Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 37dff80775b38c06…

MALICIOUS

Office (OLE)

68.0 KB Created: 2011-08-19 07:25:25 First seen: 2019-01-12
MD5: d1e0779e379e708a59f2e9cd7244055a SHA-1: 1dd762957309ff96c7e94488ddd1cdba448750bb SHA-256: 37dff80775b38c06a5b17654fdcad69300acd35fcfe452d1ee290a86fe6c1475
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, indicated by multiple critical heuristic firings including OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. These macros utilize dangerous functions such as RUN, suggesting an intent to execute arbitrary code. The presence of markers like 'Poppy by VicodinES' and 'Narkotic Network' points to a known legacy macro virus, but the specific payload or download mechanism is not directly evident from the provided script fragments.

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 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 55534 bytes
SHA-256: 13d6a90358281eed84739d12c7dbcc1b2aaf8dea14f9f08750c2e1018773efd5
Preview script
First 1,000 lines of the extracted script
' 0085     12 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  l
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  XL4Popp
' 0018     24 LABEL : Cell Value, String Constant - aa len=7 ptgRef3d 4!C39 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 2 Auto_Close len=7 ptgRef3d 5!C4 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d 5!C4 
' 0018     26 LABEL : Cell Value, String Constant - Bust len=7 ptgRef3d 5!C31 
' 0018     30 LABEL : Cell Value, String Constant - Continue len=7 ptgRef3d 5!C9 
' 0018    107 LABEL : Cell Value, String Constant - Document_array len=8 ptgArrayA  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x01\x00\x00\xe0\xf7\x1b\x01'
' 0018     41 LABEL : Cell Value, String Constant - Documents_array len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x05\x00\x00\x00\x0f\x00\x01\x00\x01\x00'
' 0018     27 LABEL : Cell Value, String Constant - Hello len=7 ptgRef3d 5!A15 
' 0018     28 LABEL : Cell Value, String Constant - MakeIt len=7 ptgRef3d 5!A26 
' 0018     29 LABEL : Cell Value, String Constant - Morning len=7 ptgRef3d 5!C39 
' 0018     27 LABEL : Cell Value, String Constant - Poppy len=7 ptgRef3d 5!C27 
' 0018     27 LABEL : Cell Value, String Constant - built-in-name 6 ? len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x00\x00R\x00\x00\x00\t\x00'
' 0018     27 LABEL : Cell Value, String Constant - built-in-name 6 ? len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x01\x00\x01\x00&\x00\x00\x00\x03\x00'
' 0018     39 LABEL : Cell Value, String Constant - Print_Area_MI len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x02\x00\x00\x00[\x00\x00\x00\r\x00'
' 0018     24 LABEL : Cell Value, String Constant -   len=7 ptgSub *UNKNOWN TOKEN* 0x00c8 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b"<\x03\x00''"
' 0018     34 LABEL : Cell Value, String Constant -  üÈÝЬ len=7 *UNKNOWN TOKEN* 0x00c0 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xc5\xc5\xf8\xbc\x80\xbd'
' 0018     34 LABEL : Cell Value, String Constant -   Ìl­¬ len=7 *UNKNOWN TOKEN* 0x00c0 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xc5\xc5\xf8\xbc\x80\xbd'
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Valu
... (truncated)

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