Overview

overview

10

Static

static

3

tmpkeznofoz.exe

windows10-ltsc_2021-x64

10

tmpkeznofoz.exe

windows10-2004-x64

10

tmpkeznofoz.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, 14:11

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General

  • Target
    tmpkeznofoz.exe
  • Size 1016KB
  • Sample260522-rhb8aadv3r
  • SHA256 8a3725ef19fa5684dca253f2648f166970b90963ac8ecf9b805974abdec1ec18
  • 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 36 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 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 42 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpkeznofoz.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpkeznofoz.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:400
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\users\admin\appdata\local\temp\tmpkeznofoz.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:4344
      • C:\Users\Admin\AppData\Local\Temp\wfmrv.exe
        "C:\Users\Admin\AppData\Local\Temp\wfmrv.exe" "-C:\Users\Admin\AppData\Local\Temp\tnfvkxojqjrcqeah.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:4288
      • C:\Users\Admin\AppData\Local\Temp\wfmrv.exe
        "C:\Users\Admin\AppData\Local\Temp\wfmrv.exe" "-C:\Users\Admin\AppData\Local\Temp\tnfvkxojqjrcqeah.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:4460
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\users\admin\appdata\local\temp\tmpkeznofoz.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:668
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4712
  • C:\Windows\wvsnhzvvhfsibuvhiwkjg.exe
    wvsnhzvvhfsibuvhiwkjg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4128
  • C:\Users\Admin\AppData\Local\Temp\jfzrixqnwrboeusbzk.exe
    C:\Users\Admin\AppData\Local\Temp\jfzrixqnwrboeusbzk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2540
  • C:\Windows\avofvjbxfziujyvda.exe
    avofvjbxfziujyvda.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3028
  • C:\Windows\jfzrixqnwrboeusbzk.exe
    jfzrixqnwrboeusbzk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:360
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\jfzrixqnwrboeusbzk.exe*."
      2⤵
      • Executes dropped EXE
      PID:704
  • C:\Windows\tnfvkxojqjrcqeah.exe
    tnfvkxojqjrcqeah.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2624
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\tnfvkxojqjrcqeah.exe*."
      2⤵
      • Executes dropped EXE
      PID:1192
  • C:\Windows\hfbvofazkhtiassddqdb.exe
    hfbvofazkhtiassddqdb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4436
  • C:\Windows\avofvjbxfziujyvda.exe
    avofvjbxfziujyvda.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2988
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\avofvjbxfziujyvda.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:4968
  • C:\Users\Admin\AppData\Local\Temp\wvsnhzvvhfsibuvhiwkjg.exe
    C:\Users\Admin\AppData\Local\Temp\wvsnhzvvhfsibuvhiwkjg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1272
  • C:\Windows\wvsnhzvvhfsibuvhiwkjg.exe
    wvsnhzvvhfsibuvhiwkjg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3908
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\wvsnhzvvhfsibuvhiwkjg.exe*."
      2⤵
      • Executes dropped EXE
      PID:1688
  • C:\Windows\urmfxnhfplwkbsrbamy.exe
    urmfxnhfplwkbsrbamy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2176
  • C:\Windows\jfzrixqnwrboeusbzk.exe
    jfzrixqnwrboeusbzk.exe
    1⤵
    • Executes dropped EXE
    PID:2424
  • C:\Windows\hfbvofazkhtiassddqdb.exe
    hfbvofazkhtiassddqdb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4624
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\hfbvofazkhtiassddqdb.exe*."
      2⤵
      • Executes dropped EXE
      PID:1996
  • C:\Users\Admin\AppData\Local\Temp\avofvjbxfziujyvda.exe
    C:\Users\Admin\AppData\Local\Temp\avofvjbxfziujyvda.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2452
  • C:\Users\Admin\AppData\Local\Temp\urmfxnhfplwkbsrbamy.exe
    C:\Users\Admin\AppData\Local\Temp\urmfxnhfplwkbsrbamy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1492
  • C:\Windows\tnfvkxojqjrcqeah.exe
    tnfvkxojqjrcqeah.exe
    1⤵
    • Executes dropped EXE
    PID:1596
  • C:\Windows\urmfxnhfplwkbsrbamy.exe
    urmfxnhfplwkbsrbamy.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3076
    • C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
      "C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe" "c:\windows\urmfxnhfplwkbsrbamy.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:1216
  • C:\Users\Admin\AppData\Local\Temp\hfbvofazkhtiassddqdb.exe
    C:\Users\Admin\AppData\Local\Temp\hfbvofazkhtiassddqdb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5116
  • C:\Users\Admin\AppData\Local\Temp\tnfvkxojqjrcqeah.exe
    C:\Users\Admin\AppData\Local\Temp\tnfvkxojqjrcqeah.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3352

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

        nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Path C:\Program Files (x86)\nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Size 280B
        • SHA256 1ca608310b2c4cab193fc0cbb76553dc228b03fab56564a2e931d1e419a9e5c5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Path C:\Program Files (x86)\nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Size 280B
        • SHA256 fff7fcb00a0261d86491498ec5c46d2439062b605dea28a6fa876760c3e364db
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Path C:\Program Files (x86)\nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Size 280B
        • SHA256 68f3c9c970abdacb6234aeabfb3b96a9f9366bdf7b878a48016cd25100262bee
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ioxgxzqusyh.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ioxgxzqusyh.exe
        • Size 320KB
        • SHA256 598d58c7d4b57fa9f6153cd8f3e287c4ac2a1282364070618c6f0ef743a698d5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        wfmrv.exe
        • Path C:\Users\Admin\AppData\Local\Temp\wfmrv.exe
        • Size 700KB
        • SHA256 06cede87f4d8756703e2c05c74a744989473fa5c3b24b6e0d701693d0ca16f0a
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Path C:\Users\Admin\AppData\Local\nvbfijoxszvuwyidnkhpvzcdir.tpo
        • Size 280B
        • SHA256 7e85ad6865adced8fad60c21113eb7a481f055a9e1f9029af16162117a623046
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ohynbndxdvcmzmhniqyrixlxnhnfmwjwrxsai.shv
        • Path C:\Users\Admin\AppData\Local\ohynbndxdvcmzmhniqyrixlxnhnfmwjwrxsai.shv
        • Size 4KB
        • SHA256 7fc85c247135fa3d2e9853a241bbe43e76f88891e68d012e2f64b90c6d6b4c38
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        jfzrixqnwrboeusbzk.exe
        • Path C:\Windows\SysWOW64\jfzrixqnwrboeusbzk.exe
        • Size 1016KB
        • SHA256 8a3725ef19fa5684dca253f2648f166970b90963ac8ecf9b805974abdec1ec18
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download