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

Static analysis result for SHA-256 4e2f37d4228e78fa…

MALICIOUS

Office (OLE) / .XLS

43.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e758a4b1340fd50274edefd581cd8c52 SHA-1: 945f507232ddbe940e09ac69a4e8592aa55590ed SHA-256: 4e2f37d4228e78faa1f34121ee934f58e1a9862ad6f183edf4c24e08cda20363
162 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that uses the RUN function, indicating it attempts to execute external code. The macro also references a URL, 'supyouryoga.com/svgqcnjto/', which is likely used to download and execute a second-stage payload. The presence of 'DllRegisterServer' in the document body further suggests an attempt to register a malicious DLL.

Heuristics 5

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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 http://,DllRegisterServer

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
308f65a7e24d8de2adb3896a4c8f17431640fff8a783701177d7d1c8110b10b7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2209 bytes

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