Overview

overview

10

Static

static

3

jaffacakes...ei.exe

windows10-2004-x64

10

jaffacakes...ei.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    154s
  • 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, 22:28

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General

  • Target
    jaffacakes118_Trojan.Win32.Chydo.cei.exe
  • Size 556KB
  • Sample261018-2d6ansbt8s
  • SHA256 94962625cb5a3a2911ffeefa18525ee63b5513c6914b8432dca264fe36d3b4b6
  • 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 34 IoCs
    persistence
  • Disables RegEdit via registry modification 6 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 5 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 16 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.cei.exe
    "C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan.Win32.Chydo.cei.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4280
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_trojan.win32.chydo.cei.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:1528
      • C:\Users\Admin\AppData\Local\Temp\cfnmp.exe
        "C:\Users\Admin\AppData\Local\Temp\cfnmp.exe" "-C:\Users\Admin\AppData\Local\Temp\zngqezpeynrhynho.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:3304
      • C:\Users\Admin\AppData\Local\Temp\cfnmp.exe
        "C:\Users\Admin\AppData\Local\Temp\cfnmp.exe" "-C:\Users\Admin\AppData\Local\Temp\zngqezpeynrhynho.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:4344
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_trojan.win32.chydo.cei.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:3028
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4276
  • C:\Windows\pfamczrievbtmdzidj.exe
    pfamczrievbtmdzidj.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4320
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\windows\pfamczrievbtmdzidj.exe*."
      2⤵
      • Executes dropped EXE
      PID:4092
  • C:\Windows\cvtibbwqpjsnjdcomvomb.exe
    cvtibbwqpjsnjdcomvomb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2336
  • C:\Users\Admin\AppData\Local\Temp\zngqezpeynrhynho.exe
    C:\Users\Admin\AppData\Local\Temp\zngqezpeynrhynho.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1212
  • C:\Users\Admin\AppData\Local\Temp\nfcqihbusltnibzkhphe.exe
    C:\Users\Admin\AppData\Local\Temp\nfcqihbusltnibzkhphe.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:852
  • C:\Windows\nfcqihbusltnibzkhphe.exe
    nfcqihbusltnibzkhphe.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5880
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\windows\nfcqihbusltnibzkhphe.exe*."
      2⤵
      • Executes dropped EXE
      PID:5724
  • C:\Windows\nfcqihbusltnibzkhphe.exe
    nfcqihbusltnibzkhphe.exe
    1⤵
    • Executes dropped EXE
    PID:1184
  • C:\Windows\gvpaplcsndizrhcke.exe
    gvpaplcsndizrhcke.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3436
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\windows\gvpaplcsndizrhcke.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:2448
  • C:\Users\Admin\AppData\Local\Temp\arnarpiaxpwpjbyielc.exe
    C:\Users\Admin\AppData\Local\Temp\arnarpiaxpwpjbyielc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4452
  • C:\Windows\arnarpiaxpwpjbyielc.exe
    arnarpiaxpwpjbyielc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4680
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\windows\arnarpiaxpwpjbyielc.exe*."
      2⤵
      • Executes dropped EXE
      PID:4900
  • C:\Windows\arnarpiaxpwpjbyielc.exe
    arnarpiaxpwpjbyielc.exe
    1⤵
    • Executes dropped EXE
    PID:3408
  • C:\Windows\pfamczrievbtmdzidj.exe
    pfamczrievbtmdzidj.exe
    1⤵
    • Executes dropped EXE
    PID:1744
  • C:\Windows\cvtibbwqpjsnjdcomvomb.exe
    cvtibbwqpjsnjdcomvomb.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5232
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\windows\cvtibbwqpjsnjdcomvomb.exe*."
      2⤵
      • Executes dropped EXE
      PID:964
  • C:\Users\Admin\AppData\Local\Temp\cvtibbwqpjsnjdcomvomb.exe
    C:\Users\Admin\AppData\Local\Temp\cvtibbwqpjsnjdcomvomb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4132
  • C:\Users\Admin\AppData\Local\Temp\pfamczrievbtmdzidj.exe
    C:\Users\Admin\AppData\Local\Temp\pfamczrievbtmdzidj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5044
  • C:\Users\Admin\AppData\Local\Temp\gvpaplcsndizrhcke.exe
    C:\Users\Admin\AppData\Local\Temp\gvpaplcsndizrhcke.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3824
  • C:\Windows\zngqezpeynrhynho.exe
    zngqezpeynrhynho.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5724
    • C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe
      "C:\Users\Admin\AppData\Local\Temp\uteqaprfedo.exe" "c:\windows\zngqezpeynrhynho.exe*."
      2⤵
      • Executes dropped EXE
      PID:3580
  • C:\Windows\zngqezpeynrhynho.exe
    zngqezpeynrhynho.exe
    1⤵
    • Executes dropped EXE
    PID:2432
  • C:\Windows\gvpaplcsndizrhcke.exe
    gvpaplcsndizrhcke.exe
    1⤵
    • Executes dropped EXE
    PID:2952

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

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 50bd4d127a3213d0598b15c12de3433cea51e790f937310bd943bcc154f25f60
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 d584c963454cfbd94b1793b33ebfbb05ce6df1ec98cc36bb19d8504403be0645
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 690a41a15c238ef11664fa5089e68c91fa216c95f638dd12c5b0afbac019d5d4
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 5036e772e8ded941c95f3e6abfd9a8f22d1f70c57a804c96ad00a3ed77415d20
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 576fd7aa75b15daef3a3b2b983d29810828c0f2054d2effaa8053f2408ba6500
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 1a2f064e806f95480df875046069eeb6bc482ef792aac1b0aa5c73eb911d21a7
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        mntqrzcelnehlnuoulmspqybd.mdg
        • Path C:\Program Files (x86)\mntqrzcelnehlnuoulmspqybd.mdg
        • Size 272B
        • SHA256 73b4080a9306ee72a890904666b49a50e3baada483bdedaed53d39fcca4019fb
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rducohvianpdsfxctvhygslzmerthwjbgxzl.kwp
        • Path C:\Program Files (x86)\rducohvianpdsfxctvhygslzmerthwjbgxzl.kwp
        • Size 3KB
        • SHA256 1ddcdb7853652cf56917bdc9e994b87aa05c5d9f73fe59350302f93b2b103c5d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        cfnmp.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cfnmp.exe
        • Size 704KB
        • SHA256 20160754b170556552a133fe21aaf5710e332b3cbffee76b28cb3a1fdd8cb5cd
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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

        zhuygvfocl.exe
        • Path C:\Users\Admin\AppData\Local\Temp\zhuygvfocl\zhuygvfocl.exe
        • Size 652KB
        • SHA256 9af33407fd3e9d1a41da9959f0423d26a19ceff49bf329a48195ee4e28e70e24
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        gvpaplcsndizrhcke.exe
        • Path C:\Windows\SysWOW64\gvpaplcsndizrhcke.exe
        • Size 556KB
        • SHA256 94962625cb5a3a2911ffeefa18525ee63b5513c6914b8432dca264fe36d3b4b6
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download