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

Static analysis result for SHA-256 31711bc429436866…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 38442881171ee823183b46be99a58e4c SHA-1: 4388667b253b0953a67f6a09767ba0c1e55c056b SHA-256: 31711bc429436866bb2acba4d3f7a7cc1a2f110ef8338eb45bad1dcb560254bb
102 Risk Score

Malware Insights

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

The critical heuristic OLE_XLM_AUTOOPEN_DEFINEDNAME indicates the presence of an Excel 4.0 Auto_Open macro. The SE_ENABLE_LURE heuristic suggests the document prompts the user to enable content. The embedded URLs likely serve as download locations for a second-stage payload, as suggested by the presence of functions like 'downloadFile' and 'runDll' within the macro code. The macro's intent is to execute arbitrary code by calling external DLL functions.

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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