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

Static analysis result for SHA-256 f885fd94f02681a4…

MALICIOUS

Office (OLE) / .XLS

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 047f919172d5a977112a5ef2ce95d6d1 SHA-1: 7f01e96aa9f5eb06ea6a42f70d9906cdc805ecc0 SHA-256: f885fd94f02681a47b33316fa6f5e8ca11c94653b81d4769a019efe0b6a1e8b7
100 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and ShellExecute. This indicates the macro is designed to execute arbitrary code. The presence of an embedded URL suggests a downloader functionality, aiming to retrieve and execute a second-stage payload. The confidence is high due to the direct evidence of macro execution capabilities and a clear indicator of a download source.

Heuristics 4

  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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.
  • 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 https://birdexim.com/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b9e922997ab1008b6d5ca8df5e57db733535c15f4d8d4ecbbf5827b941f024c9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6069 bytes

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