IcedID Office (OOXML) / .XLSM malware analysis — malicious · 04398f4485e899ed

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 52e0590f1e46fcbdd452a5bc87932841 SHA-1: cd31e659ee5163efe2d2dc46dd224c28d8ed0a21 SHA-256: 04398f4485e899edb59413af1fb8befe33b8d7666a1ff6088ae67658b7e5a1ed

250 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

This Excel file contains multiple Excel 4.0 macro sheets, which are known to be used for malicious purposes. The macros utilize dangerous functions like FORMULA and REGISTER to download and execute a second-stage payload. Specifically, the macro attempts to execute 'regsvr32 -s .Broy.getio54', 'regsvr32 -s .Broy.getio541', and 'regsvr32 -s .Broy.getio542', indicating a downloader functionality. ClamAV also identified the sample as IcedID, a known 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 — 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.microsoft.com/office/excel/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/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` `a30cea7059675dc2dfc27c04f638e7a6b89f031862162fefbdc8ecd699667c16`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	3517 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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