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

Static analysis result for SHA-256 cb3d06c0f98b88b9…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: d2e0757b5446eeac09acf6f13d1ade29 SHA-1: 27c85e159e9f27192c6b71a6282b33a8291c6adf SHA-256: cb3d06c0f98b88b948a6b41a166fe8c817d3ad892db92ed3f4a0dc69a9c42be9
102 Risk Score

Malware Insights

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

The critical OLE_XLM_AUTOOPEN heuristic indicates the presence of Excel 4.0 macros with an Auto_Open entry, which are designed to execute automatically upon opening the workbook. The SE_ENABLE_LURE heuristic confirms that the document attempts to trick the user into enabling macros. The extracted URLs and the embedded script fragments suggest that the macros are intended to download and execute a second-stage payload. The specific macro commands like 'CALL', 'RUN', 'LOADTEXT', and 'DOWNLOADFILE' further support this conclusion.

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://thedeformo.com/zrbLAqMKy21Y/lena.html
    • https://faithfulroofingco.com/nmsY1dCNaBRO/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
13ea4a1fd330f9266fa91027043baa61f334e3ac691e10ce14b7c7fee97c551c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8812 bytes

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