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

Static analysis result for SHA-256 92a6503b340521bd…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 85186ba8bbc4ca6dffce1e4137e995bd SHA-1: 3038c6a182a01f46342af747c9c6681eeb369a38 SHA-256: 92a6503b340521bd5b08d6783b47b269b36cbb5794929ae5c110f1db2b780fc9
102 Risk Score

Malware Insights

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

The critical OLE_XLM_AUTOOPEN_DEFINEDNAME heuristic indicates the presence of an Excel 4.0 Auto_Open macro, which is designed to execute automatically upon opening the workbook. The SE_ENABLE_LURE heuristic suggests the document prompts the user to enable macros, a common social engineering tactic. The embedded URLs likely serve as download locations for further payloads. The XLM macro sheet itself is the primary mechanism for executing the initial malicious 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 — 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://caiogabriel.com.br/tOKLlSLW/lena.html
    • https://bwctradex.com/BcotoLXTr1y/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d46ad6b52df62d280ddc3eb28f4fdfc78bc84dc99077b9aa50809affc4be6057		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8812 bytes

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