Overview

overview

10

Static

static

3

tmpas_v4x38.exe

windows10-ltsc_2021-x64

10

tmpas_v4x38.exe

windows10-2004-x64

10

tmpas_v4x38.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    149s
  • 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, 15:03

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General

  • Target
    tmpas_v4x38.exe
  • Size 564KB
  • Sample260522-sfagcahs71
  • SHA256 9af01475a31bd82f4dc99d8c82aeff77dee3b14093a710be608e32cad8eff8a5
  • 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
  • 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 4 IoCs

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

  • 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\tmpas_v4x38.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpas_v4x38.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1508
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\users\admin\appdata\local\temp\tmpas_v4x38.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:1720
      • C:\Users\Admin\AppData\Local\Temp\bgkvekj.exe
        "C:\Users\Admin\AppData\Local\Temp\bgkvekj.exe" "-C:\Users\Admin\AppData\Local\Temp\aobvnckgwjznlykb.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:1200
      • C:\Users\Admin\AppData\Local\Temp\bgkvekj.exe
        "C:\Users\Admin\AppData\Local\Temp\bgkvekj.exe" "-C:\Users\Admin\AppData\Local\Temp\aobvnckgwjznlykb.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:2124
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\users\admin\appdata\local\temp\tmpas_v4x38.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:948
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4280
  • C:\Windows\hwkfyoxulzqfesfxi.exe
    hwkfyoxulzqfesfxi.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5000
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\hwkfyoxulzqfesfxi.exe*."
      2⤵
      • Executes dropped EXE
      PID:1972
  • C:\Windows\bsifasdcvlevwmbvibf.exe
    bsifasdcvlevwmbvibf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2568
  • C:\Windows\qgvrlcmkcrjzzocvhz.exe
    qgvrlcmkcrjzzocvhz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3852
  • C:\Windows\bsifasdcvlevwmbvibf.exe
    bsifasdcvlevwmbvibf.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2264
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\bsifasdcvlevwmbvibf.exe*."
      2⤵
      • Executes dropped EXE
      PID:4528
  • C:\Users\Admin\AppData\Local\Temp\bsifasdcvlevwmbvibf.exe
    C:\Users\Admin\AppData\Local\Temp\bsifasdcvlevwmbvibf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2380
  • C:\Users\Admin\AppData\Local\Temp\hwkfyoxulzqfesfxi.exe
    C:\Users\Admin\AppData\Local\Temp\hwkfyoxulzqfesfxi.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3556
  • C:\Windows\hwkfyoxulzqfesfxi.exe
    hwkfyoxulzqfesfxi.exe
    1⤵
    • Executes dropped EXE
    PID:1264
  • C:\Users\Admin\AppData\Local\Temp\dwonkersnfatwofbqlrkc.exe
    C:\Users\Admin\AppData\Local\Temp\dwonkersnfatwofbqlrkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4680
  • C:\Windows\dwonkersnfatwofbqlrkc.exe
    dwonkersnfatwofbqlrkc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3088
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\dwonkersnfatwofbqlrkc.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:2168
  • C:\Windows\aobvnckgwjznlykb.exe
    aobvnckgwjznlykb.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:8
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\aobvnckgwjznlykb.exe*."
      2⤵
      • Executes dropped EXE
      PID:4508
  • C:\Users\Admin\AppData\Local\Temp\ogxvrkwwqhbtvmcxlfkc.exe
    C:\Users\Admin\AppData\Local\Temp\ogxvrkwwqhbtvmcxlfkc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4704
  • C:\Users\Admin\AppData\Local\Temp\aobvnckgwjznlykb.exe
    C:\Users\Admin\AppData\Local\Temp\aobvnckgwjznlykb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:412
  • C:\Windows\aobvnckgwjznlykb.exe
    aobvnckgwjznlykb.exe
    1⤵
    • Executes dropped EXE
    PID:3864
  • C:\Windows\dwonkersnfatwofbqlrkc.exe
    dwonkersnfatwofbqlrkc.exe
    1⤵
    • Executes dropped EXE
    PID:5060
  • C:\Users\Admin\AppData\Local\Temp\qgvrlcmkcrjzzocvhz.exe
    C:\Users\Admin\AppData\Local\Temp\qgvrlcmkcrjzzocvhz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3472
  • C:\Windows\ogxvrkwwqhbtvmcxlfkc.exe
    ogxvrkwwqhbtvmcxlfkc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:244
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\ogxvrkwwqhbtvmcxlfkc.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:1516
  • C:\Windows\qgvrlcmkcrjzzocvhz.exe
    qgvrlcmkcrjzzocvhz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:324
    • C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
      "C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe" "c:\windows\qgvrlcmkcrjzzocvhz.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:2652
  • C:\Windows\ogxvrkwwqhbtvmcxlfkc.exe
    ogxvrkwwqhbtvmcxlfkc.exe
    1⤵
    • Executes dropped EXE
    PID:3232

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

        Loading Replay Monitor...

        Downloads

        bgkvekj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\bgkvekj.exe
        • Size 700KB
        • SHA256 47c9ac2684964842ca3e9bfedb9311e776b0a1ba902abc9449b981944903d505
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        qzsahtyjajc.exe
        • Path C:\Users\Admin\AppData\Local\Temp\qzsahtyjajc.exe
        • Size 320KB
        • SHA256 cf47f6ef4e2bba182e933ce9dc957b719fc61bba10ee5987f2837ba9b2a649b6
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        aipdpyaqahrzryeptdygnbnwyoyfpxpw.nrb
        • Path C:\Users\Admin\AppData\Local\aipdpyaqahrzryeptdygnbnwyoyfpxpw.nrb
        • Size 4KB
        • SHA256 a45c6e79b4955ece1aad2518042a31c7f50e86b366082728688f522cd23e4e80
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fcybcarwvrqnuqllednkg.kiz
        • Path C:\Users\Admin\AppData\Local\fcybcarwvrqnuqllednkg.kiz
        • Size 280B
        • SHA256 5f8fd47354f13c5b135535b5c30a4cd65aaeb8ceab7501f6f663a8d1e3a5696d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        qgvrlcmkcrjzzocvhz.exe
        • Path C:\Windows\SysWOW64\qgvrlcmkcrjzzocvhz.exe
        • Size 564KB
        • SHA256 9af01475a31bd82f4dc99d8c82aeff77dee3b14093a710be608e32cad8eff8a5
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download