IcedID Office (OOXML) malware analysis — malicious · e132ce5d82dc128f

MALICIOUS

Office (OOXML)

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

MD5: e6f96908c55e116b350428af9c43a995 SHA-1: 8ea88660c8c3508b0b102149553e733e11f995d7 SHA-256: e132ce5d82dc128fede1366d0c162cab401b0d44997f06367611f17a89ac42b4

250 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains multiple Excel 4.0 macro sheets, including one with an Auto_Open defined name, which is a common technique for initial execution. Critical heuristics indicate the use of dangerous XLM formula APIs like FORMULA and GOTO, which are used to call Win32 functions for downloading and executing payloads. ClamAV detection confirms this as an IcedID downloader. The presence of these elements strongly suggests the file's purpose is to download and execute a second-stage payload.

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, 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 14 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` `83dba5bfbe15006ac89e8f80dd7cef1659412a3734905e1c32eb8daf6ea654c1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	1380 bytes
`xlm_sheet_01.xml` `c82a3f1a5a07e2c3dfdeeb07a65d6c60c5bde7fafc322a698567c77157ce96d2`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1616 bytes
`xlm_sheet_02.xml` `d426f8d1ffb9f4cae0b3596b59264854211f5a37409aff811f2b6e3d0b4471fc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1743 bytes
`xlm_sheet_03.xml` `722e5d05ff76efbc613cfc8faf6010a45d36bce5b42c805efd4dad491ab57285`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1585 bytes
`xlm_sheet_04.xml` `bbabdb72f964374a773f09d55c2ef66fa57494857b47c84f6883880468c3e05f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml	1795 bytes
`xlm_sheet_05.xml` `ee656362086a167f40427380169b904c4e8f6d7223dba3711b5f2ca8ecae3067`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml	1879 bytes
`xlm_sheet_06.xml` `2166c7457651893fa9459576c7b181df82d76c4fcebd021c0c20c24dedc93e62`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet10.xml	1920 bytes
`xlm_sheet_07.xml` `d336d714c064b1de9e9a56ccd73ade8b1f0edff76c17a7e66d685ef714ea6d20`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet11.xml	1929 bytes
`xlm_sheet_08.xml` `aac2ffcbbae09ab4b5869d56560bc65d237d62e10fc10d91608ce8e2b370ca9d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet12.xml	2195 bytes
`xlm_sheet_09.xml` `f132f4041e583271c3d5f2834d2cb24dbe90419bc9d67396179c90ec86cd5770`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1442 bytes

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