Overview

overview

10

Static

static

3

tmpamgfr641.exe

windows10-ltsc_2021-x64

10

tmpamgfr641.exe

windows10-2004-x64

10

tmpamgfr641.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, 02:52

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General

  • Target
    tmpamgfr641.exe
  • Size 1016KB
  • Sample260602-dc6caacs8z
  • SHA256 f5bedc6186655cfd4400e52b036237955e3ffbab91d4c06857bb62cd59635246
  • 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
  • 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 10 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 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 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpamgfr641.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpamgfr641.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1192
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\users\admin\appdata\local\temp\tmpamgfr641.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:1740
      • C:\Users\Admin\AppData\Local\Temp\prxhgs.exe
        "C:\Users\Admin\AppData\Local\Temp\prxhgs.exe" "-C:\Users\Admin\AppData\Local\Temp\bndxgcrbqjsanblm.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:388
      • C:\Users\Admin\AppData\Local\Temp\prxhgs.exe
        "C:\Users\Admin\AppData\Local\Temp\prxhgs.exe" "-C:\Users\Admin\AppData\Local\Temp\bndxgcrbqjsanblm.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:2624
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\users\admin\appdata\local\temp\tmpamgfr641.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:4208
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4420
  • C:\Windows\evqpdeynhftgyrgmqasje.exe
    evqpdeynhftgyrgmqasje.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2600
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\evqpdeynhftgyrgmqasje.exe*."
      2⤵
      • Executes dropped EXE
      PID:1032
  • C:\Windows\bndxgcrbqjsanblm.exe
    bndxgcrbqjsanblm.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4372
  • C:\Windows\rfxtectfwrcmbrdgho.exe
    rfxtectfwrcmbrdgho.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2604
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\rfxtectfwrcmbrdgho.exe*."
      2⤵
      • Executes dropped EXE
      PID:3972
  • C:\Users\Admin\AppData\Local\Temp\ivmhroepfzjsgvgii.exe
    C:\Users\Admin\AppData\Local\Temp\ivmhroepfzjsgvgii.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1728
  • C:\Users\Admin\AppData\Local\Temp\rfxtectfwrcmbrdgho.exe
    C:\Users\Admin\AppData\Local\Temp\rfxtectfwrcmbrdgho.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4596
  • C:\Windows\rfxtectfwrcmbrdgho.exe
    rfxtectfwrcmbrdgho.exe
    1⤵
    • Executes dropped EXE
    PID:4608
  • C:\Windows\pfzxkkdrkhugxpdilulb.exe
    pfzxkkdrkhugxpdilulb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3776
  • C:\Users\Admin\AppData\Local\Temp\bndxgcrbqjsanblm.exe
    C:\Users\Admin\AppData\Local\Temp\bndxgcrbqjsanblm.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3568
  • C:\Windows\crkhtskxplxiypcgiqg.exe
    crkhtskxplxiypcgiqg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1868
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\crkhtskxplxiypcgiqg.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:4388
  • C:\Windows\evqpdeynhftgyrgmqasje.exe
    evqpdeynhftgyrgmqasje.exe
    1⤵
    • Executes dropped EXE
    PID:4780
  • C:\Windows\pfzxkkdrkhugxpdilulb.exe
    pfzxkkdrkhugxpdilulb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4420
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\pfzxkkdrkhugxpdilulb.exe*."
      2⤵
      • Executes dropped EXE
      PID:4604
  • C:\Users\Admin\AppData\Local\Temp\crkhtskxplxiypcgiqg.exe
    C:\Users\Admin\AppData\Local\Temp\crkhtskxplxiypcgiqg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2472
  • C:\Users\Admin\AppData\Local\Temp\pfzxkkdrkhugxpdilulb.exe
    C:\Users\Admin\AppData\Local\Temp\pfzxkkdrkhugxpdilulb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:696
  • C:\Windows\ivmhroepfzjsgvgii.exe
    ivmhroepfzjsgvgii.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4608
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\ivmhroepfzjsgvgii.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:1856
  • C:\Windows\bndxgcrbqjsanblm.exe
    bndxgcrbqjsanblm.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1368
    • C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
      "C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe" "c:\windows\bndxgcrbqjsanblm.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:3528
  • C:\Windows\crkhtskxplxiypcgiqg.exe
    crkhtskxplxiypcgiqg.exe
    1⤵
    • Executes dropped EXE
    PID:2272
  • C:\Users\Admin\AppData\Local\Temp\evqpdeynhftgyrgmqasje.exe
    C:\Users\Admin\AppData\Local\Temp\evqpdeynhftgyrgmqasje.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:456
  • C:\Windows\ivmhroepfzjsgvgii.exe
    ivmhroepfzjsgvgii.exe
    1⤵
    • Executes dropped EXE
    PID:4132

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

        fbbfyedxwzskhfzktifbbf.edx
        • Path C:\Program Files (x86)\fbbfyedxwzskhfzktifbbf.edx
        • Size 280B
        • SHA256 3b4d1bae9498bd6f1a7c3056093cfef4afa355de21cfa2c068d3e6dfa7992b5a
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fbbfyedxwzskhfzktifbbf.edx
        • Path C:\Program Files (x86)\fbbfyedxwzskhfzktifbbf.edx
        • Size 280B
        • SHA256 0aed1c0ca60217ddf96afae65ecef56b15f8c6947d5eb83e2390995e3676cc33
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fbbfyedxwzskhfzktifbbf.edx
        • Path C:\Program Files (x86)\fbbfyedxwzskhfzktifbbf.edx
        • Size 280B
        • SHA256 c4e5629d9967e8274603451352a829df71149d06831a668d56b052d26edbf004
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        jmudieyytwe.exe
        • Path C:\Users\Admin\AppData\Local\Temp\jmudieyytwe.exe
        • Size 320KB
        • SHA256 9a79642f0ea81df7054dfed5f7aefb322a895add6416b5bd9224a64faf289bc1
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        prxhgs.exe
        • Path C:\Users\Admin\AppData\Local\Temp\prxhgs.exe
        • Size 712KB
        • SHA256 8683008b3b081e197b9c647ed9e595bd9c8929271b2d2ca2db24c55042981af1
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fbbfyedxwzskhfzktifbbf.edx
        • Path C:\Users\Admin\AppData\Local\fbbfyedxwzskhfzktifbbf.edx
        • Size 280B
        • SHA256 71777cff9a4daf15c089fbdc32834706b10b21bc4341b82f098a21209f07ead6
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        wdodhyinxlpsajokeemtetxoydnbfiqze.uuc
        • Path C:\Users\Admin\AppData\Local\wdodhyinxlpsajokeemtetxoydnbfiqze.uuc
        • Size 4KB
        • SHA256 1961f554c4501b1bf554212a96c73472a55ba439660454dde3236b375df0b3f3
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        rfxtectfwrcmbrdgho.exe
        • Path C:\Windows\SysWOW64\rfxtectfwrcmbrdgho.exe
        • Size 1016KB
        • SHA256 f5bedc6186655cfd4400e52b036237955e3ffbab91d4c06857bb62cd59635246
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download