Analysis

  • max time kernel
    160s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    12/02/2022, 10:48

General

  • Target

    1ecf062e57ac7a546ca661761a16553a3f730b9c8477c92c317614909b1750c1.exe

  • Size

    303KB

  • MD5

    e16669e45db7f6e0300b6cbbd042f033

  • SHA1

    bfcc111f6117fd5d232a3337870ddd3b5344b8fd

  • SHA256

    1ecf062e57ac7a546ca661761a16553a3f730b9c8477c92c317614909b1750c1

  • SHA512

    7057857d5acf5d25abbc0f0e8bb0406ca10ee4d6b0402f44c4202122dea9042b57e12628551111f3fb7c5528bbcac629307d53809dcc97d347182e3f20c4a325

Malware Config

Extracted

Family

cryptbot

C2

sezylf12.top

morasx01.top

Attributes
  • payload_url

    http://ekuhik11.top/download.php?file=maseru.exe

Signatures

  • CryptBot

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

  • Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Checks processor information in registry 2 TTPs 5 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Enumerates system info in registry 2 TTPs 2 IoCs
  • Modifies data under HKEY_USERS 49 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1ecf062e57ac7a546ca661761a16553a3f730b9c8477c92c317614909b1750c1.exe
    "C:\Users\Admin\AppData\Local\Temp\1ecf062e57ac7a546ca661761a16553a3f730b9c8477c92c317614909b1750c1.exe"
    1⤵
    • Checks computer location settings
    • Checks processor information in registry
    • Suspicious use of WriteProcessMemory
    PID:3580
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\FQCdOZQaaoYN & timeout 4 & del /f /q "C:\Users\Admin\AppData\Local\Temp\1ecf062e57ac7a546ca661761a16553a3f730b9c8477c92c317614909b1750c1.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:508
      • C:\Windows\SysWOW64\timeout.exe
        timeout 4
        3⤵
        • Delays execution with timeout.exe
        PID:3476
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 1144
      2⤵
      • Program crash
      • Checks processor information in registry
      • Enumerates system info in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3820
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3580 -ip 3580
    1⤵
    • Suspicious use of NtCreateProcessExOtherParentProcess
    • Suspicious use of WriteProcessMemory
    PID:1320
  • C:\Windows\System32\svchost.exe
    C:\Windows\System32\svchost.exe -k NetworkService -p
    1⤵
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    PID:632
  • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
    C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
    1⤵
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:408

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • memory/3580-130-0x0000000000C80000-0x0000000000CA5000-memory.dmp

          Filesize

          148KB

        • memory/3580-131-0x0000000000CB0000-0x0000000000CF5000-memory.dmp

          Filesize

          276KB

        • memory/3580-132-0x0000000000400000-0x0000000000448000-memory.dmp

          Filesize

          288KB