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

Static analysis result for SHA-256 ab91c8ffcea56b18…

MALICIOUS

Office (OLE) / .XLS

434.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: cc3546639138a10d8aa56d676d8c64dd SHA-1: 9d9d5272585f8a0770c781565af806ef0a513e5e SHA-256: ab91c8ffcea56b18427ad5684ed176d8e910a375741d19e6592fcdbbfeca812a
200 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 Unix Shell

The sample contains Excel 4.0 (XLM) and VBA macros, with a Workbook_Open macro specifically detected. The presence of ShellExecute and URLDownloadToFile API calls indicates an attempt to download and execute external content. The document body includes a URL, http://click2search.in/crun20.gif, which is marked as unknown reputation and likely serves as the download source for a second-stage payload. The 'Macro/content-enable lure' heuristic further supports that the document's primary purpose is to trick the user into enabling macros to initiate this malicious download process.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
  • 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
  • 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://click2search.in/crun20.gif�
    • http://click2search.in/crun20.gif
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
11bfa8d92387ecf328faef5f79f106108f6f27d19809be585d9bf0b7c16ba3b5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8558 bytes
macros.bas
37db320dd2f08ca151ba0eed72f38995b07629a8d58f18c64d048ecb72b105a8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1282 bytes

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