Analysis

  • max time kernel
    143s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-02-2024 21:42

General

  • Target

    f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c.exe

  • Size

    2.4MB

  • MD5

    1414d0efbbb09adb1ba13bf4425674e2

  • SHA1

    6baa8796c4b669fbdcb6bcbdae2a54c83ddee8cc

  • SHA256

    f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c

  • SHA512

    73bb2737f9ef75661a038eac9c5921cd2e5260b4af032a0aa6950b322114181df541b6cb606490bc81bab152f43b5dc5104a7be142f0121da24f951f9fc2c776

  • SSDEEP

    49152:vgzFgXJBY8OQ7HnUjp3i1JNQvjJO0amGSNTgj8tff0JtvViqfKHv1uBERCZju:YzIjr7Hnspy1JNkKJSNTgaXOVGv1uSR5

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.

  • Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 5 IoCs
  • Detects executables built or packed with MPress PE compressor 15 IoCs
  • Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers 3 IoCs
  • Detects executables referencing many email and collaboration clients. Observed in information stealers 3 IoCs
  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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 6 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 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c.exe
    "C:\Users\Admin\AppData\Local\Temp\f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:3832
    • C:\Users\Admin\AppData\Local\Temp\f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c.exe
      "C:\Users\Admin\AppData\Local\Temp\f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of WriteProcessMemory
      PID:2416
      • 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
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of WriteProcessMemory
        PID:4236
        • 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:848
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            5⤵
              PID:4996
            • C:\ProgramData\vexplorers\vexplorers.exe
              C:\ProgramData\vexplorers\vexplorers.exe /stext "C:\Users\Admin\AppData\Local\Temp\gjwxvenwmvkvmwlfkcgaqrqzhemen"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              PID:3120
            • C:\ProgramData\vexplorers\vexplorers.exe
              C:\ProgramData\vexplorers\vexplorers.exe /stext "C:\Users\Admin\AppData\Local\Temp\ilbpoxxxadcixkhrtnbbbvliqkvnghqdy"
              5⤵
              • Executes dropped EXE
              • Accesses Microsoft Outlook accounts
              PID:4564
            • C:\ProgramData\vexplorers\vexplorers.exe
              C:\ProgramData\vexplorers\vexplorers.exe /stext "C:\Users\Admin\AppData\Local\Temp\tfgio"
              5⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:4356
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 848 -s 1480
              5⤵
              • Program crash
              PID:3756
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 848 -ip 848
      1⤵
        PID:4712

      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

      Query Registry

      1
      T1012

      System Information Discovery

      2
      T1082

      Collection

      Data from Local System

      1
      T1005

      Email Collection

      1
      T1114

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\vexplorers\vexplorers.exe
        Filesize

        2.4MB

        MD5

        1414d0efbbb09adb1ba13bf4425674e2

        SHA1

        6baa8796c4b669fbdcb6bcbdae2a54c83ddee8cc

        SHA256

        f99f95fa5cd8015a84c6aef4ce0444b5e26e8c6bff54c13335a4d1a92201418c

        SHA512

        73bb2737f9ef75661a038eac9c5921cd2e5260b4af032a0aa6950b322114181df541b6cb606490bc81bab152f43b5dc5104a7be142f0121da24f951f9fc2c776

      • C:\ProgramData\vexplorers\vexplorers.exe
        Filesize

        1.2MB

        MD5

        60d4e10277c0f32d3a0240a5767df8ec

        SHA1

        389b66ed4bd448d36ce941fa562116ee4a365e8a

        SHA256

        f19f4485315e7a43c9b6ebe38cb09605b94136da5783987ddd4f58aeaa18a924

        SHA512

        db607303f56f2b81eb7eb25e6c751a857fff171b9c1dcdfc055ad1c3cf02479c619c71d6a504377f9bdecae7eeadef9b8a7b75258b906c37f456a6f0eec0d4f0

      • C:\Users\Admin\AppData\Local\Temp\Purportedly\Savouriest.exe
        Filesize

        2.4MB

        MD5

        9b239b68e9ff7008816c0fd534955d86

        SHA1

        735ae81c75cc024f43d854dc431be7dd3d80ee48

        SHA256

        f2224345509ef4e1fe9b541a8a69747926deca67a5abb9369ff47fa4e6207aa4

        SHA512

        2cd197939a6a2f67bc6205fd7bde97cb5cfafaa8d8f5b311357c60eab09848e4022abb3ba4ef67f0940275552f056c7cf8dfd762cab13a0d6e31fdc322c3e117

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

        4KB

        MD5

        320830fb2990210b35d02eb559f1b3f2

        SHA1

        fba985836640a92e69c58c643929b75f7635ee33

        SHA256

        155c37d976ae56d6d9d7bed09e2802dade565be58b8af769b1e815ceb044c318

        SHA512

        6e0536d68bc7f2c053a02879aaabeabb390913028f5986be4d2c3eee67db27f1c9bf1675e33ef28bad5afb7c542070cdae31b31a1493328dc6e36c23a78a9073

      • C:\Users\Admin\AppData\Local\Temp\nsj438E.tmp\System.dll
        Filesize

        12KB

        MD5

        564bb0373067e1785cba7e4c24aab4bf

        SHA1

        7c9416a01d821b10b2eef97b80899d24014d6fc1

        SHA256

        7a9ddee34562cd3703f1502b5c70e99cd5bba15de2b6845a3555033d7f6cb2a5

        SHA512

        22c61a323cb9293d7ec5c7e7e60674d0e2f7b29d55be25eb3c128ea2cd7440a1400cee17c43896b996278007c0d247f331a9b8964e3a40a0eb1404a9596c4472

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Ordsproget\Occamistic\Cystolithiasis.Men
        Filesize

        227KB

        MD5

        99890cd335cfe57eabd5d8805cdda59b

        SHA1

        690022617a05a067ac8f1381a2db5ccc73206231

        SHA256

        112746845d67497aa742c0b13f82a1145cac510de10ca7112efac09385747b34

        SHA512

        e08062337327b864473db88f0320c2d10e53f289fd84ef2056bc5bf8e3b999cd91c40d61d0a89662178c843f420c5e84e7e09b4533ee659b14272bb38a02b680

      • memory/848-118-0x0000000035620000-0x0000000035639000-memory.dmp
        Filesize

        100KB

      • memory/848-77-0x0000000000490000-0x00000000016E4000-memory.dmp
        Filesize

        18.3MB

      • memory/848-76-0x00000000016F0000-0x0000000004729000-memory.dmp
        Filesize

        48.2MB

      • memory/848-75-0x0000000000490000-0x00000000016E4000-memory.dmp
        Filesize

        18.3MB

      • memory/848-115-0x0000000035620000-0x0000000035639000-memory.dmp
        Filesize

        100KB

      • memory/848-119-0x0000000000490000-0x00000000016E4000-memory.dmp
        Filesize

        18.3MB

      • memory/848-120-0x00000000016F0000-0x0000000004729000-memory.dmp
        Filesize

        48.2MB

      • memory/848-71-0x00000000016F0000-0x0000000004729000-memory.dmp
        Filesize

        48.2MB

      • memory/2416-47-0x0000000077AA1000-0x0000000077BC1000-memory.dmp
        Filesize

        1.1MB

      • memory/2416-38-0x0000000077AA1000-0x0000000077BC1000-memory.dmp
        Filesize

        1.1MB

      • memory/2416-67-0x00000000016F0000-0x0000000004729000-memory.dmp
        Filesize

        48.2MB

      • memory/2416-36-0x00000000016F0000-0x0000000004729000-memory.dmp
        Filesize

        48.2MB

      • memory/2416-57-0x0000000000490000-0x00000000016E4000-memory.dmp
        Filesize

        18.3MB

      • memory/2416-37-0x0000000077B28000-0x0000000077B29000-memory.dmp
        Filesize

        4KB

      • memory/2416-42-0x0000000000490000-0x00000000016E4000-memory.dmp
        Filesize

        18.3MB

      • memory/2416-41-0x0000000000490000-0x00000000016E4000-memory.dmp
        Filesize

        18.3MB

      • memory/2416-40-0x00000000016F0000-0x0000000004729000-memory.dmp
        Filesize

        48.2MB

      • memory/3120-86-0x0000000000400000-0x0000000000478000-memory.dmp
        Filesize

        480KB

      • memory/3120-100-0x0000000000400000-0x0000000000478000-memory.dmp
        Filesize

        480KB

      • memory/3120-92-0x0000000000400000-0x0000000000478000-memory.dmp
        Filesize

        480KB

      • memory/3120-112-0x0000000000400000-0x0000000000478000-memory.dmp
        Filesize

        480KB

      • memory/3832-32-0x00000000032B0000-0x00000000062E9000-memory.dmp
        Filesize

        48.2MB

      • memory/3832-33-0x00000000032B0000-0x00000000062E9000-memory.dmp
        Filesize

        48.2MB

      • memory/3832-34-0x0000000077AA1000-0x0000000077BC1000-memory.dmp
        Filesize

        1.1MB

      • memory/3832-35-0x0000000074790000-0x0000000074797000-memory.dmp
        Filesize

        28KB

      • memory/4236-72-0x00000000747E0000-0x00000000747E7000-memory.dmp
        Filesize

        28KB

      • memory/4236-70-0x0000000003170000-0x00000000061A9000-memory.dmp
        Filesize

        48.2MB

      • memory/4236-68-0x0000000003170000-0x00000000061A9000-memory.dmp
        Filesize

        48.2MB

      • memory/4356-109-0x0000000000400000-0x0000000000424000-memory.dmp
        Filesize

        144KB

      • memory/4356-105-0x0000000000400000-0x0000000000424000-memory.dmp
        Filesize

        144KB

      • memory/4356-102-0x0000000000400000-0x0000000000424000-memory.dmp
        Filesize

        144KB

      • memory/4356-94-0x0000000000400000-0x0000000000424000-memory.dmp
        Filesize

        144KB

      • memory/4564-103-0x0000000000400000-0x0000000000457000-memory.dmp
        Filesize

        348KB

      • memory/4564-95-0x0000000000400000-0x0000000000457000-memory.dmp
        Filesize

        348KB

      • memory/4564-96-0x0000000000400000-0x0000000000457000-memory.dmp
        Filesize

        348KB

      • memory/4564-88-0x0000000000400000-0x0000000000457000-memory.dmp
        Filesize

        348KB

      • memory/4564-93-0x0000000000400000-0x0000000000457000-memory.dmp
        Filesize

        348KB

      • memory/4996-84-0x0000000000400000-0x000000000048A000-memory.dmp
        Filesize

        552KB

      • memory/4996-83-0x0000000000400000-0x000000000048A000-memory.dmp
        Filesize

        552KB

      • memory/4996-121-0x0000000000400000-0x000000000048A000-memory.dmp
        Filesize

        552KB

      • memory/4996-81-0x0000000000400000-0x000000000048A000-memory.dmp
        Filesize

        552KB