Overview

overview

10

Static

static

3

tmp_u63bu5o.exe

windows10-ltsc_2021-x64

10

tmp_u63bu5o.exe

windows10-2004-x64

10

tmp_u63bu5o.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    02/06/2026, 03:51

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General

  • Target
    tmp_u63bu5o.exe
  • Size 636KB
  • Sample260602-eewfjaew8n
  • SHA256 57c1e030441de1e230a0b4eccf9283b469684ebfa6835230435abfb26c94de74
  • 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 36 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 7 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 11 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 18 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\tmp_u63bu5o.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp_u63bu5o.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4628
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\users\admin\appdata\local\temp\tmp_u63bu5o.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:3688
      • C:\Users\Admin\AppData\Local\Temp\cjkwzis.exe
        "C:\Users\Admin\AppData\Local\Temp\cjkwzis.exe" "-C:\Users\Admin\AppData\Local\Temp\brbwiatdtiopvuyc.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:2032
      • C:\Users\Admin\AppData\Local\Temp\cjkwzis.exe
        "C:\Users\Admin\AppData\Local\Temp\cjkwzis.exe" "-C:\Users\Admin\AppData\Local\Temp\brbwiatdtiopvuyc.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:2684
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\users\admin\appdata\local\temp\tmp_u63bu5o.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:3644
  • C:\Windows\rjvsgavhzqybjkqwwl.exe
    rjvsgavhzqybjkqwwl.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2516
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\windows\rjvsgavhzqybjkqwwl.exe*."
      2⤵
      • Executes dropped EXE
      PID:656
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2248
  • C:\Users\Admin\AppData\Local\Temp\izkgtmgriyfhootyx.exe
    C:\Users\Admin\AppData\Local\Temp\izkgtmgriyfhootyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4968
  • C:\Windows\ezoofcapkepvgktcfxsnc.exe
    ezoofcapkepvgktcfxsnc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2848
  • C:\Windows\pjxwmiftngqvfiqyarlf.exe
    pjxwmiftngqvfiqyarlf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4544
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\windows\pjxwmiftngqvfiqyarlf.exe*."
      2⤵
      • Executes dropped EXE
      PID:4792
  • C:\Users\Admin\AppData\Local\Temp\brbwiatdtiopvuyc.exe
    C:\Users\Admin\AppData\Local\Temp\brbwiatdtiopvuyc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4396
  • C:\Windows\brbwiatdtiopvuyc.exe
    brbwiatdtiopvuyc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1724
  • C:\Windows\rjvsgavhzqybjkqwwl.exe
    rjvsgavhzqybjkqwwl.exe
    1⤵
    • Executes dropped EXE
    PID:4940
  • C:\Windows\ezoofcapkepvgktcfxsnc.exe
    ezoofcapkepvgktcfxsnc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1676
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\windows\ezoofcapkepvgktcfxsnc.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:4684
  • C:\Windows\pjxwmiftngqvfiqyarlf.exe
    pjxwmiftngqvfiqyarlf.exe
    1⤵
    • Executes dropped EXE
    PID:3828
  • C:\Users\Admin\AppData\Local\Temp\pjxwmiftngqvfiqyarlf.exe
    C:\Users\Admin\AppData\Local\Temp\pjxwmiftngqvfiqyarlf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:212
  • C:\Windows\cvigvqmzsktxgipwxng.exe
    cvigvqmzsktxgipwxng.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1808
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\windows\cvigvqmzsktxgipwxng.exe*."
      2⤵
      • Executes dropped EXE
      PID:2456
  • C:\Users\Admin\AppData\Local\Temp\cvigvqmzsktxgipwxng.exe
    C:\Users\Admin\AppData\Local\Temp\cvigvqmzsktxgipwxng.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1692
  • C:\Windows\brbwiatdtiopvuyc.exe
    brbwiatdtiopvuyc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3004
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\windows\brbwiatdtiopvuyc.exe*."
      2⤵
      • Executes dropped EXE
      PID:2220
  • C:\Users\Admin\AppData\Local\Temp\ezoofcapkepvgktcfxsnc.exe
    C:\Users\Admin\AppData\Local\Temp\ezoofcapkepvgktcfxsnc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2460
  • C:\Windows\izkgtmgriyfhootyx.exe
    izkgtmgriyfhootyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1904
  • C:\Windows\cvigvqmzsktxgipwxng.exe
    cvigvqmzsktxgipwxng.exe
    1⤵
    • Executes dropped EXE
    PID:1288
  • C:\Windows\izkgtmgriyfhootyx.exe
    izkgtmgriyfhootyx.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3236
    • C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe
      "C:\Users\Admin\AppData\Local\Temp\fbcwvunvplm.exe" "c:\windows\izkgtmgriyfhootyx.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:3452
  • C:\Users\Admin\AppData\Local\Temp\rjvsgavhzqybjkqwwl.exe
    C:\Users\Admin\AppData\Local\Temp\rjvsgavhzqybjkqwwl.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:784

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

        ghcifimhiizlcmbqzxyzuax.eza
        • Path C:\Program Files (x86)\ghcifimhiizlcmbqzxyzuax.eza
        • Size 272B
        • SHA256 db1105b1b81a9cc06faed42e60a217c30dfbfdf1c0b4be4ced97be5ca837e488
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cjkwzis.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cjkwzis.exe
        • Size 712KB
        • SHA256 83741f65bdc424478501708d3342ad65c2833b711eca753e58469f3344094fb2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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

        ghcifimhiizlcmbqzxyzuax.eza
        • Path C:\Users\Admin\AppData\Local\ghcifimhiizlcmbqzxyzuax.eza
        • Size 272B
        • SHA256 39b3da56eed7779b648950f8997498d0c7e12ecd55522c122c711e09657d1155
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        tflckyntfqsprmmmgpbntksgvbnyaxzuuu.xjv
        • Path C:\Users\Admin\AppData\Local\tflckyntfqsprmmmgpbntksgvbnyaxzuuu.xjv
        • Size 3KB
        • SHA256 1e9653e12716f7cf552c5d3efa761f04e76a8eb8efa87d2cb83c78cc5f79e0a4
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rjvsgavhzqybjkqwwl.exe
        • Path C:\Windows\SysWOW64\rjvsgavhzqybjkqwwl.exe
        • Size 636KB
        • SHA256 57c1e030441de1e230a0b4eccf9283b469684ebfa6835230435abfb26c94de74
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download