Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-07-2024 17:04

General

  • Target

    IAENMAIL-A4-240717-0830-000090912_PDF.exe

  • Size

    2.2MB

  • MD5

    6c3b88c4675ff6cad62702925a3390f1

  • SHA1

    d7c0fdc2b3b92df96b5bcd7a390aa7312df086a5

  • SHA256

    a8e25a2520c09dd71e17afbde126f58514921c6d967a786bde096fafda08701a

  • SHA512

    ee611d1b240a25a02d8ea9ecca3deb943da34dfcb03a38c2e5d8b40a2cea60d4d4446f968b4af6dc6c9f21bd951b3023e16939ebd1fe0a3fd0867f6a0d143e4a

  • SSDEEP

    49152:qB1BRf3rOSzOzrFNj8e1KbWF8K7Vk3SZTH4OWOEkw/R8jDYWg16pb67Wy/Zz:aaRrFCI4v7p

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

103.198.26.25:96

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

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-IPUJM4

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Detected Nirsoft tools 3 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 1 IoCs

    Password recovery tool for various web browsers

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

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

  • 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
  • Suspicious use of SetThreadContext 4 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: MapViewOfSection 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 32 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\IAENMAIL-A4-240717-0830-000090912_PDF.exe
    "C:\Users\Admin\AppData\Local\Temp\IAENMAIL-A4-240717-0830-000090912_PDF.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4748
    • C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
      C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe Add-MpPreference -ExclusionPath $env:UserProfile
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2848
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
      2⤵
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of WriteProcessMemory
      PID:4180
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /stext "C:\Users\Admin\AppData\Local\Temp\saqazsgnefmnfkcihtndqjfra"
        3⤵
          PID:2400
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
          C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /stext "C:\Users\Admin\AppData\Local\Temp\saqazsgnefmnfkcihtndqjfra"
          3⤵
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          PID:2016
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
          C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /stext "C:\Users\Admin\AppData\Local\Temp\ucdkzkzhsnerhqqmqdzetwaijpul"
          3⤵
            PID:3868
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
            C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /stext "C:\Users\Admin\AppData\Local\Temp\ucdkzkzhsnerhqqmqdzetwaijpul"
            3⤵
            • Accesses Microsoft Outlook accounts
            • System Location Discovery: System Language Discovery
            PID:3392
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
            C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /stext "C:\Users\Admin\AppData\Local\Temp\fwjdavkiovwwremyhomyeanrsvmtotf"
            3⤵
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1712

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vsu35tef.2lp.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Local\Temp\saqazsgnefmnfkcihtndqjfra

        Filesize

        4KB

        MD5

        71e3611290752b1a114e303d84e3987f

        SHA1

        210794023f369235615743c802fce5055961ee6e

        SHA256

        5163d0e849d5d39f1e8beb9d13beea8240d532dff6f28433522148628007af06

        SHA512

        d0235dd58f9038009e44c4847535f2bb652f093418fdfd890c01b4b9d8981df3a31e4a89f9099c226becbfe8541015d60f6b852165241d08cb8795d93dd2eb09

      • memory/1712-40-0x0000000000400000-0x0000000000424000-memory.dmp

        Filesize

        144KB

      • memory/1712-37-0x0000000000400000-0x0000000000424000-memory.dmp

        Filesize

        144KB

      • memory/1712-33-0x0000000000400000-0x0000000000424000-memory.dmp

        Filesize

        144KB

      • memory/2016-35-0x0000000000400000-0x0000000000478000-memory.dmp

        Filesize

        480KB

      • memory/2016-31-0x0000000000400000-0x0000000000478000-memory.dmp

        Filesize

        480KB

      • memory/2016-41-0x0000000000400000-0x0000000000478000-memory.dmp

        Filesize

        480KB

      • memory/2016-39-0x0000000000400000-0x0000000000478000-memory.dmp

        Filesize

        480KB

      • memory/2848-16-0x00007FFF03BF0000-0x00007FFF046B1000-memory.dmp

        Filesize

        10.8MB

      • memory/2848-12-0x00007FFF03BF0000-0x00007FFF046B1000-memory.dmp

        Filesize

        10.8MB

      • memory/2848-11-0x00007FFF03BF0000-0x00007FFF046B1000-memory.dmp

        Filesize

        10.8MB

      • memory/2848-0-0x00007FFF03BF3000-0x00007FFF03BF5000-memory.dmp

        Filesize

        8KB

      • memory/2848-1-0x000001E7F2960000-0x000001E7F2982000-memory.dmp

        Filesize

        136KB

      • memory/3392-34-0x0000000000400000-0x0000000000462000-memory.dmp

        Filesize

        392KB

      • memory/3392-36-0x0000000000400000-0x0000000000462000-memory.dmp

        Filesize

        392KB

      • memory/3392-32-0x0000000000400000-0x0000000000462000-memory.dmp

        Filesize

        392KB

      • memory/4180-22-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-47-0x0000000010000000-0x0000000010019000-memory.dmp

        Filesize

        100KB

      • memory/4180-29-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-28-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-25-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-26-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-24-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-23-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-21-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-20-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-18-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-17-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-13-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-30-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-50-0x0000000010000000-0x0000000010019000-memory.dmp

        Filesize

        100KB

      • memory/4180-51-0x0000000010000000-0x0000000010019000-memory.dmp

        Filesize

        100KB

      • memory/4180-52-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-53-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-54-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-55-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-56-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-57-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-58-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-59-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB

      • memory/4180-60-0x0000000000400000-0x0000000000482000-memory.dmp

        Filesize

        520KB