Office (OOXML) / .XLSX malware analysis — malicious · 2350513e431a8a68

MALICIOUS

Office (OOXML) / .XLSX

36.2 KB Created: 2020-04-29 13:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: e2f8a1750229dce869b1a772be21d5b7 SHA-1: 714785d4f265887c8e2681463b9b3095ec2dd580 SHA-256: 2350513e431a8a68345fdfef42abfab31d8aa621a093a35db3da553f89b70b03

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

This XLSX file contains multiple hidden Excel 4.0 macro sheets. The macros utilize dangerous XLM functions such as RUN and CALL, which are commonly used to download and execute arbitrary code. The presence of these functions and hidden sheets strongly suggests a malicious intent to deliver a secondary payload, although no specific URLs or executable artifacts were directly extracted from this sample.

Heuristics 5

Dangerous XLM formula APIs: RUN, CALL, HALT, FORMULA critical OOXML_XLM_DANGEROUS_FN

Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
Excel 4.0 macro sheet (18 sheet(s)) high 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.
Suspicious extracted artifact medium 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.
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 18 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://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 18

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `d286de097658367aefac32ee6fe426b03b50af356f8b56094aaed39be307edbd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	61161 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).
`xlm_sheet_01.xml` `b85724a3524837ebca0e301b3b626d538b43c122ef1c07ca9ca8f27295715312`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	18141 bytes
`xlm_sheet_02.xml` `8e2a6065b66c127409a254e87b221901ad25f6dbc70813671c0589458015af45`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.xml	1086 bytes
`xlm_sheet_03.xml` `dbb584240e374f3004d668b3e4ee89bdb4d5a025ec02d55022df9fc87a6a96ab`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet4.xml	1086 bytes
`xlm_sheet_04.xml` `76bb2418e2375d0e7d0d43d5176694600c66d8e41fef823afa5e69c40384bce4`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet5.xml	1086 bytes
`xlm_sheet_05.xml` `571f0ab1966c22db75946fee3ea2b1dc9a7f6002f2ed91adc9a3a51d542d98cb`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet6.xml	1086 bytes
`xlm_sheet_06.xml` `074f62b35805fe25f55f486d13f20474f6bcc674286439b5df8ece1c46c57915`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet7.xml	1086 bytes
`xlm_sheet_07.xml` `e075be0435afc1d7776b61177ddc986a54cfb254e94768b1a3d7b209a1f8b5be`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet8.xml	1086 bytes
`xlm_sheet_08.xml` `df5e8ffb015f8123bfb9474f510c6f918ba4d975060f159433c1780672caf4f8`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet9.xml	1086 bytes
`xlm_sheet_09.xml` `73139974c2396d1ccd431c04867bbe076ffb0a269cc9e96b11b733c4ee2921cb`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet10.xml	1086 bytes
`xlm_sheet_10.xml` `af2430061e621b3013877556b7aa829451a0281ed4dc45b6f8717453a28881bc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet11.xml	1086 bytes
`xlm_sheet_11.xml` `22ec5996c13634daae844b9f03f9e19fe8e9a7072d2a4e8066c33f7e05c22c12`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet12.xml	1086 bytes
`xlm_sheet_12.xml` `fefff49b9b4078016c86be77f1790a229cec72ae33e775047ac04d4136dd5ddd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet13.xml	1086 bytes
`xlm_sheet_13.xml` `6a723ba1167365772eb8180fe946b59520192b9847b456df43faaa569ba96fb9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet14.xml	1086 bytes
`xlm_sheet_14.xml` `de8b4cc990bca0a69f70079eb764ee7037dd1b6b0032ab4afbd9be5836c0899b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet15.xml	1086 bytes
`xlm_sheet_15.xml` `841bf512f25c85484e69292ba1efa6f7949c3f913b319b83e0d9eebad90d0f60`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet16.xml	1086 bytes
`xlm_sheet_16.xml` `198be55c8ce47958aee2467e40e8242dcf335247c4e074e835b7e0bf12bff9ff`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet17.xml	1086 bytes
`xlm_sheet_17.xml` `1c50397a4ea4c83bd72c77ab3c74153334d010107d00dc4d1dae3bb112be285b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet18.xml	1086 bytes

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