Office (OOXML) / .XLSM malware analysis — malicious · 364c346e9b99b9c8

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 3ef9791392b20e99fb6413691efea44a SHA-1: 92240250cfd68a6c40a7673b6d4bc84340708c43 SHA-256: 364c346e9b99b9c846acb8ce8d2ef0c9fbb2edfc8ffaf0a895d465d783ecdeaa

250 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

This XLSM file contains multiple Excel 4.0 macro sheets, including an Auto_Open defined name, which is a common technique for executing malicious code upon opening. The macros utilize dangerous formula APIs like FORMULA, GOTO, REGISTER, and HALT, which can be used to download and execute arbitrary code. ClamAV also identified this file as a downloader. No document body text was available for analysis, and no URLs were extracted that were not confirmed benign.

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

Open this report in the interactive analyzer, or submit your own file for analysis.