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

Static analysis result for SHA-256 82ce0840f6bf385e…

MALICIOUS

Office (OLE) / .XLSX

58.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: e114f00d749be87f3a53e7de6f535023 SHA-1: 68bfd38601986aa68bb2ff287b261427336dbc63 SHA-256: 82ce0840f6bf385e2937c8fcc4adfd8a1877c1e3581f2a719580a5c059050b1d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The macros utilize dangerous functions and are designed to prompt the user to enable them, a common lure. The script attempts to download a payload from the URL 'www.psicheaurora.it/fanta/download.php', indicating it acts as a downloader.

Heuristics 4

  • 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f4049687de69fbae7a0009d349264e905f03c629c5b7f7eb1990c6538d126bea
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2738 bytes