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

Static analysis result for SHA-256 f5a2c20518b248fb…

MALICIOUS

Office (OLE) / .XLS

367.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a83cfa94ec443335c4339317c6976ce0 SHA-1: 945df4ba2ae13005fd8d850920d9a72d802a820f SHA-256: f5a2c20518b248fb4e9796ea94878dcde321130955d36a2f8f9e28111a024af8
102 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for automatic execution upon opening. The presence of a 'Macro/content-enable lure' heuristic indicates the document likely prompts the user to enable macros. The extracted URLs are likely used to download a second-stage payload. Confidence is high due to the clear presence of auto-execution macros and lure techniques.

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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL https://silvertoncc.com/ys1Btp80hx/th.html
    • https://christleadersworld.com/1TaIPHnbwbNV/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
740337535414e50f998f7a71055f9de0e2208abc42faca490883ba1d9c48deb1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8349 bytes

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