Analysis

  • max time kernel
    148s
  • max time network
    147s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    10-05-2024 18:17

General

  • Target

    Chibldacfsxzsf.exe

  • Size

    894KB

  • MD5

    6850f1f6c863132bc4111613d5af8597

  • SHA1

    2f6ac44f7bbc9ecf4a0b791af3ad559481b369b0

  • SHA256

    49d61c568a1fc02a955bee79f81f4474d39a878b83072c12c0a8a1352659e1c0

  • SHA512

    ecb2ece1a470c9dac6be787d5fe8246fd8ac3528fc141a751477386a306ca12c479ba668e946c2caeaf456ffdfb299d10f3e16841e9829da76c4fdd883e80ffa

  • SSDEEP

    24576:Fs4e9k02lMgvVO4Zl3SMgI58BcGg2cvGj81rQGXE:FSk24Zl3SMgGCcGg2cvGj81rQGXE

Malware Config

Extracted

Family

remcos

Botnet

kc FILE

C2

91.223.3.151:4508

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-6ZM3S3

  • 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.

  • NirSoft MailPassView 3 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 2 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 7 IoCs
  • Executes dropped EXE 4 IoCs
  • 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 1 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Script User-Agent 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Chibldacfsxzsf.exe
    "C:\Users\Admin\AppData\Local\Temp\Chibldacfsxzsf.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3484
    • C:\Windows\SysWOW64\extrac32.exe
      C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\Chibldacfsxzsf.exe C:\\Users\\Public\\Libraries\\Chibldac.PIF
      2⤵
        PID:2744
      • C:\Users\Public\Libraries\cadlbihC.pif
        C:\Users\Public\Libraries\cadlbihC.pif
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3440
        • C:\Users\Public\Libraries\cadlbihC.pif
          C:\Users\Public\Libraries\cadlbihC.pif /stext "C:\Users\Admin\AppData\Local\Temp\rigvjimsxjdzunlblmeoaxchvbnni"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          PID:3900
        • C:\Users\Public\Libraries\cadlbihC.pif
          C:\Users\Public\Libraries\cadlbihC.pif /stext "C:\Users\Admin\AppData\Local\Temp\cklokbxulrvexbhfcxrqlkxqehxojcuh"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook accounts
          PID:2544
        • C:\Users\Public\Libraries\cadlbihC.pif
          C:\Users\Public\Libraries\cadlbihC.pif /stext "C:\Users\Admin\AppData\Local\Temp\meqg"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4072

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\ProgramData\remcos\logs.dat

      Filesize

      144B

      MD5

      eb8c1a99928aed30e20731b21b7877fd

      SHA1

      197beb7513c5716a461a18d0b5d8fd77f699f6ba

      SHA256

      e4dc7124c508dc471cf452b017f2994cf46813ae563c97c51bd2f7d6e5bb883b

      SHA512

      efa8034445409ab87ac3396677978298df5c3d2fd84a47e0d95d137325549020d445cbf74974170e8aea5b3d20eb79aaa209e9656fc36190a35fc9c61f9cc830

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

      Filesize

      4KB

      MD5

      cb998c648b6f4ad55a89eb482aac3598

      SHA1

      0965844779ba17661d18e216289ae0422777b689

      SHA256

      ea32319f2bc8d294d729b82a946fb2a0eedf37902a04c01efb5a75efbecdb395

      SHA512

      97dedfbc8ad9b6149a8e044669efb69539ba9f738b032aa2408e759dd16b86f86d9364af2f229c2fad70c8ede6a42767c5f112a2eb7452de6334ac2b34dc4124

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

      Filesize

      66KB

      MD5

      c116d3604ceafe7057d77ff27552c215

      SHA1

      452b14432fb5758b46f2897aeccd89f7c82a727d

      SHA256

      7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

      SHA512

      9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

    • memory/2544-31-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/2544-47-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/2544-33-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/2544-39-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/2544-28-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/3440-74-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-79-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-20-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-22-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-23-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-25-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-19-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-104-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-101-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-98-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-8-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-97-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-95-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-14-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-18-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-93-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-15-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-90-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-86-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-56-0x00000000332E0000-0x00000000332F9000-memory.dmp

      Filesize

      100KB

    • memory/3440-55-0x00000000332E0000-0x00000000332F9000-memory.dmp

      Filesize

      100KB

    • memory/3440-52-0x00000000332E0000-0x00000000332F9000-memory.dmp

      Filesize

      100KB

    • memory/3440-12-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-57-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-60-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-63-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-64-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-65-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-87-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-68-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-70-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-85-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3440-75-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-76-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-21-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3440-82-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3484-0-0x0000000000860000-0x0000000000861000-memory.dmp

      Filesize

      4KB

    • memory/3484-1-0x0000000000400000-0x00000000004E8000-memory.dmp

      Filesize

      928KB

    • memory/3900-49-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/3900-30-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/3900-32-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/3900-26-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4072-34-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/4072-37-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/4072-40-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/4072-36-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB