IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 35f32288d76b4f67…

MALICIOUS

Office (OOXML)

186.6 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 71a89599230baf19d6d822b56ed1f21c SHA-1: 2a698bef5a5db1624e0dd61d473ea6cbcfd08c1b SHA-256: 35f32288d76b4f67687796f8c6f6478761b94ddd32d5e2d890a14effcb0476d3
242 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like CALL and EXEC to download a file from 'http://feedbackdownload.today/44389,7571259259.jpg' and then execute it using 'regsvr32 -silent "..\ALBATROS1.dll"'. This behavior is characteristic of the IcedID malware family, which often acts as a downloader for other malicious payloads.

Heuristics 5

  • Excel 4.0 macro sheet (3 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 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
  • 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://feedbackdownload.today/44389,7571259259.jpg
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
ce3b78405257ea5374a0faa3cde9f6cc12042c699ad21956c13a3f7bb60a8833		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1110 bytes
xlm_sheet_01.xml
989f17e30085fd1692e3b77bb5cf92f7e8f334c5a32a413e6b1343dcffe82e18		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1486 bytes
xlm_sheet_02.xml
684f6da319df36c5519b995abe343678bc33c6a88226ba5f477a9e49024c7d96		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 1299 bytes

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