Overview

overview

10

Static

static

3

jaffacakes...uh.exe

windows10-2004-x64

10

jaffacakes...uh.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    18/10/2026, 22:29

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General

  • Target
    jaffacakes118_Trojan.Win32.Chydo.cuh.exe
  • Size 532KB
  • Sample261018-2d8e2abt8v
  • SHA256 263d71dcb8c1e2a5172cf9224961d55777312e7a4fcdeb97b4a2d18f05955873
  • 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 5 IoCs
    persistence
  • UAC bypass 3 TTPs 14 IoCs
    defense_evasiontrojan
  • Adds policy Run key to start application 2 TTPs 33 IoCs
    persistence
  • Disables RegEdit via registry modification 8 IoCs
    defense_evasion
  • 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 10 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 1 TTPs 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

    discovery
  • Drops autorun.inf file 1 TTPs 4 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • Drops file in System32 directory 39 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 39 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

    discovery
  • 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 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs
  • System policy modification 1 TTPs 40 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan.Win32.Chydo.cuh.exe
    "C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan.Win32.Chydo.cuh.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5788
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_trojan.win32.chydo.cuh.exe*"
      2⤵
      • 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 Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:2832
      • C:\Users\Admin\AppData\Local\Temp\beiqr.exe
        "C:\Users\Admin\AppData\Local\Temp\beiqr.exe" "-c:\users\admin\appdata\local\temp\jaffacakes118_trojan.win32.chydo.cuh.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
        • Reads the TCP/IP host and domain name from the registry
        • System Location Discovery: System Language Discovery
        • Modifies registry class
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • System policy modification
        PID:2328
      • C:\Users\Admin\AppData\Local\Temp\beiqr.exe
        "C:\Users\Admin\AppData\Local\Temp\beiqr.exe" "-c:\users\admin\appdata\local\temp\jaffacakes118_trojan.win32.chydo.cuh.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:4928
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_trojan.win32.chydo.cuh.exe"
      2⤵
      • 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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:4416
  • C:\Windows\mexukcytthpvcencupia.exe
    mexukcytthpvcencupia.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1220
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\windows\mexukcytthpvcencupia.exe*."
      2⤵
      • Executes dropped EXE
      PID:5640
  • C:\Windows\buomdwtpqfovdgqgzvpic.exe
    buomdwtpqfovdgqgzvpic.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2460
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4712
  • C:\Users\Admin\AppData\Local\Temp\zqietkfzylsxdemarld.exe
    C:\Users\Admin\AppData\Local\Temp\zqietkfzylsxdemarld.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:860
  • C:\Windows\oevqeuohfrxbggnaqj.exe
    oevqeuohfrxbggnaqj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4236
  • C:\Windows\oevqeuohfrxbggnaqj.exe
    oevqeuohfrxbggnaqj.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:6056
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\windows\oevqeuohfrxbggnaqj.exe*."
      2⤵
      • Executes dropped EXE
      PID:2396
  • C:\Windows\fukergzrozehlkqcr.exe
    fukergzrozehlkqcr.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2516
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\windows\fukergzrozehlkqcr.exe*."
      2⤵
      • 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
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System policy modification
      PID:3060
  • C:\Windows\ymbugumdzjnpsqvg.exe
    ymbugumdzjnpsqvg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5840
  • C:\Windows\ymbugumdzjnpsqvg.exe
    ymbugumdzjnpsqvg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5436
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\windows\ymbugumdzjnpsqvg.exe*."
      2⤵
      • Executes dropped EXE
      PID:2684
  • C:\Windows\zqietkfzylsxdemarld.exe
    zqietkfzylsxdemarld.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2960
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\windows\zqietkfzylsxdemarld.exe*."
      2⤵
      • Executes dropped EXE
      PID:1100
  • C:\Windows\zqietkfzylsxdemarld.exe
    zqietkfzylsxdemarld.exe
    1⤵
    • Executes dropped EXE
    PID:3556
  • C:\Windows\mexukcytthpvcencupia.exe
    mexukcytthpvcencupia.exe
    1⤵
    • Executes dropped EXE
    PID:6040
  • C:\Users\Admin\AppData\Local\Temp\fukergzrozehlkqcr.exe
    C:\Users\Admin\AppData\Local\Temp\fukergzrozehlkqcr.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5096
  • C:\Users\Admin\AppData\Local\Temp\mexukcytthpvcencupia.exe
    C:\Users\Admin\AppData\Local\Temp\mexukcytthpvcencupia.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1956
  • C:\Windows\buomdwtpqfovdgqgzvpic.exe
    buomdwtpqfovdgqgzvpic.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2396
    • C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe
      "C:\Users\Admin\AppData\Local\Temp\ebzssyhtolj.exe" "c:\windows\buomdwtpqfovdgqgzvpic.exe*."
      2⤵
      • Executes dropped EXE
      PID:4468
  • C:\Users\Admin\AppData\Local\Temp\buomdwtpqfovdgqgzvpic.exe
    C:\Users\Admin\AppData\Local\Temp\buomdwtpqfovdgqgzvpic.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1216
  • C:\Users\Admin\AppData\Local\Temp\ymbugumdzjnpsqvg.exe
    C:\Users\Admin\AppData\Local\Temp\ymbugumdzjnpsqvg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3212
  • C:\Users\Admin\AppData\Local\Temp\oevqeuohfrxbggnaqj.exe
    C:\Users\Admin\AppData\Local\Temp\oevqeuohfrxbggnaqj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4660
  • C:\Windows\fukergzrozehlkqcr.exe
    fukergzrozehlkqcr.exe
    1⤵
    • Executes dropped EXE
    PID:5424

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

        System Information Discovery

        2
        T1082

        System Location Discovery

        1
        T1614

        System Language Discovery

        1
        T1614.001

        System Network Configuration Discovery

        2
        T1016

        Internet Connection Discovery

        1
        T1016.001

        Lateral Movement

        Replication Through Removable Media

        1
        T1091

        Collection

        Command and Control

        Exfiltration

        Impact

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 4700b6e70c7bbf2e55f9fb2eeec626f968db138e9fc90cf8b712a7599b89cb52
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 67d0aaeed19ece220e8074cacdfeeb4857a466e4582dce91eea6f72424e4c225
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 5e9b3a7dd18226742e8d2db7fbe980acdb59d49603699a9612e71358c46c707d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 3f6cbbbb1a40bb375874b9310b119eda3f9443ccb3bbe448e547e8b75c196b7d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 962de9632988fd256fe392f4cb8a188007bc26a3f439362e7ccdd15e48c9be83
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 56c0fe3e8ad85b3b6de4dc7db1d5376a0fcba3791557fcb480c58a35b24e8b3d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Path C:\Program Files (x86)\beiqrubhsrkbtgaadjnqucdgnte.wnf
        • Size 272B
        • SHA256 b30226aa767afbce6709c896a18bc4e02104934d5fc9d833d2a736e81f42a257
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ymbugumdzjnpsqvgulaodwiwofblprusxiwncq.yky
        • Path C:\Program Files (x86)\ymbugumdzjnpsqvgulaodwiwofblprusxiwncq.yky
        • Size 3KB
        • SHA256 c2dc435c417eb3152440ef92ae98b4a0c0db8f180b70c9b33e0494e9b826881c
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        beiqr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\beiqr.exe
        • Size 720KB
        • SHA256 9f0869c1cd6beff0da3110d8e377bdf9a1d0a62a887b8ebcba25868cd153712b
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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

        ygpciqcndh.exe
        • Path C:\Users\Admin\AppData\Local\Temp\qalaisgtlrrp\ygpciqcndh.exe
        • Size 480KB
        • SHA256 75ce0015bca2fe781d008d2abee4d255b64232acdf6d40b3ae38e4a0df7aa401
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fukergzrozehlkqcr.exe
        • Path C:\Windows\SysWOW64\fukergzrozehlkqcr.exe
        • Size 532KB
        • SHA256 263d71dcb8c1e2a5172cf9224961d55777312e7a4fcdeb97b4a2d18f05955873
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download