Analysis

  • max time kernel
    150s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    20-05-2022 12:47

General

  • Target

    2238e83f.exe

  • Size

    1.4MB

  • MD5

    abb0da45041a587897972066124a73fe

  • SHA1

    5a82eb5e9ef349e798fc930f077e15e5e692fe5c

  • SHA256

    2238e83f8febb5591c0c5416f5e81d17a4d6a061a05230c4765b9af3faa26845

  • SHA512

    10c81fcbd10a23a26ac80c31098d736ada5f015df5da146c4f32939c13f396085b22c74b24da69dd5b91836a4ab5744dfc5310aa284358b7a689ad73cc6a5e25

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

194.5.97.32:5890

Attributes
  • audio_folder

    audio

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    5

  • copy_file

    remcos.exe

  • copy_folder

    remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    remcos_oqkhxjzletgovfx

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screens

  • screenshot_path

    %AppData%

  • screenshot_time

    1

  • startup_value

    remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

  • take_screenshot_title

Signatures

  • Remcos

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

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Delays execution with timeout.exe 2 IoCs
  • Modifies Internet Explorer settings 1 TTPs 25 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2238e83f.exe
    "C:\Users\Admin\AppData\Local\Temp\2238e83f.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:880
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AEEAcgB0AC0AUwBsAEUAZQBQACAALQBzACAAMgAwAA==
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:956
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout 20
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1940
      • C:\Windows\SysWOW64\timeout.exe
        timeout 20
        3⤵
        • Delays execution with timeout.exe
        PID:1820
    • C:\Users\Admin\AppData\Local\Temp\2238e83f.exe
      C:\Users\Admin\AppData\Local\Temp\2238e83f.exe
      2⤵
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:580
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:1680
        • C:\Windows\SysWOW64\PING.EXE
          PING 127.0.0.1 -n 2
          4⤵
          • Runs ping.exe
          PID:824
        • C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
          "C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2032
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AEEAcgB0AC0AUwBsAEUAZQBQACAALQBzACAAMgAwAA==
            5⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:384
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c timeout 20
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1036
            • C:\Windows\SysWOW64\timeout.exe
              timeout 20
              6⤵
              • Delays execution with timeout.exe
              PID:752
          • C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
            C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
            5⤵
            • Executes dropped EXE
            • Adds Run key to start application
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:1104
            • C:\Program Files (x86)\Internet Explorer\iexplore.exe
              "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
              6⤵
                PID:860
                • C:\Program Files\Internet Explorer\iexplore.exe
                  "C:\Program Files\Internet Explorer\iexplore.exe" http://go.microsoft.com/fwlink/?prd=11324&pver=4.5&sbp=AppLaunch2&plcid=0x409&o1=SHIM_NOVERSION_FOUND&version=(null)&processName=iexplore.exe&platform=0009&osver=5&isServer=0&shimver=4.0.30319.0
                  7⤵
                  • Modifies Internet Explorer settings
                  • Suspicious use of FindShellTrayWindow
                  • Suspicious use of SetWindowsHookEx
                  PID:1604
                  • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
                    "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1604 CREDAT:275457 /prefetch:2
                    8⤵
                    • Modifies Internet Explorer settings
                    • Suspicious use of SetWindowsHookEx
                    PID:708

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Registry Run Keys / Startup Folder

    1
    T1060

    Defense Evasion

    Modify Registry

    2
    T1112

    Discovery

    System Information Discovery

    1
    T1082

    Remote System Discovery

    1
    T1018

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\Internet Explorer\imagestore\k007hrg\imagestore.dat
      Filesize

      21KB

      MD5

      a0e8a465aaf27955a03f0d48ff728888

      SHA1

      c01f487551bf423f16bdedf1ed9a6e19c8334df5

      SHA256

      7dd48f1e6925aefd0ecbe23a0f74ac1c73101adca887cafae20ecf44d7a9f577

      SHA512

      4d56359f192db7726b42c465c48f2f9260ab5de46cd693336228b2f590bb2f3b8299f322683825df97307cd901dc64b524e3b2e80cfa76dd0d0d041e62ac895f

    • C:\Users\Admin\AppData\Local\Temp\install.bat
      Filesize

      99B

      MD5

      76c1687d97dfdbcea62ef1490bec5001

      SHA1

      5f4d1aeafa7d840cde67b76f97416dd68efd1bed

      SHA256

      79f04ea049979ffd2232c459fdd57fae97a5255aea9b4a2c7dce7ead856f37a4

      SHA512

      da250f0628632a644f159d818a82a8b9cca8224e46843bddbe0f6f9c32a2d04f7736a620af49ab6d77616317ca7d68285e60043965fe86c03d940835bd30a925

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
      Filesize

      7KB

      MD5

      adc006654ca7120ccb34bbbbfaad38b8

      SHA1

      d09af0b69b2015f873af45c8262d52553de7bdf3

      SHA256

      faadc6d86c45aad6231b71f9c66cae229116d031a00a5d61ed928915d627706e

      SHA512

      96f4beb8c394be6635b235ccf11923ed313a65af1087de20e0afcd29344e1bf5604e829ddf9eea95b6dde0ba733e562e552063e8bc546eb70f24a29cb94d9063

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\hussan\hussan.exe
      Filesize

      1.4MB

      MD5

      abb0da45041a587897972066124a73fe

      SHA1

      5a82eb5e9ef349e798fc930f077e15e5e692fe5c

      SHA256

      2238e83f8febb5591c0c5416f5e81d17a4d6a061a05230c4765b9af3faa26845

      SHA512

      10c81fcbd10a23a26ac80c31098d736ada5f015df5da146c4f32939c13f396085b22c74b24da69dd5b91836a4ab5744dfc5310aa284358b7a689ad73cc6a5e25

    • C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
      Filesize

      1.4MB

      MD5

      abb0da45041a587897972066124a73fe

      SHA1

      5a82eb5e9ef349e798fc930f077e15e5e692fe5c

      SHA256

      2238e83f8febb5591c0c5416f5e81d17a4d6a061a05230c4765b9af3faa26845

      SHA512

      10c81fcbd10a23a26ac80c31098d736ada5f015df5da146c4f32939c13f396085b22c74b24da69dd5b91836a4ab5744dfc5310aa284358b7a689ad73cc6a5e25

    • C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
      Filesize

      1.4MB

      MD5

      abb0da45041a587897972066124a73fe

      SHA1

      5a82eb5e9ef349e798fc930f077e15e5e692fe5c

      SHA256

      2238e83f8febb5591c0c5416f5e81d17a4d6a061a05230c4765b9af3faa26845

      SHA512

      10c81fcbd10a23a26ac80c31098d736ada5f015df5da146c4f32939c13f396085b22c74b24da69dd5b91836a4ab5744dfc5310aa284358b7a689ad73cc6a5e25

    • C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
      Filesize

      1.4MB

      MD5

      abb0da45041a587897972066124a73fe

      SHA1

      5a82eb5e9ef349e798fc930f077e15e5e692fe5c

      SHA256

      2238e83f8febb5591c0c5416f5e81d17a4d6a061a05230c4765b9af3faa26845

      SHA512

      10c81fcbd10a23a26ac80c31098d736ada5f015df5da146c4f32939c13f396085b22c74b24da69dd5b91836a4ab5744dfc5310aa284358b7a689ad73cc6a5e25

    • \Users\Admin\AppData\Roaming\remcos\remcos.exe
      Filesize

      1.4MB

      MD5

      abb0da45041a587897972066124a73fe

      SHA1

      5a82eb5e9ef349e798fc930f077e15e5e692fe5c

      SHA256

      2238e83f8febb5591c0c5416f5e81d17a4d6a061a05230c4765b9af3faa26845

      SHA512

      10c81fcbd10a23a26ac80c31098d736ada5f015df5da146c4f32939c13f396085b22c74b24da69dd5b91836a4ab5744dfc5310aa284358b7a689ad73cc6a5e25

    • memory/384-88-0x0000000072490000-0x0000000072A3B000-memory.dmp
      Filesize

      5.7MB

    • memory/384-85-0x0000000000000000-mapping.dmp
    • memory/384-89-0x0000000072490000-0x0000000072A3B000-memory.dmp
      Filesize

      5.7MB

    • memory/580-66-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-68-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-69-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-70-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-71-0x000000000040FD88-mapping.dmp
    • memory/580-74-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-75-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-64-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/580-63-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/752-91-0x0000000000000000-mapping.dmp
    • memory/824-78-0x0000000000000000-mapping.dmp
    • memory/880-59-0x00000000086B0000-0x0000000008818000-memory.dmp
      Filesize

      1.4MB

    • memory/880-55-0x0000000075711000-0x0000000075713000-memory.dmp
      Filesize

      8KB

    • memory/880-54-0x0000000000B00000-0x0000000000C6E000-memory.dmp
      Filesize

      1.4MB

    • memory/880-62-0x0000000002280000-0x00000000022B4000-memory.dmp
      Filesize

      208KB

    • memory/956-56-0x0000000000000000-mapping.dmp
    • memory/956-58-0x0000000071100000-0x00000000716AB000-memory.dmp
      Filesize

      5.7MB

    • memory/1036-90-0x0000000000000000-mapping.dmp
    • memory/1104-101-0x000000000040FD88-mapping.dmp
    • memory/1104-105-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/1104-106-0x0000000000400000-0x0000000000417000-memory.dmp
      Filesize

      92KB

    • memory/1680-76-0x0000000000000000-mapping.dmp
    • memory/1820-61-0x0000000000000000-mapping.dmp
    • memory/1940-60-0x0000000000000000-mapping.dmp
    • memory/2032-83-0x0000000000F50000-0x00000000010BE000-memory.dmp
      Filesize

      1.4MB

    • memory/2032-81-0x0000000000000000-mapping.dmp