Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f0a906263537453e…

MALICIOUS

Office (OOXML)

166.4 KB Created: 2017-06-23 05:03:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-04
MD5: e72d06097d8f628abc0bdf8c6e8b0afb SHA-1: 427b8fef612dbee43909c1aa7195cbe4e89ef9bc SHA-256: f0a906263537453e7860bb5fc0663eadd7e1f83f51b1290c473b069dc198d42c
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This OOXML document contains a VBA project with a Document_Open macro that is configured to execute code. The macro uses Windows API calls to allocate memory and write process data, indicating it's designed to download and execute a second-stage payload. The presence of the 'Doc.Malware.Valyria-10023899-0' ClamAV signature further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-10023899-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10023899-0
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Public Sub Document_Open()
    RunNotepadViaCreateProcess
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5836 bytes
SHA-256: d0a07cce77c43cc65c268af9174a1204a9fe0a55e710dfd6262b9c885d546d1a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Const PROCESS_ALL_ACCESS = &H1F0FFF
Private Const MEM_COMMIT = &H1000
Private Const MEM_RELEASE = &H8000
Private Const PAGE_READWRITE = &H40
Private Const HKEY_LOCAL_MACHINE = &H80000002
Private Const PROCESSOR_ARCHITECTURE_AMD64 = 9

Private Type PROCESS_INFORMATION
    hProcess As Long
    hThread As Long
    dwProcessId As Long
    dwThreadId As Long
End Type

Private Type STARTUPINFO
    cb As Long
    lpReserved As String
    lpDesktop As String
    lpTitle As String
    dwX As Long
    dwY As Long
    dwXSize As Long
    dwYSize As Long
    dwXCountChars As Long
    dwYCountChars As Long
    dwFillAttribute As Long
    dwFlags As Long
    wShowWindow As Integer
    cbReserved2 As Integer
    lpReserved2 As Long
    hStdInput As Long
    hStdOutput As Long
    hStdError As Long
End Type

#If VBA7 Then 'x64 office
    Private Declare PtrSafe Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, ByVal uExitCode As Long) As Boolean
    Private Declare PtrSafe Function VirtualAllocEx Lib "kernel32" (ByVal hProcess As Long, ByVal lpAddress As Long, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As LongPtr
    Private Declare PtrSafe Function VirtualFreeEx Lib "kernel32" (ByVal hProcess As Long, ByVal lpAddress As Long, ByVal dwSize As Long, ByVal dwFreeType As Long) As LongPtr
    Private Declare PtrSafe Function WriteProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As LongPtr, ByRef lpBuffer As Any, ByVal nSize As Long, ByVal lpNumberOfBytesWritten As LongPtr) As LongPtr
    Private Declare PtrSafe Function CreateRemoteThread Lib "kernel32" (ByVal hProcess As Long, ByVal lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As LongPtr, lpParameter As Any, ByVal dwCreationFlags As Long, lpThreadId As Long) As LongPtr
    Private Declare PtrSafe Sub GetSystemInfo Lib "kernel32" (lpSystemInfo As SYSTEM_INFO)
    Private Declare PtrSafe Function GetCurrentProcess Lib "kernel32" () As LongPtr
    Private Declare PtrSafe Function IsWow64Process Lib "kernel32" (ByVal hProcess As LongPtr, ByRef Wow64Process As Boolean) As Boolean
    Private Declare PtrSafe Function CreateProcessA Lib "kernel32" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As Any, ByVal lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDirectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
    Private Type SYSTEM_INFO
        wProcessorArchitecture As Integer
        wReserved As Integer
        dwPageSize As Long
        lpMinimumApplicationAddress As LongPtr
        lpMaximumApplicationAddress As LongPtr
        dwActiveProcessorMask As LongPtr
        dwNumberOrfProcessors As Long
        dwProcessorType As Long
        dwAllocationGranularity As Long
        wProcessorLevel As Integer
        wProcessorRevision As Integer
    End Type
#Else
    Private Declare Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, ByVal uExitCode As Long) As Boolean
    Private Declare Function VirtualAllocEx Lib "kernel32" (ByVal hProcess As Long, ByVal lpAddress As Any, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long
    Private Declare Function VirtualFreeEx Lib "kernel32" (ByVal hProcess As Long, ByVal lpAddress As Any, ByVal dwSize As Long, ByVal dwFreeType As Long) As Long
    Private Declare Function WriteProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, ByRef lpBuffer As Any, ByVal nSize As Long, ByVal lpNumberOfBytesWritten As Long) As Long
    Private Declare Function CreateRemoteThread Lib "kernel32" (ByVal hProcess As Long, ByVal lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, lpParameter As Any, ByVal dwCreationFlags As Long, lpThreadId As Long) As Long
    Private Declare Sub GetSystemInfo Lib "kernel32" (lpSystemInfo As SYSTEM_INFO)
    Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
    Private Declare Function IsWow64Process Lib "kernel32" (ByVal hProcess As Long, ByRef Wow64Process As Boolean) As Boolean
    Private Declare Function CreateProcessA Lib "kernel32" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
    Private Type SYSTEM_INFO
        wProcessorArchitecture As Integer
        wReserved As Integer
        dwPageSize As Long
        lpMinimumApplicationAddress As Long
        lpMaximumApplicationAddress As Long
        dwActiveProcessorMask As Long
        dwNumberOrfProcessors As Long
        dwProcessorType As Long
        dwAllocationGranularity As Long
        dwReserved As Long
    End Type
#End If

Sub RunNotepadViaCreateProcess()
    Dim pInfo As PROCESS_INFORMATION
    Dim sInfo As STARTUPINFO
    Dim sNull As String
    Dim sProc As String
    sInfo.dwFlags = 1

    res = CreateProcessA(sNull, "c:\\windows\\system3\\notepad.exe", ByVal 0&, ByVal 0&, ByVal 1&, ByVal 4&, ByVal 0&, sNull, sInfo, pInfo)
End Sub
                            
Public Sub Document_Open()
    RunNotepadViaCreateProcess
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 26112 bytes
SHA-256: bf3abb504081acf0fc84cefa11ef59f86c61f1e55a7b11a1f0fdb506680e991d
Detection
ClamAV: Doc.Malware.Valyria-10023899-0
Obfuscation or payload: unlikely

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