Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 309cafa64f27f9e4…

MALICIOUS

Office (OOXML)

2.40 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: b1c829a5ec3c0aed5ca656195ac9d71d SHA-1: e78799f33d74c5bd90c7ade5b346c4e05a59bfc9 SHA-256: 309cafa64f27f9e41e302af15390e888439ab1a2a2969f525a2556544deb63c8
170 Risk Score

Malware Insights

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

The file is an Excel document containing a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening. The macro attempts to manipulate sheets and prompts the user with a message box, suggesting a social engineering or phishing lure. While no direct payload execution URL was found, the presence of VBA macros and the Workbook_Open event strongly indicates malicious intent, likely as a spearphishing attachment.

Heuristics 7

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: /Users/santhoshkumar.p09/AppData/Local/Microsoft/Windows/INetCache/Content.Outlook/FJ06212M/GSTR_4_Offline_Utility_Amend
  • 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://github.com/VBA-tools/VBA-JSON
    • http://www.vbaccelerator.com/home/VB/Code/Techniques/RunTime_Debug_Tracing/VB6_Tracer_Utility_zip_cStringBuilder_cls.asp
    • https://github.com/VBA-tools/VBA-JSON/pull/82
    • https://github.com/VBA-tools/VBA-UtcConverter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://www.opensource.org/licenses/mit-license.php
    • http://code.google.com/p/vba-json/
    • http://msdn.microsoft.com/en-us/library/windows/desktop/ms724421.aspx
    • http://msdn.microsoft.com/en-us/library/windows/desktop/ms724949.aspx
    • http://msdn.microsoft.com/en-us/library/windows/desktop/ms725485.aspx
    • http://support.microsoft.com/kb/269370
    • http://www.ietf.org/rfc/rfc4627.txt
    • https://support.microsoft.com/en-us/kb/272138
    • http://www.opensource.org/licenses/mit-license.php)�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
dec3aad9020373d6f37d93632080996a30db181ec108c71ea4c4a9cf46376a5d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 406605 bytes
vbaProject_00.bin
ec3b1875c6a8595a3324ed06cdfc0965ac0f026401891213a3ba8e4d0bb278f7		 vba-project OOXML VBA project: xl/vbaProject.bin 860160 bytes

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