Analysis

  • max time kernel
    150s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-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 2 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 3 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 8 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: 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:1524
    • 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:2852
      • C:\Users\Public\Libraries\cadlbihC.pif
        C:\Users\Public\Libraries\cadlbihC.pif
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3572
        • C:\Users\Public\Libraries\cadlbihC.pif
          C:\Users\Public\Libraries\cadlbihC.pif /stext "C:\Users\Admin\AppData\Local\Temp\hfzneiqeillzpbjsctxbmpbixl"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          PID:4168
        • C:\Users\Public\Libraries\cadlbihC.pif
          C:\Users\Public\Libraries\cadlbihC.pif /stext "C:\Users\Admin\AppData\Local\Temp\rhexeabgwtddahxwmwkdptwrfrjtg"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook accounts
          PID:4172
        • C:\Users\Public\Libraries\cadlbihC.pif
          C:\Users\Public\Libraries\cadlbihC.pif /stext "C:\Users\Admin\AppData\Local\Temp\ubkqftmzkcvqcvtadhwwagiiggtchkxq"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1376

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\ProgramData\remcos\logs.dat

      Filesize

      144B

      MD5

      f108f146496b6ed78c42a3737a6a4f50

      SHA1

      67ba5913d87d31f73639cc07ef0bbf9004e1c2cb

      SHA256

      c9294bd32ce4712fda8ec5e2ccd7279c46e8ca38fba0b8e49c9a3b1b58d8fea8

      SHA512

      60de58535eed0fa5cdc1e6c7f2dc6b382b1ffa2acc461712ffc1529d796e8f6d24cda3aa52ecf5c3ef4dad952330d58023aa5b85dffebeecfe2b5fe1a36f4e4f

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

      Filesize

      4KB

      MD5

      788d7419b32411807cc6753cbbccecbe

      SHA1

      761b99a1e5bc168f525181d78cff3f6ed82daa14

      SHA256

      76150e857b36f1f070422d2ad4df17f87454466348e4bfc158b028977378140b

      SHA512

      3003f104b0b07870015ff4e9e0d254c2e537d4c68ef664a772d7018827b0ccbeb5481a2ce587b88e6ab1d71d6ce523a620c11c00c676857d5fd5ab949fa617b4

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

      Filesize

      66KB

      MD5

      c116d3604ceafe7057d77ff27552c215

      SHA1

      452b14432fb5758b46f2897aeccd89f7c82a727d

      SHA256

      7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

      SHA512

      9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

    • memory/1376-42-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/1376-36-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/1376-43-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/1376-39-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/1376-45-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB

    • memory/1524-1-0x0000000000400000-0x00000000004E8000-memory.dmp

      Filesize

      928KB

    • memory/1524-0-0x0000000002290000-0x0000000002291000-memory.dmp

      Filesize

      4KB

    • memory/3572-73-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-62-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-22-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-25-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-106-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-20-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-103-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-21-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-100-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-19-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-18-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-99-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-12-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-98-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-94-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-92-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-88-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-89-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-54-0x000000004B100000-0x000000004B119000-memory.dmp

      Filesize

      100KB

    • memory/3572-58-0x000000004B100000-0x000000004B119000-memory.dmp

      Filesize

      100KB

    • memory/3572-57-0x000000004B100000-0x000000004B119000-memory.dmp

      Filesize

      100KB

    • memory/3572-13-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-59-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-23-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-65-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-66-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-67-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-15-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-70-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-8-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-76-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-77-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-78-0x0000000000400000-0x0000000001400000-memory.dmp

      Filesize

      16.0MB

    • memory/3572-80-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-84-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/3572-87-0x0000000000400000-0x0000000000482000-memory.dmp

      Filesize

      520KB

    • memory/4168-51-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4168-26-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4168-34-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4168-31-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4168-40-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4172-33-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/4172-29-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/4172-41-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/4172-35-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB