Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/11/2024, 03:02

General

  • Target
    EzFN-Manager.exe
  • Size 3.8MB
  • Sample241128-djfefaylep
  • SHA256 f31b0285f3bccd657e9b591732186a807584901d2ab8924897fa679ed1b39a1b
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • skuld

C2
  • https://discord.com/api/webhooks/1309150098055495793/k9e9xgOw-6_C2plzzrJuXKnk0n6rjOfFwyNN15kYdvJC528Av5hMa6QHDC_kqeEBzjsS

Extracted

Family
  • xworm

Version
  • 5.0

C2
  • ezfn57.serveo.net:4782

Mutex
  • s6QNsQsMG6xRRrJT

Attributes
  • Install_directory

    %ProgramData%

  • install_file

    WinRar.exe

aes.plain

Signatures

  • Detect Xworm Payload 1 IoCs
  • Skuld family
  • Skuld stealer

    An info stealer written in Go lang.

  • Xworm

    Xworm is a remote access trojan written in C#.

  • Xworm family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 7 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Suspicious use of SetThreadContext 3 IoCs
  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 11 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\EzFN-Manager.exe
    "C:\Users\Admin\AppData\Local\Temp\EzFN-Manager.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4748
    • C:\Users\Admin\AppData\Roaming\WinRAR.exe
      "C:\Users\Admin\AppData\Roaming\WinRAR.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3752
      • C:\Users\Admin\AppData\Roaming\WinRAR.exe
        "C:\Users\Admin\AppData\Roaming\WinRAR.exe"
        3⤵
        • Checks computer location settings
        • Drops startup file
        • Executes dropped EXE
        • Adds Run key to start application
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1620
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\WinRAR.exe'
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2540
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'WinRAR.exe'
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4012
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\WinRar.exe'
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:212
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'WinRar.exe'
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2952
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "WinRar" /tr "C:\ProgramData\WinRar.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:3244
    • C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1788
      • C:\Windows\system32\attrib.exe
        attrib +h +s "C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe"
        3⤵
        • Views/modifies file attributes
        PID:1476
  • C:\ProgramData\WinRar.exe
    C:\ProgramData\WinRar.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2676
    • C:\ProgramData\WinRar.exe
      "C:\ProgramData\WinRar.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:3172
  • C:\ProgramData\WinRar.exe
    C:\ProgramData\WinRar.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3988
    • C:\ProgramData\WinRar.exe
      "C:\ProgramData\WinRar.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:4824

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        WinRAR.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\WinRAR.exe.log
        • Size 425B
        • SHA256 34ba0ab8d1850e7825763f413142a333ccbc05fa2b5499a28a7d27b8a1c5b4bb
        • MD5 SHA1 SHA512

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
        • Size 2KB
        • SHA256 6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 18KB
        • SHA256 0686f8a9f3c2ec3bbd0f18b22cc61fe2822df5a636f39a2cc54388e67cce67cb
        • MD5 SHA1 SHA512 SSDEEP

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 18KB
        • SHA256 5b25de0fb7da9862a5a806a34d7252b709f5648d6062e8e56d2d7d6aa9ac960b
        • MD5 SHA1 SHA512 SSDEEP

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 18KB
        • SHA256 7fce55f94ab146dcd96c91b5f1984dcd9e4458738f2b1974974cd4067f29dcbd
        • MD5 SHA1 SHA512 SSDEEP

        __PSScriptPolicyTest_3imrfm1z.3h3.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_3imrfm1z.3h3.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512

        Microsoft Teams.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe
        • Size 3.3MB
        • SHA256 589e6cc7481b257d46466116096f4df95a41daaca908a661a528dd3b658e4ea2
        • MD5 SHA1 SHA512 SSDEEP

        WinRAR.exe

        • Path C:\Users\Admin\AppData\Roaming\WinRAR.exe
        • Size 379KB
        • SHA256 fd1aa71f521f8d6bccda3129f55960d844e5b7dd2374476cc6693df4d1d7ebf7
        • MD5 SHA1 SHA512 SSDEEP

        memory/212-98-0x0000000005A00000-0x0000000005D54000-memory.dmp

        memory/212-107-0x000000006FDD0000-0x000000006FE1C000-memory.dmp

        memory/1620-27-0x0000000000400000-0x0000000000438000-memory.dmp

        memory/1620-31-0x0000000005160000-0x00000000051FC000-memory.dmp

        memory/1620-32-0x0000000005200000-0x0000000005266000-memory.dmp

        memory/1788-26-0x0000000000960000-0x00000000013C5000-memory.dmp

        memory/1788-22-0x0000000000960000-0x00000000013C5000-memory.dmp

        memory/2540-49-0x0000000006590000-0x00000000065C2000-memory.dmp

        memory/2540-66-0x0000000007500000-0x0000000007511000-memory.dmp

        memory/2540-46-0x0000000005B30000-0x0000000005E84000-memory.dmp

        memory/2540-47-0x0000000005FF0000-0x000000000600E000-memory.dmp

        memory/2540-48-0x0000000006010000-0x000000000605C000-memory.dmp

        memory/2540-33-0x00000000026B0000-0x00000000026E6000-memory.dmp

        memory/2540-50-0x000000006FDD0000-0x000000006FE1C000-memory.dmp

        memory/2540-60-0x00000000065E0000-0x00000000065FE000-memory.dmp

        memory/2540-61-0x00000000071F0000-0x0000000007293000-memory.dmp

        memory/2540-62-0x0000000007940000-0x0000000007FBA000-memory.dmp

        memory/2540-63-0x0000000007300000-0x000000000731A000-memory.dmp

        memory/2540-64-0x0000000007370000-0x000000000737A000-memory.dmp

        memory/2540-65-0x0000000007580000-0x0000000007616000-memory.dmp

        memory/2540-36-0x00000000058E0000-0x0000000005946000-memory.dmp

        memory/2540-67-0x0000000007530000-0x000000000753E000-memory.dmp

        memory/2540-68-0x0000000007540000-0x0000000007554000-memory.dmp

        memory/2540-69-0x0000000007640000-0x000000000765A000-memory.dmp

        memory/2540-70-0x0000000007620000-0x0000000007628000-memory.dmp

        memory/2540-35-0x0000000005840000-0x0000000005862000-memory.dmp

        memory/2540-34-0x00000000051E0000-0x0000000005808000-memory.dmp

        memory/2952-128-0x000000006FDD0000-0x000000006FE1C000-memory.dmp

        memory/3752-23-0x0000000074D5E000-0x0000000074D5F000-memory.dmp

        memory/3752-21-0x0000000000490000-0x00000000004F4000-memory.dmp

        memory/4012-79-0x0000000006290000-0x00000000065E4000-memory.dmp

        memory/4012-85-0x000000006FDD0000-0x000000006FE1C000-memory.dmp

        memory/4748-0-0x00007FF8A8573000-0x00007FF8A8575000-memory.dmp

        memory/4748-1-0x00000000006B0000-0x0000000000A86000-memory.dmp