Overview

overview

10

Static

static

3

tmpia6aetn4.exe

windows10-ltsc_2021-x64

10

tmpia6aetn4.exe

windows10-2004-x64

10

tmpia6aetn4.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    22/05/2026, 14:37

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General

  • Target
    tmpia6aetn4.exe
  • Size 656KB
  • Sample260522-ry6f3ad18q
  • SHA256 981060a1e46587bf0a8a8a74b64ab520240c502326cfa347a72b10f73c59a1c8
  • 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
  • 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 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 4 IoCs

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

  • 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 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 42 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpia6aetn4.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpia6aetn4.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2128
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\users\admin\appdata\local\temp\tmpia6aetn4.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:5032
      • C:\Users\Admin\AppData\Local\Temp\bajtr.exe
        "C:\Users\Admin\AppData\Local\Temp\bajtr.exe" "-C:\Users\Admin\AppData\Local\Temp\yicxgyncrjznlykb.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 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:1580
      • C:\Users\Admin\AppData\Local\Temp\bajtr.exe
        "C:\Users\Admin\AppData\Local\Temp\bajtr.exe" "-C:\Users\Admin\AppData\Local\Temp\yicxgyncrjznlykb.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:1808
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\users\admin\appdata\local\temp\tmpia6aetn4.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:4992
  • C:\Windows\oawteypgxrjzzocvhz.exe
    oawteypgxrjzzocvhz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4556
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:3228
  • C:\Windows\zmjhtogyqlevwmbvibd.exe
    zmjhtogyqlevwmbvibd.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1900
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\zmjhtogyqlevwmbvibd.exe*."
      2⤵
      • Executes dropped EXE
      PID:4616
  • C:\Windows\yicxgyncrjznlykb.exe
    yicxgyncrjznlykb.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:772
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\yicxgyncrjznlykb.exe*."
      2⤵
      • Executes dropped EXE
      PID:4592
  • C:\Users\Admin\AppData\Local\Temp\zmjhtogyqlevwmbvibd.exe
    C:\Users\Admin\AppData\Local\Temp\zmjhtogyqlevwmbvibd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4624
  • C:\Windows\bqppdauoifatwofbqlped.exe
    bqppdauoifatwofbqlped.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3736
  • C:\Windows\mayxkgzslhbtvmcxlfiw.exe
    mayxkgzslhbtvmcxlfiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1036
  • C:\Windows\fqlhrkaqgzqfesfxi.exe
    fqlhrkaqgzqfesfxi.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3712
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\fqlhrkaqgzqfesfxi.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:3452
  • C:\Users\Admin\AppData\Local\Temp\bqppdauoifatwofbqlped.exe
    C:\Users\Admin\AppData\Local\Temp\bqppdauoifatwofbqlped.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1988
  • C:\Windows\bqppdauoifatwofbqlped.exe
    bqppdauoifatwofbqlped.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:784
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\bqppdauoifatwofbqlped.exe*."
      2⤵
      • Executes dropped EXE
      PID:4596
  • C:\Windows\zmjhtogyqlevwmbvibd.exe
    zmjhtogyqlevwmbvibd.exe
    1⤵
    • Executes dropped EXE
    PID:1684
  • C:\Windows\mayxkgzslhbtvmcxlfiw.exe
    mayxkgzslhbtvmcxlfiw.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2500
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\mayxkgzslhbtvmcxlfiw.exe*."
      2⤵
      • Executes dropped EXE
      PID:3500
  • C:\Users\Admin\AppData\Local\Temp\fqlhrkaqgzqfesfxi.exe
    C:\Users\Admin\AppData\Local\Temp\fqlhrkaqgzqfesfxi.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:112
  • C:\Users\Admin\AppData\Local\Temp\yicxgyncrjznlykb.exe
    C:\Users\Admin\AppData\Local\Temp\yicxgyncrjznlykb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4712
  • C:\Windows\oawteypgxrjzzocvhz.exe
    oawteypgxrjzzocvhz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4112
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\oawteypgxrjzzocvhz.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:1136
  • C:\Users\Admin\AppData\Local\Temp\oawteypgxrjzzocvhz.exe
    C:\Users\Admin\AppData\Local\Temp\oawteypgxrjzzocvhz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5048
  • C:\Users\Admin\AppData\Local\Temp\mayxkgzslhbtvmcxlfiw.exe
    C:\Users\Admin\AppData\Local\Temp\mayxkgzslhbtvmcxlfiw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:704
  • C:\Windows\yicxgyncrjznlykb.exe
    yicxgyncrjznlykb.exe
    1⤵
    • Executes dropped EXE
    PID:4644
  • C:\Windows\fqlhrkaqgzqfesfxi.exe
    fqlhrkaqgzqfesfxi.exe
    1⤵
    • Executes dropped EXE
    PID:3928

Network

        MITRE ATT&CK Enterprise v16

        Reconnaissance

        Resource Development

        Initial Access

        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

        Lateral Movement

        Collection

        Command and Control

        Exfiltration

        Impact

        Replay Monitor

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        Downloads

        bajtr.exe
        • Path C:\Users\Admin\AppData\Local\Temp\bajtr.exe
        • Size 700KB
        • SHA256 2c2796fc1047920c6ddc81ad1d94afc9e832678dd2b2fbde57a21da741f431d9
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        qzsahtyjajc.exe
        • Path C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
        • Size 320KB
        • SHA256 c8c542ac3f6526d1501c2b9d6262bfa029a1ac0d9dd6b3c1965977abdd8bd126
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        dwzdvwusqrqnuqlledleh.dec
        • Path C:\Users\Admin\AppData\Local\dwzdvwusqrqnuqlledleh.dec
        • Size 272B
        • SHA256 a91f146d9a01bd905d7bfcda972aa8009f4169663e66e3a05b18c83a5dfe0695
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ycqfiudmvhrzryeptdwaodgsbktfpxpw.nrb
        • Path C:\Users\Admin\AppData\Local\ycqfiudmvhrzryeptdwaodgsbktfpxpw.nrb
        • Size 3KB
        • SHA256 fc92343857c3cfbdf6e44cdfbdf098ab56f40eb7c3a05a8e57eb4c6a023853ed
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        oawteypgxrjzzocvhz.exe
        • Path C:\Windows\SysWOW64\oawteypgxrjzzocvhz.exe
        • Size 656KB
        • SHA256 981060a1e46587bf0a8a8a74b64ab520240c502326cfa347a72b10f73c59a1c8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download