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

Static analysis result for SHA-256 3a5e00d2dd78e593…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 06605178d9dc0052e048cd8771f5bfe1 SHA-1: 07b5d7e89214cf745378bc6f7646fbb1f4c09dce SHA-256: 3a5e00d2dd78e59309453c784f1f24e4f6764d8afe36640a5763cd1872e3aaf0
102 Risk Score

Malware Insights

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

The sample is an Excel 4.0 spreadsheet containing an Auto_Open macro, a known technique for executing malicious code upon opening. The document body and extracted URLs indicate a lure to download a second-stage payload from either signifysystem.com or fcventasyservicios.cl. The presence of the Auto_Open macro and the lure strongly suggest a downloader or initial access payload.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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://signifysystem.com/ceg7AX7oN0o/ue.html
    • https://fcventasyservicios.cl/k60jvjcT/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c7d4d2bead8580d5104e88300cefa6eb3ebffd421d1191db8449676bfb792ff2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes

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