Overview

overview

10

Static

static

3

tmpjbiratrl.exe

windows10-ltsc_2021-x64

10

tmpjbiratrl.exe

windows10-2004-x64

10

tmpjbiratrl.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, 14:35

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General

  • Target
    tmpjbiratrl.exe
  • Size 1016KB
  • Sample260522-rxzbcsd16m
  • SHA256 38dd400b380fad264dcfce3a49e1e3bac252db96338e11d6c7e0d4d1e696b6f2
  • 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 36 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 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 10 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 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\tmpjbiratrl.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpjbiratrl.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2708
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\users\admin\appdata\local\temp\tmpjbiratrl.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:1816
      • C:\Users\Admin\AppData\Local\Temp\aimty.exe
        "C:\Users\Admin\AppData\Local\Temp\aimty.exe" "-C:\Users\Admin\AppData\Local\Temp\xqfxnxqjxvkcbcfj.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:2468
      • C:\Users\Admin\AppData\Local\Temp\aimty.exe
        "C:\Users\Admin\AppData\Local\Temp\aimty.exe" "-C:\Users\Admin\AppData\Local\Temp\xqfxnxqjxvkcbcfj.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:5100
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\users\admin\appdata\local\temp\tmpjbiratrl.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:2716
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:3988
  • C:\Windows\libxrfczrtmilqxftnkd.exe
    libxrfczrtmilqxftnkd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4872
  • C:\Users\Admin\AppData\Local\Temp\niztlxsndduopsxdph.exe
    C:\Users\Admin\AppData\Local\Temp\niztlxsndduopsxdph.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2776
  • C:\Windows\eyohyjdxmlbuuwafq.exe
    eyohyjdxmlbuuwafq.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4376
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\eyohyjdxmlbuuwafq.exe*."
      2⤵
      • Executes dropped EXE
      PID:2568
  • C:\Windows\xqfxnxqjxvkcbcfj.exe
    xqfxnxqjxvkcbcfj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3372
  • C:\Users\Admin\AppData\Local\Temp\yumhanjfwxpkmqwdqjf.exe
    C:\Users\Admin\AppData\Local\Temp\yumhanjfwxpkmqwdqjf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3416
  • C:\Windows\eyohyjdxmlbuuwafq.exe
    eyohyjdxmlbuuwafq.exe
    1⤵
    • Executes dropped EXE
    PID:4808
  • C:\Windows\yumhanjfwxpkmqwdqjf.exe
    yumhanjfwxpkmqwdqjf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2820
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\yumhanjfwxpkmqwdqjf.exe*."
      2⤵
      • Executes dropped EXE
      PID:560
  • C:\Windows\libxrfczrtmilqxftnkd.exe
    libxrfczrtmilqxftnkd.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:708
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\libxrfczrtmilqxftnkd.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:4488
  • C:\Windows\xqfxnxqjxvkcbcfj.exe
    xqfxnxqjxvkcbcfj.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3676
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\xqfxnxqjxvkcbcfj.exe*."
      2⤵
      • Executes dropped EXE
      PID:3360
  • C:\Windows\niztlxsndduopsxdph.exe
    niztlxsndduopsxdph.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2756
  • C:\Windows\ayspkzxvorlimsajytrli.exe
    ayspkzxvorlimsajytrli.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4844
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\ayspkzxvorlimsajytrli.exe*."
      2⤵
      • Executes dropped EXE
      PID:2776
  • C:\Users\Admin\AppData\Local\Temp\xqfxnxqjxvkcbcfj.exe
    C:\Users\Admin\AppData\Local\Temp\xqfxnxqjxvkcbcfj.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2864
  • C:\Users\Admin\AppData\Local\Temp\eyohyjdxmlbuuwafq.exe
    C:\Users\Admin\AppData\Local\Temp\eyohyjdxmlbuuwafq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1200
  • C:\Users\Admin\AppData\Local\Temp\libxrfczrtmilqxftnkd.exe
    C:\Users\Admin\AppData\Local\Temp\libxrfczrtmilqxftnkd.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4284
  • C:\Windows\ayspkzxvorlimsajytrli.exe
    ayspkzxvorlimsajytrli.exe
    1⤵
    • Executes dropped EXE
    PID:3312
  • C:\Windows\niztlxsndduopsxdph.exe
    niztlxsndduopsxdph.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2612
    • C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
      "C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe" "c:\windows\niztlxsndduopsxdph.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:3008
  • C:\Windows\yumhanjfwxpkmqwdqjf.exe
    yumhanjfwxpkmqwdqjf.exe
    1⤵
    • Executes dropped EXE
    PID:1076
  • C:\Users\Admin\AppData\Local\Temp\ayspkzxvorlimsajytrli.exe
    C:\Users\Admin\AppData\Local\Temp\ayspkzxvorlimsajytrli.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4240

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

        fklprnsxxhimxkzplnstxzva.fpq
        • Path C:\Program Files (x86)\fklprnsxxhimxkzplnstxzva.fpq
        • Size 280B
        • SHA256 81c4239e4a47b8b61cb7c665e0664fae77f1c5c6010c7bc7f9dd9fd0e2f5a0de
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fklprnsxxhimxkzplnstxzva.fpq
        • Path C:\Program Files (x86)\fklprnsxxhimxkzplnstxzva.fpq
        • Size 280B
        • SHA256 95359848df6ffa6f114c34e57da318d01ebf966d9ce26762ff0d601ab365092d
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        fklprnsxxhimxkzplnstxzva.fpq
        • Path C:\Program Files (x86)\fklprnsxxhimxkzplnstxzva.fpq
        • Size 280B
        • SHA256 1bab1783d02dd7636e3a4fe6d283c5a1bade99a0a9a6bb154fb47c160a624bfa
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        aimty.exe
        • Path C:\Users\Admin\AppData\Local\Temp\aimty.exe
        • Size 708KB
        • SHA256 cc67711a2511fa14d0adfa78d2aada04e973f34c703e2ba992ac3c3988967d32
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        cmztpnmrmwj.exe
        • Path C:\Users\Admin\AppData\Local\Temp\cmztpnmrmwj.exe
        • Size 320KB
        • SHA256 1d3a55bc544fac6c763afaef0d6ae23425bbab40072b587184bf8de2d29691e8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fklprnsxxhimxkzplnstxzva.fpq
        • Path C:\Users\Admin\AppData\Local\fklprnsxxhimxkzplnstxzva.fpq
        • Size 280B
        • SHA256 0829741b6af990b141d2c118099677943116b2a91d0aa685f0c465174ccb93bb
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        oeqfszpfqlxmigghobrdsfmcsdykzvttubo.qfs
        • Path C:\Users\Admin\AppData\Local\oeqfszpfqlxmigghobrdsfmcsdykzvttubo.qfs
        • Size 4KB
        • SHA256 e7fb6b25ca4ca070320526e02784222bc157e6ac7a6debfd408f9ea05c1b6cf6
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        niztlxsndduopsxdph.exe
        • Path C:\Windows\SysWOW64\niztlxsndduopsxdph.exe
        • Size 1016KB
        • SHA256 38dd400b380fad264dcfce3a49e1e3bac252db96338e11d6c7e0d4d1e696b6f2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        yioxefp.bat
        • Path C:\yioxefp.bat
        • Size 520KB
        • SHA256 366d70bd7e95827aa258d3f2d428850a1bceab6b225a56f94f63b816e8cb1186
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download