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

Static analysis result for SHA-256 c3920267da7bab58…

MALICIOUS

Office (OLE) / .XLS

260.0 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: d60c2f2ee45ef20465d90b43cbd9f6df SHA-1: 1e62ba3df491b02edd107b5fa93884aefb63ad29 SHA-256: c3920267da7bab58ccf96ac29e88167f5c79b8e223c751caaf029c66b7e55e0c
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for legacy Excel malware. The DOC BODY and script artifacts reveal strings like 'XL4Poppy', 'Classic.Poppy by VicodinES', and '(C) The Narkotic Network 1998', suggesting a known legacy Excel macro virus family. The presence of Auto_Open with dangerous functions like RUN indicates an intent to execute arbitrary code, likely to download and run a second-stage payload. The contact information within the document body also suggests a phishing or social engineering lure.

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.
  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
2579e84e99fee4c2fbba727a0c187bb2649ce8ce74463472200493477cc2438f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 29268 bytes
macros.bas
90747e995c9fc44e3416f044699208efa4905d9ebc27d0e880708f4906c01d74		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2106 bytes

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