Overview

overview

10

Static

static

3

tmpszni3y8b.exe

windows10-ltsc_2021-x64

10

tmpszni3y8b.exe

windows10-2004-x64

10

tmpszni3y8b.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
    02/06/2026, 03:36

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General

  • Target
    tmpszni3y8b.exe
  • Size 656KB
  • Sample260602-d54ddsc13x
  • SHA256 9aab7948f428921efcc735e88e5adad78ff27a73e6cb2d54d9cfddae3286cf22
  • 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 38 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 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 44 IoCs
    defense_evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmpszni3y8b.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpszni3y8b.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3080
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\users\admin\appdata\local\temp\tmpszni3y8b.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:3236
      • C:\Users\Admin\AppData\Local\Temp\psyyfm.exe
        "C:\Users\Admin\AppData\Local\Temp\psyyfm.exe" "-C:\Users\Admin\AppData\Local\Temp\boeofwndqhivznvz.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 Location Discovery: System Language Discovery
        • System policy modification
        PID:5512
      • C:\Users\Admin\AppData\Local\Temp\psyyfm.exe
        "C:\Users\Admin\AppData\Local\Temp\psyyfm.exe" "-C:\Users\Admin\AppData\Local\Temp\boeofwndqhivznvz.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:5692
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\users\admin\appdata\local\temp\tmpszni3y8b.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:2164
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:2000
  • C:\Windows\cslysmgzpjndkbmtbsg.exe
    cslysmgzpjndkbmtbsg.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2548
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\windows\cslysmgzpjndkbmtbsg.exe*."
      2⤵
      • Executes dropped EXE
      PID:5516
  • C:\Windows\rgykdwphwpshndntaq.exe
    rgykdwphwpshndntaq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2316
  • C:\Windows\rgykdwphwpshndntaq.exe
    rgykdwphwpshndntaq.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4080
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\windows\rgykdwphwpshndntaq.exe*."
      2⤵
      • Executes dropped EXE
      PID:3368
  • C:\Windows\pgaojeztkfkbjbnvewlc.exe
    pgaojeztkfkbjbnvewlc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3748
  • C:\Users\Admin\AppData\Local\Temp\pgaojeztkfkbjbnvewlc.exe
    C:\Users\Admin\AppData\Local\Temp\pgaojeztkfkbjbnvewlc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3532
  • C:\Users\Admin\AppData\Local\Temp\ewrgcyuphdjbkdqzjcskf.exe
    C:\Users\Admin\AppData\Local\Temp\ewrgcyuphdjbkdqzjcskf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2872
  • C:\Windows\iwnyqiarfxznshqvb.exe
    iwnyqiarfxznshqvb.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2576
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\windows\iwnyqiarfxznshqvb.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:1740
  • C:\Windows\boeofwndqhivznvz.exe
    boeofwndqhivznvz.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4892
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\windows\boeofwndqhivznvz.exe*."
      2⤵
      • Executes dropped EXE
      PID:6044
  • C:\Users\Admin\AppData\Local\Temp\boeofwndqhivznvz.exe
    C:\Users\Admin\AppData\Local\Temp\boeofwndqhivznvz.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:1720
  • C:\Windows\iwnyqiarfxznshqvb.exe
    iwnyqiarfxznshqvb.exe
    1⤵
    • Executes dropped EXE
    PID:5876
  • C:\Users\Admin\AppData\Local\Temp\iwnyqiarfxznshqvb.exe
    C:\Users\Admin\AppData\Local\Temp\iwnyqiarfxznshqvb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5872
  • C:\Windows\cslysmgzpjndkbmtbsg.exe
    cslysmgzpjndkbmtbsg.exe
    1⤵
    • Executes dropped EXE
    PID:1332
  • C:\Windows\ewrgcyuphdjbkdqzjcskf.exe
    ewrgcyuphdjbkdqzjcskf.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5912
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\windows\ewrgcyuphdjbkdqzjcskf.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:5216
  • C:\Users\Admin\AppData\Local\Temp\cslysmgzpjndkbmtbsg.exe
    C:\Users\Admin\AppData\Local\Temp\cslysmgzpjndkbmtbsg.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4184
  • C:\Windows\boeofwndqhivznvz.exe
    boeofwndqhivznvz.exe
    1⤵
    • Executes dropped EXE
    PID:5132
  • C:\Users\Admin\AppData\Local\Temp\rgykdwphwpshndntaq.exe
    C:\Users\Admin\AppData\Local\Temp\rgykdwphwpshndntaq.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2320
  • C:\Windows\ewrgcyuphdjbkdqzjcskf.exe
    ewrgcyuphdjbkdqzjcskf.exe
    1⤵
    • Executes dropped EXE
    PID:1568
  • C:\Windows\pgaojeztkfkbjbnvewlc.exe
    pgaojeztkfkbjbnvewlc.exe .
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5268
    • C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe
      "C:\Users\Admin\AppData\Local\Temp\zhgpsrrajrq.exe" "c:\windows\pgaojeztkfkbjbnvewlc.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:3572

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

        psyyfm.exe
        • Path C:\Users\Admin\AppData\Local\Temp\psyyfm.exe
        • Size 704KB
        • SHA256 ff11312f8b6ba95291c629131173a330d7565fa8b358149d74fd3a4ebb360452
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

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

        biswhsdnufahfnpnmuzgqufqblsdyfdl.lks
        • Path C:\Users\Admin\AppData\Local\biswhsdnufahfnpnmuzgqufqblsdyfdl.lks
        • Size 3KB
        • SHA256 9580f91ee04c90e12ca22146fc1b857fb229e397a530b5f70b54b3cb2c00362e
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        gcbuuuutppzvifwjxuokj.ccc
        • Path C:\Users\Admin\AppData\Local\gcbuuuutppzvifwjxuokj.ccc
        • Size 272B
        • SHA256 b3238ab02beeb9c4556f66e1872346f18a4c5c35c0ba55750dc3315a1d7a7264
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        rgykdwphwpshndntaq.exe
        • Path C:\Windows\SysWOW64\rgykdwphwpshndntaq.exe
        • Size 656KB
        • SHA256 9aab7948f428921efcc735e88e5adad78ff27a73e6cb2d54d9cfddae3286cf22
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download