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

Static analysis result for SHA-256 911a16f51d84c0bc…

MALICIOUS

Office (OLE) / .XLS

32.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d4936c46bfe3fd977d86e5ddf4e56b08 SHA-1: de9ba6f50dfe2761e1c9892126dbaf62f832e398 SHA-256: 911a16f51d84c0bce28e0344d252a9e19af21e8b701a46083def7eb07753b29f
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. This macro utilizes dangerous functions, specifically RUN, indicating an attempt to execute external code. The embedded URL likely serves as the source for this payload. The presence of a macro-enable lure further supports the malicious intent.

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://188.127.224.100/%f%

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
2be15c634779cf2b3e1484f4136edc55a719f6036cc7272362139fc35b4cd6f1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 747 bytes
macros.bas
6ef16962a7d1736287e80a5790fa109ca5c76acb8ae2190be54273430dbfbedb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 371 bytes

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