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

Static analysis result for SHA-256 571cde96df8b8974…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 710f6d9d4c521a9ee8df07d6efc07b14 SHA-1: 67cbc117ce1e4524c7b794fc67e70c25fc3acba5 SHA-256: 571cde96df8b8974e420940d650b99a8b7b5cafb71513597de6ccc3ea907cc8d
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 macro sheet containing an Auto_Open macro, which is designed to execute automatically when the workbook is opened. The document body and extracted URLs indicate an attempt to trick the user into enabling macros, likely to download and execute a second-stage payload from one of the provided URLs. The presence of an Auto_Open defined name and the 'SE_ENABLE_LURE' heuristic strongly suggest this malicious intent.

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