Office (OOXML) / .XLSM malware analysis — malicious · 93b38512e24257ce

MALICIOUS

Office (OOXML) / .XLSM

183.2 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: df870324b37ff22fa38a34d3dd684974 SHA-1: 968a0a996c5f6d94d7cd79f6aca35b1b0b13bb5b SHA-256: 93b38512e24257ceca65a308791022f7542878f7617b85bdef94a3108f6627e6

250 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Command and Scripting T1566.001 Phishing T1071.002 Automated Exploitation T1071.003 User Execution: Malicious File

The file utilizes Excel 4.0 macros, specifically leveraging the XLM format, which was a common vector for malware delivery during 2020-2022. The presence of 'Dangerous XLM formula APIs' (CALL, EXEC, REGISTER, HALT) strongly indicates the intent to execute arbitrary code directly from the spreadsheet, bypassing VBA security controls. The hidden sheets and the use of the URLs associated with the XLM format further support this assessment. The ClamAV detection confirms the file's malicious nature.

Heuristics 6

Excel 4.0 macro sheet (10 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.
Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME

Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
Dangerous XLM formula APIs: FORMULA, GOTO, REGISTER, HALT 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.
ClamAV: Xls.Downloader.GreenEnable06210-9869360-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.GreenEnable06210-9869360-0
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 10 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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
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
- http://schemas.microsoft.com/office/excel/2006/main
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `a59fc544cb8b2d600fcfc478b6d758f14bb5a970dcbd7bed9b6381d0fa65ddcb`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	3233 bytes
`xlm_sheet_01.xml` `716d1708b78778701c84eaf2d848c4aa6dbc859a82080c58f06a0fbf48f39542`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1785 bytes
`xlm_sheet_02.xml` `ee53724c013f6d80cfb10a8b258801e38cf83ba9a7366385139d3838a400abd3`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	2308 bytes
`xlm_sheet_03.xml` `cd3ab4b8e7330421af8fef3b07d1c240d54bea1ef413297f8b55501b9a0e2772`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	1587 bytes
`xlm_sheet_04.xml` `6b118fd093ce5f52799b56aa29ca562e201fc37655267d384c84fbe05ec198aa`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	1587 bytes
`xlm_sheet_05.xml` `d86382cd48cf5b090eb645f7251494f82b2e8c61e4e94a94ba295a5a9a8c628b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1580 bytes
`xlm_sheet_06.xml` `564a12d089bea2438d54307bbe41077c7c199180e2f4d57332081b6e2b2c2cb6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml	1586 bytes
`xlm_sheet_07.xml` `66150b001e8a7524a17d0bdcfa2d5a5d387a75b9c9ca16a1d1bba19ccb52a96e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1583 bytes
`xlm_sheet_08.xml` `32deba180b1d50bf8dc140f42042696af27da0b8d8f58ce045bea4a1bef5015c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1561 bytes
`xlm_sheet_09.xml` `867a6ad5ec743bf32bd430da32ba770bbe97c8032cc70b36d5f7b25b690caefe`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1498 bytes

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