Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 53da615c1019b82c…

MALICIOUS

Office (OOXML) / .XLSM

497.9 KB Created: 2025-11-27 07:30:49 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2025-12-04
MD5: a3f73e1b9ef746b59643603fb711e93a SHA-1: 7bfa935adcd5a0c4f55c71c7945081bd2cdda151 SHA-256: 53da615c1019b82ccab22d69dac0cd531729f9b0e2720922a0bac832098a161a
298 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The sample is an XLSM file containing obfuscated VBA code designed to execute upon opening the workbook. The Workbook_Open macro uses CreateObject and CallByName to manipulate the Excel interface, likely to conceal malicious activity or present a lure. The presence of obfuscated auto-exec loaders and the manipulation of Excel objects strongly suggest a downloader or droppper functionality, aiming to fetch and execute further stages. The embedded URLs, while some are marked unknown, are suspicious given the context of the macro execution.

Heuristics 10

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Hidden worksheet (veryHidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 4 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 http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/graphall_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/montior.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/listofvalues.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/download_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/graphselection_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/settings_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/uploadall_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/switchresponsibility.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/resetfilters_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/upload.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/graphvariation_enabled.png
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML/
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/shub.jpg
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML//
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML/0.59
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML/BneDownloadService
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML/BneUploaderService���
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML/BneApplicationServiceD
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML/BneComponentService��@
    • http://svdt5pca1dev03.safaricom.net:8014/OA_MEDIA/shub.jpg�
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML//BneUploaderService?bne:tickleSession=True:80��������
    • http://svdt5pca1dev03.safaricom.net:8014/OA_HTML//�
    • http://www.oracle.com/bne
    • http://schemas.microsoft.com/office/2006/01/customui
    • http://schemas.openxmlformats.org/package/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/image
    • http://schemas.microsoft.com/office/2006/relationships/ui/extensibility
    • http://schemas.openxmlformats.org/package/2006/content-types

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
64fffa732f12baab4d005591a54b93b11f446df063d54d5c6f7c8083b291544d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 399443 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
vbaProject_00.bin
23de82177d643ed5fa36bb6e3e9f97bb5794bf6368307e8ee48d58800ccecc3b		 vba-project OOXML VBA project: xl/vbaProject.bin 1159168 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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