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

Static analysis result for SHA-256 d606356ddfafc510…

MALICIOUS

Office (OLE) / .XLS

323.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1c4745f85b03712776a075eed8148fab SHA-1: 005fb38666312f473658a94f5e9731377aff6d0b SHA-256: d606356ddfafc5101226b384ed8e400c02b7896e2b1cbd2614ef440b30b14fd4
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains both Excel 4.0 macros and VBA code. The VBA macro explicitly uses URLDownloadToFile to download a file from the reconstructed URL "http://elixerdigitall.com/ds/1412.gif". The Excel 4.0 macro sheet contains an Auto_Open entry that likely triggers the VBA code. The presence of URLDownloadToFile and the Auto_Open entry strongly indicate a downloader functionality.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
276c953107c4011604d8d160db2a3763151b63e39affd68981ced6ad05de376c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1932 bytes
macros.bas
8a3abe914a955e548e3a1866c2dfff305e581d06c3b2758caa9cf8039c81fafc		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1763 bytes

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