Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    02-12-2021 15:44

General

  • Target

    tmp/7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d.exe

  • Size

    586KB

  • MD5

    a9550bde032467d9349ee48c79b41940

  • SHA1

    4d320bd059ea70daf705c0e61c74953a559bf9c3

  • SHA256

    7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d

  • SHA512

    bf36ccb8ef0851b6db16a3503f0d67ceaa994cd1e6dce4831c3d5e71a92d8d705d6dc73f8c013b9659f9900a80f5eff0b5322a2f292c5d436f072e105148eeb5

Malware Config

Extracted

Family

remcos

Version

3.3.2 Pro

Botnet

HAX

C2

amlls.servegame.com:2404

Attributes
  • audio_folder

    MicRecords

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    Cortaned.exe

  • copy_folder

    Cortaned

  • delete_file

    false

  • hide_file

    true

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    winsrar

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remcos-6WFSKY

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Cortaned

  • take_screenshot_option

    false

  • take_screenshot_time

    5

  • take_screenshot_title

    notepad;solitaire;

Signatures

  • Remcos

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

  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 2 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 4 IoCs
  • Adds policy Run key to start application 2 TTPs 4 IoCs
  • Executes dropped EXE 6 IoCs
  • UPX packed file 4 IoCs

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

  • 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 12 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.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmp\7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp\7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d.exe"
    1⤵
    • Adds policy Run key to start application
    • Adds Run key to start application
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2640
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4044
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3996
        • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
          C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
          4⤵
          • Adds policy Run key to start application
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1020
          • \??\c:\program files\internet explorer\iexplore.exe
            "c:\program files\internet explorer\iexplore.exe"
            5⤵
              PID:3212
            • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
              C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe /stext "C:\Users\Admin\AppData\Local\Temp\tqifnrujbttkm"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              PID:952
            • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
              C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe /stext "C:\Users\Admin\AppData\Local\Temp\dsoxgjfloclpohpf"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:1180
            • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
              C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe /stext "C:\Users\Admin\AppData\Local\Temp\ombigcpfckdczvdraetn"
              5⤵
              • Executes dropped EXE
              • Accesses Microsoft Outlook accounts
              PID:2916
            • C:\Users\Admin\AppData\Roaming\Google Crash.exe
              "C:\Users\Admin\AppData\Roaming\Google Crash.exe"
              5⤵
              • Executes dropped EXE
              • Adds Run key to start application
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:1832
              • C:\ProgramData\Google Crash\Google Crash.exe
                "C:\ProgramData\Google Crash\Google Crash.exe"
                6⤵
                • Executes dropped EXE
                • Adds Run key to start application
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:4092

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Registry Run Keys / Startup Folder

    2
    T1060

    Defense Evasion

    Modify Registry

    2
    T1112

    Credential Access

    Credentials in Files

    1
    T1081

    Discovery

    System Information Discovery

    1
    T1082

    Collection

    Data from Local System

    1
    T1005

    Email Collection

    1
    T1114

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\ProgramData\Google Crash\Google Crash.exe
      MD5

      6217fe223315eefa8e2d1c7c1c9127fe

      SHA1

      e5e0380b0c57fb7f6a260e9af8eee0fa2baddfff

      SHA256

      b76ae56fc983d5bf90137961f7773fc365292afd7e646a420744ece4fa437089

      SHA512

      c0b464e768b5419e2ceb57661f755ccbb64f2a40f1d1f4e43e18cd87d64ed41da851b4c584702c846ac3eb057341086286fcbcafc7b12ce9407b759f8a70767c

    • C:\ProgramData\Google Crash\Google Crash.exe
      MD5

      6217fe223315eefa8e2d1c7c1c9127fe

      SHA1

      e5e0380b0c57fb7f6a260e9af8eee0fa2baddfff

      SHA256

      b76ae56fc983d5bf90137961f7773fc365292afd7e646a420744ece4fa437089

      SHA512

      c0b464e768b5419e2ceb57661f755ccbb64f2a40f1d1f4e43e18cd87d64ed41da851b4c584702c846ac3eb057341086286fcbcafc7b12ce9407b759f8a70767c

    • C:\Users\Admin\AppData\Local\Temp\install.vbs
      MD5

      008d4cf2659a5e8e8c8d69ef6e974725

      SHA1

      c4b038c5488a98d720a8bc5ace6fd73fce983f82

      SHA256

      2ea6012bbb8454696c1396d9ee2892a5d415b5cd3a07ff871be90acae1a9db25

      SHA512

      470f07bb5bbe9f367a3db0ebe6473b7420f94fd5cf980238349373160e9afb7b6c307e9641b34eff861206a13ebd8afcd77c84f587fdbd5a18986f2bb0ca6b08

    • C:\Users\Admin\AppData\Local\Temp\tqifnrujbttkm
      MD5

      5607a09fc866e8b1c39d38c0c9203c19

      SHA1

      d8d31295162fe66ff99426de635a0fb9e7247fd2

      SHA256

      2bb09a6f9850fd5353a5732b3909c92714d2b156fd30925ba8dee908a545fea9

      SHA512

      66ae386094b396e0f50c6bacea88360b04339843f91e843082802727711ebd425551297fb320564a2285ab4199e18eff97a70d60a9f9903fed4111244a205565

    • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
      MD5

      a9550bde032467d9349ee48c79b41940

      SHA1

      4d320bd059ea70daf705c0e61c74953a559bf9c3

      SHA256

      7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d

      SHA512

      bf36ccb8ef0851b6db16a3503f0d67ceaa994cd1e6dce4831c3d5e71a92d8d705d6dc73f8c013b9659f9900a80f5eff0b5322a2f292c5d436f072e105148eeb5

    • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
      MD5

      a9550bde032467d9349ee48c79b41940

      SHA1

      4d320bd059ea70daf705c0e61c74953a559bf9c3

      SHA256

      7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d

      SHA512

      bf36ccb8ef0851b6db16a3503f0d67ceaa994cd1e6dce4831c3d5e71a92d8d705d6dc73f8c013b9659f9900a80f5eff0b5322a2f292c5d436f072e105148eeb5

    • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
      MD5

      a9550bde032467d9349ee48c79b41940

      SHA1

      4d320bd059ea70daf705c0e61c74953a559bf9c3

      SHA256

      7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d

      SHA512

      bf36ccb8ef0851b6db16a3503f0d67ceaa994cd1e6dce4831c3d5e71a92d8d705d6dc73f8c013b9659f9900a80f5eff0b5322a2f292c5d436f072e105148eeb5

    • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
      MD5

      a9550bde032467d9349ee48c79b41940

      SHA1

      4d320bd059ea70daf705c0e61c74953a559bf9c3

      SHA256

      7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d

      SHA512

      bf36ccb8ef0851b6db16a3503f0d67ceaa994cd1e6dce4831c3d5e71a92d8d705d6dc73f8c013b9659f9900a80f5eff0b5322a2f292c5d436f072e105148eeb5

    • C:\Users\Admin\AppData\Roaming\Cortaned\Cortaned.exe
      MD5

      a9550bde032467d9349ee48c79b41940

      SHA1

      4d320bd059ea70daf705c0e61c74953a559bf9c3

      SHA256

      7296c8e94ad4a0674983a5903323466eb380a337d100d092a82e767cc410627d

      SHA512

      bf36ccb8ef0851b6db16a3503f0d67ceaa994cd1e6dce4831c3d5e71a92d8d705d6dc73f8c013b9659f9900a80f5eff0b5322a2f292c5d436f072e105148eeb5

    • C:\Users\Admin\AppData\Roaming\Google Crash.exe
      MD5

      6217fe223315eefa8e2d1c7c1c9127fe

      SHA1

      e5e0380b0c57fb7f6a260e9af8eee0fa2baddfff

      SHA256

      b76ae56fc983d5bf90137961f7773fc365292afd7e646a420744ece4fa437089

      SHA512

      c0b464e768b5419e2ceb57661f755ccbb64f2a40f1d1f4e43e18cd87d64ed41da851b4c584702c846ac3eb057341086286fcbcafc7b12ce9407b759f8a70767c

    • C:\Users\Admin\AppData\Roaming\Google Crash.exe
      MD5

      6217fe223315eefa8e2d1c7c1c9127fe

      SHA1

      e5e0380b0c57fb7f6a260e9af8eee0fa2baddfff

      SHA256

      b76ae56fc983d5bf90137961f7773fc365292afd7e646a420744ece4fa437089

      SHA512

      c0b464e768b5419e2ceb57661f755ccbb64f2a40f1d1f4e43e18cd87d64ed41da851b4c584702c846ac3eb057341086286fcbcafc7b12ce9407b759f8a70767c

    • memory/952-130-0x0000000000400000-0x0000000000478000-memory.dmp
      Filesize

      480KB

    • memory/952-121-0x0000000000400000-0x0000000000478000-memory.dmp
      Filesize

      480KB

    • memory/952-137-0x0000000000400000-0x0000000000478000-memory.dmp
      Filesize

      480KB

    • memory/952-122-0x0000000000476274-mapping.dmp
    • memory/1020-118-0x0000000000000000-mapping.dmp
    • memory/1180-136-0x0000000000400000-0x0000000000424000-memory.dmp
      Filesize

      144KB

    • memory/1180-124-0x0000000000400000-0x0000000000424000-memory.dmp
      Filesize

      144KB

    • memory/1180-128-0x0000000000400000-0x0000000000424000-memory.dmp
      Filesize

      144KB

    • memory/1180-125-0x0000000000422206-mapping.dmp
    • memory/1832-133-0x0000000000000000-mapping.dmp
    • memory/2916-129-0x0000000000455238-mapping.dmp
    • memory/2916-138-0x0000000000400000-0x0000000000457000-memory.dmp
      Filesize

      348KB

    • memory/2916-127-0x0000000000400000-0x0000000000457000-memory.dmp
      Filesize

      348KB

    • memory/2916-132-0x0000000000400000-0x0000000000457000-memory.dmp
      Filesize

      348KB

    • memory/3996-117-0x0000000000000000-mapping.dmp
    • memory/4044-115-0x0000000000000000-mapping.dmp
    • memory/4092-139-0x0000000000000000-mapping.dmp