Overview

overview

10

Static

static

3

tmpowu4zwln.exe

windows10-ltsc_2021-x64

10

tmpowu4zwln.exe

windows10-2004-x64

10

tmpowu4zwln.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    152s
  • 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, 14:20

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General

  • Target
    tmpowu4zwln.exe
  • Size 548KB
  • Sample260522-rnpessf121
  • SHA256 3a801906af230c0578e40c4ee18f2fe76ec90085acfc14c1fc95cb0b33b6ac54
  • 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 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 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 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 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 16 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\tmpowu4zwln.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpowu4zwln.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3052
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\users\admin\appdata\local\temp\tmpowu4zwln.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:5096
      • C:\Users\Admin\AppData\Local\Temp\djflt.exe
        "C:\Users\Admin\AppData\Local\Temp\djflt.exe" "-C:\Users\Admin\AppData\Local\Temp\arypickfslyvumgd.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:4060
      • C:\Users\Admin\AppData\Local\Temp\djflt.exe
        "C:\Users\Admin\AppData\Local\Temp\djflt.exe" "-C:\Users\Admin\AppData\Local\Temp\arypickfslyvumgd.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:1160
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\users\admin\appdata\local\temp\tmpowu4zwln.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:2320
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2624
  • C:\Windows\dzlhferrjhzbfcbdswsea.exe
    dzlhferrjhzbfcbdswsea.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2696
  • C:\Windows\arypickfslyvumgd.exe
    arypickfslyvumgd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2536
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\windows\arypickfslyvumgd.exe*."
      2⤵
      • Executes dropped EXE
      PID:5364
  • C:\Windows\qjslgcmjytihicyxjk.exe
    qjslgcmjytihicyxjk.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5916
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\windows\qjslgcmjytihicyxjk.exe*."
      2⤵
      • Executes dropped EXE
      PID:5348
  • C:\Users\Admin\AppData\Local\Temp\qjslgcmjytihicyxjk.exe
    C:\Users\Admin\AppData\Local\Temp\qjslgcmjytihicyxjk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4136
  • C:\Windows\arypickfslyvumgd.exe
    arypickfslyvumgd.exe
    1⤵
    • Executes dropped EXE
    PID:1672
  • C:\Users\Admin\AppData\Local\Temp\dzlhferrjhzbfcbdswsea.exe
    C:\Users\Admin\AppData\Local\Temp\dzlhferrjhzbfcbdswsea.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3768
  • C:\Windows\dzlhferrjhzbfcbdswsea.exe
    dzlhferrjhzbfcbdswsea.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3684
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\windows\dzlhferrjhzbfcbdswsea.exe*."
      2⤵
      • Executes dropped EXE
      PID:6140
  • C:\Windows\ojupmkwvmjabeayznqlw.exe
    ojupmkwvmjabeayznqlw.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5296
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\windows\ojupmkwvmjabeayznqlw.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:5612
  • C:\Users\Admin\AppData\Local\Temp\hzhztoxthbpnngbzk.exe
    C:\Users\Admin\AppData\Local\Temp\hzhztoxthbpnngbzk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4648
  • C:\Windows\qjslgcmjytihicyxjk.exe
    qjslgcmjytihicyxjk.exe
    1⤵
    • Executes dropped EXE
    PID:1484
  • C:\Users\Admin\AppData\Local\Temp\ojupmkwvmjabeayznqlw.exe
    C:\Users\Admin\AppData\Local\Temp\ojupmkwvmjabeayznqlw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2060
  • C:\Windows\bvfzvsdbrnddfaxxkmg.exe
    bvfzvsdbrnddfaxxkmg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5528
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\windows\bvfzvsdbrnddfaxxkmg.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:3408
  • C:\Windows\ojupmkwvmjabeayznqlw.exe
    ojupmkwvmjabeayznqlw.exe
    1⤵
    • Executes dropped EXE
    PID:560
  • C:\Users\Admin\AppData\Local\Temp\bvfzvsdbrnddfaxxkmg.exe
    C:\Users\Admin\AppData\Local\Temp\bvfzvsdbrnddfaxxkmg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5064
  • C:\Users\Admin\AppData\Local\Temp\arypickfslyvumgd.exe
    C:\Users\Admin\AppData\Local\Temp\arypickfslyvumgd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5100
  • C:\Windows\bvfzvsdbrnddfaxxkmg.exe
    bvfzvsdbrnddfaxxkmg.exe
    1⤵
    • Executes dropped EXE
    PID:3552
  • C:\Windows\hzhztoxthbpnngbzk.exe
    hzhztoxthbpnngbzk.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4428
    • C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
      "C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe" "c:\windows\hzhztoxthbpnngbzk.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:4896
  • C:\Windows\hzhztoxthbpnngbzk.exe
    hzhztoxthbpnngbzk.exe
    1⤵
    • Executes dropped EXE
    PID:2120

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

        djfltczjltvhvclxwkqmsajgqsa.ocj
        • Path C:\Program Files (x86)\djfltczjltvhvclxwkqmsajgqsa.ocj
        • Size 280B
        • SHA256 deeab495fe6f8d34706fb2401d6f8b0092048074dba28372645dc62d9f8476f3
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        djfltczjltvhvclxwkqmsajgqsa.ocj
        • Path C:\Program Files (x86)\djfltczjltvhvclxwkqmsajgqsa.ocj
        • Size 280B
        • SHA256 79896090f746a672cd7f99cd3fb2c85bb76e60b19e8bb07990fc6188b23d6083
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        djflt.exe
        • Path C:\Users\Admin\AppData\Local\Temp\djflt.exe
        • Size 712KB
        • SHA256 8615f16fb682e9e97943b67f854bcab202da00ae4e956bfdf41a9d6d2189bc48
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        sasmzoglckc.exe
        • Path C:\Users\Admin\AppData\Local\Temp\sasmzoglckc.exe
        • Size 320KB
        • SHA256 7952a438be4ba5a505722830683f45ac09e4097bc4eb93404e08ce18357c16a8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        arypickfslyvumgdnmdkbuowrexkhgyspzypwn.aid
        • Path C:\Users\Admin\AppData\Local\arypickfslyvumgdnmdkbuowrexkhgyspzypwn.aid
        • Size 4KB
        • SHA256 72849fadad57a6d009853915e31d595165ff3d3854daea7ce87d6f9b16f32358
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        djfltczjltvhvclxwkqmsajgqsa.ocj
        • Path C:\Users\Admin\AppData\Local\djfltczjltvhvclxwkqmsajgqsa.ocj
        • Size 280B
        • SHA256 f59083a786f8049ce003a5ae54705305a620371bf76bbbef161eb4b4ca63d046
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        qjslgcmjytihicyxjk.exe
        • Path C:\Windows\SysWOW64\qjslgcmjytihicyxjk.exe
        • Size 548KB
        • SHA256 3a801906af230c0578e40c4ee18f2fe76ec90085acfc14c1fc95cb0b33b6ac54
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download