Overview

overview

10

Static

static

3

tmpnjuz9f_o.exe

windows10-ltsc_2021-x64

10

tmpnjuz9f_o.exe

windows10-2004-x64

10

tmpnjuz9f_o.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, 02:57

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General

  • Target
    tmpnjuz9f_o.exe
  • Size 1016KB
  • Sample260602-dflgaadx2p
  • SHA256 f937d199612f75f129b1b8ffe0cbcb58cecd5b2b8975be1e0a1cfb4ea484e729
  • 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 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 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 10 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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 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 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpnjuz9f_o.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpnjuz9f_o.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4240
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\users\admin\appdata\local\temp\tmpnjuz9f_o.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:3892
      • C:\Users\Admin\AppData\Local\Temp\cjkky.exe
        "C:\Users\Admin\AppData\Local\Temp\cjkky.exe" "-C:\Users\Admin\AppData\Local\Temp\zrdonykcuhsanblm.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:1808
      • C:\Users\Admin\AppData\Local\Temp\cjkky.exe
        "C:\Users\Admin\AppData\Local\Temp\cjkky.exe" "-C:\Users\Admin\AppData\Local\Temp\zrdonykcuhsanblm.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:1356
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\users\admin\appdata\local\temp\tmpnjuz9f_o.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:384
  • C:\Windows\avkyaodytjxiypcgiqe.exe
    avkyaodytjxiypcgiqe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1268
  • C:\Users\Admin\AppData\Local\Temp\zrdonykcuhsanblm.exe
    C:\Users\Admin\AppData\Local\Temp\zrdonykcuhsanblm.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4952
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:1300
  • C:\Windows\njzorgwsofugxpdilujf.exe
    njzorgwsofugxpdilujf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:756
  • C:\Windows\zrdonykcuhsanblm.exe
    zrdonykcuhsanblm.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:936
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\zrdonykcuhsanblm.exe*."
      2⤵
      • Executes dropped EXE
      PID:4560
  • C:\Windows\gzmyykxqjxjsgvgii.exe
    gzmyykxqjxjsgvgii.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4720
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\gzmyykxqjxjsgvgii.exe*."
      2⤵
      • Executes dropped EXE
      PID:3796
  • C:\Windows\zrdonykcuhsanblm.exe
    zrdonykcuhsanblm.exe
    1⤵
    • Executes dropped EXE
    PID:4116
  • C:\Windows\czqgkaroldtgyrgmqaqne.exe
    czqgkaroldtgyrgmqaqne.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4236
  • C:\Users\Admin\AppData\Local\Temp\czqgkaroldtgyrgmqaqne.exe
    C:\Users\Admin\AppData\Local\Temp\czqgkaroldtgyrgmqaqne.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4692
  • C:\Users\Admin\AppData\Local\Temp\njzorgwsofugxpdilujf.exe
    C:\Users\Admin\AppData\Local\Temp\njzorgwsofugxpdilujf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1164
  • C:\Windows\avkyaodytjxiypcgiqe.exe
    avkyaodytjxiypcgiqe.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2164
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\avkyaodytjxiypcgiqe.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:1028
  • C:\Windows\gzmyykxqjxjsgvgii.exe
    gzmyykxqjxjsgvgii.exe
    1⤵
    • Executes dropped EXE
    PID:5044
  • C:\Windows\pjxklymgapcmbrdgho.exe
    pjxklymgapcmbrdgho.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4232
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\pjxklymgapcmbrdgho.exe*."
      2⤵
      • Executes dropped EXE
      PID:3972
  • C:\Windows\czqgkaroldtgyrgmqaqne.exe
    czqgkaroldtgyrgmqaqne.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4472
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\czqgkaroldtgyrgmqaqne.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:5008
  • C:\Windows\pjxklymgapcmbrdgho.exe
    pjxklymgapcmbrdgho.exe
    1⤵
    • Executes dropped EXE
    PID:1160
  • C:\Users\Admin\AppData\Local\Temp\avkyaodytjxiypcgiqe.exe
    C:\Users\Admin\AppData\Local\Temp\avkyaodytjxiypcgiqe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3992
  • C:\Users\Admin\AppData\Local\Temp\gzmyykxqjxjsgvgii.exe
    C:\Users\Admin\AppData\Local\Temp\gzmyykxqjxjsgvgii.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2084
  • C:\Windows\njzorgwsofugxpdilujf.exe
    njzorgwsofugxpdilujf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2192
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\njzorgwsofugxpdilujf.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:1084
  • C:\Users\Admin\AppData\Local\Temp\pjxklymgapcmbrdgho.exe
    C:\Users\Admin\AppData\Local\Temp\pjxklymgapcmbrdgho.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3344

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

        cjkkyyzgnppmorqguoovwwkklsz.bya
        • Path C:\Program Files (x86)\cjkkyyzgnppmorqguoovwwkklsz.bya
        • Size 280B
        • SHA256 32203392151ceb63ad415762a19f96f623890a385478aae387577c08f5e80133
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cjkky.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cjkky.exe
        • Size 740KB
        • SHA256 26eda552cf3849da61b2750860cc6e9173c8fbcece2b3f6db2edda72630269dc
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        jmudieyytwe.exe
        • Path C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
        • Size 320KB
        • SHA256 40622ac0f628d1d78061c4fdd4162d129051776f9d89ea460c34c2ad0f7115eb
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        cjkkyyzgnppmorqguoovwwkklsz.bya
        • Path C:\Users\Admin\AppData\Local\cjkkyyzgnppmorqguoovwwkklsz.bya
        • Size 280B
        • SHA256 c0addcc37a9d7292f5e8ed68d4e1b3a1c4fbf41f5889c07cb852d02388a99e7f
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        zrdonykcuhsanblmlqbtfqpamewjucpdnonsdv.src
        • Path C:\Users\Admin\AppData\Local\zrdonykcuhsanblmlqbtfqpamewjucpdnonsdv.src
        • Size 4KB
        • SHA256 6097e77d0123f3fb455e1df2d5c36b4e9e523ce609eb76ce589e5e8d2d16f6cd
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        pjxklymgapcmbrdgho.exe
        • Path C:\Windows\SysWOW64\pjxklymgapcmbrdgho.exe
        • Size 1016KB
        • SHA256 f937d199612f75f129b1b8ffe0cbcb58cecd5b2b8975be1e0a1cfb4ea484e729
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download