Office (OOXML) / .XLSM malware analysis — malicious · 3383043324b755aa

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 83edd795222d06de2d12b38948d576d0 SHA-1: 4534664db6bb1ed36deb3c984fdd5fd0dc0f5523 SHA-256: 3383043324b755aaec94475fcfe467e9f13ff5b5df14ec88f18c6a0cc0796bbd

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 macro, which is a common technique for initial execution. The presence of dangerous XLM formula APIs like FORMULA, GOTO, and HALT indicates the macro is designed to call Win32 functions, likely for downloading and executing a payload. The ClamAV detection as 'Xls.Downloader.IcedID' further supports its malicious nature as a downloader.

Heuristics 6

Excel 4.0 macro sheet (15 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, 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.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 15 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 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `c8d3cc732c81101776f8b88264884954905ef8697dcd7d362e06e326dbd84474`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	1415 bytes
`xlm_sheet_01.xml` `27aac2c3e61fd33179f55853dd21cd346c11cfae424bb73b0d9516295cf385a3`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1616 bytes
`xlm_sheet_02.xml` `f4d8ff0a5187f8589c35fb237bec84206266a6c52653bf8253b044239518475e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	2128 bytes
`xlm_sheet_03.xml` `6eb712fcfc4c156c9bc80649785135e8b5a94b00b0e4fb985c7b4ffd74392be5`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	3705 bytes
`xlm_sheet_04.xml` `dad7d088b62ccbf83dda94ae17d917c3926a6ad4999418b63415984492659627`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	1415 bytes
`xlm_sheet_05.xml` `9fdae223af787153e5974406306f7d45b8ca0731b44c896ede5a3869a6224a58`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	2408 bytes
`xlm_sheet_06.xml` `b86ecd75b459c65f21aad3bab569290871c38c2307a1de569f22397bef8d8ace`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml	1741 bytes
`xlm_sheet_07.xml` `8d78432d7c048f346b8510e555249654586ac9841fbc019a50ea4a8bf3bb842d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1739 bytes
`xlm_sheet_08.xml` `1b129ec90222ec026725a775ac10f0dce2a0c1e7b427c67ba92d75825446a762`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1587 bytes
`xlm_sheet_09.xml` `e3663a60506a89ace82046413a4dccde93b6a67b636922c0655790de58364eed`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1795 bytes
`xlm_sheet_10.xml` `7108303c9ef989f666ac7b9ead7cc23ff0b639ea8ef82a9e5add6cc8abf0e4d7`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet10.xml	1879 bytes
`xlm_sheet_11.xml` `e23a4acaf14bd2e6ff5629f08165e8497fdb343d7516d9609ab2169fac110d11`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet11.xml	1926 bytes
`xlm_sheet_12.xml` `42ccc3ae1ec8c2200c80dfc6dc47b8d7cd36433f48171f4c31e7617c89c6b88e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet12.xml	1985 bytes
`xlm_sheet_13.xml` `d414e9d1be7fb6b34a0829a4c81b1a53892e611eefc106b96210ec1060d488c6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet13.xml	1981 bytes
`xlm_sheet_14.xml` `ca65bde9b345eb2bcd7c2930fc6b30e6940779986333116f307d55aebe7fed35`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1442 bytes

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