Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cc2bfbd16ddf03ef…

MALICIOUS

Office (OLE)

150.5 KB Created: 2002-02-15 11:31:25
MD5: 4bc8352ccbc0161452717fa73ba122a4 SHA-1: 963802e071152b4a9d01ed04bdd542bf8e1f8bfc SHA-256: cc2bfbd16ddf03efdd0126474c0c5190e2540b3b0d05dc9903a84ed44447706f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains critical heuristic firings indicating the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. The macros utilize dangerous formula APIs such as RUN, which is commonly used to execute arbitrary commands. The presence of markers like 'Poppy by VicodinES' and 'Narkotic Network' suggests a known legacy macro virus. The document body appears to be a list of names and classes, likely a lure.

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
8c29b6acef931888911e52c71212937d771c5692d4539d85e4397cadbf34bcf4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 444753 bytes

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