Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 b33f04a970eb4f61…

MALICIOUS

Office (OLE) / .XLSX

329.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2365ac4f8db6a4b01d8c2e0336d85a4c SHA-1: 4e0c943331f3163dadb05f8fb623143244c513de SHA-256: b33f04a970eb4f61e6a2a5c18bc22d084fc59867ef3ec2278cfb3c3638ffa929
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes the ShellExecute API. This indicates an attempt to download and execute a secondary payload, as suggested by the embedded URL and the ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0'. The macro's functionality points towards a downloader attack pattern.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://cargohl.com/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
de64c8aedb9841e9622ce89b4c2a59532a2613bac9a0b05117fd5443ba276b2f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7888 bytes

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