Overview

overview

10

Static

static

3

tmpzu_3jud5.exe

windows10-ltsc_2021-x64

10

tmpzu_3jud5.exe

windows10-2004-x64

10

tmpzu_3jud5.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    22/05/2026, 14:14

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General

  • Target
    tmpzu_3jud5.exe
  • Size 1016KB
  • Sample260522-rkfcqafz21
  • SHA256 19fb2733fd679e81dbbd1e1624b2aa51496478810766901ee5a26242605fa64d
  • 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 34 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 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\tmpzu_3jud5.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpzu_3jud5.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5860
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\users\admin\appdata\local\temp\tmpzu_3jud5.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:5452
      • C:\Users\Admin\AppData\Local\Temp\aegny.exe
        "C:\Users\Admin\AppData\Local\Temp\aegny.exe" "-C:\Users\Admin\AppData\Local\Temp\xmzrnbmcthdamcnp.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:4640
      • C:\Users\Admin\AppData\Local\Temp\aegny.exe
        "C:\Users\Admin\AppData\Local\Temp\aegny.exe" "-C:\Users\Admin\AppData\Local\Temp\xmzrnbmcthdamcnp.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:4664
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\users\admin\appdata\local\temp\tmpzu_3jud5.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:592
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4028
  • C:\Windows\euibynzqixusfwilu.exe
    euibynzqixusfwilu.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3660
  • C:\Windows\yqgbarfysjiixqejuzc.exe
    yqgbarfysjiixqejuzc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5684
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\yqgbarfysjiixqejuzc.exe*."
      2⤵
      • Executes dropped EXE
      PID:964
  • C:\Users\Admin\AppData\Local\Temp\levrrjysnffgwqflxdha.exe
    C:\Users\Admin\AppData\Local\Temp\levrrjysnffgwqflxdha.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4472
  • C:\Windows\netnlbogzpnmasfjtx.exe
    netnlbogzpnmasfjtx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4688
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\netnlbogzpnmasfjtx.exe*."
      2⤵
      • Executes dropped EXE
      PID:6008
  • C:\Users\Admin\AppData\Local\Temp\euibynzqixusfwilu.exe
    C:\Users\Admin\AppData\Local\Temp\euibynzqixusfwilu.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:6080
  • C:\Windows\yqgbarfysjiixqejuzc.exe
    yqgbarfysjiixqejuzc.exe
    1⤵
    • Executes dropped EXE
    PID:3844
  • C:\Windows\levrrjysnffgwqflxdha.exe
    levrrjysnffgwqflxdha.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2112
  • C:\Windows\aumjkdtokdegxsipcjoia.exe
    aumjkdtokdegxsipcjoia.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3004
  • C:\Users\Admin\AppData\Local\Temp\netnlbogzpnmasfjtx.exe
    C:\Users\Admin\AppData\Local\Temp\netnlbogzpnmasfjtx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:6048
  • C:\Users\Admin\AppData\Local\Temp\aumjkdtokdegxsipcjoia.exe
    C:\Users\Admin\AppData\Local\Temp\aumjkdtokdegxsipcjoia.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2376
  • C:\Windows\aumjkdtokdegxsipcjoia.exe
    aumjkdtokdegxsipcjoia.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:340
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\aumjkdtokdegxsipcjoia.exe*."
      2⤵
      • Executes dropped EXE
      PID:1172
  • C:\Windows\levrrjysnffgwqflxdha.exe
    levrrjysnffgwqflxdha.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4084
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\levrrjysnffgwqflxdha.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:4728
  • C:\Users\Admin\AppData\Local\Temp\yqgbarfysjiixqejuzc.exe
    C:\Users\Admin\AppData\Local\Temp\yqgbarfysjiixqejuzc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5712
  • C:\Windows\euibynzqixusfwilu.exe
    euibynzqixusfwilu.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1404
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\euibynzqixusfwilu.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:4660
  • C:\Windows\xmzrnbmcthdamcnp.exe
    xmzrnbmcthdamcnp.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2320
    • C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
      "C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe" "c:\windows\xmzrnbmcthdamcnp.exe*."
      2⤵
      • Executes dropped EXE
      PID:2672
  • C:\Windows\netnlbogzpnmasfjtx.exe
    netnlbogzpnmasfjtx.exe
    1⤵
    • Executes dropped EXE
    PID:4460
  • C:\Users\Admin\AppData\Local\Temp\xmzrnbmcthdamcnp.exe
    C:\Users\Admin\AppData\Local\Temp\xmzrnbmcthdamcnp.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1852
  • C:\Windows\xmzrnbmcthdamcnp.exe
    xmzrnbmcthdamcnp.exe
    1⤵
    • Executes dropped EXE
    PID:2936

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

        System Information Discovery

        2
        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

        cawxcztsspuavuozqbkie.khb
        • Path C:\Program Files (x86)\cawxcztsspuavuozqbkie.khb
        • Size 280B
        • SHA256 dfc340312492f43bfdaea87ac7ad4f8a88635f5fad92b8489fe2ebbd55f78c92
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cawxcztsspuavuozqbkie.khb
        • Path C:\Program Files (x86)\cawxcztsspuavuozqbkie.khb
        • Size 280B
        • SHA256 0a586ab7331783974ad43a306a31427231b422d6acd0e28a90beb0a073830059
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cawxcztsspuavuozqbkie.khb
        • Path C:\Program Files (x86)\cawxcztsspuavuozqbkie.khb
        • Size 280B
        • SHA256 86f654b8e073cb93b7729e1bc9e62dbd3725abf0265803234b22c1ce3d5898eb
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cawxcztsspuavuozqbkie.khb
        • Path C:\Program Files (x86)\cawxcztsspuavuozqbkie.khb
        • Size 280B
        • SHA256 adf9663d2ce65f5eb5143b21492f0e2c5b7ffee92b3a182f16f0c8a55acb991e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        aegny.exe
        • Path C:\Users\Admin\AppData\Local\Temp\aegny.exe
        • Size 712KB
        • SHA256 393e517154abcff616f29ecb9ff2a4c502543e83ba5d0d48ed31d7198299ae8c
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        umtekhkhewd.exe
        • Path C:\Users\Admin\AppData\Local\Temp\umtekhkhewd.exe
        • Size 320KB
        • SHA256 51ebecdb309c93b46294fadad6789da93c1f9173b6eb8c177a28728cc8295db5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        cawxcztsspuavuozqbkie.khb
        • Path C:\Users\Admin\AppData\Local\cawxcztsspuavuozqbkie.khb
        • Size 280B
        • SHA256 631cf23fb3bef5eb69bafe75550df360c230b63f9a174f527da739fce1526851
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        xgnzpxcmxfvmschdfbvelxnvakvdtkqa.bdz
        • Path C:\Users\Admin\AppData\Local\xgnzpxcmxfvmschdfbvelxnvakvdtkqa.bdz
        • Size 4KB
        • SHA256 faeb8663a22b6485e0dd1fa1f9d69f91c9d72a2f6f9dd46af86f1948f4876205
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        netnlbogzpnmasfjtx.exe
        • Path C:\Windows\SysWOW64\netnlbogzpnmasfjtx.exe
        • Size 1016KB
        • SHA256 19fb2733fd679e81dbbd1e1624b2aa51496478810766901ee5a26242605fa64d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        sckxoxdoaja.bat
        • Path C:\sckxoxdoaja.bat
        • Size 640KB
        • SHA256 418a0e3244f5d0f2d74b9a0e3f1d2152875bad449daeb846ac1582a7b25fd048
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download