Overview

overview

10

Static

static

3

tmpjbiratrl.exe

windows10-ltsc_2021-x64

10

tmpjbiratrl.exe

windows10-2004-x64

10

tmpjbiratrl.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, 14:35

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General

  • Target
    tmpjbiratrl.exe
  • Size 1016KB
  • Sample260522-rxzbcsd16m
  • SHA256 38dd400b380fad264dcfce3a49e1e3bac252db96338e11d6c7e0d4d1e696b6f2
  • 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
  • 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 13 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 17 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\tmpjbiratrl.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpjbiratrl.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3068
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpjbiratrl.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:3860
      • C:\Users\Admin\AppData\Local\Temp\gsackq.exe
        "C:\Users\Admin\AppData\Local\Temp\gsackq.exe" "-C:\Users\Admin\AppData\Local\Temp\sogskapgtiworwiw.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:1220
      • C:\Users\Admin\AppData\Local\Temp\gsackq.exe
        "C:\Users\Admin\AppData\Local\Temp\gsackq.exe" "-C:\Users\Admin\AppData\Local\Temp\sogskapgtiworwiw.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:3436
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\users\admin\appdata\local\temp\tmpjbiratrl.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:1404
  • C:\Windows\sogskapgtiworwiw.exe
    sogskapgtiworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4384
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2848
  • C:\Windows\ggcsoibwngyubkasuqcc.exe
    ggcsoibwngyubkasuqcc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:840
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\ggcsoibwngyubkasuqcc.exe*."
      2⤵
      • Executes dropped EXE
      PID:2196
  • C:\Windows\igaoiarkzqgafmaqqk.exe
    igaoiarkzqgafmaqqk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2012
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\igaoiarkzqgafmaqqk.exe*."
      2⤵
      • Executes dropped EXE
      PID:3972
  • C:\Users\Admin\AppData\Local\Temp\zwpcvmcuiyngkqdsr.exe
    C:\Users\Admin\AppData\Local\Temp\zwpcvmcuiyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3524
  • C:\Users\Admin\AppData\Local\Temp\tsncxqicskbwckzqrmx.exe
    C:\Users\Admin\AppData\Local\Temp\tsncxqicskbwckzqrmx.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3040
  • C:\Windows\ggcsoibwngyubkasuqcc.exe
    ggcsoibwngyubkasuqcc.exe
    1⤵
    • Executes dropped EXE
    PID:3384
  • C:\Windows\sogskapgtiworwiw.exe
    sogskapgtiworwiw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4476
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\sogskapgtiworwiw.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:1728
  • C:\Windows\zwpcvmcuiyngkqdsr.exe
    zwpcvmcuiyngkqdsr.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:388
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\zwpcvmcuiyngkqdsr.exe*."
      2⤵
      • Executes dropped EXE
      PID:1668
  • C:\Windows\zwpcvmcuiyngkqdsr.exe
    zwpcvmcuiyngkqdsr.exe
    1⤵
    • Executes dropped EXE
    PID:4552
  • C:\Windows\tsncxqicskbwckzqrmx.exe
    tsncxqicskbwckzqrmx.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4196
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\tsncxqicskbwckzqrmx.exe*."
      2⤵
      • Executes dropped EXE
      PID:224
  • C:\Windows\vwtkhcwskexucmdwzwjkh.exe
    vwtkhcwskexucmdwzwjkh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1692
  • C:\Windows\tsncxqicskbwckzqrmx.exe
    tsncxqicskbwckzqrmx.exe
    1⤵
    • Executes dropped EXE
    PID:416
  • C:\Users\Admin\AppData\Local\Temp\sogskapgtiworwiw.exe
    C:\Users\Admin\AppData\Local\Temp\sogskapgtiworwiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2268
  • C:\Users\Admin\AppData\Local\Temp\ggcsoibwngyubkasuqcc.exe
    C:\Users\Admin\AppData\Local\Temp\ggcsoibwngyubkasuqcc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2356
  • C:\Windows\vwtkhcwskexucmdwzwjkh.exe
    vwtkhcwskexucmdwzwjkh.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2872
    • C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
      "C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe" "c:\windows\vwtkhcwskexucmdwzwjkh.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:3200
  • C:\Users\Admin\AppData\Local\Temp\igaoiarkzqgafmaqqk.exe
    C:\Users\Admin\AppData\Local\Temp\igaoiarkzqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:648
  • C:\Users\Admin\AppData\Local\Temp\vwtkhcwskexucmdwzwjkh.exe
    C:\Users\Admin\AppData\Local\Temp\vwtkhcwskexucmdwzwjkh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1476
  • C:\Windows\igaoiarkzqgafmaqqk.exe
    igaoiarkzqgafmaqqk.exe
    1⤵
    • Executes dropped EXE
    PID:456

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

        xehehiikiihkyolktwpwzwz.aca
        • Path C:\Program Files (x86)\xehehiikiihkyolktwpwzwz.aca
        • Size 280B
        • SHA256 1bb62148c5af33dc6e4407984f76c852ff60aca28261467e9b739dc5910fd933
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        xehehiikiihkyolktwpwzwz.aca
        • Path C:\Program Files (x86)\xehehiikiihkyolktwpwzwz.aca
        • Size 280B
        • SHA256 e7d60939446d021b1d61778ee73bfdf090cbdc606fa41f1ebc8ba027314506a5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        xehehiikiihkyolktwpwzwz.aca
        • Path C:\Program Files (x86)\xehehiikiihkyolktwpwzwz.aca
        • Size 280B
        • SHA256 d3c550936b7941165999b42f22cd173c4af6bf60e099e3c64f742de36add5f74
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gsackq.exe
        • Path C:\Users\Admin\AppData\Local\Temp\gsackq.exe
        • Size 724KB
        • SHA256 22bbefb40a36a0fcb1bc08444b618ed0765a4c99cc0403972e8b985678402511
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        nayyfohuxki.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nayyfohuxki.exe
        • Size 320KB
        • SHA256 faa0b47eb5eaad4fdb152a68ce0f48ac2d54b866aed4a34d227a9b91251f61a7
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        kcqymyjwfqaonowgaoskygugrenyiwvweo.was
        • Path C:\Users\Admin\AppData\Local\kcqymyjwfqaonowgaoskygugrenyiwvweo.was
        • Size 4KB
        • SHA256 b090ac7bffe0a6a92d6ca2bde45c7abca3cfb24ac3b9dff394eb082e750742bd
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        xehehiikiihkyolktwpwzwz.aca
        • Path C:\Users\Admin\AppData\Local\xehehiikiihkyolktwpwzwz.aca
        • Size 280B
        • SHA256 e3345cd79abe9ddc3e399f86e7e103fbd6be8ec94bff30f325134689dc83b70e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        igaoiarkzqgafmaqqk.exe
        • Path C:\Windows\SysWOW64\igaoiarkzqgafmaqqk.exe
        • Size 1016KB
        • SHA256 38dd400b380fad264dcfce3a49e1e3bac252db96338e11d6c7e0d4d1e696b6f2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download