Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220715-en
  • resource tags

    arch:x64arch:x86image:win7-20220715-enlocale:en-usos:windows7-x64system
  • submitted
    08-08-2022 19:37

General

  • Target

    c1fb3c03cd371463107058c6c2b3a23b234578fd7df330d85efce4c85bcee570.exe

  • Size

    1.0MB

  • MD5

    a2a39d65f598684ac9bdb3a88d85d670

  • SHA1

    81ae837a631e65953b246b75959873e16c91204b

  • SHA256

    c1fb3c03cd371463107058c6c2b3a23b234578fd7df330d85efce4c85bcee570

  • SHA512

    848f6ff70d0d95febd4118dc3a499563274be860b3ca2e210d5d6db16a9be3c7fad9e8a0b65f52634827f1799f024958e4ad55c184ed5f062808c0d59f3bac3f

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

www.varshtrade.com:2404

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

    notepad

  • mouse_option

    false

  • mutex

    notepad-TFQMB3

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • ModiLoader, DBatLoader

    ModiLoader is a Delphi loader that misuses cloud services to download other malicious families.

  • Remcos

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies system certificate store 2 TTPs 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c1fb3c03cd371463107058c6c2b3a23b234578fd7df330d85efce4c85bcee570.exe
    "C:\Users\Admin\AppData\Local\Temp\c1fb3c03cd371463107058c6c2b3a23b234578fd7df330d85efce4c85bcee570.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2000
    • C:\Windows\SysWOW64\SndVol.exe
      "C:\Windows\System32\SndVol.exe"
      2⤵
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1592

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Discovery

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/1592-57-0x0000000000000000-mapping.dmp
  • memory/1592-59-0x0000000050590000-0x000000005061C000-memory.dmp
    Filesize

    560KB

  • memory/1592-61-0x0000000050590000-0x000000005061C000-memory.dmp
    Filesize

    560KB

  • memory/1592-62-0x00000000033B0000-0x000000000342E000-memory.dmp
    Filesize

    504KB

  • memory/1592-63-0x00000000033B0000-0x000000000342E000-memory.dmp
    Filesize

    504KB

  • memory/2000-54-0x0000000076191000-0x0000000076193000-memory.dmp
    Filesize

    8KB