Analysis

  • max time kernel
    142s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    28-11-2024 02:34

General

  • Target

    EzFN-Manager.exe

  • Size

    11.3MB

  • MD5

    4d909890fee721be5605f2b64bdf72fb

  • SHA1

    82fb1d4769025e27cda5e399ddbfb57b21e7b559

  • SHA256

    2abb6eefa29e46e8580cfb9f4eff67913423197ed103b694e4158e0e6ed2ba79

  • SHA512

    43aa1089f736c181d330e2adb1d6622d4f60ca6aac36206bc79e34e1330c945c64d139e9a59600cd17571d595cd1ed4a3f88e05b55f7abd6784f0c4eb22fc5de

  • SSDEEP

    196608:Sa1bPAaYyCtOPI1GIPxSYWnuOKVKxP19TjGe2g/CZqMlEkUb1zBzs:SnMPJIZSY2TKV29vGeTKZqMlEkUxzB

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

UoXEvvukylvflHuQ

Attributes
  • Install_directory

    %ProgramData%

  • install_file

    WinRar.exe

aes.plain

Signatures

  • Detect Xworm Payload 5 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 6 IoCs

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

  • Drops startup file 2 IoCs
  • Executes dropped EXE 7 IoCs
  • Loads dropped DLL 10 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 46 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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 4 IoCs

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

  • Drops file in Program Files directory 17 IoCs
  • Drops file in Windows directory 12 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 12 IoCs

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

  • Modifies data under HKEY_USERS 46 IoCs
  • Modifies registry class 35 IoCs
  • 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 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Users\Admin\AppData\Local\Temp\EzFN-Manager.exe
    "C:\Users\Admin\AppData\Local\Temp\EzFN-Manager.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:540
    • 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:2060
      • C:\Users\Admin\AppData\Roaming\WinRAR.exe
        "C:\Users\Admin\AppData\Roaming\WinRAR.exe"
        3⤵
        • Drops startup file
        • Executes dropped EXE
        • Loads dropped DLL
        • Adds Run key to start application
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2884
        • 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
          PID:2028
        • 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
          PID:2280
        • 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
          PID:1616
        • 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
          PID:1460
        • 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:1620
    • C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe"
      2⤵
      • Executes dropped EXE
      PID:1248
    • C:\Windows\System32\msiexec.exe
      "C:\Windows\System32\msiexec.exe" /i "C:\Users\Admin\AppData\Roaming\EZFN Launcher_1.2.7_x64_en-US (1).msi"
      2⤵
      • Enumerates connected drives
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      PID:2756
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Loads dropped DLL
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2784
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 57B6AA9FFC5FB22927302712E9515620 C
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      PID:484
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe -NoProfile -windowstyle hidden try { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 } catch {}; Invoke-WebRequest -Uri "https://go.microsoft.com/fwlink/p/?LinkId=2124703" -OutFile "$env:TEMP\MicrosoftEdgeWebview2Setup.exe" ; Start-Process -FilePath "$env:TEMP\MicrosoftEdgeWebview2Setup.exe" -ArgumentList ( '/install') -Wait
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      PID:2820
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
      PID:2140
    • C:\Windows\system32\DrvInst.exe
      DrvInst.exe "1" "200" "STORAGE\VolumeSnapshot\HarddiskVolumeSnapshot19" "" "" "61530dda3" "0000000000000000" "00000000000005D0" "0000000000000510"
      1⤵
      • Drops file in Windows directory
      • Modifies data under HKEY_USERS
      PID:1376
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {18D7F23E-AF95-4213-ADA4-C04F0C7FCC8C} S-1-5-21-1488793075-819845221-1497111674-1000:UPNECVIU\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1776
      • C:\ProgramData\WinRar.exe
        C:\ProgramData\WinRar.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2404
        • C:\ProgramData\WinRar.exe
          "C:\ProgramData\WinRar.exe"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2736
      • C:\ProgramData\WinRar.exe
        C:\ProgramData\WinRar.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        PID:2220
        • C:\ProgramData\WinRar.exe
          "C:\ProgramData\WinRar.exe"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2068

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\EZFN Launcher\EZFN Launcher.lnk

      Filesize

      2KB

      MD5

      f7bf25b6a66234643e5bb0ca966eee3b

      SHA1

      a86362e4b252c78a411a23313917fe1f2867dd1b

      SHA256

      d405c645ec1677a65243a9be98499711c6883c21be2b1f6a4204a5b4abb1a2f6

      SHA512

      270630ddecb9f32bf35b4be0184770306ba72e8ec2377362168d3eca93c09314f6201636784f547c628688e2d9024c1ec18022f9a946c69cde7960ea5656f113

    • C:\Users\Admin\AppData\Local\Temp\MSIA6C.tmp

      Filesize

      113KB

      MD5

      4fdd16752561cf585fed1506914d73e0

      SHA1

      f00023b9ae3c8ce5b7bb92f25011eaebe6f9d424

      SHA256

      aecd2d2fe766f6d439acc2bbf1346930ecc535012cf5ad7b3273d2875237b7e7

      SHA512

      3695e7eb1e35ec959243a91ab5b4454eb59aeef0f2699aa5de8e03de8fbb89f756a89130526da5c08815408cb700284a17936522ad2cad594c3e6e9d18a3f600

    • C:\Users\Admin\AppData\Roaming\EZFN Launcher_1.2.7_x64_en-US (1).msi

      Filesize

      7.5MB

      MD5

      1425a73d9d6db003b57bfc2134ea9d70

      SHA1

      d31866a0ccc44f2db6a17402f1219bf75e03b8e4

      SHA256

      b244361e1dac8d917be21d8e8453112c461f69ff3ec00e1844f6536379b8cd7f

      SHA512

      8c32528bf68329c497dfe4266355315e2a8f87a3a75b052738f04d7c1212a59374cdfdf6e63467bc80a9fb4f36f2134e738b5fe5aa738de1c9e736bd6bd18b6d

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

      Filesize

      7KB

      MD5

      83be3e1b79ad8f378b5b2fccee1fccf4

      SHA1

      06d8abccb3e0276592a07899690069d14c9f9199

      SHA256

      f28907f08544566b40da7a8596c5c9684bb7048d55ee78182dae64e12696663f

      SHA512

      84d4592a2f1a83be42bfc5e99c5c25f0c8bbcd1b676092e1119456117934348a9bae986e0b54136a8fbe49e79b3c0b6f6227394eae1bb8e71f0362cc9ddc611d

    • C:\Users\Admin\AppData\Roaming\WinRAR.exe

      Filesize

      379KB

      MD5

      a3c02411444ff8af6ed5d52ff10d21a6

      SHA1

      77d7160ebe781fae067b1dceae65912f501e213c

      SHA256

      4963d8ea74645cc1931e28c1e6a378bce443d0e719d54ba61a1e100a93cdba4f

      SHA512

      62b990f7f7efea5a63bdbddc59f916f63a7942fdc2d14c3321143f7a00bce56d7b67e1374a4403175f8cf7efa7d4cc59cf1b23982f3ac5bccb4726f04e3d1d8d

    • \??\PIPE\srvsvc

      MD5

      d41d8cd98f00b204e9800998ecf8427e

      SHA1

      da39a3ee5e6b4b0d3255bfef95601890afd80709

      SHA256

      e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

      SHA512

      cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

    • \Program Files\EZFN Launcher\EZFN Launcher.exe

      Filesize

      9.3MB

      MD5

      31e71c821bd9ee93c135711542481840

      SHA1

      4d937379cd0ef71657a125a8b1baea5bdf5b37bd

      SHA256

      49bf997c7c1b051828ac8f30467eb0e5e12fee50cebe34c9b2f8c938a2a6481d

      SHA512

      f591fe6c1bfeb1d24a86be87d45c926b0aad1b723a767186fd2ddff45b0af21075133a43e06e027340732bdc05220e3706e5610a8fc04be3d63d4696010a9883

    • \Users\Admin\AppData\Roaming\Microsoft Teams.exe

      Filesize

      3.3MB

      MD5

      ffa33049612a638a2f40c2a89722a6f4

      SHA1

      a453ea7f4c26dbe56d547988d8afe5fbf642e7df

      SHA256

      589e6cc7481b257d46466116096f4df95a41daaca908a661a528dd3b658e4ea2

      SHA512

      e7f05a846dd9cdf20f1330569974b4b2f677f34e74b32964836c6c38b6902c25109dea3259b64543a525a4af49bfb9011ad58365d6c597bc78f99f84aa79c927

    • memory/540-1-0x00000000010C0000-0x0000000001C0C000-memory.dmp

      Filesize

      11.3MB

    • memory/540-18-0x000000001C3A0000-0x000000001CE05000-memory.dmp

      Filesize

      10.4MB

    • memory/540-0-0x000007FEF5623000-0x000007FEF5624000-memory.dmp

      Filesize

      4KB

    • memory/540-20-0x000000001C3A0000-0x000000001CE05000-memory.dmp

      Filesize

      10.4MB

    • memory/1248-19-0x0000000000C40000-0x00000000016A5000-memory.dmp

      Filesize

      10.4MB

    • memory/1248-25-0x0000000000C40000-0x00000000016A5000-memory.dmp

      Filesize

      10.4MB

    • memory/2060-26-0x000000007412E000-0x000000007412F000-memory.dmp

      Filesize

      4KB

    • memory/2060-8-0x000000007412E000-0x000000007412F000-memory.dmp

      Filesize

      4KB

    • memory/2060-9-0x0000000001360000-0x00000000013C4000-memory.dmp

      Filesize

      400KB

    • memory/2404-157-0x00000000013D0000-0x0000000001434000-memory.dmp

      Filesize

      400KB

    • memory/2736-166-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2820-121-0x000000001B610000-0x000000001B8F2000-memory.dmp

      Filesize

      2.9MB

    • memory/2820-122-0x0000000002790000-0x0000000002798000-memory.dmp

      Filesize

      32KB

    • memory/2884-33-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB

    • memory/2884-27-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB

    • memory/2884-29-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB

    • memory/2884-31-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB

    • memory/2884-35-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2884-39-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB

    • memory/2884-36-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB

    • memory/2884-38-0x0000000000400000-0x0000000000438000-memory.dmp

      Filesize

      224KB