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

Static analysis result for SHA-256 6617f5db5f91158e…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: ffbc625c0fb003f139c867a30d17785c SHA-1: ab7811837313793e25b544132f55d7c4dc812ed4 SHA-256: 6617f5db5f91158eab6e71dcbf0cd7c9419d28106064e1b2ffeb971da3458433
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel file containing Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The document body contains a lure to enable macros, and the extracted macro code indicates it attempts to download and execute a second-stage payload from the provided URLs. The macro also contains calls to 'rundll32.exe' with 'Server.dll' and 'RegisterServer', suggesting an attempt to execute or register a malicious component.

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://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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