Overview

overview

10

Static

static

3

tmp6erbuvty.exe

windows10-ltsc_2021-x64

10

tmp6erbuvty.exe

windows10-2004-x64

10

tmp6erbuvty.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
    02/06/2026, 03:08

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General

  • Target
    tmp6erbuvty.exe
  • Size 600KB
  • Sample260602-dnb8kscv71
  • SHA256 30f5e58d8f17018e21ebdc8e4322de654a6b5caab57d4bf8515dbda524a9ea0f
  • 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 37 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 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 11 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\tmp6erbuvty.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp6erbuvty.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3356
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\users\admin\appdata\local\temp\tmp6erbuvty.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:2644
      • C:\Users\Admin\AppData\Local\Temp\cghobfj.exe
        "C:\Users\Admin\AppData\Local\Temp\cghobfj.exe" "-C:\Users\Admin\AppData\Local\Temp\boyokxkewivvlibq.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:1036
      • C:\Users\Admin\AppData\Local\Temp\cghobfj.exe
        "C:\Users\Admin\AppData\Local\Temp\cghobfj.exe" "-C:\Users\Admin\AppData\Local\Temp\boyokxkewivvlibq.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:3924
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\users\admin\appdata\local\temp\tmp6erbuvty.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:2432
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:5016
  • C:\Windows\rgskixmicqfhzytkiq.exe
    rgskixmicqfhzytkiq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3944
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\rgskixmicqfhzytkiq.exe*."
      2⤵
      • Executes dropped EXE
      PID:3684
  • C:\Windows\pguoofwuqgxbvwtmmwlc.exe
    pguoofwuqgxbvwtmmwlc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2384
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\pguoofwuqgxbvwtmmwlc.exe*."
      2⤵
      • Executes dropped EXE
      PID:2884
  • C:\Windows\pguoofwuqgxbvwtmmwlc.exe
    pguoofwuqgxbvwtmmwlc.exe
    1⤵
    • Executes dropped EXE
    PID:1648
  • C:\Users\Admin\AppData\Local\Temp\boyokxkewivvlibq.exe
    C:\Users\Admin\AppData\Local\Temp\boyokxkewivvlibq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4572
  • C:\Windows\csfyxndavkadwwskjsg.exe
    csfyxndavkadwwskjsg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3204
  • C:\Windows\rgskixmicqfhzytkiq.exe
    rgskixmicqfhzytkiq.exe
    1⤵
    • Executes dropped EXE
    PID:416
  • C:\Windows\iwhyvjxslymnecwmj.exe
    iwhyvjxslymnecwmj.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4412
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\iwhyvjxslymnecwmj.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:1724
  • C:\Users\Admin\AppData\Local\Temp\pguoofwuqgxbvwtmmwlc.exe
    C:\Users\Admin\AppData\Local\Temp\pguoofwuqgxbvwtmmwlc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1720
  • C:\Users\Admin\AppData\Local\Temp\iwhyvjxslymnecwmj.exe
    C:\Users\Admin\AppData\Local\Temp\iwhyvjxslymnecwmj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2792
  • C:\Users\Admin\AppData\Local\Temp\rgskixmicqfhzytkiq.exe
    C:\Users\Admin\AppData\Local\Temp\rgskixmicqfhzytkiq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1684
  • C:\Users\Admin\AppData\Local\Temp\csfyxndavkadwwskjsg.exe
    C:\Users\Admin\AppData\Local\Temp\csfyxndavkadwwskjsg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3500
  • C:\Windows\boyokxkewivvlibq.exe
    boyokxkewivvlibq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2836
  • C:\Windows\iwhyvjxslymnecwmj.exe
    iwhyvjxslymnecwmj.exe
    1⤵
    • Executes dropped EXE
    PID:3796
  • C:\Windows\boyokxkewivvlibq.exe
    boyokxkewivvlibq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2476
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\boyokxkewivvlibq.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:3432
  • C:\Users\Admin\AppData\Local\Temp\ewlghzrqnewbwywqrcskz.exe
    C:\Users\Admin\AppData\Local\Temp\ewlghzrqnewbwywqrcskz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3120
  • C:\Windows\ewlghzrqnewbwywqrcskz.exe
    ewlghzrqnewbwywqrcskz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1360
  • C:\Windows\csfyxndavkadwwskjsg.exe
    csfyxndavkadwwskjsg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3932
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\csfyxndavkadwwskjsg.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:1368
  • C:\Windows\ewlghzrqnewbwywqrcskz.exe
    ewlghzrqnewbwywqrcskz.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:912
    • C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
      "C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe" "c:\windows\ewlghzrqnewbwywqrcskz.exe*."
      2⤵
      • Executes dropped EXE
      PID:4316

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

        gcvuzvruvqmvuacafuokd.hdz
        • Path C:\Program Files (x86)\gcvuzvruvqmvuacafuokd.hdz
        • Size 272B
        • SHA256 b232535001380afdac1d8a9b90d989d12f2786f39ba45e42dfd3ae4a6cb740ec
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gcvuzvruvqmvuacafuokd.hdz
        • Path C:\Program Files (x86)\gcvuzvruvqmvuacafuokd.hdz
        • Size 272B
        • SHA256 63de55ce37c8760c2a52e7c6d33ab6013be07cad6777b29fde606ad60f718740
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gcvuzvruvqmvuacafuokd.hdz
        • Path C:\Program Files (x86)\gcvuzvruvqmvuacafuokd.hdz
        • Size 272B
        • SHA256 21129788215f3e2e47b3ee353a4c8524622b1d21b1adf437300d832dedbcff27
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gcvuzvruvqmvuacafuokd.hdz
        • Path C:\Program Files (x86)\gcvuzvruvqmvuacafuokd.hdz
        • Size 272B
        • SHA256 61c62de66b98d2a5521cf8847eb460e80ae765378ad517c2baea11bf1318003b
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cghobfj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cghobfj.exe
        • Size 724KB
        • SHA256 936b80ea589c52761766b2ffc8a8272f4227a6f714d48939eb88198868d699b3
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        mhskyizawrc.exe
        • Path C:\Users\Admin\AppData\Local\Temp\mhskyizawrc.exe
        • Size 320KB
        • SHA256 0cc02d34d5fd4cf892fed282f98c1ad3e7dd6159a8877ae5c46d3f834ed36060
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        bimwmtaoagnhriveuuzgkukrymyelfpg.css
        • Path C:\Users\Admin\AppData\Local\bimwmtaoagnhriveuuzgkukrymyelfpg.css
        • Size 3KB
        • SHA256 6cd5f02036faa5315aca8c7f21bf44f05cd12ecf74cda08ac2e7451786db1e94
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gcvuzvruvqmvuacafuokd.hdz
        • Path C:\Users\Admin\AppData\Local\gcvuzvruvqmvuacafuokd.hdz
        • Size 272B
        • SHA256 e5e4fc6f51da76ea26828e87e23b6375a5837e6b00cf11d65ea3066788b8855a
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rgskixmicqfhzytkiq.exe
        • Path C:\Windows\SysWOW64\rgskixmicqfhzytkiq.exe
        • Size 600KB
        • SHA256 30f5e58d8f17018e21ebdc8e4322de654a6b5caab57d4bf8515dbda524a9ea0f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download