Office (OOXML) / .XLSX malware analysis — malicious · ce6dd324f415bd11

MALICIOUS

Office (OOXML) / .XLSX

1.22 MB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-25

MD5: e60173df2fcd0a2415e7f5674bcb25b3 SHA-1: 6fbc05cf0b9558669092f5606e76837c12031b34 SHA-256: ce6dd324f415bd11425977f02beaf72bde4ac497f5cb36e83a57018fd9ad00f4

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1566.001 Spearphishing Attachment

The sample is an Excel file containing embedded OLE objects and multiple Excel 4.0 macro sheets, indicating a complex macro-based execution chain. The critical heuristics confirm the presence of these macro sheets, which are often used to deliver malicious payloads. The specific macro sheet files are listed as IOCs. The exact payload or download mechanism is not fully discernible from the truncated script excerpts, but the overall structure points to a malicious document designed to execute code upon opening.

Heuristics 3

Excel 4.0 macro sheet (12 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSX

OOXML package is named .xlsx but contains XLSB workbook parts and an international Excel 4.0 macro sheet. This hides XLM macro execution from scanners that trust the extension or only inspect XML worksheet parts. The technique is macro execution, not a document-parser CVE.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `11df50ce2d7cd0739878179454b7cc6ed4ad6bfaf9294e70eee974252cbdb84d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject3.bin	2263040 bytes
`ooxml_oleobject_00_ole10native_00.bin` `45f228642570d6f2de779122b0cdd1d811accdd0ae229de173fb524415b59b67`	ole-package	OOXML xl/embeddings/oleObject3.bin Ole10Native stream: Ole10Native	2243012 bytes
`emf_00.emf` `28a2af9cf0dcacb9693939904f250d2c6bc1017fd36bb28b549de84468d7f1ad`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	4486440 bytes
`xlm_sheet_00.bin` `ea7a3102e46d8bf08bd9f01d4841aa105a0724fa8af5617982264aaa01236dae`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet4.bin	674 bytes
`xlm_sheet_01.bin` `4c71568b7630113b597835b102b2328248b90e4eb637c4bdfbc4fb844a77b191`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin	1648 bytes
`xlm_sheet_02.bin` `06668a57a424982e4bd69e93bf5ca30e4dc9435162c70915d3f6f518e340568b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin	393 bytes
`xlm_sheet_03.bin` `322b1d4a8eaadcd33854f7ad86e6bc1e5f3cae34c64f3c494cfdd956ab4b40d4`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3339 bytes
`xlm_sheet_04.bin` `306ecff92cc61db265b490b1bc551b75b773e0ac8dea6ca1e27dbcb4a038090c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin	1322 bytes
`xlm_sheet_05.bin` `4d9fac7c70e5d2dc817f9126afbb5e8786cd6641670148f266f1a4a9af99aafe`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin	692 bytes
`xlm_sheet_06.bin` `02c3c5abae8cf783b78e4a31a1888df4d3bf1fbae4975cf8559fc0ce1f94623e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin	712 bytes
`xlm_sheet_07.bin` `52348828f37c8331fc4451c1d0a2cb2ab44d955939b598370835edf3e6946764`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin	562 bytes
`xlm_sheet_08.bin` `bb9194f1453cdf1d831b913a8ca7fcb5cd79c5bf81f5a0caa2337c6f74086ebc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.bin	794 bytes
`xlm_sheet_09.bin` `b3b4178cbe3fec4b5ab97cd9624c14e4ccdda241a1de56d0ff492be85c425364`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin	393 bytes
`xlm_sheet_10.bin` `d90db14b192053f29760909b4ac8bcf0838b65a53f3a56fe918f2a2cdcfd7fb6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin	442 bytes
`xlm_sheet_11.bin` `f8c568c2bd07f342eda74f2d9756b4236b258df41242e538323e2e0a55f09ab2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.bin	674 bytes

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