkqdsr.exe
    gumfxjgwoxngkqdsr.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4344
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\gumfxjgwoxngkqdsr.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:2572
  • C:\Windows\pexrkxvmfpgafmaqqk.exe
    pexrkxvmfpgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    PID:3824
  • C:\Users\Admin\AppData\Local\Temp\aqkfznmeyjbwckzqrme.exe
    C:\Users\Admin\AppData\Local\Temp\aqkfznmeyjbwckzqrme.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1400

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

        Query Registry

        1
        T1012

        System Information Discovery

        3
        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

        cekrxximsptasmnqdkoqwdjjuye.fme
        • Path C:\Program Files (x86)\cekrxximsptasmnqdkoqwdjjuye.fme
        • Size 268B
        • SHA256 84a7291d4d074dab80fd5304dcc9fd64d28a045adc82d1e7e7834cafd70d1932
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cekrxximsptasmnqdkoqwdjjuye.fme
        • Path C:\Program Files (x86)\cekrxximsptasmnqdkoqwdjjuye.fme
        • Size 268B
        • SHA256 2173f54b60e1a342871f9f40604580f4d8a89dbc02b05d70d4dedb31b477066c
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cekrxximsptasmnqdkoqwdjjuye.fme
        • Path C:\Program Files (x86)\cekrxximsptasmnqdkoqwdjjuye.fme
        • Size 268B
        • SHA256 3f50551d17b56f0b66283409b3337c4f8424e0442902382c157ff009251fc4e3
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        nayyfohuxki.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
        • Size 320KB
        • SHA256 fa10ed2990ca760fb82fc16facf3d805f1a12ee3a8e5a723844cc1a0e3b88fcb
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nqxfmn.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nqxfmn.exe
        • Size 712KB
        • SHA256 2e26594e8a17eee980a186095504f77f9a6cc4d3411050492c104e0908a68129
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        cekrxximsptasmnqdkoqwdjjuye.fme
        • Path C:\Users\Admin\AppData\Local\cekrxximsptasmnqdkoqwdjjuye.fme
        • Size 268B
        • SHA256 e2ab69853674a83d0c9e439d85dfc352fe4736d2b8e79fa1b708ccb76ec90aea
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        zmdvmxtizhworwiwumbofxozvkbjyqtykywodq.zqb
        • Path C:\Users\Admin\AppData\Local\zmdvmxtizhworwiwumbofxozvkbjyqtykywodq.zqb
        • Size 3KB
        • SHA256 0d0d56a77d41e6a92dd3a45ead414af3256b2fd962f62297236ef84c481eac76
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        pexrkxvmfpgafmaqqk.exe
        • Path C:\Windows\SysWOW64\pexrkxvmfpgafmaqqk.exe
        • Size 488KB
        • SHA256 3a96625a5ed856e88d45f0ebd21c87b4096c3f2ef3e8fa151b6279f69075e179
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        pudnwznu.bat
        • Path C:\pudnwznu.bat
        • Size 544KB
        • SHA256 cd2be1186e3a1eed915bcbc76f4edf26df8e9e3f5b5b7598d178ab6093b9bbb2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download