General

  • Target

    31102024_0237_30102024_77954-668716095406000-20240826160944.pdf.gz

  • Size

    840KB

  • Sample

    241031-c4a5saxgpa

  • MD5

    8f1747742d3a1ed4b8ac22cfe9143980

  • SHA1

    8b82561ba439143af8e1e8606788d60c8efe2ed2

  • SHA256

    11628243191e0ea5350275ee991781c35ce22f93635c2a613bd0ae5f49e442f1

  • SHA512

    2e504ecc3970404b486df41958cabde9695ea51eb3d87b118f3fa5b07b2978d38597edc58b935da77a1a3bbb76cde01ac1f230a958b416e914b2644229d06a96

  • SSDEEP

    24576:O4z/H6uxAnCATgaAmJh6+YpAQePd5tS3afQFt:O4z/aaAntTgyYaFn03XFt

Malware Config

Extracted

Family

remcos

Botnet

Host

C2

oyo.work.gd:3142

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    vlc

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    pdf

  • mouse_option

    false

  • mutex

    jkm-I9KENP

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    ios

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target

      77954-668716095406000-20240826160944.pdf.exe

    • Size

      3.7MB

    • MD5

      9716314d2e2df9ef07b0a5e62594ec54

    • SHA1

      4b77033c3a9c5c897c288c57fb5c9c55d57236e9

    • SHA256

      7d9a4ed0a06ed9371e27c634f50c6aed4ebc1869c4a094287b03a6be4b810c63

    • SHA512

      5acac2ba47c101095d4b0efaf1737b6044977f9547a846f615be67f9bee77c5f6b1361b95308f26e311642ce39909510a0d80a35607d0571a5ca25b6a83b4ee3

    • SSDEEP

      24576:CgkzHf6uxcDC8VeaAOJ5o+cPugMB5jrgjafY9M:CgkzHyacDXVei+2FB0jj9M

    • Remcos

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

    • Remcos family

    • UAC bypass

    • Windows security bypass

    • Looks for VirtualBox Guest Additions in registry

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

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

    • Checks computer location settings

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

    • Windows security modification

    • Checks whether UAC is enabled

    • Maps connected drives based on registry

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks