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

Static analysis result for SHA-256 a9c1f298fb91e42f…

MALICIOUS

Office (OLE) / .XLS

73.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a4be6bdd314561c93f6b35753fba3a77 SHA-1: 05acf86186e358033405672c38344a93307a0dc3 SHA-256: a9c1f298fb91e42f87dff2378a87b0e3fe5a2bbf5f2ccca23335962995b28ae4
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel 4.0 spreadsheet containing an Auto_Open macro that uses dangerous functions, specifically the RUN function. The document body contains text that appears to be a lure to enable macros or editing. The macro likely attempts to download and execute a second-stage payload from the embedded URLs, such as http://rangtreem.net/hhxjx/Dm. The presence of XLM macros and the use of functions like CreateDirectoryA and DownloadToFileA are indicative of a downloader or droppper.

Heuristics 5

  • 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.
  • 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
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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://rangtreem.net/hhxjx/Dm
    • http://rangtreem.net/hhxjx/530340.png

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
038765af881bca0884d384b9f90840b3c03204e3b3356dc4f46858202e377efd		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3651 bytes
macros.bas
6482afb86d2ec7f1f8e6e88f38c92a22a2ebc9e6374d8b382d22d7c86011f736		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3253 bytes

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