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

Static analysis result for SHA-256 edf8b59767f30d39…

MALICIOUS

Office (OLE) / .XLSX

88.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 154c724e8d22717a5afba1d10833f379 SHA-1: 11fdadd9f2435ab35b7cb16720ecf8acf0b3a91d SHA-256: edf8b59767f30d39e661e3c2274fb6425038a8d59feaa47c4136e93fc6a10f53
80 Risk Score

Malware Insights

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

The sample contains an Excel 4.0 macro (XLM) that is triggered by the Auto_Open function. This macro is designed to bypass security by instructing the user to enable macros. Once enabled, it uses dangerous formula APIs, including RUN, to execute code that downloads a payload from one of the embedded URLs. The presence of the XLM macro and the lure to enable content are strong indicators of a downloader.

Heuristics 4

  • 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
  • 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://ishikapress.com/ds/1802.Dc
    • https://ishikapress.com/ds/1802.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c4464f55539beeb916b93dcbdeb44c6abc9c420b18c530455f35b639c5876ac0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3263 bytes

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