Overview

overview

10

Static

static

3

tmpvfrhow54.exe

windows10-ltsc_2021-x64

10

tmpvfrhow54.exe

windows10-2004-x64

10

tmpvfrhow54.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    22/05/2026, 15:21

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General

  • Target
    tmpvfrhow54.exe
  • Size 560KB
  • Sample260522-srmaaafv9p
  • SHA256 91c53cbeec6bc93467588bd0657b4f5d1bb0658c5c89bc28ad599c8931db80b4
  • 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 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 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 6 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\tmpvfrhow54.exe
    "C:\Users\Admin\AppData\Local\Temp\tmpvfrhow54.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4184
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\users\admin\appdata\local\temp\tmpvfrhow54.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:2132
      • C:\Users\Admin\AppData\Local\Temp\kvvhjt.exe
        "C:\Users\Admin\AppData\Local\Temp\kvvhjt.exe" "-C:\Users\Admin\AppData\Local\Temp\wrbxjdpgrjugpogy.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:4544
      • C:\Users\Admin\AppData\Local\Temp\kvvhjt.exe
        "C:\Users\Admin\AppData\Local\Temp\kvvhjt.exe" "-C:\Users\Admin\AppData\Local\Temp\wrbxjdpgrjugpogy.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:2864
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\users\admin\appdata\local\temp\tmpvfrhow54.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:1652
  • C:\Windows\explorer.exe
    Explorer.exe
    1⤵
    • Modifies registry class
    PID:1376
  • C:\Windows\zzopgfwsifvmaebysinnc.exe
    zzopgfwsifvmaebysinnc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:916
  • C:\Windows\kjxxnlbwlhwmzcyuncgf.exe
    kjxxnlbwlhwmzcyuncgf.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2780
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\windows\kjxxnlbwlhwmzcyuncgf.exe*."
      2⤵
      • Executes dropped EXE
      PID:3948
  • C:\Windows\wrbxjdpgrjugpogy.exe
    wrbxjdpgrjugpogy.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3988
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\windows\wrbxjdpgrjugpogy.exe*."
      2⤵
      • Executes dropped EXE
      PID:1468
  • C:\Users\Admin\AppData\Local\Temp\dzkhupcugzlyiibuk.exe
    C:\Users\Admin\AppData\Local\Temp\dzkhupcugzlyiibuk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4796
  • C:\Users\Admin\AppData\Local\Temp\xvihwticqlzoacxskyb.exe
    C:\Users\Admin\AppData\Local\Temp\xvihwticqlzoacxskyb.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2288
  • C:\Windows\dzkhupcugzlyiibuk.exe
    dzkhupcugzlyiibuk.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:2960
  • C:\Windows\zzopgfwsifvmaebysinnc.exe
    zzopgfwsifvmaebysinnc.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2824
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\windows\zzopgfwsifvmaebysinnc.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:1376
  • C:\Windows\kjxxnlbwlhwmzcyuncgf.exe
    kjxxnlbwlhwmzcyuncgf.exe
    1⤵
    • Executes dropped EXE
    PID:3856
  • C:\Users\Admin\AppData\Local\Temp\zzopgfwsifvmaebysinnc.exe
    C:\Users\Admin\AppData\Local\Temp\zzopgfwsifvmaebysinnc.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3348
  • C:\Users\Admin\AppData\Local\Temp\kjxxnlbwlhwmzcyuncgf.exe
    C:\Users\Admin\AppData\Local\Temp\kjxxnlbwlhwmzcyuncgf.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3256
  • C:\Windows\xvihwticqlzoacxskyb.exe
    xvihwticqlzoacxskyb.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2580
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\windows\xvihwticqlzoacxskyb.exe*."
      2⤵
      • Executes dropped EXE
      PID:4332
  • C:\Users\Admin\AppData\Local\Temp\wrbxjdpgrjugpogy.exe
    C:\Users\Admin\AppData\Local\Temp\wrbxjdpgrjugpogy.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4036
  • C:\Windows\xvihwticqlzoacxskyb.exe
    xvihwticqlzoacxskyb.exe
    1⤵
    • Executes dropped EXE
    PID:3760
  • C:\Windows\mjvthdrkxresdeysjw.exe
    mjvthdrkxresdeysjw.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2220
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\windows\mjvthdrkxresdeysjw.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:1612
  • C:\Windows\wrbxjdpgrjugpogy.exe
    wrbxjdpgrjugpogy.exe
    1⤵
    • Executes dropped EXE
    PID:1672
  • C:\Windows\mjvthdrkxresdeysjw.exe
    mjvthdrkxresdeysjw.exe
    1⤵
    • Executes dropped EXE
    PID:1176
  • C:\Windows\dzkhupcugzlyiibuk.exe
    dzkhupcugzlyiibuk.exe .
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4628
    • C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
      "C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe" "c:\windows\dzkhupcugzlyiibuk.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:3428
  • C:\Users\Admin\AppData\Local\Temp\mjvthdrkxresdeysjw.exe
    C:\Users\Admin\AppData\Local\Temp\mjvthdrkxresdeysjw.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:3980

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

        Query Registry

        1
        T1012

        System Information Discovery

        3
        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

        kvvhjt.exe
        • Path C:\Users\Admin\AppData\Local\Temp\kvvhjt.exe
        • Size 712KB
        • SHA256 6117d423ad30f25f4215fe13d02e5de5034b3b2d43e9d6830c8129b321e50812
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        lswqdqagvcg.exe
        • Path C:\Users\Admin\AppData\Local\Temp\lswqdqagvcg.exe
        • Size 320KB
        • SHA256 4d63adbff77643d585d3db0955244c5724e6eedfee8008478ea4f122c9ab0381
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        jroxwdcgejhgcotyayltqzyfe.glj
        • Path C:\Users\Admin\AppData\Local\jroxwdcgejhgcotyayltqzyfe.glj
        • Size 280B
        • SHA256 a57ce8cbb044f4b4a07338f95f0441a12f96d6b7923e780c91b31c54b9b9efb9
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ohpjtlvktjscjgwmzigzhbldnclbkubyoera.rzt
        • Path C:\Users\Admin\AppData\Local\ohpjtlvktjscjgwmzigzhbldnclbkubyoera.rzt
        • Size 4KB
        • SHA256 837a0859ab7a3ee863488d5e264c0c0f25b305b546dec3883f6db8715d5e7957
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        mjvthdrkxresdeysjw.exe
        • Path C:\Windows\SysWOW64\mjvthdrkxresdeysjw.exe
        • Size 560KB
        • SHA256 91c53cbeec6bc93467588bd0657b4f5d1bb0658c5c89bc28ad599c8931db80b4
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download