Analysis

  • max time kernel
    145s
  • max time network
    174s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    26-08-2021 12:15

General

  • Target

    PI_55034455.xlsx

  • Size

    1.3MB

  • MD5

    b677902aa5e2126451dc6258e35d99f5

  • SHA1

    2325d8d4c12de4fcd6b29c152cf4017983730198

  • SHA256

    4b2e04f07ddbbc25db9260eac2de0d8ce45488b3a2c80de9c384b1abb014bbbd

  • SHA512

    e7b2fb8dad97742f85aa935bcde585d1876c79600804f969c8667c2011250b194fb3dc2b505d444a8210590182b2213ace2c09e5fed7f9e370d955796f0fd8d8

Malware Config

Extracted

Family

xloader

Version

2.3

Campaign

ecuu

C2

http://www.polaritelibrairie.com/ecuu/

Decoy

buoy8boats.com

tomrings.com

o-distribs.com

majesticgroupinc.com

tehridam.com

yzwjtoys.com

castro-online.run

aquarius-twins.com

jamesrrossfineart.com

pavarasupatthonkol.com

rivermarketdentistry.com

gyiblrjd.icu

redcountrypodcast.com

youngbrotherspharmacyga.com

betsysobiech.com

neocleanpro.com

ingpatrimoine.com

mustangsallytransportation.com

jsvfcxzn.com

krsfpjuoekcd.info

Signatures

  • Xloader

    Xloader is a rebranded version of Formbook malware.

  • Xloader Payload 3 IoCs
  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 4 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 9 IoCs
  • Modifies registry key 1 TTPs 3 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 25 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 4 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 47 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:1196
    • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
      "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\PI_55034455.xlsx
      2⤵
      • Enumerates system info in registry
      • Modifies Internet Explorer settings
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious use of SetWindowsHookEx
      PID:736
    • C:\Windows\SysWOW64\explorer.exe
      "C:\Windows\SysWOW64\explorer.exe"
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1084
      • C:\Windows\SysWOW64\cmd.exe
        /c del "C:\Windows\SysWOW64\DpiScaling.exe"
        3⤵
          PID:1868
    • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
      "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
      1⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Launches Equation Editor
      • Suspicious use of WriteProcessMemory
      PID:1312
      • C:\Users\Public\vbc.exe
        "C:\Users\Public\vbc.exe"
        2⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:872
        • C:\Windows\SysWOW64\DpiScaling.exe
          C:\Windows\System32\DpiScaling.exe
          3⤵
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of AdjustPrivilegeToken
          PID:1620
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c ""C:\Users\Public\Trast.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:456
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /K C:\Users\Public\UKO.bat
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:908
            • C:\Windows\SysWOW64\reg.exe
              reg delete hkcu\Environment /v windir /f
              5⤵
              • Modifies registry key
              PID:1304
            • C:\Windows\SysWOW64\reg.exe
              reg add hkcu\Environment /v windir /d "cmd /c start /min C:\Users\Public\KDECO.bat reg delete hkcu\Environment /v windir /f && REM "
              5⤵
              • Modifies registry key
              PID:520
            • C:\Windows\SysWOW64\schtasks.exe
              schtasks /Run /TN \Microsoft\Windows\DiskCleanup\SilentCleanup /I
              5⤵
                PID:656
          • C:\Windows\SysWOW64\cmd.exe
            cmd /c ""C:\Users\Public\nest.bat" "
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:1500
            • C:\Windows\SysWOW64\reg.exe
              reg delete hkcu\Environment /v windir /f
              4⤵
              • Modifies registry key
              PID:1276

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Execution

      Scripting

      1
      T1064

      Exploitation for Client Execution

      1
      T1203

      Persistence

      Registry Run Keys / Startup Folder

      1
      T1060

      Defense Evasion

      Scripting

      1
      T1064

      Modify Registry

      3
      T1112

      Discovery

      Query Registry

      1
      T1012

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Public\Trast.bat
        MD5

        4068c9f69fcd8a171c67f81d4a952a54

        SHA1

        4d2536a8c28cdcc17465e20d6693fb9e8e713b36

        SHA256

        24222300c78180b50ed1f8361ba63cb27316ec994c1c9079708a51b4a1a9d810

        SHA512

        a64f9319acc51fffd0491c74dcd9c9084c2783b82f95727e4bfe387a8528c6dcf68f11418e88f1e133d115daf907549c86dd7ad866b2a7938add5225fbb2811d

      • C:\Users\Public\UKO.bat
        MD5

        eaf8d967454c3bbddbf2e05a421411f8

        SHA1

        6170880409b24de75c2dc3d56a506fbff7f6622c

        SHA256

        f35f2658455a2e40f151549a7d6465a836c33fa9109e67623916f889849eac56

        SHA512

        fe5be5c673e99f70c93019d01abb0a29dd2ecf25b2d895190ff551f020c28e7d8f99f65007f440f0f76c5bcac343b2a179a94d190c938ea3b9e1197890a412e9

      • C:\Users\Public\nest.bat
        MD5

        8ada51400b7915de2124baaf75e3414c

        SHA1

        1a7b9db12184ab7fd7fce1c383f9670a00adb081

        SHA256

        45aa3957c29865260a78f03eef18ae9aebdbf7bea751ecc88be4a799f2bb46c7

        SHA512

        9afc138157a4565294ca49942579cdb6f5d8084e56f9354738de62b585f4c0fa3e7f2cbc9541827f2084e3ff36c46eed29b46f5dd2444062ffcd05c599992e68

      • C:\Users\Public\vbc.exe
        MD5

        47fa27443cb1abe987ca9f653754b6d0

        SHA1

        886a56f419a6e4bc65c603089ee9e9d4f6ad7a54

        SHA256

        a9010421ea97c10ab6147e6c5077fab296030b13c26b6645502b6165e2e9d4db

        SHA512

        7dd0b2d5a3716a7ea88f4ca621dc55ec5e3d8a7111e3f373d4631dcdb17c858753e2c55e1723e8c16501ba0d86cc2778cb01bf3ffb791563aa014ef94142e4ac

      • C:\Users\Public\vbc.exe
        MD5

        47fa27443cb1abe987ca9f653754b6d0

        SHA1

        886a56f419a6e4bc65c603089ee9e9d4f6ad7a54

        SHA256

        a9010421ea97c10ab6147e6c5077fab296030b13c26b6645502b6165e2e9d4db

        SHA512

        7dd0b2d5a3716a7ea88f4ca621dc55ec5e3d8a7111e3f373d4631dcdb17c858753e2c55e1723e8c16501ba0d86cc2778cb01bf3ffb791563aa014ef94142e4ac

      • \Users\Public\vbc.exe
        MD5

        47fa27443cb1abe987ca9f653754b6d0

        SHA1

        886a56f419a6e4bc65c603089ee9e9d4f6ad7a54

        SHA256

        a9010421ea97c10ab6147e6c5077fab296030b13c26b6645502b6165e2e9d4db

        SHA512

        7dd0b2d5a3716a7ea88f4ca621dc55ec5e3d8a7111e3f373d4631dcdb17c858753e2c55e1723e8c16501ba0d86cc2778cb01bf3ffb791563aa014ef94142e4ac

      • \Users\Public\vbc.exe
        MD5

        47fa27443cb1abe987ca9f653754b6d0

        SHA1

        886a56f419a6e4bc65c603089ee9e9d4f6ad7a54

        SHA256

        a9010421ea97c10ab6147e6c5077fab296030b13c26b6645502b6165e2e9d4db

        SHA512

        7dd0b2d5a3716a7ea88f4ca621dc55ec5e3d8a7111e3f373d4631dcdb17c858753e2c55e1723e8c16501ba0d86cc2778cb01bf3ffb791563aa014ef94142e4ac

      • \Users\Public\vbc.exe
        MD5

        47fa27443cb1abe987ca9f653754b6d0

        SHA1

        886a56f419a6e4bc65c603089ee9e9d4f6ad7a54

        SHA256

        a9010421ea97c10ab6147e6c5077fab296030b13c26b6645502b6165e2e9d4db

        SHA512

        7dd0b2d5a3716a7ea88f4ca621dc55ec5e3d8a7111e3f373d4631dcdb17c858753e2c55e1723e8c16501ba0d86cc2778cb01bf3ffb791563aa014ef94142e4ac

      • \Users\Public\vbc.exe
        MD5

        47fa27443cb1abe987ca9f653754b6d0

        SHA1

        886a56f419a6e4bc65c603089ee9e9d4f6ad7a54

        SHA256

        a9010421ea97c10ab6147e6c5077fab296030b13c26b6645502b6165e2e9d4db

        SHA512

        7dd0b2d5a3716a7ea88f4ca621dc55ec5e3d8a7111e3f373d4631dcdb17c858753e2c55e1723e8c16501ba0d86cc2778cb01bf3ffb791563aa014ef94142e4ac

      • memory/456-78-0x0000000000000000-mapping.dmp
      • memory/520-84-0x0000000000000000-mapping.dmp
      • memory/656-85-0x0000000000000000-mapping.dmp
      • memory/736-103-0x000000005FFF0000-0x0000000060000000-memory.dmp
        Filesize

        64KB

      • memory/736-62-0x000000005FFF0000-0x0000000060000000-memory.dmp
        Filesize

        64KB

      • memory/736-61-0x0000000070F51000-0x0000000070F53000-memory.dmp
        Filesize

        8KB

      • memory/736-60-0x000000002F8B1000-0x000000002F8B4000-memory.dmp
        Filesize

        12KB

      • memory/872-72-0x0000000000220000-0x0000000000221000-memory.dmp
        Filesize

        4KB

      • memory/872-74-0x0000000000240000-0x000000000025B000-memory.dmp
        Filesize

        108KB

      • memory/872-68-0x0000000000000000-mapping.dmp
      • memory/908-81-0x0000000000000000-mapping.dmp
      • memory/1084-93-0x000000006BA21000-0x000000006BA23000-memory.dmp
        Filesize

        8KB

      • memory/1084-101-0x0000000000A40000-0x0000000000ACF000-memory.dmp
        Filesize

        572KB

      • memory/1084-91-0x0000000000000000-mapping.dmp
      • memory/1084-94-0x0000000000BC0000-0x0000000000E41000-memory.dmp
        Filesize

        2.5MB

      • memory/1084-96-0x0000000000080000-0x00000000000A9000-memory.dmp
        Filesize

        164KB

      • memory/1084-97-0x00000000023E0000-0x00000000026E3000-memory.dmp
        Filesize

        3.0MB

      • memory/1196-102-0x0000000004AE0000-0x0000000004C0E000-memory.dmp
        Filesize

        1.2MB

      • memory/1196-90-0x0000000006F60000-0x00000000070D9000-memory.dmp
        Filesize

        1.5MB

      • memory/1276-100-0x0000000000000000-mapping.dmp
      • memory/1304-83-0x0000000000000000-mapping.dmp
      • memory/1312-63-0x00000000757E1000-0x00000000757E3000-memory.dmp
        Filesize

        8KB

      • memory/1500-98-0x0000000000000000-mapping.dmp
      • memory/1620-77-0x0000000000000000-mapping.dmp
      • memory/1620-87-0x0000000010410000-0x0000000010439000-memory.dmp
        Filesize

        164KB

      • memory/1620-88-0x0000000002260000-0x0000000002563000-memory.dmp
        Filesize

        3.0MB

      • memory/1620-86-0x0000000000090000-0x0000000000091000-memory.dmp
        Filesize

        4KB

      • memory/1620-89-0x00000000001F0000-0x0000000000200000-memory.dmp
        Filesize

        64KB

      • memory/1868-95-0x0000000000000000-mapping.dmp