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

Static analysis result for SHA-256 a31570bc707b5290…

MALICIOUS

Office (OLE) / .XLS

122.5 KB Created: 2010-07-16 04:44:58 Authoring application: Microsoft Excel
MD5: 79f7c851b6f042d743e3b4027ef52f85 SHA-1: 23568c5314483cc75695d3b55e7158cce3edc65e SHA-256: a31570bc707b5290f717258c58542c08e1670d6aec6871082e056a9b09f459a0
200 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a known technique for executing malicious code upon opening the document. The macro sheet contains references to 'Poppy' and 'Narkotic Network', suggesting a legacy macro virus. The document body contains strings related to this malware, such as 'HlDBGrid Data' and 'XL4Poppy'. The XLM macros are designed to execute dangerous functions, including 'RUN', indicating a payload execution attempt.

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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
233a44e83b1b22a7e5c9b312e51cfe1e53c8833a424a349588c35d3a4068425d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9934 bytes

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