Analysis

  • max time kernel
    115s
  • max time network
    113s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    20-01-2021 16:25

General

  • Target

    effp.exe

  • Size

    15KB

  • MD5

    1983ead6d04607d63ca056ec796fb87f

  • SHA1

    a437a10a281b78b7e7d87049a7864ed9fb2dc765

  • SHA256

    74e35db0e018a83a1002237e7521e2cc0f2d03c6befa319d2b55c68f248f5bbd

  • SHA512

    f4c195487428ed46830bf5047c87614d575adb871e8e8e32bb9eb9806be07b8076a78903288b5d7323e5930f5a4b7ef914bd25b0c5d7dc59dad7c445441e6c8b

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.privateemail.com
  • Port:
    587
  • Username:
    nancy.chen@exxacitcorp.com
  • Password:
    LifeDram2021

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Turns off Windows Defender SpyNet reporting 2 TTPs
  • Windows security bypass 2 TTPs
  • AgentTesla Payload 5 IoCs
  • Looks for VirtualBox Guest Additions in registry 2 TTPs
  • Looks for VMWare Tools registry key 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Drops startup file 2 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Windows security modification 2 TTPs 11 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Maps connected drives based on registry 3 TTPs 2 IoCs

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

  • Suspicious use of NtSetInformationThreadHideFromDebugger 15 IoCs
  • Suspicious use of SetThreadContext 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 18 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 45 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\effp.exe
    "C:\Users\Admin\AppData\Local\Temp\effp.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks BIOS information in registry
    • Drops startup file
    • Windows security modification
    • Adds Run key to start application
    • Maps connected drives based on registry
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:60
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\effp.exe" -Force
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2612
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\effp.exe" -Force
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:196
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\effp.exe" -Force
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:944
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\effp.exe" -Force
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3824
    • C:\Users\Admin\AppData\Local\Temp\effp.exe
      "C:\Users\Admin\AppData\Local\Temp\effp.exe"
      2⤵
        PID:3808
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3808 -s 96
          3⤵
          • Program crash
          PID:2812
      • C:\Users\Admin\AppData\Local\Temp\effp.exe
        "C:\Users\Admin\AppData\Local\Temp\effp.exe"
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2308
      • C:\Users\Admin\AppData\Local\Temp\effp.exe
        "C:\Users\Admin\AppData\Local\Temp\effp.exe"
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2984
      • C:\Users\Admin\AppData\Local\Temp\effp.exe
        "C:\Users\Admin\AppData\Local\Temp\effp.exe"
        2⤵
          PID:2192
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2192 -s 88
            3⤵
            • Program crash
            PID:4012
        • C:\Users\Admin\AppData\Local\Temp\effp.exe
          "C:\Users\Admin\AppData\Local\Temp\effp.exe"
          2⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:2172

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Persistence

      Winlogon Helper DLL

      1
      T1004

      Registry Run Keys / Startup Folder

      1
      T1060

      Defense Evasion

      Modify Registry

      5
      T1112

      Disabling Security Tools

      3
      T1089

      Virtualization/Sandbox Evasion

      2
      T1497

      Credential Access

      Credentials in Files

      3
      T1081

      Discovery

      Query Registry

      4
      T1012

      Virtualization/Sandbox Evasion

      2
      T1497

      System Information Discovery

      3
      T1082

      Peripheral Device Discovery

      1
      T1120

      Collection

      Data from Local System

      3
      T1005

      Command and Control

      Web Service

      1
      T1102

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
        MD5

        db01a2c1c7e70b2b038edf8ad5ad9826

        SHA1

        540217c647a73bad8d8a79e3a0f3998b5abd199b

        SHA256

        413da361d77055dae7007f82b58b366c8783aa72e0b8fbe41519b940c253b38d

        SHA512

        c76ff57fcee5cdf9fdf3116d4e1dc0cf106867bf19ab474b763e242acf5dca9a7509cb837c35e130c3e056636b4e8a4e135512a978bcd3dd641e20f5bf76c3d6

      • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        MD5

        2a507e0b06ef3f3c594c5b35985c501a

        SHA1

        c4955eaf5cab92ca4d5c5e7c27d154bee0723799

        SHA256

        48b3c8bd45ca1f45ea473368e70c420cda970a97104a0c4babaa5a94abc86d73

        SHA512

        fafd29829167214e3aa287e514675a182ebe9922069443ff2723aa9c3c20b6bdae110e0b3efdfa273c265ce266f52e6b1e5f2765b4199d7635a082ae9ba13df8

      • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        MD5

        2a507e0b06ef3f3c594c5b35985c501a

        SHA1

        c4955eaf5cab92ca4d5c5e7c27d154bee0723799

        SHA256

        48b3c8bd45ca1f45ea473368e70c420cda970a97104a0c4babaa5a94abc86d73

        SHA512

        fafd29829167214e3aa287e514675a182ebe9922069443ff2723aa9c3c20b6bdae110e0b3efdfa273c265ce266f52e6b1e5f2765b4199d7635a082ae9ba13df8

      • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        MD5

        6e17301d627e1a5903708bfc213b1872

        SHA1

        daad18b90153d014ae7a8fd0d5af3ae190150382

        SHA256

        17ac897e40911110772a75533e646739fd7f6a6e261fd33d6e363a7c16c593e0

        SHA512

        05110b09d27268acbdb98721eb5f9acba22861622fd161d56f2160ae182054f3851b9c78b04ff98e0c50e4e58a9ca976eff2c25b6ec175ca6b0c6646dd7b8220

      • memory/60-9-0x00000000053F0000-0x00000000053F1000-memory.dmp
        Filesize

        4KB

      • memory/60-5-0x00000000054A0000-0x00000000054A1000-memory.dmp
        Filesize

        4KB

      • memory/60-31-0x00000000067E0000-0x00000000067E1000-memory.dmp
        Filesize

        4KB

      • memory/60-10-0x0000000006190000-0x00000000061FA000-memory.dmp
        Filesize

        424KB

      • memory/60-11-0x0000000006270000-0x0000000006271000-memory.dmp
        Filesize

        4KB

      • memory/60-2-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/60-8-0x0000000005060000-0x0000000005061000-memory.dmp
        Filesize

        4KB

      • memory/60-3-0x0000000000850000-0x0000000000851000-memory.dmp
        Filesize

        4KB

      • memory/60-7-0x00000000051C0000-0x00000000051C1000-memory.dmp
        Filesize

        4KB

      • memory/60-6-0x0000000005080000-0x0000000005081000-memory.dmp
        Filesize

        4KB

      • memory/196-13-0x0000000000000000-mapping.dmp
      • memory/196-19-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/196-119-0x000000007F300000-0x000000007F301000-memory.dmp
        Filesize

        4KB

      • memory/196-87-0x0000000007F10000-0x0000000007F11000-memory.dmp
        Filesize

        4KB

      • memory/196-24-0x0000000006880000-0x0000000006881000-memory.dmp
        Filesize

        4KB

      • memory/196-157-0x0000000009090000-0x0000000009091000-memory.dmp
        Filesize

        4KB

      • memory/196-71-0x0000000006E40000-0x0000000006E41000-memory.dmp
        Filesize

        4KB

      • memory/196-142-0x0000000009160000-0x0000000009161000-memory.dmp
        Filesize

        4KB

      • memory/196-79-0x00000000076D0000-0x00000000076D1000-memory.dmp
        Filesize

        4KB

      • memory/196-145-0x0000000006883000-0x0000000006884000-memory.dmp
        Filesize

        4KB

      • memory/196-37-0x0000000006882000-0x0000000006883000-memory.dmp
        Filesize

        4KB

      • memory/944-35-0x00000000076D0000-0x00000000076D1000-memory.dmp
        Filesize

        4KB

      • memory/944-141-0x0000000009E70000-0x0000000009E71000-memory.dmp
        Filesize

        4KB

      • memory/944-14-0x0000000000000000-mapping.dmp
      • memory/944-133-0x000000007F810000-0x000000007F811000-memory.dmp
        Filesize

        4KB

      • memory/944-18-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/944-132-0x0000000008D60000-0x0000000008D61000-memory.dmp
        Filesize

        4KB

      • memory/944-26-0x0000000007D10000-0x0000000007D11000-memory.dmp
        Filesize

        4KB

      • memory/944-25-0x00000000076D2000-0x00000000076D3000-memory.dmp
        Filesize

        4KB

      • memory/944-147-0x00000000076D3000-0x00000000076D4000-memory.dmp
        Filesize

        4KB

      • memory/2172-54-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/2172-51-0x00000000004374CE-mapping.dmp
      • memory/2172-64-0x0000000004EB0000-0x0000000004EB1000-memory.dmp
        Filesize

        4KB

      • memory/2172-91-0x0000000004EE0000-0x0000000004EE1000-memory.dmp
        Filesize

        4KB

      • memory/2172-171-0x0000000004EB1000-0x0000000004EB2000-memory.dmp
        Filesize

        4KB

      • memory/2192-46-0x00000000004374CE-mapping.dmp
      • memory/2308-36-0x0000000000400000-0x000000000043C000-memory.dmp
        Filesize

        240KB

      • memory/2308-38-0x00000000004374CE-mapping.dmp
      • memory/2308-63-0x0000000004990000-0x0000000004991000-memory.dmp
        Filesize

        4KB

      • memory/2308-42-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/2612-128-0x000000007E800000-0x000000007E801000-memory.dmp
        Filesize

        4KB

      • memory/2612-149-0x0000000009E50000-0x0000000009E51000-memory.dmp
        Filesize

        4KB

      • memory/2612-12-0x0000000000000000-mapping.dmp
      • memory/2612-39-0x0000000005062000-0x0000000005063000-memory.dmp
        Filesize

        4KB

      • memory/2612-93-0x0000000008B60000-0x0000000008B61000-memory.dmp
        Filesize

        4KB

      • memory/2612-16-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/2612-84-0x0000000008200000-0x0000000008201000-memory.dmp
        Filesize

        4KB

      • memory/2612-33-0x0000000005060000-0x0000000005061000-memory.dmp
        Filesize

        4KB

      • memory/2612-146-0x0000000005063000-0x0000000005064000-memory.dmp
        Filesize

        4KB

      • memory/2812-65-0x00000000047D0000-0x00000000047D1000-memory.dmp
        Filesize

        4KB

      • memory/2984-45-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/2984-62-0x0000000005450000-0x0000000005451000-memory.dmp
        Filesize

        4KB

      • memory/2984-43-0x00000000004374CE-mapping.dmp
      • memory/3808-34-0x00000000004374CE-mapping.dmp
      • memory/3824-30-0x0000000004580000-0x0000000004581000-memory.dmp
        Filesize

        4KB

      • memory/3824-137-0x0000000009090000-0x0000000009091000-memory.dmp
        Filesize

        4KB

      • memory/3824-40-0x0000000004582000-0x0000000004583000-memory.dmp
        Filesize

        4KB

      • memory/3824-148-0x0000000004583000-0x0000000004584000-memory.dmp
        Filesize

        4KB

      • memory/3824-123-0x000000007ECE0000-0x000000007ECE1000-memory.dmp
        Filesize

        4KB

      • memory/3824-20-0x0000000004430000-0x0000000004431000-memory.dmp
        Filesize

        4KB

      • memory/3824-17-0x0000000073AD0000-0x00000000741BE000-memory.dmp
        Filesize

        6.9MB

      • memory/3824-101-0x0000000008F60000-0x0000000008F93000-memory.dmp
        Filesize

        204KB

      • memory/3824-15-0x0000000000000000-mapping.dmp
      • memory/3824-67-0x0000000006AC0000-0x0000000006AC1000-memory.dmp
        Filesize

        4KB

      • memory/4012-66-0x00000000042C0000-0x00000000042C1000-memory.dmp
        Filesize

        4KB