IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 6ddd95ce6eab2c67…

MALICIOUS

Office (OOXML)

184.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: f28be85af86bcb243a4a0a2210830757 SHA-1: cd6bab293b7353d240081f4003841df0e92b967d SHA-256: 6ddd95ce6eab2c675873a027165cfa8534638e7d3177e976ee31f48ebd3bc656
242 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros that utilize dangerous functions like CALL, EXEC, and FORMULA to download a DLL from 'http://fourstars.cyou/1.php' and then execute it using 'regsvr32 -silent "..\91919.dll"'. This behavior is characteristic of IcedID downloaders, which often use macro-enabled documents to fetch and run their primary payload.

Heuristics 5

  • Excel 4.0 macro sheet (2 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://fourstars.cyou/1.php
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
d3df3d0996b09806e232547bf408659955ac33ea252003ebc11e0fb5e8bd0cc5		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1252 bytes
xlm_sheet_01.xml
dcf92c20099b47309d75331e9c53f83a546133e74ba138dee92517f465b268e3		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1408 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.