IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 73f94d7cd9a33cbf…

MALICIOUS

Office (OOXML)

186.6 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9464b398d41c004f5d17debbee665007 SHA-1: 0893007a1eca2ed3daae182ce9b7fcdc003ed790 SHA-256: 73f94d7cd9a33cbfdc7a431feb39272e402d6aec9fca3956dae576a155442f44
242 Risk Score

Malware Insights

IcedID · confidence 95%

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

The file contains critical heuristics indicating the presence of Excel 4.0 macros, specifically using dangerous formula APIs like CALL and EXEC. These macros are designed to download a file named 'ALBATROS.dll' from 'http://feedbackdownload.download/44389,7571259259.jpg' and then execute it using 'regsvr32'. This behavior is characteristic of the IcedID malware family, which often uses macro-enabled documents as a delivery mechanism.

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.download/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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