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

Static analysis result for SHA-256 989e829731d55da1…

MALICIOUS

Office (OLE) / .XLSX

153.0 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: 26f124898bf4a54f4c110bb58b3f38c4 SHA-1: a3eaad9a0cb49e8e12678c9e82d93e53d7d38008 SHA-256: 989e829731d55da1c9f0afdcebd1de9df19bfa1ff8935cee7b0eb8f1b5378fc5
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.004 Python

The sample is an Excel 4.0 macro-enabled document. It contains a fake decryption prompt instructing the user to enable content. The presence of `URLDownloadToFile` and `ShellExecute` heuristics, along with embedded URLs pointing to DLL files, indicates that the macro is designed to download and execute a second-stage payload. The document body text explicitly guides the user through a process that involves enabling macros for 'decryption', which is a common social engineering tactic.

Heuristics 5

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • OLE metadata lists many Excel 4.0 macro sheets medium OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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://wmwifbajxxbcxmucxmlc.com/files/april24.dll~
    • https://rnollg.com/kev/scfrd.dll$8
    • http://wmwifbajxxbcxmucxmlc.com/files/april24.dll

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