IcedID Office (OOXML) / .XLSM malware analysis — malicious · e3bfd9c976e5c082

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 7f6b83f2777b6d1446cb94b7302e4a42 SHA-1: 7354dd4710a35a18bd928f225c260da2b9656c34 SHA-256: e3bfd9c976e5c082bed028397be1cea892e33fcd5cad1fbdea82305f6fce788a

250 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell

This XLSM file contains Excel 4.0 macros, including the use of dangerous functions like FORMULA, GOTO, and HALT, which are often used to download and execute malicious payloads. The ClamAV detection explicitly identifies it as an IcedID downloader. No document body text was available for analysis, but the presence of hidden sheets and the macro structure strongly indicate a downloader's functionality.

Heuristics 6

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.
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 12 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 12

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `86c0f2552a624745457bb637a97127676f1e054c3bb2502498ac232ff269004d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	1681 bytes
`xlm_sheet_01.xml` `561f95d832a1683473e51e0aa00fbed56e304e487c689ed25427d788cac3f41b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1792 bytes
`xlm_sheet_02.xml` `9d7145fc17238193b2b24d4b34eba56af8d578acf660d7f6fbc9884716a1fddb`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	3351 bytes
`xlm_sheet_03.xml` `26de9143f6cf5fe0f788d73021ad73f1b27c24005dbc236118e777f8b0506730`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	1453 bytes
`xlm_sheet_04.xml` `642478462247db462458c25a649e2ef4d4af939fde7671ef0314eb05631b656e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	2316 bytes
`xlm_sheet_05.xml` `834cc4ef6a3c6af06615c8aa6d949afa517651ede1eeec21b53e4f5de11176b2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1701 bytes
`xlm_sheet_06.xml` `e2e22adbcd323409c23460c8491ea932ccfc479e66a0fd43b3cbf016637deee2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml	1769 bytes
`xlm_sheet_07.xml` `9507c9bf64f0fa04c0d91326c17f3b386e15711c5312be27a337514cf0b6963d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1615 bytes
`xlm_sheet_08.xml` `a16b352f19b762bc089f321940370e5aa88de10cc425f46c48ac731ed7304e51`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1707 bytes
`xlm_sheet_09.xml` `3410dc6b12447c4830c016503e43b45ab5cff38e0d670614371cb8b322ad335a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet10.xml	1655 bytes
`xlm_sheet_10.xml` `680c8c40818c9c3a7607267f1be6ac99c5cb1a8387571cb89d7009df7fb84386`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet11.xml	1760 bytes
`xlm_sheet_11.xml` `e1262acede2d280bc5b759e7ce68181c1f89ca447048e2f784ee5363df57d312`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1402 bytes

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