Overview

overview

10

Static

static

3

tmpv4c9m3lz.exe

windows10-ltsc_2021-x64

10

tmpv4c9m3lz.exe

windows10-2004-x64

10

tmpv4c9m3lz.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    22/05/2026, 15:12

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General

  • Target
    tmpv4c9m3lz.exe
  • Size 1016KB
  • Sample260522-sllrkahw21
  • SHA256 19bfc62f4162a8399e6c22f14721710d96007e027aaa8154e3d80bb725c360e4
  • 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
  • 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 7 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 6 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 19 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\tmpv4c9m3lz.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpv4c9m3lz.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2468
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\users\admin\appdata\local\temp\tmpv4c9m3lz.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:4708
      • C:\Users\Admin\AppData\Local\Temp\xbmweck.exe
        "C:\Users\Admin\AppData\Local\Temp\xbmweck.exe" "-C:\Users\Admin\AppData\Local\Temp\wjdwnulewnhqmaas.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:4184
      • C:\Users\Admin\AppData\Local\Temp\xbmweck.exe
        "C:\Users\Admin\AppData\Local\Temp\xbmweck.exe" "-C:\Users\Admin\AppData\Local\Temp\wjdwnulewnhqmaas.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:3384
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\users\admin\appdata\local\temp\tmpv4c9m3lz.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:3220
  • C:\Windows\wjdwnulewnhqmaas.exe
    wjdwnulewnhqmaas.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2096
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\windows\wjdwnulewnhqmaas.exe*."
      2⤵
      • Executes dropped EXE
      PID:6100
  • C:\Windows\mbxslunicvrcaqsmjg.exe
    mbxslunicvrcaqsmjg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2256
  • C:\Windows\kbzwrcxuqljwwosonmdb.exe
    kbzwrcxuqljwwosonmdb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5520
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:4496
  • C:\Users\Admin\AppData\Local\Temp\zrqokwsqnjiwxqvssskjh.exe
    C:\Users\Admin\AppData\Local\Temp\zrqokwsqnjiwxqvssskjh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5960
  • C:\Users\Admin\AppData\Local\Temp\mbxslunicvrcaqsmjg.exe
    C:\Users\Admin\AppData\Local\Temp\mbxslunicvrcaqsmjg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5604
  • C:\Windows\drmgygysldyifuvok.exe
    drmgygysldyifuvok.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3260
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\windows\drmgygysldyifuvok.exe*."
      2⤵
      • Executes dropped EXE
      PID:2684
  • C:\Windows\wjdwnulewnhqmaas.exe
    wjdwnulewnhqmaas.exe
    1⤵
    • Executes dropped EXE
    PID:5056
  • C:\Windows\xnkgakeavpmyxormkiy.exe
    xnkgakeavpmyxormkiy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3116
  • C:\Windows\xnkgakeavpmyxormkiy.exe
    xnkgakeavpmyxormkiy.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4836
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\windows\xnkgakeavpmyxormkiy.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:3068
  • C:\Windows\mbxslunicvrcaqsmjg.exe
    mbxslunicvrcaqsmjg.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1296
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\windows\mbxslunicvrcaqsmjg.exe*."
      2⤵
      • Executes dropped EXE
      PID:844
  • C:\Users\Admin\AppData\Local\Temp\kbzwrcxuqljwwosonmdb.exe
    C:\Users\Admin\AppData\Local\Temp\kbzwrcxuqljwwosonmdb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1972
  • C:\Users\Admin\AppData\Local\Temp\xnkgakeavpmyxormkiy.exe
    C:\Users\Admin\AppData\Local\Temp\xnkgakeavpmyxormkiy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4180
  • C:\Windows\kbzwrcxuqljwwosonmdb.exe
    kbzwrcxuqljwwosonmdb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\windows\kbzwrcxuqljwwosonmdb.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:4116
  • C:\Windows\drmgygysldyifuvok.exe
    drmgygysldyifuvok.exe
    1⤵
    • Executes dropped EXE
    PID:3932
  • C:\Users\Admin\AppData\Local\Temp\drmgygysldyifuvok.exe
    C:\Users\Admin\AppData\Local\Temp\drmgygysldyifuvok.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5436
  • C:\Windows\zrqokwsqnjiwxqvssskjh.exe
    zrqokwsqnjiwxqvssskjh.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1468
  • C:\Users\Admin\AppData\Local\Temp\wjdwnulewnhqmaas.exe
    C:\Users\Admin\AppData\Local\Temp\wjdwnulewnhqmaas.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:544
  • C:\Windows\zrqokwsqnjiwxqvssskjh.exe
    zrqokwsqnjiwxqvssskjh.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3228
    • C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
      "C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe" "c:\windows\zrqokwsqnjiwxqvssskjh.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:4076

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

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        Downloads

        axbefwxacdhageoqvaxbef.xac
        • Path C:\Program Files (x86)\axbefwxacdhageoqvaxbef.xac
        • Size 280B
        • SHA256 ce75b15976a5637d95ac5c8be24882c61dfa57779a53cc3e6517de0dd6adafe3
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        axbefwxacdhageoqvaxbef.xac
        • Path C:\Program Files (x86)\axbefwxacdhageoqvaxbef.xac
        • Size 280B
        • SHA256 be00b1cb20ed0e7f5c0270420fe43268f46158853c4c2c40317b0e354fab9852
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ujnenivletx.exe
        • Path C:\Users\Admin\AppData\Local\Temp\ujnenivletx.exe
        • Size 320KB
        • SHA256 16ebdf50300831ddc7aa8d7d52438745368673d663a025252b75e69ea510dc9b
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        xbmweck.exe
        • Path C:\Users\Admin\AppData\Local\Temp\xbmweck.exe
        • Size 712KB
        • SHA256 b60fcdfaac077f497b8c5ff6d4f3f9e6eb87cdb496ab9c628b06a7b795e5ccf4
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        axbefwxacdhageoqvaxbef.xac
        • Path C:\Users\Admin\AppData\Local\axbefwxacdhageoqvaxbef.xac
        • Size 280B
        • SHA256 066aea7ce699577dfb0d61128b17565def36f9b85674b59b89de8a505b0ce2c7
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rzocoqcqdpeizidqgwethtvhviujneniv.bjy
        • Path C:\Users\Admin\AppData\Local\rzocoqcqdpeizidqgwethtvhviujneniv.bjy
        • Size 4KB
        • SHA256 dcc2552b4ddee8e2a346a3700c1236613fb5f24c27e10ec9970dd31900c1d7dd
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        mbxslunicvrcaqsmjg.exe
        • Path C:\Windows\SysWOW64\mbxslunicvrcaqsmjg.exe
        • Size 1016KB
        • SHA256 19bfc62f4162a8399e6c22f14721710d96007e027aaa8154e3d80bb725c360e4
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        djwisscoz.bat
        • Path C:\djwisscoz.bat
        • Size 544KB
        • SHA256 75d9cbced62849c342ff0dc37b8d2d968e089ad9310113f97a05e4c2a6c6f1d2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download