General

  • Target

    sample-1883356-3b888a8e45ed6b49ee04f1afaedfd167.zip

  • Size

    560KB

  • Sample

    240828-zrh17awapc

  • MD5

    82aad6ea4d38d503bd739c781baca785

  • SHA1

    5759d31c79906b72bc0d28780751e7208af697bc

  • SHA256

    2cadef5bccc2f5368e9a4f6a4b529c9981fb681dc7f3f9e47ce1a7cd5a07c7dc

  • SHA512

    2ce8444b6dafef979a232d682fea87d681433d8a4244f553648ffdfa5a9a97bf5bb85520010768c979ad6f6de86fb7a8843d0d1c83820547bbc29b684d114060

  • SSDEEP

    12288:ivJ3YOHNZHxwzgjemPUc/UzjqFhSe3tylRuOLF12VpY:KY2fHxwzgj52jq+e3cRuOhwY

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

192.3.101.172:9674

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

    Log

  • keylog_path

    %Temp%

  • mouse_option

    false

  • mutex

    Rmc-54ZTI0

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target

      Scan5437.xls

    • Size

      547KB

    • MD5

      227d73b67aed2a5ad8a006579b72c14d

    • SHA1

      a7737457a2dd79c9bfc86ea64d4b6182fc393666

    • SHA256

      c1758d87a43a553070581905031b40f65af98067dfb0a865625634b7159dafc2

    • SHA512

      cde6f17b8630d8bd389aadd902cd833ad4fc69055d0a299cd38630414e6e22a74135d78878811eed1b2703cdb01580f1c040dd2bab653843ce97894d5969f8bc

    • SSDEEP

      12288:IZ1GWVjZScJbyWKEVuqg2/6VnDIh7xOP1fJYWe/egIY4Fg3lh:IbrjZsWKElYnvtfw/ed

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • Remcos

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

    • Credentials from Password Stores: Credentials from Web Browsers

      Malicious Access or copy of Web Browser Credential store.

    • Detected Nirsoft tools

      Free utilities often used by attackers which can steal passwords, product keys, etc.

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • NirSoft MailPassView

      Password recovery tool for various email clients

    • NirSoft WebBrowserPassView

      Password recovery tool for various web browsers

    • Blocklisted process makes network request

    • Downloads MZ/PE file

    • Evasion via Device Credential Deployment

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Accesses Microsoft Outlook accounts

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Drops file in System32 directory

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks