Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 b1f7bcbc828811ba…

MALICIOUS

Office (OLE) / .XLSX

387.5 KB Created: 2004-08-09 12:27:33 Authoring application: Microsoft Excel First seen: 2022-03-01
MD5: 64608519d52c6070f49c7d5c64dd6c4f SHA-1: 470eca5576eeb7560b6b978dcee4f8c2b7883afa SHA-256: b1f7bcbc828811ba2e1937ada7bad6c63a480c3714b172ef895366eb48c4dbad
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1547.001 Registry Run Keys / Startup Folder T1059.005 Visual Basic

The file contains a Workbook_Open VBA macro that is triggered automatically when the workbook is opened. This macro utilizes CreateObject to execute cmd.exe, indicating an attempt to run arbitrary commands. The presence of a large VBA macro (189647 bytes) and the specific heuristic firings strongly suggest malicious intent, likely to download and execute a second-stage payload. No specific family could be identified.

Heuristics 7

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://sport.sirius.local/workrooms/uwss-dev/_layouts/15/DocIdRedir.aspx?ID=XQSJMHPH4PPY-1549-4
    • http://schemas.microsoft.com/sharepoint/v3/contenttype/forms
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
    • http://schemas.microsoft.com/office/2006/metadata/longProperties
    • http://schemas.microsoft.com/sharepoint/events
    • http://schemas.microsoft.com/office/2006/metadata/contentType
    • http://schemas.microsoft.com/office/2006/metadata/properties/metaAttributes
    • http://schemas.microsoft.com/office/2006/metadata/properties
    • http://www.w3.org/2001/XMLSchema
    • http://schemas.microsoft.com/office/2006/documentManagement/types
    • http://schemas.microsoft.com/office/infopath/2007/PartnerControls
    • http://schemas.openxmlformats.org/package/2006/metadata/core-properties
    • http://www.w3.org/2001/XMLSchema-instance
    • http://purl.org/dc/elements/1.1/
    • http://purl.org/dc/terms/
    • http://schemas.microsoft.com/internal/obd
    • http://dublincore.org/schemas/xmls/qdc/2003/04/02/dc.xsd
    • http://dublincore.org/schemas/xmls/qdc/2003/04/02/dcterms.xsd

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1431c8eba3b445cd4a7e698112edf2f440e75f1ea55e2160e826c591a343bb58		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 189647 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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