Overview

overview

10

Static

static

3

tmpu55txez0.exe

windows10-ltsc_2021-x64

10

tmpu55txez0.exe

windows10-2004-x64

10

tmpu55txez0.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    145s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    02/06/2026, 03:53

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General

  • Target
    tmpu55txez0.exe
  • Size 560KB
  • Sample260602-efngbaex2m
  • SHA256 717c2978702de3a7f235ab5c1de7bcb7a2519ec1bdf366a9e13c46f12485fd5d
  • 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
  • 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 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\tmpu55txez0.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpu55txez0.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4920
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\users\admin\appdata\local\temp\tmpu55txez0.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:4640
      • C:\Users\Admin\AppData\Local\Temp\mrugno.exe
        "C:\Users\Admin\AppData\Local\Temp\mrugno.exe" "-C:\Users\Admin\AppData\Local\Temp\ynawnyrhwhwpsmkx.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:2184
      • C:\Users\Admin\AppData\Local\Temp\mrugno.exe
        "C:\Users\Admin\AppData\Local\Temp\mrugno.exe" "-C:\Users\Admin\AppData\Local\Temp\ynawnyrhwhwpsmkx.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:2172
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\users\admin\appdata\local\temp\tmpu55txez0.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:1548
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:992
  • C:\Windows\bvnokaytndxvdcfxlipjb.exe
    bvnokaytndxvdcfxlipjb.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3456
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\bvnokaytndxvdcfxlipjb.exe*."
      2⤵
      • Executes dropped EXE
      PID:136
  • C:\Windows\ynawnyrhwhwpsmkx.exe
    ynawnyrhwhwpsmkx.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1572
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\ynawnyrhwhwpsmkx.exe*."
      2⤵
      • Executes dropped EXE
      PID:4460
  • C:\Users\Admin\AppData\Local\Temp\zrhgaokdvjbxdabrdyd.exe
    C:\Users\Admin\AppData\Local\Temp\zrhgaokdvjbxdabrdyd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5028
  • C:\Windows\bvnokaytndxvdcfxlipjb.exe
    bvnokaytndxvdcfxlipjb.exe
    1⤵
    • Executes dropped EXE
    PID:2440
  • C:\Windows\ofuslytlcpgbgccrcw.exe
    ofuslytlcpgbgccrcw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4076
  • C:\Users\Admin\AppData\Local\Temp\ofuslytlcpgbgccrcw.exe
    C:\Users\Admin\AppData\Local\Temp\ofuslytlcpgbgccrcw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:412
  • C:\Windows\mfwwrgdxqfyvcactgcib.exe
    mfwwrgdxqfyvcactgcib.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:864
  • C:\Windows\zrhgaokdvjbxdabrdyd.exe
    zrhgaokdvjbxdabrdyd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3660
  • C:\Windows\ofuslytlcpgbgccrcw.exe
    ofuslytlcpgbgccrcw.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4000
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\ofuslytlcpgbgccrcw.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:3756
  • C:\Windows\fvjgykevlxnhlgftd.exe
    fvjgykevlxnhlgftd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4928
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\fvjgykevlxnhlgftd.exe*."
      2⤵
      • Executes dropped EXE
      PID:2920
  • C:\Windows\zrhgaokdvjbxdabrdyd.exe
    zrhgaokdvjbxdabrdyd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2264
    • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
      "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\zrhgaokdvjbxdabrdyd.exe*."
      2⤵
      • Executes dropped EXE
      PID:4636
  • C:\Users\Admin\AppData\Local\Temp\ynawnyrhwhwpsmkx.exe
    C:\Users\Admin\AppData\Local\Temp\ynawnyrhwhwpsmkx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3772
  • C:\Windows\System32\Conhost.exe
    \??\C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
    1⤵
      PID:136
    • C:\Windows\fvjgykevlxnhlgftd.exe
      fvjgykevlxnhlgftd.exe
      1⤵
      • Executes dropped EXE
      PID:3016
    • C:\Users\Admin\AppData\Local\Temp\bvnokaytndxvdcfxlipjb.exe
      C:\Users\Admin\AppData\Local\Temp\bvnokaytndxvdcfxlipjb.exe
      1⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:3736
    • C:\Windows\ynawnyrhwhwpsmkx.exe
      ynawnyrhwhwpsmkx.exe
      1⤵
      • Executes dropped EXE
      PID:4016
    • C:\Windows\mfwwrgdxqfyvcactgcib.exe
      mfwwrgdxqfyvcactgcib.exe .
      1⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:412
      • C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
        "C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe" "c:\windows\mfwwrgdxqfyvcactgcib.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:688
    • C:\Users\Admin\AppData\Local\Temp\fvjgykevlxnhlgftd.exe
      C:\Users\Admin\AppData\Local\Temp\fvjgykevlxnhlgftd.exe
      1⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:2504
    • C:\Users\Admin\AppData\Local\Temp\mfwwrgdxqfyvcactgcib.exe
      C:\Users\Admin\AppData\Local\Temp\mfwwrgdxqfyvcactgcib.exe
      1⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:756

    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

          System Information Discovery

          2
          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

          mrugno.exe
          • Path C:\Users\Admin\AppData\Local\Temp\mrugno.exe
          • Size 716KB
          • SHA256 c0336b7bf260a1a502f87e248f6f6071021b7924f57c738367f4cb0db0404ae4
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          nbzohptgxlj.exe
          • Path C:\Users\Admin\AppData\Local\Temp\nbzohptgxlj.exe
          • Size 320KB
          • SHA256 ceca5fba3d139fe753b2138443bc26a3c7d1d368ef16b8dad2f569c3df199324
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          cbyefaddcxwzmqyvoqcbye.add
          • Path C:\Users\Admin\AppData\Local\cbyefaddcxwzmqyvoqcbye.add
          • Size 280B
          • SHA256 cce50432b79b87f27fcee033eb84354127990cf5cb5da3a64d58ecfc981825af
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          tdlcouitdjthfunvzmjtbsekyjtzjxvkd.pcz
          • Path C:\Users\Admin\AppData\Local\tdlcouitdjthfunvzmjtbsekyjtzjxvkd.pcz
          • Size 4KB
          • SHA256 14e9f37976e4bb28aefa2301a6ea8a52088c40e3d9cc6c6d4d1592a85798117d
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          ofuslytlcpgbgccrcw.exe
          • Path C:\Windows\SysWOW64\ofuslytlcpgbgccrcw.exe
          • Size 560KB
          • SHA256 717c2978702de3a7f235ab5c1de7bcb7a2519ec1bdf366a9e13c46f12485fd5d
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download