Overview

overview

10

Static

static

3

tmpkkh4rwcm.exe

windows10-ltsc_2021-x64

10

tmpkkh4rwcm.exe

windows10-2004-x64

10

tmpkkh4rwcm.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, 03:24

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General

  • Target
    tmpkkh4rwcm.exe
  • Size 532KB
  • Sample260602-dx183acy31
  • SHA256 4579fb72623b0b912926a83c720918ec4ec1ad8a14a1aadc02b5bef3fb138f15
  • 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 7 IoCs
    persistence
  • UAC bypass 3 TTPs 16 IoCs
    defense_evasiontrojan
  • Adds policy Run key to start application 2 TTPs 38 IoCs
    persistence
  • Disables RegEdit via registry modification 10 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 14 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 9 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 53 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 53 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 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpkkh4rwcm.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpkkh4rwcm.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1236
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\users\admin\appdata\local\temp\tmpkkh4rwcm.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:1992
      • C:\Users\Admin\AppData\Local\Temp\pnabmm.exe
        "C:\Users\Admin\AppData\Local\Temp\pnabmm.exe" "-c:\users\admin\appdata\local\temp\tmpkkh4rwcm.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:452
      • C:\Users\Admin\AppData\Local\Temp\pnabmm.exe
        "C:\Users\Admin\AppData\Local\Temp\pnabmm.exe" "-c:\users\admin\appdata\local\temp\tmpkkh4rwcm.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:2440
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\users\admin\appdata\local\temp\tmpkkh4rwcm.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:4160
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:1748
  • C:\Windows\rbankwnjyqtgmrgoxq.exe
    rbankwnjyqtgmrgoxq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1436
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\windows\rbankwnjyqtgmrgoxq.exe*."
      2⤵
      • Executes dropped EXE
      PID:2480
  • C:\Windows\pbcrqexvmglaipgqbwlx.exe
    pbcrqexvmglaipgqbwlx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1448
  • C:\Windows\irpbxiythyamrvjqy.exe
    irpbxiythyamrvjqy.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2740
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\windows\irpbxiythyamrvjqy.exe*."
      2⤵
      • Executes dropped EXE
      PID:3060
  • C:\Users\Admin\AppData\Local\Temp\rbankwnjyqtgmrgoxq.exe
    C:\Users\Admin\AppData\Local\Temp\rbankwnjyqtgmrgoxq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1716
  • C:\Users\Admin\AppData\Local\Temp\irpbxiythyamrvjqy.exe
    C:\Users\Admin\AppData\Local\Temp\irpbxiythyamrvjqy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3384
  • C:\Windows\ertjjysrjekajrjugcsfh.exe
    ertjjysrjekajrjugcsfh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4456
  • C:\Windows\bjgrmwlfsijuybou.exe
    bjgrmwlfsijuybou.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4808
  • C:\Users\Admin\AppData\Local\Temp\pbcrqexvmglaipgqbwlx.exe
    C:\Users\Admin\AppData\Local\Temp\pbcrqexvmglaipgqbwlx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3896
  • C:\Users\Admin\AppData\Local\Temp\ertjjysrjekajrjugcsfh.exe
    C:\Users\Admin\AppData\Local\Temp\ertjjysrjekajrjugcsfh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4976
  • C:\Windows\ertjjysrjekajrjugcsfh.exe
    ertjjysrjekajrjugcsfh.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4224
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\windows\ertjjysrjekajrjugcsfh.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:4924
  • C:\Users\Admin\AppData\Local\Temp\bjgrmwlfsijuybou.exe
    C:\Users\Admin\AppData\Local\Temp\bjgrmwlfsijuybou.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3384
  • C:\Windows\bjgrmwlfsijuybou.exe
    bjgrmwlfsijuybou.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4928
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\windows\bjgrmwlfsijuybou.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:1736
  • C:\Windows\irpbxiythyamrvjqy.exe
    irpbxiythyamrvjqy.exe
    1⤵
    • Executes dropped EXE
    PID:3432
  • C:\Windows\pbcrqexvmglaipgqbwlx.exe
    pbcrqexvmglaipgqbwlx.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2036
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\windows\pbcrqexvmglaipgqbwlx.exe*."
      2⤵
      • Executes dropped EXE
      PID:1828
  • C:\Windows\rbankwnjyqtgmrgoxq.exe
    rbankwnjyqtgmrgoxq.exe
    1⤵
    • Executes dropped EXE
    PID:4808
  • C:\Users\Admin\AppData\Local\Temp\cnnbzmebrkocjpfoysg.exe
    C:\Users\Admin\AppData\Local\Temp\cnnbzmebrkocjpfoysg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2736
  • C:\Windows\cnnbzmebrkocjpfoysg.exe
    cnnbzmebrkocjpfoysg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1728
  • C:\Windows\cnnbzmebrkocjpfoysg.exe
    cnnbzmebrkocjpfoysg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4456
    • C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
      "C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe" "c:\windows\cnnbzmebrkocjpfoysg.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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:3388

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

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        Downloads

        fxezeyxbyyjesfcsjkfxez.yxb
        • Path C:\Program Files (x86)\fxezeyxbyyjesfcsjkfxez.yxb
        • Size 272B
        • SHA256 e54645ed8a8837878b4a2e7501ca569189ce7413b3de0d9ec475d1b881bb8c46
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fxezeyxbyyjesfcsjkfxez.yxb
        • Path C:\Program Files (x86)\fxezeyxbyyjesfcsjkfxez.yxb
        • Size 272B
        • SHA256 99acb9a7c3d58a65e2b0c1f880e7cc499937ac1c3619b49b71c77981d48f9b30
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fxezeyxbyyjesfcsjkfxez.yxb
        • Path C:\Program Files (x86)\fxezeyxbyyjesfcsjkfxez.yxb
        • Size 272B
        • SHA256 97cb4fa9e8c3111ce0ecd16312bc001dece1c3fb147709cad1c386bebe9b1a2c
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        agfdlmoakqp.exe
        • Path C:\Users\Admin\AppData\Local\Temp\agfdlmoakqp.exe
        • Size 320KB
        • SHA256 c8c542ac3f6526d1501c2b9d6262bfa029a1ac0d9dd6b3c1965977abdd8bd126
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        pnabmm.exe
        • Path C:\Users\Admin\AppData\Local\Temp\pnabmm.exe
        • Size 712KB
        • SHA256 8ab79d730a4408755fc677b18adba8ac968f11f6eb31cceedb3c7b638a272d2d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fxezeyxbyyjesfcsjkfxez.yxb
        • Path C:\Users\Admin\AppData\Local\fxezeyxbyyjesfcsjkfxez.yxb
        • Size 272B
        • SHA256 ecf83e9294c525d6775c78ecaa9982d27c5d299a30309c4bd5d714c04303efb8
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        wzrxnscrzkgmljrsugmphndishpawcbzh.kwc
        • Path C:\Users\Admin\AppData\Local\wzrxnscrzkgmljrsugmphndishpawcbzh.kwc
        • Size 3KB
        • SHA256 aac440aa75779098327fd904d1ce4a76b6b10c450021dcc56fafcf17dec43bd8
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rbankwnjyqtgmrgoxq.exe
        • Path C:\Windows\SysWOW64\rbankwnjyqtgmrgoxq.exe
        • Size 532KB
        • SHA256 4579fb72623b0b912926a83c720918ec4ec1ad8a14a1aadc02b5bef3fb138f15
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download