Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 74d46d86f847d358…

MALICIOUS

Office (OOXML)

18.9 KB Created: 2015-01-15 16:55:01 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-11-21
MD5: a6cb180b785bd0918ab5c95d217763ba SHA-1: 803ea5f3f2c64e3da0b43f3304f700001ce2f133 SHA-256: 74d46d86f847d3588480ab6d37cc7083a1c183745a14cf8f110636fbc88c7331
70 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros, indicated by the 'OOXML_VBA' and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristics. The 'Workbook_Open' auto-execution combined with 'CreateObject' suggests the macros are designed to run automatically and likely download a secondary payload from the provided Dropbox URL. The presence of hidden sheets is a common technique to conceal malicious content.

Heuristics 4

  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://docs.google.com/uc?id=0BxsMXGfPIZfSVzUyaHFYVkQxeFk&export=download� In document text (OOXML body / shared strings)
    • https://www.dropbox.com/s/zhp1b06imehwylq/Synaptics.rar?dl=1�In document text (OOXML body / shared strings)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 27136 bytes
SHA-256: 0b0f89f96efe7e542f277652bf9369111f737e657798ff8579f98bb2cddb1439

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