IcedID Office (OOXML) / .XLSM malware analysis — malicious · 62acd918b5c43b21

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: cade949226c64ac7341cdc0f1301ea24 SHA-1: c7815cd90e684d7af575ca4e7d0c0055df81e9a7 SHA-256: 62acd918b5c43b21d895890e6632bcb742a2a99cd3a8d218d10ee660e1e46d6c

250 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an XLSM document containing multiple Excel 4.0 macro sheets. These macros utilize dangerous functions like FORMULA, REGISTER, and HALT to download and execute files. Specifically, the macros construct commands to download payloads named 'Hikos.hertolo', 'Hikos.hertolo1', and 'Hikos.hertolo2' and then execute them using 'regsvr32 -s'. This behavior is characteristic of a downloader, and ClamAV detection confirms it as IcedID.

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.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 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 — 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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `96fef4185c719a422db4ff5116ec06951e8474b003a4456b635c16ca4c8aed1f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	3864 bytes
`xlm_sheet_01.xml` `05429996701eacd52396b49a7b542ebf5f54ec159e49392a0fde30360c280f6c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	2017 bytes
`xlm_sheet_02.xml` `c93414afa90d0aed96b0ce72668e15428c1af49ef990d4433b19efa6b27dd697`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	2703 bytes
`xlm_sheet_03.xml` `caf907d21dc38a6bc75aedd846db9e62599779d4c2dbd3f24898f275d22c250a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	1521 bytes
`xlm_sheet_04.xml` `7667966c8045cbbf1d7c1f279245a5e7c4ac004e5ebe30fbd872010d3792710f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	1791 bytes
`xlm_sheet_05.xml` `c2e30072b0b55de845ae0cc0cf580b57d25538df7bd72d890703ffb59bd466f3`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1667 bytes
`xlm_sheet_06.xml` `4a0db02a3673bae10855faec06cd35685ff751631b0072a271b38d935beecf95`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml	1735 bytes
`xlm_sheet_07.xml` `a0c80460b9f4e41cc5c80274d1c193d030f8b4e954b0aa51ef669e0af14e35d8`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1679 bytes
`xlm_sheet_08.xml` `1c52474b1448a0ffd9d21d1a06b05ada2668f4c15ffc52265026119f5dff69ca`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1611 bytes
`xlm_sheet_09.xml` `1a7af89e4cf7b3f73e9df27b77fe950621de8a90c0032239be05b21b75e5f301`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1801 bytes

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