Analysis

  • max time kernel
    204s
  • max time network
    273s
  • platform
    windows11-21h2_x64
  • resource
    win11-20231215-en
  • resource tags

    arch:x64arch:x86image:win11-20231215-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    29-01-2024 07:44

General

  • Target

    75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d.exe

  • Size

    474KB

  • MD5

    25ba729a1538d68ad33fe36ca0548181

  • SHA1

    1f87157d8d29b9d40b0e1ad6eb4617ba684c8f1a

  • SHA256

    75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d

  • SHA512

    86816fb6b3157e397a43828fcdc8dd7c0488ad7e634c49ecd13c12e28c0a88872f40c50287a4a01200638906a6781c6a38f6349374dc91b3c3c6f1ba5dfefbf9

  • SSDEEP

    12288:6a7r+1Jt7W+FFqQ5xrW2nPD4EdaMAboDO:Fr+1T7W+7q+CCP8DqO

Malware Config

Extracted

Family

remcos

Botnet

2024

C2

72.11.158.94:1604

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    vexplorers.exe

  • copy_folder

    vexplorers

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-800RNZ

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Guloader,Cloudeye

    A shellcode based downloader first seen in 2020.

  • 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 7 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 5 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 6 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs
  • Suspicious use of SetThreadContext 7 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious behavior: MapViewOfSection 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d.exe
    "C:\Users\Admin\AppData\Local\Temp\75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Drops file in Windows directory
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:1128
    • C:\Users\Admin\AppData\Local\Temp\75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d.exe
      "C:\Users\Admin\AppData\Local\Temp\75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of WriteProcessMemory
      PID:4076
      • C:\ProgramData\vexplorers\vexplorers.exe
        "C:\ProgramData\vexplorers\vexplorers.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious use of SetThreadContext
        • Drops file in Windows directory
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of WriteProcessMemory
        PID:4876
        • C:\ProgramData\vexplorers\vexplorers.exe
          "C:\ProgramData\vexplorers\vexplorers.exe"
          4⤵
          • Loads dropped DLL
          • Adds Run key to start application
          • Suspicious use of NtCreateThreadExHideFromDebugger
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Suspicious use of SetThreadContext
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of WriteProcessMemory
          PID:4756
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            5⤵
              PID:4184
            • C:\ProgramData\vexplorers\vexplorers.exe
              C:\ProgramData\vexplorers\vexplorers.exe /stext "C:\Users\Admin\AppData\Local\Temp\qzfivi"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              PID:3440
            • C:\ProgramData\vexplorers\vexplorers.exe
              C:\ProgramData\vexplorers\vexplorers.exe /stext "C:\Users\Admin\AppData\Local\Temp\atkawazol"
              5⤵
              • Executes dropped EXE
              • Accesses Microsoft Outlook accounts
              PID:2104
            • C:\ProgramData\vexplorers\vexplorers.exe
              C:\ProgramData\vexplorers\vexplorers.exe /stext "C:\Users\Admin\AppData\Local\Temp\dnptxlkqzmln"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:2848
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe
              5⤵
                PID:1800
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 4756 -s 1500
                5⤵
                • Program crash
                PID:4260
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4756 -ip 4756
        1⤵
          PID:3788

        Network

        MITRE ATT&CK Matrix ATT&CK v13

        Persistence

        Boot or Logon Autostart Execution

        1
        T1547

        Registry Run Keys / Startup Folder

        1
        T1547.001

        Privilege Escalation

        Boot or Logon Autostart Execution

        1
        T1547

        Registry Run Keys / Startup Folder

        1
        T1547.001

        Defense Evasion

        Modify Registry

        1
        T1112

        Credential Access

        Unsecured Credentials

        1
        T1552

        Credentials In Files

        1
        T1552.001

        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\vexplorers\vexplorers.exe
          Filesize

          474KB

          MD5

          25ba729a1538d68ad33fe36ca0548181

          SHA1

          1f87157d8d29b9d40b0e1ad6eb4617ba684c8f1a

          SHA256

          75ef5c2c26d3ccc5719073b3a6f2e1a3124843ef91bf5b65f7afdab4a90f9d8d

          SHA512

          86816fb6b3157e397a43828fcdc8dd7c0488ad7e634c49ecd13c12e28c0a88872f40c50287a4a01200638906a6781c6a38f6349374dc91b3c3c6f1ba5dfefbf9

        • C:\Users\Admin\AppData\Local\Temp\nsv9490.tmp\System.dll
          Filesize

          11KB

          MD5

          3e6bf00b3ac976122f982ae2aadb1c51

          SHA1

          caab188f7fdc84d3fdcb2922edeeb5ed576bd31d

          SHA256

          4ff9b2678d698677c5d9732678f9cf53f17290e09d053691aac4cc6e6f595cbe

          SHA512

          1286f05e6a7e6b691f6e479638e7179897598e171b52eb3a3dc0e830415251069d29416b6d1ffc6d7dce8da5625e1479be06db9b7179e7776659c5c1ad6aa706

        • C:\Users\Admin\AppData\Local\Temp\qzfivi
          Filesize

          2B

          MD5

          f3b25701fe362ec84616a93a45ce9998

          SHA1

          d62636d8caec13f04e28442a0a6fa1afeb024bbb

          SHA256

          b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

          SHA512

          98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

        • C:\Users\Admin\AppData\Roaming\Besjlendes\Insistere.exe
          Filesize

          128KB

          MD5

          1ee4c57ea5c2bfa35e6bc624d4b8d27a

          SHA1

          0c2429930a1a59d6dbda5013e4b9fa991f9e8cd0

          SHA256

          2d3cd282ebdea6dda46d1e9fe2c5ff046da9a41ff5dce1459d333b94bd5b745a

          SHA512

          1db399882c6be14100ffd4b7f1e6951e8a4f3d7eeff72229fd9797e4c94d7de795cf14b7f21d1a0a929b727c41883bf3cbcdf1edd639bf8bda06f33542dacb6b

        • C:\Users\Admin\yawlsman\knowhow\Aktiveringens\Dmtes.Slk
          Filesize

          230KB

          MD5

          47892ca7d11ae43e15e895ba1e61ba17

          SHA1

          3ae126e2a8057b1d3c4f8b5f34ba241cdd7c750a

          SHA256

          ec8e421820c2d1c945d51e28bacdc59405d206e0638d48bb79a5ac76fd5b6fb6

          SHA512

          191c2d3f4ab0f88291044c076dc23a950a73af8d4b5cdf5a3b9a55437d40fa0d995229e4f2f4360e6233bd3acdb29a0bb792c429b970571de7cd3f5f32123d8c

        • memory/1128-19-0x0000000010000000-0x0000000010006000-memory.dmp
          Filesize

          24KB

        • memory/1128-17-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB

        • memory/1128-20-0x0000000002C20000-0x0000000005D22000-memory.dmp
          Filesize

          49.0MB

        • memory/1128-16-0x0000000002C20000-0x0000000005D22000-memory.dmp
          Filesize

          49.0MB

        • memory/1128-18-0x00000000770E1000-0x0000000077203000-memory.dmp
          Filesize

          1.1MB

        • memory/1800-94-0x0000000000400000-0x000000000049B000-memory.dmp
          Filesize

          620KB

        • memory/1800-104-0x0000000000400000-0x000000000049B000-memory.dmp
          Filesize

          620KB

        • memory/2104-84-0x0000000000400000-0x0000000000457000-memory.dmp
          Filesize

          348KB

        • memory/2104-92-0x0000000000400000-0x0000000000457000-memory.dmp
          Filesize

          348KB

        • memory/2104-80-0x0000000000400000-0x0000000000457000-memory.dmp
          Filesize

          348KB

        • memory/2104-100-0x0000000000400000-0x0000000000457000-memory.dmp
          Filesize

          348KB

        • memory/2848-105-0x0000000000400000-0x0000000000424000-memory.dmp
          Filesize

          144KB

        • memory/2848-103-0x0000000000400000-0x0000000000424000-memory.dmp
          Filesize

          144KB

        • memory/2848-85-0x0000000000400000-0x0000000000424000-memory.dmp
          Filesize

          144KB

        • memory/2848-99-0x0000000000400000-0x0000000000424000-memory.dmp
          Filesize

          144KB

        • memory/3440-83-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/3440-102-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/3440-108-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/3440-93-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/3440-76-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/4076-32-0x00000000770E1000-0x0000000077203000-memory.dmp
          Filesize

          1.1MB

        • memory/4076-26-0x00000000017C0000-0x00000000048C2000-memory.dmp
          Filesize

          49.0MB

        • memory/4076-54-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB

        • memory/4076-43-0x00000000004A0000-0x00000000017B7000-memory.dmp
          Filesize

          19.1MB

        • memory/4076-55-0x00000000017C0000-0x00000000048C2000-memory.dmp
          Filesize

          49.0MB

        • memory/4076-21-0x00000000017C0000-0x00000000048C2000-memory.dmp
          Filesize

          49.0MB

        • memory/4076-22-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB

        • memory/4076-27-0x00000000004A0000-0x00000000017B7000-memory.dmp
          Filesize

          19.1MB

        • memory/4076-23-0x0000000077178000-0x0000000077179000-memory.dmp
          Filesize

          4KB

        • memory/4076-24-0x00000000770E1000-0x0000000077203000-memory.dmp
          Filesize

          1.1MB

        • memory/4184-75-0x0000000000400000-0x000000000049B000-memory.dmp
          Filesize

          620KB

        • memory/4184-70-0x0000000000400000-0x000000000049B000-memory.dmp
          Filesize

          620KB

        • memory/4184-73-0x0000000000400000-0x000000000049B000-memory.dmp
          Filesize

          620KB

        • memory/4184-72-0x0000000000400000-0x000000000049B000-memory.dmp
          Filesize

          620KB

        • memory/4756-90-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB

        • memory/4756-65-0x00000000017C0000-0x00000000048C2000-memory.dmp
          Filesize

          49.0MB

        • memory/4756-117-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB

        • memory/4756-116-0x00000000017C0000-0x00000000048C2000-memory.dmp
          Filesize

          49.0MB

        • memory/4756-115-0x00000000004A0000-0x00000000017B7000-memory.dmp
          Filesize

          19.1MB

        • memory/4756-61-0x00000000017C0000-0x00000000048C2000-memory.dmp
          Filesize

          49.0MB

        • memory/4756-62-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB

        • memory/4756-79-0x00000000004A0000-0x00000000017B7000-memory.dmp
          Filesize

          19.1MB

        • memory/4756-111-0x00000000356F0000-0x0000000035709000-memory.dmp
          Filesize

          100KB

        • memory/4756-114-0x00000000356F0000-0x0000000035709000-memory.dmp
          Filesize

          100KB

        • memory/4876-56-0x00000000029E0000-0x0000000005AE2000-memory.dmp
          Filesize

          49.0MB

        • memory/4876-60-0x00000000029E0000-0x0000000005AE2000-memory.dmp
          Filesize

          49.0MB

        • memory/4876-58-0x0000000010000000-0x0000000010006000-memory.dmp
          Filesize

          24KB

        • memory/4876-57-0x00007FFCE0D20000-0x00007FFCE0F29000-memory.dmp
          Filesize

          2.0MB