Overview

overview

10

Static

static

3

tmpas_v4x38.exe

windows10-ltsc_2021-x64

10

tmpas_v4x38.exe

windows10-2004-x64

10

tmpas_v4x38.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    159s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    22/05/2026, 15:03

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General

  • Target
    tmpas_v4x38.exe
  • Size 564KB
  • Sample260522-sfagcahs71
  • SHA256 9af01475a31bd82f4dc99d8c82aeff77dee3b14093a710be608e32cad8eff8a5
  • 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 40 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 7 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 8 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 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 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpas_v4x38.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpas_v4x38.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4808
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\users\admin\appdata\local\temp\tmpas_v4x38.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:2760
      • C:\Users\Admin\AppData\Local\Temp\kuugkr.exe
        "C:\Users\Admin\AppData\Local\Temp\kuugkr.exe" "-C:\Users\Admin\AppData\Local\Temp\wqawkbscbexcirkc.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:2824
      • C:\Users\Admin\AppData\Local\Temp\kuugkr.exe
        "C:\Users\Admin\AppData\Local\Temp\kuugkr.exe" "-C:\Users\Admin\AppData\Local\Temp\wqawkbscbexcirkc.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:3640
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\users\admin\appdata\local\temp\tmpas_v4x38.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:1808
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4572
  • C:\Windows\dyjgvnfqquoublfyt.exe
    dyjgvnfqquoublfyt.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1200
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\windows\dyjgvnfqquoublfyt.exe*."
      2⤵
      • Executes dropped EXE
      PID:4164
  • C:\Windows\kiwwojesvczisfcywkkc.exe
    kiwwojesvczisfcywkkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:388
  • C:\Windows\miusibughmhowhcwse.exe
    miusibughmhowhcwse.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1072
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\windows\miusibughmhowhcwse.exe*."
      2⤵
      • Executes dropped EXE
      PID:1840
  • C:\Users\Admin\AppData\Local\Temp\kiwwojesvczisfcywkkc.exe
    C:\Users\Admin\AppData\Local\Temp\kiwwojesvczisfcywkkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3368
  • C:\Windows\xuhgxrlyagcktfbwtgf.exe
    xuhgxrlyagcktfbwtgf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:376
  • C:\Users\Admin\AppData\Local\Temp\dyjgvnfqquoublfyt.exe
    C:\Users\Admin\AppData\Local\Temp\dyjgvnfqquoublfyt.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1388
  • C:\Windows\zynohdzosayithfcbqrkg.exe
    zynohdzosayithfcbqrkg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1164
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\windows\zynohdzosayithfcbqrkg.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:4656
  • C:\Windows\wqawkbscbexcirkc.exe
    wqawkbscbexcirkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:832
  • C:\Users\Admin\AppData\Local\Temp\miusibughmhowhcwse.exe
    C:\Users\Admin\AppData\Local\Temp\miusibughmhowhcwse.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:964
  • C:\Users\Admin\AppData\Local\Temp\xuhgxrlyagcktfbwtgf.exe
    C:\Users\Admin\AppData\Local\Temp\xuhgxrlyagcktfbwtgf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5104
  • C:\Windows\dyjgvnfqquoublfyt.exe
    dyjgvnfqquoublfyt.exe
    1⤵
    • Executes dropped EXE
    PID:4524
  • C:\Users\Admin\AppData\Local\Temp\zynohdzosayithfcbqrkg.exe
    C:\Users\Admin\AppData\Local\Temp\zynohdzosayithfcbqrkg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1388
  • C:\Windows\wqawkbscbexcirkc.exe
    wqawkbscbexcirkc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3500
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\windows\wqawkbscbexcirkc.exe*."
      2⤵
      • Executes dropped EXE
      PID:5012
  • C:\Windows\miusibughmhowhcwse.exe
    miusibughmhowhcwse.exe
    1⤵
    • Executes dropped EXE
    PID:5020
  • C:\Windows\xuhgxrlyagcktfbwtgf.exe
    xuhgxrlyagcktfbwtgf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:792
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\windows\xuhgxrlyagcktfbwtgf.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:4812
  • C:\Users\Admin\AppData\Local\Temp\wqawkbscbexcirkc.exe
    C:\Users\Admin\AppData\Local\Temp\wqawkbscbexcirkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4164
  • C:\Windows\zynohdzosayithfcbqrkg.exe
    zynohdzosayithfcbqrkg.exe
    1⤵
    • Executes dropped EXE
    PID:2212
  • C:\Windows\kiwwojesvczisfcywkkc.exe
    kiwwojesvczisfcywkkc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
      "C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe" "c:\windows\kiwwojesvczisfcywkkc.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:2704

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

        bexczzzsamocrjlmpinkk.dlx
        • Path C:\Program Files (x86)\bexczzzsamocrjlmpinkk.dlx
        • Size 280B
        • SHA256 01078bf7e057f3edd760ea89085d83c11f9e4b0aca6bdb81edd922e2c9fca25e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        bexczzzsamocrjlmpinkk.dlx
        • Path C:\Program Files (x86)\bexczzzsamocrjlmpinkk.dlx
        • Size 280B
        • SHA256 4579388bd0c5b0a9d1d8c0ded6068d4c1a48eb703953168f56991ae0be269eef
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        bexczzzsamocrjlmpinkk.dlx
        • Path C:\Program Files (x86)\bexczzzsamocrjlmpinkk.dlx
        • Size 280B
        • SHA256 afd4c6598ceac8f8caf0c7b10713b0a8b84a9d1ffb44925c9edef952f84b2ead
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        bexczzzsamocrjlmpinkk.dlx
        • Path C:\Program Files (x86)\bexczzzsamocrjlmpinkk.dlx
        • Size 280B
        • SHA256 1e9b98d78e489573ad70d69d8391f074c0a81d0ded55ad165f05208c400b5111
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        kuugkr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\kuugkr.exe
        • Size 712KB
        • SHA256 af8d67d9e60fea74a882977d62bdad1c37893d4e6305a57b3f335d4817485e38
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        pjhvvwaoztr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\pjhvvwaoztr.exe
        • Size 320KB
        • SHA256 830e69219d34e08cff6bdb94f9a0a475dca1fbdc9e95002f8aff4a2ca689509c
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        bexczzzsamocrjlmpinkk.dlx
        • Path C:\Users\Admin\AppData\Local\bexczzzsamocrjlmpinkk.dlx
        • Size 280B
        • SHA256 6c076b0450159d4249caa52ec6f59da450ef9fcc3a54e300af811cae6ddaef7d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        wkoemximfcpooreqeiygrcgzwjiilyky.sal
        • Path C:\Users\Admin\AppData\Local\wkoemximfcpooreqeiygrcgzwjiilyky.sal
        • Size 4KB
        • SHA256 3de9b12ac6d13aed27a01025fb26b8f8a0bde84da89d26bb5da5d1f81ef06826
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        miusibughmhowhcwse.exe
        • Path C:\Windows\SysWOW64\miusibughmhowhcwse.exe
        • Size 564KB
        • SHA256 9af01475a31bd82f4dc99d8c82aeff77dee3b14093a710be608e32cad8eff8a5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        myaoudmo.bat
        • Path C:\myaoudmo.bat
        • Size 548KB
        • SHA256 62976f570942ae9b4080fe9aa94cd9f5c11db2f5a5e4a29a04938b5832008ddc
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download