Analysis

  • max time kernel
    147s
  • max time network
    147s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    05/02/2021, 14:07

General

  • Target
    book-AUY70-04022021.xls
  • Size 139KB
  • Sample210205-bg2j9k67da
  • SHA256 8162e0799dc6887d63119af7836399684041e981d8e1cc48d0bf852dc785d8ce
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • gozi_rm3

Botnet
  • 201193207

C2
  • https://topitophug.xyz

Attributes
  • build

    300932

  • exe_type

    loader

rsa_pubkey.base64
serpent.plain

Signatures

  • Gozi RM3

    A heavily modified version of Gozi using RM3 loader.

  • Process spawned unexpected child process 1 IoCs

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

  • Blocklisted process makes network request 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Checks processor information in registry 2 TTPs 3 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies Internet Explorer settings 1 TTPs 78 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SetWindowsHookEx 24 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
    "C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\book-AUY70-04022021.xls"
    1⤵
    • Checks processor information in registry
    • Enumerates system info in registry
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:540
    • C:\Windows\SYSTEM32\rundll32.exe
      rundll32 C:\nuewi\neiq.auw,DllRegisterServer
      2⤵
      • Process spawned unexpected child process
      • Suspicious use of WriteProcessMemory
      PID:4028
      • C:\Windows\SysWOW64\rundll32.exe
        rundll32 C:\nuewi\neiq.auw,DllRegisterServer
        3⤵
        • Blocklisted process makes network request
        • Loads dropped DLL
        PID:3936
  • C:\Program Files\Internet Explorer\iexplore.exe
    "C:\Program Files\Internet Explorer\iexplore.exe" -Embedding
    1⤵
    • Modifies Internet Explorer settings
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:500
    • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
      "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:500 CREDAT:82945 /prefetch:2
      2⤵
      • Modifies Internet Explorer settings
      • Suspicious use of SetWindowsHookEx
      PID:2104
  • C:\Program Files\Internet Explorer\iexplore.exe
    "C:\Program Files\Internet Explorer\iexplore.exe" -Embedding
    1⤵
    • Modifies Internet Explorer settings
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1172
    • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
      "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1172 CREDAT:82945 /prefetch:2
      2⤵
      • Modifies Internet Explorer settings
      • Suspicious use of SetWindowsHookEx
      PID:3700
  • C:\Program Files\Internet Explorer\iexplore.exe
    "C:\Program Files\Internet Explorer\iexplore.exe" -Embedding
    1⤵
    • Modifies Internet Explorer settings
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3768
    • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
      "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:3768 CREDAT:82945 /prefetch:2
      2⤵
      • Modifies Internet Explorer settings
      • Suspicious use of SetWindowsHookEx
      PID:1528

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/540-6-0x00007FF9A7230000-0x00007FF9A7867000-memory.dmp

        memory/540-2-0x00007FF983B50000-0x00007FF983B60000-memory.dmp

        memory/540-5-0x00007FF983B50000-0x00007FF983B60000-memory.dmp

        memory/540-4-0x00007FF983B50000-0x00007FF983B60000-memory.dmp

        memory/540-3-0x00007FF983B50000-0x00007FF983B60000-memory.dmp

        memory/3936-12-0x00000000045F0000-0x0000000004602000-memory.dmp

        memory/3936-14-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

        memory/3936-13-0x0000000002E90000-0x0000000002E9E000-memory.dmp

        memory/3936-11-0x0000000000870000-0x0000000000871000-memory.dmp