Overview

overview

10

Static

static

3

tmpybvsv0s1.exe

windows10-ltsc_2021-x64

10

tmpybvsv0s1.exe

windows10-2004-x64

10

tmpybvsv0s1.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    02/06/2026, 02:44

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General

  • Target
    tmpybvsv0s1.exe
  • Size 548KB
  • Sample260602-c8a1kscs2s
  • 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 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 7 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 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\tmpybvsv0s1.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpybvsv0s1.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2064
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\users\admin\appdata\local\temp\tmpybvsv0s1.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:3828
      • C:\Users\Admin\AppData\Local\Temp\yjqpchm.exe
        "C:\Users\Admin\AppData\Local\Temp\yjqpchm.exe" "-C:\Users\Admin\AppData\Local\Temp\xrhplznbsjlasrsv.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:1944
      • C:\Users\Admin\AppData\Local\Temp\yjqpchm.exe
        "C:\Users\Admin\AppData\Local\Temp\yjqpchm.exe" "-C:\Users\Admin\AppData\Local\Temp\xrhplznbsjlasrsv.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:3912
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\users\admin\appdata\local\temp\tmpybvsv0s1.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\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:404
  • C:\Windows\njbljzpfyrvmghkpvh.exe
    njbljzpfyrvmghkpvh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3904
  • C:\Windows\yvozypgxrlqidfjpwjc.exe
    yvozypgxrlqidfjpwjc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3064
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\yvozypgxrlqidfjpwjc.exe*."
      2⤵
      • Executes dropped EXE
      PID:3364
  • C:\Users\Admin\AppData\Local\Temp\yvozypgxrlqidfjpwjc.exe
    C:\Users\Admin\AppData\Local\Temp\yvozypgxrlqidfjpwjc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4400
  • C:\Windows\ezqzwlaphzcsllnrw.exe
    ezqzwlaphzcsllnrw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2816
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\ezqzwlaphzcsllnrw.exe*."
      2⤵
      • Executes dropped EXE
      PID:4196
  • C:\Users\Admin\AppData\Local\Temp\ezqzwlaphzcsllnrw.exe
    C:\Users\Admin\AppData\Local\Temp\ezqzwlaphzcsllnrw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3632
  • C:\Windows\ezqzwlaphzcsllnrw.exe
    ezqzwlaphzcsllnrw.exe
    1⤵
    • Executes dropped EXE
    PID:4100
  • C:\Windows\xrhplznbsjlasrsv.exe
    xrhplznbsjlasrsv.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1748
  • C:\Windows\njbljzpfyrvmghkpvh.exe
    njbljzpfyrvmghkpvh.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4356
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\njbljzpfyrvmghkpvh.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:3068
  • C:\Users\Admin\AppData\Local\Temp\xrhplznbsjlasrsv.exe
    C:\Users\Admin\AppData\Local\Temp\xrhplznbsjlasrsv.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4900
  • C:\Windows\ljdpphzrmhngcfkrznhf.exe
    ljdpphzrmhngcfkrznhf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4052
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\ljdpphzrmhngcfkrznhf.exe*."
      2⤵
      • Executes dropped EXE
      PID:3084
  • C:\Windows\ljdpphzrmhngcfkrznhf.exe
    ljdpphzrmhngcfkrznhf.exe
    1⤵
    • Executes dropped EXE
    PID:5060
  • C:\Users\Admin\AppData\Local\Temp\ljdpphzrmhngcfkrznhf.exe
    C:\Users\Admin\AppData\Local\Temp\ljdpphzrmhngcfkrznhf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4260
  • C:\Windows\yvozypgxrlqidfjpwjc.exe
    yvozypgxrlqidfjpwjc.exe
    1⤵
    • Executes dropped EXE
    PID:2660
  • C:\Windows\azuhibunjfmgdhnvetoni.exe
    azuhibunjfmgdhnvetoni.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:724
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\azuhibunjfmgdhnvetoni.exe*."
      2⤵
      • Executes dropped EXE
      PID:1916
  • C:\Users\Admin\AppData\Local\Temp\njbljzpfyrvmghkpvh.exe
    C:\Users\Admin\AppData\Local\Temp\njbljzpfyrvmghkpvh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4360
  • C:\Windows\azuhibunjfmgdhnvetoni.exe
    azuhibunjfmgdhnvetoni.exe
    1⤵
    • Executes dropped EXE
    PID:3140
  • C:\Users\Admin\AppData\Local\Temp\azuhibunjfmgdhnvetoni.exe
    C:\Users\Admin\AppData\Local\Temp\azuhibunjfmgdhnvetoni.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3176
  • C:\Windows\xrhplznbsjlasrsv.exe
    xrhplznbsjlasrsv.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2108
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\xrhplznbsjlasrsv.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:1280

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

        Loading Replay Monitor...

        Downloads

        flnhppppsvjkozmbrnpvxrzz.zcf
        • Path C:\Program Files (x86)\flnhppppsvjkozmbrnpvxrzz.zcf
        • Size 280B
        • SHA256 9f02d0a1508b92908991ae69b52fd89a97f30af052b66c9ff60e01ce28f809a5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        flnhppppsvjkozmbrnpvxrzz.zcf
        • Path C:\Program Files (x86)\flnhppppsvjkozmbrnpvxrzz.zcf
        • Size 280B
        • SHA256 c9a301e15ca88b754d5f8ea166d310857d1660d940feda9a1dfe7bd3b1c8124b
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cmztpnmrmwj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
        • Size 320KB
        • SHA256 97ae3b97912b8d638f162c3838a72ac30deb5136eae9c4895f1bd490144cee2f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        yjqpchm.exe
        • Path C:\Users\Admin\AppData\Local\Temp\yjqpchm.exe
        • Size 724KB
        • SHA256 e347caf7389f7df0a25a1b21488844c198f4e4c3cd5548623377be4426c974e5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        flnhppppsvjkozmbrnpvxrzz.zcf
        • Path C:\Users\Admin\AppData\Local\flnhppppsvjkozmbrnpvxrzz.zcf
        • Size 280B
        • SHA256 0d3f226ff3fa3b6852456060f674d32dbaf9d985ccb26b0f23840809d274e104
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        flnhppppsvjkozmbrnpvxrzz.zcf
        • Path C:\Users\Admin\AppData\Local\flnhppppsvjkozmbrnpvxrzz.zcf
        • Size 280B
        • SHA256 5daa15f2de865775104ccc8589223588ac187f8073e86742d7454ea3e7d5d60e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ofsxqbmxlzykzvttubofsxqbmxlzykzvttu.ofs
        • Path C:\Users\Admin\AppData\Local\ofsxqbmxlzykzvttubofsxqbmxlzykzvttu.ofs
        • Size 4KB
        • SHA256 48726a091b7245c753dc51de919fdcf25be6a13b930f4351572964618106e5f5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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

        xlvxnvdlwh.bat
        • Path C:\xlvxnvdlwh.bat
        • Size 524KB
        • SHA256 d08ed42905d262599c81f2b1e9a80bb37c14ae4ed9ccb22529020793feb4cc95
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download