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

Static analysis result for SHA-256 a4e2cc092e0f56ef…

MALICIOUS

Office (OOXML) / .XLSM

509.4 KB Created: 2025-05-07 16:29:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2026-01-07
MD5: fd5cb6d7ba8e35ae23c5e2aa6627cdcf SHA-1: e9ba822210e9a9166dc8b7cffa876922ee1772fa SHA-256: a4e2cc092e0f56ef6440e899c6ee2a9f6580b3e29378b5d8f7418ccfd42bec6e
298 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This macro-enabled Excel document (XLSM) contains an obfuscated auto-executing VBA loader within its Workbook_Open macro. The script utilizes CreateObject and CallByName to execute potentially malicious code, and the document body suggests a lure related to data visualization and reporting, possibly to trick users into enabling macros. The presence of multiple benign and unknown URLs, along with embedded images, indicates a sophisticated delivery mechanism. The script's primary function appears to be the execution of a second-stage payload.

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 3 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://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/graphall_enabled.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/montior.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/listofvalues.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/filter.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/download_enabled.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/graphselection_enabled.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/settings_enabled.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/uploadall_enabled.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/switchresponsibility.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/resetfilters_enabled.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/upload.png
    • https://ebsprov.chihuahua.gob.mx:443/OA_MEDIA/graphvariation_enabled.png
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML/
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML//
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML/BneApplicationService
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML/BneComponentService
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML/BneUploaderService
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML/BneDownloadService
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML//BneUploaderService?bne:tickleSession=True
    • http://ebs.chihuahua.gob.mx:8000/OA_HTML//�
    • 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
    • http://www.oracle.com/bne

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3f5077fb57c4ab4bd47f26c0ea1ebdf9761ee5a3fad15025c1c29f8170ce1fb3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 393423 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
vbaProject_00.bin
965fdb9b25c5ecde8953d7d79efc027b44ffc7193c1696c97dfb74e0143282ea		 vba-project OOXML VBA project: xl/vbaProject.bin 1479168 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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