Overview

overview

10

Static

static

3

tmp4st_eqfa.exe

windows10-ltsc_2021-x64

10

tmp4st_eqfa.exe

windows10-2004-x64

10

tmp4st_eqfa.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, 02:49

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General

  • Target
    tmp4st_eqfa.exe
  • Size 1016KB
  • Sample260602-da59hadv9r
  • SHA256 e7b8980122468ba6ef5c55324f392258f224365b97750983c127e96cd1a0f926
  • 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 33 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 4 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 40 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmp4st_eqfa.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp4st_eqfa.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3576
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\users\admin\appdata\local\temp\tmp4st_eqfa.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:4704
      • C:\Users\Admin\AppData\Local\Temp\cgoxbfr.exe
        "C:\Users\Admin\AppData\Local\Temp\cgoxbfr.exe" "-C:\Users\Admin\AppData\Local\Temp\bofxkxsaxjutdwzj.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:3740
      • C:\Users\Admin\AppData\Local\Temp\cgoxbfr.exe
        "C:\Users\Admin\AppData\Local\Temp\cgoxbfr.exe" "-C:\Users\Admin\AppData\Local\Temp\bofxkxsaxjutdwzj.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:4716
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\users\admin\appdata\local\temp\tmp4st_eqfa.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:2372
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2596
  • C:\Windows\rgztixuedrefrmrdyx.exe
    rgztixuedrefrmrdyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1996
  • C:\Windows\iwohvjfomzllwqufz.exe
    iwohvjfomzllwqufz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:784
  • C:\Users\Admin\AppData\Local\Temp\pgbxofeqrhwznkrfcdlc.exe
    C:\Users\Admin\AppData\Local\Temp\pgbxofeqrhwznkrfcdlc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3972
  • C:\Windows\iwohvjfomzllwqufz.exe
    iwohvjfomzllwqufz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4780
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\iwohvjfomzllwqufz.exe*."
      2⤵
      • Executes dropped EXE
      PID:1976
  • C:\Windows\pgbxofeqrhwznkrfcdlc.exe
    pgbxofeqrhwznkrfcdlc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1272
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\pgbxofeqrhwznkrfcdlc.exe*."
      2⤵
      • Executes dropped EXE
      PID:2368
  • C:\Users\Admin\AppData\Local\Temp\rgztixuedrefrmrdyx.exe
    C:\Users\Admin\AppData\Local\Temp\rgztixuedrefrmrdyx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2800
  • C:\Windows\bofxkxsaxjutdwzj.exe
    bofxkxsaxjutdwzj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:936
  • C:\Windows\ewsphzzmofvzomujhjskg.exe
    ewsphzzmofvzomujhjskg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4456
  • C:\Windows\ewsphzzmofvzomujhjskg.exe
    ewsphzzmofvzomujhjskg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4440
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\ewsphzzmofvzomujhjskg.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:4784
  • C:\Windows\csmhxnlwwlzbokqdzzg.exe
    csmhxnlwwlzbokqdzzg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2176
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\csmhxnlwwlzbokqdzzg.exe*."
      2⤵
      • Executes dropped EXE
      PID:2520
  • C:\Windows\pgbxofeqrhwznkrfcdlc.exe
    pgbxofeqrhwznkrfcdlc.exe
    1⤵
    • Executes dropped EXE
    PID:2752
  • C:\Windows\rgztixuedrefrmrdyx.exe
    rgztixuedrefrmrdyx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2368
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\rgztixuedrefrmrdyx.exe*."
      2⤵
      • Executes dropped EXE
      PID:4564
  • C:\Users\Admin\AppData\Local\Temp\iwohvjfomzllwqufz.exe
    C:\Users\Admin\AppData\Local\Temp\iwohvjfomzllwqufz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3444
  • C:\Users\Admin\AppData\Local\Temp\bofxkxsaxjutdwzj.exe
    C:\Users\Admin\AppData\Local\Temp\bofxkxsaxjutdwzj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2760
  • C:\Users\Admin\AppData\Local\Temp\ewsphzzmofvzomujhjskg.exe
    C:\Users\Admin\AppData\Local\Temp\ewsphzzmofvzomujhjskg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5080
  • C:\Windows\bofxkxsaxjutdwzj.exe
    bofxkxsaxjutdwzj.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2880
    • C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
      "C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe" "c:\windows\bofxkxsaxjutdwzj.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:4080
  • C:\Windows\csmhxnlwwlzbokqdzzg.exe
    csmhxnlwwlzbokqdzzg.exe
    1⤵
    • Executes dropped EXE
    PID:4936
  • C:\Users\Admin\AppData\Local\Temp\csmhxnlwwlzbokqdzzg.exe
    C:\Users\Admin\AppData\Local\Temp\csmhxnlwwlzbokqdzzg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2056

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

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        Downloads

        vwbhijsozzyljqhfmxpqvbcdmi.tsf
        • Path C:\Program Files (x86)\vwbhijsozzyljqhfmxpqvbcdmi.tsf
        • Size 280B
        • SHA256 7ff128f2627c4e016acfdfa661b41f3d9237ccf94932f42117a23d7a724a66b9
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        vwbhijsozzyljqhfmxpqvbcdmi.tsf
        • Path C:\Program Files (x86)\vwbhijsozzyljqhfmxpqvbcdmi.tsf
        • Size 280B
        • SHA256 957d03231b8139afaf55ddee9da9ac664fddaa266f6c78319c5bbddc3f104fd4
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cgoxbfr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cgoxbfr.exe
        • Size 708KB
        • SHA256 fc8789930f2a789111e688ab769b94e298fe888b4f452f53f6e004eea564853c
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        lfkywbphvpu.exe
        • Path C:\Users\Admin\AppData\Local\Temp\lfkywbphvpu.exe
        • Size 320KB
        • SHA256 4743f95de703ee22ea59d249b5ca2f7130657c6c656c77a24862e469145c0137
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        vwbhijsozzyljqhfmxpqvbcdmi.tsf
        • Path C:\Users\Admin\AppData\Local\vwbhijsozzyljqhfmxpqvbcdmi.tsf
        • Size 280B
        • SHA256 781dc8ce4b041e6952c55e1f2324c698e2d30190e47129b6c3e3ff77d8f6947c
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        wiypbnhokvfdmegphdgsizlxryufpnwoqzrnq.sjv
        • Path C:\Users\Admin\AppData\Local\wiypbnhokvfdmegphdgsizlxryufpnwoqzrnq.sjv
        • Size 4KB
        • SHA256 103a8e750b829b5300d5f9ffe5968566692ffca851bf7410a4cc148c17df4034
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        rgztixuedrefrmrdyx.exe
        • Path C:\Windows\SysWOW64\rgztixuedrefrmrdyx.exe
        • Size 1016KB
        • SHA256 e7b8980122468ba6ef5c55324f392258f224365b97750983c127e96cd1a0f926
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download