Analysis

  • max time kernel
    82s
  • max time network
    82s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    11/05/2021, 10:11

General

  • Target

    a26ad0702fa8eb51a2e8337372bf1718383060c24979242e505dcf915b01fb1c.exe

  • Size

    2.8MB

  • MD5

    5acbc07010e56263682b0a59f0005794

  • SHA1

    a9bbf6ea962979daebeceab63d27a37a3c32e5ac

  • SHA256

    a26ad0702fa8eb51a2e8337372bf1718383060c24979242e505dcf915b01fb1c

  • SHA512

    c398af2f5e7020f4be17d36c9c2a57090f23ad73c86079df4db414157397ed48fa3195335dec7964fb91a74fa4728c995a4594bb1463ffb18b57b5e6d32a2d31

Malware Config

Signatures

  • CryptBot

    A C++ stealer distributed widely in bundle with other software.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Deletes itself 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Themida packer 1 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a26ad0702fa8eb51a2e8337372bf1718383060c24979242e505dcf915b01fb1c.exe
    "C:\Users\Admin\AppData\Local\Temp\a26ad0702fa8eb51a2e8337372bf1718383060c24979242e505dcf915b01fb1c.exe"
    1⤵
    • Checks BIOS information in registry
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Checks processor information in registry
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:1052
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c rd /s /q C:\ProgramData\aRuqKYUHjcVND & timeout 1 & del /f /q "C:\Users\Admin\AppData\Local\Temp\a26ad0702fa8eb51a2e8337372bf1718383060c24979242e505dcf915b01fb1c.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:592
      • C:\Windows\SysWOW64\timeout.exe
        timeout 1
        3⤵
        • Delays execution with timeout.exe
        PID:828

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • memory/1052-61-0x0000000002D40000-0x000000000398A000-memory.dmp

          Filesize

          12.3MB

        • memory/1052-60-0x0000000000400000-0x0000000000AFE000-memory.dmp

          Filesize

          7.0MB

        • memory/1052-59-0x0000000075721000-0x0000000075723000-memory.dmp

          Filesize

          8KB