Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dc05ec105f2fa2d6…

MALICIOUS

Office (OLE)

27.5 KB Created: 2010-05-09 08:37:37 Authoring application: Microsoft Excel
MD5: 1f822f575509c4540c7359354a13d129 SHA-1: 255d5ea370887564f01769b7e71351fa2ccb2f08 SHA-256: dc05ec105f2fa2d6830ccf3a34d97c4020c68cc501fc8dee169f926b8c8f9fb0
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1547.001 Registry Run Keys / Startup Folder

The file contains critical heuristics indicating it is a legacy Excel 4.0 macro virus, specifically identified as 'XF.Classic' and 'Poppy'. The macro sheet contains an Auto_Open entry which is designed to execute automatically. The embedded document body and script fragments suggest the macro's intent is to infect other Excel workbooks, potentially including the startup folder, and deliver a payload, as indicated by references to 'Hydrocodone/APAP' and 'The Narkotic Network'.

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
518fb65ce657467765ba68a3c03ab666b8cdf9b225ca91f38805e62cfafc0bde		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9474 bytes

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