Overview

overview

10

Static

static

3

tmpkfdisqat.exe

windows10-ltsc_2021-x64

10

tmpkfdisqat.exe

windows10-2004-x64

10

tmpkfdisqat.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
    22/05/2026, 15:03

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General

  • Target
    tmpkfdisqat.exe
  • Size 516KB
  • Sample260522-sff9wshs8x
  • SHA256 1c4fcff23a29745f4898a96751ebc60a54f24d887eb91c1c94eb0e8b91dfa288
  • 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 37 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 7 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 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\tmpkfdisqat.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpkfdisqat.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5040
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\users\admin\appdata\local\temp\tmpkfdisqat.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:2452
      • C:\Users\Admin\AppData\Local\Temp\efhls.exe
        "C:\Users\Admin\AppData\Local\Temp\efhls.exe" "-C:\Users\Admin\AppData\Local\Temp\bnaphbqfxhrcqeah.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:2804
      • C:\Users\Admin\AppData\Local\Temp\efhls.exe
        "C:\Users\Admin\AppData\Local\Temp\efhls.exe" "-C:\Users\Admin\AppData\Local\Temp\bnaphbqfxhrcqeah.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:4272
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\users\admin\appdata\local\temp\tmpkfdisqat.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:432
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:956
  • C:\Windows\ivjzsndtmxiujyvda.exe
    ivjzsndtmxiujyvda.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4840
  • C:\Windows\crhzurjbwjwkbsrbamg.exe
    crhzurjbwjwkbsrbamg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1612
  • C:\Windows\bnaphbqfxhrcqeah.exe
    bnaphbqfxhrcqeah.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2800
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\bnaphbqfxhrcqeah.exe*."
      2⤵
      • Executes dropped EXE
      PID:436
  • C:\Windows\rfulfbsjdpboeusbzk.exe
    rfulfbsjdpboeusbzk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2612
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\rfulfbsjdpboeusbzk.exe*."
      2⤵
      • Executes dropped EXE
      PID:1836
  • C:\Users\Admin\AppData\Local\Temp\bnaphbqfxhrcqeah.exe
    C:\Users\Admin\AppData\Local\Temp\bnaphbqfxhrcqeah.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4664
  • C:\Users\Admin\AppData\Local\Temp\crhzurjbwjwkbsrbamg.exe
    C:\Users\Admin\AppData\Local\Temp\crhzurjbwjwkbsrbamg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2656
  • C:\Windows\evnhedxrodsibuvhiwsjb.exe
    evnhedxrodsibuvhiwsjb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2764
  • C:\Users\Admin\AppData\Local\Temp\pfwpljcvrftiassddqlb.exe
    C:\Users\Admin\AppData\Local\Temp\pfwpljcvrftiassddqlb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4116
  • C:\Windows\crhzurjbwjwkbsrbamg.exe
    crhzurjbwjwkbsrbamg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3220
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\crhzurjbwjwkbsrbamg.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:2660
  • C:\Windows\rfulfbsjdpboeusbzk.exe
    rfulfbsjdpboeusbzk.exe
    1⤵
    • Executes dropped EXE
    PID:3228
  • C:\Windows\pfwpljcvrftiassddqlb.exe
    pfwpljcvrftiassddqlb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1188
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\pfwpljcvrftiassddqlb.exe*."
      2⤵
      • Executes dropped EXE
      PID:2164
  • C:\Windows\ivjzsndtmxiujyvda.exe
    ivjzsndtmxiujyvda.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4044
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\ivjzsndtmxiujyvda.exe*."
      2⤵
      • Executes dropped EXE
      PID:2456
  • C:\Users\Admin\AppData\Local\Temp\ivjzsndtmxiujyvda.exe
    C:\Users\Admin\AppData\Local\Temp\ivjzsndtmxiujyvda.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1492
  • C:\Windows\evnhedxrodsibuvhiwsjb.exe
    evnhedxrodsibuvhiwsjb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3188
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\evnhedxrodsibuvhiwsjb.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:1820
  • C:\Windows\pfwpljcvrftiassddqlb.exe
    pfwpljcvrftiassddqlb.exe
    1⤵
    • Executes dropped EXE
    PID:1028
  • C:\Users\Admin\AppData\Local\Temp\evnhedxrodsibuvhiwsjb.exe
    C:\Users\Admin\AppData\Local\Temp\evnhedxrodsibuvhiwsjb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3804
  • C:\Windows\bnaphbqfxhrcqeah.exe
    bnaphbqfxhrcqeah.exe
    1⤵
    • Executes dropped EXE
    PID:3548
  • C:\Users\Admin\AppData\Local\Temp\rfulfbsjdpboeusbzk.exe
    C:\Users\Admin\AppData\Local\Temp\rfulfbsjdpboeusbzk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3928

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

        onnpubdfkhecdenhqmqpprwdf.mjg
        • Path C:\Program Files (x86)\onnpubdfkhecdenhqmqpprwdf.mjg
        • Size 272B
        • SHA256 287f83a34e49802dd21f3a9c9c0364e2e365fff8c39c0d0ffb57093f4960914e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        onnpubdfkhecdenhqmqpprwdf.mjg
        • Path C:\Program Files (x86)\onnpubdfkhecdenhqmqpprwdf.mjg
        • Size 272B
        • SHA256 09ba8c49a9754ae11d6bf7bbb2967092ffbf9e13a410794b7ef715915f105466
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        onnpubdfkhecdenhqmqpprwdf.mjg
        • Path C:\Program Files (x86)\onnpubdfkhecdenhqmqpprwdf.mjg
        • Size 272B
        • SHA256 cf356f912fe03c265cf60e25f2d82560f36136590edf2fa3dec9029187f08f87
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        efhls.exe
        • Path C:\Users\Admin\AppData\Local\Temp\efhls.exe
        • Size 696KB
        • SHA256 b158232a9406b25f4d6373d4187da30772f729acaca21f6e295ddd73843d4a60
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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

        onnpubdfkhecdenhqmqpprwdf.mjg
        • Path C:\Users\Admin\AppData\Local\onnpubdfkhecdenhqmqpprwdf.mjg
        • Size 272B
        • SHA256 ffcf9aa6300a6c85c8bf4ca1d68fad4ea69b3589c1049613e87a7e8198794564
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        tdobrjwjzhpykwqvpwlvgtjbobrzhqcoinho.nyl
        • Path C:\Users\Admin\AppData\Local\tdobrjwjzhpykwqvpwlvgtjbobrzhqcoinho.nyl
        • Size 3KB
        • SHA256 f5f64c2c22581fba7f06e898b6afac85e09cbc5f9b8833a53e22984a454118d6
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rfulfbsjdpboeusbzk.exe
        • Path C:\Windows\SysWOW64\rfulfbsjdpboeusbzk.exe
        • Size 516KB
        • SHA256 1c4fcff23a29745f4898a96751ebc60a54f24d887eb91c1c94eb0e8b91dfa288
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        cfjpyjp.bat
        • Path C:\cfjpyjp.bat
        • Size 556KB
        • SHA256 9143f60150c9c76a5a5de8b6bbd83665268c81c6a7c18155ba87a40067c36a78
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download