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

Static analysis result for SHA-256 ca8f4e238cff0423…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6b8fbbb9d661681f6fffd17732d570b9 SHA-1: 656d4b1b58dcee9354d9d2eff0090a7d62200051 SHA-256: ca8f4e238cff0423300b32ddf4219e3db20bcc4840df40bd526dc65f6de0a472
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Control T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an Excel 4.0 spreadsheet containing an Auto_Open macro, a known technique for executing malicious code upon opening. The macro likely attempts to download a payload from one of the two provided URLs: https://signifysystem.com/ceg7AX7oN0o/ue.html or https://fcventasyservicios.cl/k60jvjcT/ue.html. The document body also contains these URLs, further indicating their malicious intent. The presence of an 'enable lure' heuristic suggests the document is designed to trick the user into enabling macros.

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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