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Analysis

  • max time kernel
    152s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/11/2022, 18:34

General

  • Target

    79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe

  • Size

    356KB

  • MD5

    f88adb471749bf8d81a8cf4f751cfa33

  • SHA1

    9cfad677c8cdecab5292fceab6336d186cf12c11

  • SHA256

    79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf

  • SHA512

    85656a691ab29fa70d7ae048720ad41be2d901980885237d74d851bcdc3628b6a407f1cb2a672dbb271650b73439eccea5286aaf767be3a7902c035274bc371d

  • SSDEEP

    6144:If4c9En/SYAnpq8D6jtl7jYH3xgPRy1RbHmlwfyJvP:IAP4n8re36o1R5fy5

Malware Config

Signatures

  • ISR Stealer

    ISR Stealer is a modified version of Hackhound Stealer written in visual basic.

  • ISR Stealer payload 5 IoCs
  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • Nirsoft 2 IoCs
  • Executes dropped EXE 4 IoCs
  • UPX packed file 8 IoCs

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

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe
    "C:\Users\Admin\AppData\Local\Temp\79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4852
    • C:\Users\Admin\AppData\Local\Temp\79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe
      "C:\Users\Admin\AppData\Local\Temp\79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe"
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1724
      • C:\Users\Admin\AppData\Local\Temp\79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe
        /scomma "C:\Users\Admin\AppData\Local\Temp\4xGt5B1d24.ini"
        3⤵
          PID:3776
        • C:\Users\Admin\AppData\Local\Temp\79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf.exe
          /scomma "C:\Users\Admin\AppData\Local\Temp\qcyplvEpb2.ini"
          3⤵
          • Accesses Microsoft Outlook accounts
          PID:2776
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe"
        2⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4172
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe
          C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe
          3⤵
          • Executes dropped EXE
          • Checks computer location settings
          • Suspicious use of SetThreadContext
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4308
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe"
            4⤵
            • Executes dropped EXE
            PID:2684
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe"
            4⤵
            • Executes dropped EXE
            • Adds Run key to start application
            • Suspicious use of AdjustPrivilegeToken
            PID:3200

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\WUDHost.exe.log

      Filesize

      319B

      MD5

      824ba7b7eed8b900a98dd25129c4cd83

      SHA1

      54478770b2158000ef365591d42977cb854453a1

      SHA256

      d182dd648c92e41cd62dccc65f130c07f0a96c03b32f907c3d1218e9aa5bda03

      SHA512

      ae4f3a9673711ecb6cc5d06874c587341d5094803923b53b6e982278fa64549d7acf866de165e23750facd55da556b6794c0d32f129f4087529c73acd4ffb11e

    • C:\Users\Admin\AppData\Local\Temp\4xGt5B1d24.ini

      Filesize

      5B

      MD5

      d1ea279fb5559c020a1b4137dc4de237

      SHA1

      db6f8988af46b56216a6f0daf95ab8c9bdb57400

      SHA256

      fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

      SHA512

      720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe

      Filesize

      356KB

      MD5

      f88adb471749bf8d81a8cf4f751cfa33

      SHA1

      9cfad677c8cdecab5292fceab6336d186cf12c11

      SHA256

      79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf

      SHA512

      85656a691ab29fa70d7ae048720ad41be2d901980885237d74d851bcdc3628b6a407f1cb2a672dbb271650b73439eccea5286aaf767be3a7902c035274bc371d

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe

      Filesize

      356KB

      MD5

      f88adb471749bf8d81a8cf4f751cfa33

      SHA1

      9cfad677c8cdecab5292fceab6336d186cf12c11

      SHA256

      79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf

      SHA512

      85656a691ab29fa70d7ae048720ad41be2d901980885237d74d851bcdc3628b6a407f1cb2a672dbb271650b73439eccea5286aaf767be3a7902c035274bc371d

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Acctres.exe

      Filesize

      356KB

      MD5

      f88adb471749bf8d81a8cf4f751cfa33

      SHA1

      9cfad677c8cdecab5292fceab6336d186cf12c11

      SHA256

      79fcf6cfd0bf20b536c61dc493dd3db116eb82230699a821eb80bf310befdecf

      SHA512

      85656a691ab29fa70d7ae048720ad41be2d901980885237d74d851bcdc3628b6a407f1cb2a672dbb271650b73439eccea5286aaf767be3a7902c035274bc371d

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe

      Filesize

      11KB

      MD5

      6250064b24fd9175bdad1c147fe6f209

      SHA1

      9c777e8318c8967625a829551ce561453d88e964

      SHA256

      933fa76fbbaff480ee54c270901ded9da46b417502bd3e4062580a54f0a68084

      SHA512

      3db783ef0fb348cf9a354052f8f0e907bc91b6b5bf807aea22731f5710e81f0af1a44c29434fa9169187077e941a1990f57ba0ab10c51a5243bb67fcb57d0f48

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe

      Filesize

      11KB

      MD5

      6250064b24fd9175bdad1c147fe6f209

      SHA1

      9c777e8318c8967625a829551ce561453d88e964

      SHA256

      933fa76fbbaff480ee54c270901ded9da46b417502bd3e4062580a54f0a68084

      SHA512

      3db783ef0fb348cf9a354052f8f0e907bc91b6b5bf807aea22731f5710e81f0af1a44c29434fa9169187077e941a1990f57ba0ab10c51a5243bb67fcb57d0f48

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe

      Filesize

      11KB

      MD5

      6250064b24fd9175bdad1c147fe6f209

      SHA1

      9c777e8318c8967625a829551ce561453d88e964

      SHA256

      933fa76fbbaff480ee54c270901ded9da46b417502bd3e4062580a54f0a68084

      SHA512

      3db783ef0fb348cf9a354052f8f0e907bc91b6b5bf807aea22731f5710e81f0af1a44c29434fa9169187077e941a1990f57ba0ab10c51a5243bb67fcb57d0f48

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\WUDHost.exe

      Filesize

      11KB

      MD5

      6250064b24fd9175bdad1c147fe6f209

      SHA1

      9c777e8318c8967625a829551ce561453d88e964

      SHA256

      933fa76fbbaff480ee54c270901ded9da46b417502bd3e4062580a54f0a68084

      SHA512

      3db783ef0fb348cf9a354052f8f0e907bc91b6b5bf807aea22731f5710e81f0af1a44c29434fa9169187077e941a1990f57ba0ab10c51a5243bb67fcb57d0f48

    • memory/1724-152-0x0000000000400000-0x0000000000442000-memory.dmp

      Filesize

      264KB

    • memory/1724-135-0x0000000000400000-0x0000000000442000-memory.dmp

      Filesize

      264KB

    • memory/1724-137-0x0000000000400000-0x0000000000442000-memory.dmp

      Filesize

      264KB

    • memory/1724-149-0x0000000000400000-0x0000000000442000-memory.dmp

      Filesize

      264KB

    • memory/1724-177-0x0000000000400000-0x0000000000442000-memory.dmp

      Filesize

      264KB

    • memory/2776-175-0x0000000000400000-0x000000000041F000-memory.dmp

      Filesize

      124KB

    • memory/2776-176-0x0000000000400000-0x000000000041F000-memory.dmp

      Filesize

      124KB

    • memory/2776-172-0x0000000000400000-0x000000000041F000-memory.dmp

      Filesize

      124KB

    • memory/2776-174-0x0000000000400000-0x000000000041F000-memory.dmp

      Filesize

      124KB

    • memory/3200-170-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/3200-178-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/3776-145-0x0000000000400000-0x0000000000453000-memory.dmp

      Filesize

      332KB

    • memory/3776-144-0x0000000000400000-0x0000000000453000-memory.dmp

      Filesize

      332KB

    • memory/3776-141-0x0000000000400000-0x0000000000453000-memory.dmp

      Filesize

      332KB

    • memory/3776-143-0x0000000000400000-0x0000000000453000-memory.dmp

      Filesize

      332KB

    • memory/4172-150-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4172-153-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4172-160-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4308-157-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4308-158-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4852-132-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4852-159-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB

    • memory/4852-133-0x0000000074670000-0x0000000074C21000-memory.dmp

      Filesize

      5.7MB