Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 88ae975f4e74736a…

MALICIOUS

Office (OOXML) / .XLSM

416.5 KB Created: 2021-03-08 05:51:46 UTC Authoring application: Microsoft Excel 16.0300
MD5: b5ccbececf177765cf326f65d0ca232e SHA-1: 179fff5189d833d805f4cfa8edd24fb7320a621b SHA-256: 88ae975f4e74736af2a5a9afdb5fa9cdac99f6040495fa9b41b15116ca038edc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLSM file contains a Workbook_Open macro that utilizes the Shell() function, a critical indicator of malicious activity. The ClamAV detection name 'Xls.Downloader.DridexGreen09213-9890103-0' strongly suggests a downloader family, likely Dridex. The macro's purpose is to execute commands, which is a common technique for downloading and running further malicious payloads. No specific URLs or hashes were extracted, but the presence of the macro and the ClamAV signature are sufficient for a high-confidence assessment.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a89c7c0994a521b89f7bd472d57b3654036d1a1893f54d8bdbbc4a98569c9f6d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 39531 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
913755f08ee4d1f3c2e0071db8f8bd53e0fc636f12c161ea82d76df1fc4a0d20		 vba-project OOXML VBA project: xl/vbaProject.bin 44544 bytes

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